Air conditioning system and control method, device, storage medium and program product thereof

Abstract

This invention discloses an air conditioning system and its control method, device, storage medium, and computer program product. The air conditioning system has a sealed housing surrounding the fan coil unit, and return air inlet valves, outlet air inlet valves, and mixing air inlet valves are correspondingly installed at the return air inlet, outlet air inlet, and mixing air inlet. The method includes: after startup, controlling the air conditioning system to operate at a target temperature and humidity for an initial set time; based on at least one of the indoor relative humidity, the area of ​​the low-temperature surface of the condensate drain pan, and the motor temperature, controlling the opening and closing of the return air inlet valve, outlet air inlet valve, and mixing air inlet valve, and / or controlling the fan speed. This solution, by controlling the fan coil unit to operate in at least one of the following modes—external circulation mode, proportional mixing mode, and internal circulation mode—based on the indoor relative humidity, the area of ​​the low-temperature surface of the condensate drain pan, and the motor temperature, and controlling the fan speed, adjusts for consistency differences in the fan coil unit across different regions, thereby improving the operating performance of the air conditioning system.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning system technology, specifically relating to a control method, device, air conditioning system, storage medium, and computer program product for an air conditioning system, and particularly to a composite regulation and control method, device, air conditioning system, storage medium, and computer program product based on a box-type fan coil unit in an air conditioning system. Background Technology

[0002] Fan coil units, also known as fan coil units, are terminal products in air conditioning systems (such as commercial air conditioning systems) used to regulate indoor environmental comfort (such as temperature and humidity comfort) and are widely used in commercial buildings. However, due to differences in temperature and humidity in different regions, the consistency of fan coil units varies from place to place, affecting the operating performance of the air conditioning system.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The purpose of this invention is to provide a control method, device, air conditioning system, storage medium, and computer program product for an air conditioning system. This addresses the problem that variations in the temperature and humidity of the fan coil unit in different regions affect the system's performance, thus impacting its consistency. The invention achieves this by controlling the fan coil unit's operation in at least one of three modes—external circulation, proportional mixing, and internal circulation—based on the relative humidity of the indoor environment, the area of ​​the low-temperature surface of the condensate tray, and the motor temperature. It also controls the fan speed to prevent condensation on the condensate tray and adjusts the motor's operating conditions, thereby mitigating the consistency differences in the fan coil unit across different regions and improving the overall performance of the air conditioning system.

[0005] This invention provides a control method for an air conditioning system. The air conditioning system has a fan coil unit with a closed housing surrounding it. The fan coil unit includes a fan, a condensate tray, a motor, a return air inlet, an outlet air outlet, and a mixing air outlet. A return air inlet valve is provided at the return air inlet, an outlet air outlet valve is provided at the outlet air outlet, and a mixing air outlet valve is provided at the mixing air outlet. The control method for the air conditioning system includes: after the air conditioning system is turned on, controlling the air conditioning system to operate at a target temperature and humidity for an initial set time; acquiring the indoor relative humidity of the air conditioning system, acquiring the area of ​​the low-temperature surface of the condensate tray, and acquiring the temperature of the motor; and controlling the opening and closing of the return air inlet valve, the outlet air outlet valve, and the mixing air outlet valve, as well as the opening degree when opening, and / or controlling the rotational speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the condensate tray, and the temperature of the motor.

[0006] In some embodiments, when the return air inlet valve is fully open, the outlet air valve is fully open, and the mixing air inlet valve is closed, the fan coil unit operates in a preset external circulation air supply mode; when the return air inlet valve is fully open, the outlet air valve is fully open, and the mixing air inlet valve is opened according to the required mixing ratio, the fan coil unit operates in a preset proportional mixing air supply mode; when the return air inlet valve is closed, the outlet air valve is fully open, and the mixing air inlet valve is fully open, the fan coil unit operates in a preset internal circulation air supply mode.

[0007] In some embodiments, the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or the speed of the fan are controlled based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. This includes: determining whether the temperature of the motor is greater than or equal to the maximum allowable temperature of the motor; if the temperature of the motor is determined to be greater than or equal to the maximum allowable temperature of the motor, then controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open. The system operates the fan coil unit in a preset internal circulation mode for a first set time. It then determines whether the motor temperature is less than or equal to the motor's normal temperature threshold. If the motor temperature is less than or equal to the motor's normal temperature threshold, the system returns to its previous state to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time. If the motor temperature is greater than the motor's normal temperature threshold, the system returns to its previous state to continue controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation mode.

[0008] In some embodiments, the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree, and / or the rotational speed of the fan are controlled based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water tray, and the temperature of the motor. The method further includes: if the temperature of the motor is determined to be less than the maximum allowable temperature of the motor, determining whether the indoor relative humidity of the air conditioning system is within a set humidity range; if the indoor relative humidity of the air conditioning system is determined to be within the set humidity range, then controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree, to cause the fan coil unit to operate in a preset proportional mixing air supply mode for a second set time.

[0009] In some embodiments, setting a humidity range includes: a first interval, a second interval, and a third interval where the humidity values ​​increase sequentially; controlling the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset proportional air mixing mode for a second preset time, includes: determining the interval to which the indoor relative humidity of the air conditioning system belongs within the set humidity range; if the indoor relative humidity of the air conditioning system is determined to be within the first interval, then controlling the opening degree of the mixing air vent valve to a first preset opening degree, so that the fan coil unit operates in a preset proportional air mixing mode for a second preset time; if the indoor relative humidity of the air conditioning system is determined to be within the second interval, then controlling the opening degree of the mixing air vent valve to a second preset opening degree, so that the fan coil unit operates in a preset proportional air mixing mode for a second preset time; if the indoor relative humidity of the air conditioning system is determined to be within the third interval, then controlling the opening degree of the mixing air vent valve to a third preset opening degree, so that the fan coil unit operates in a preset proportional air mixing mode for a second preset time.

[0010] In some embodiments, the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or the rotational speed of the fan are controlled based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. The method further includes: if it is determined that the temperature of the motor is less than the maximum allowable temperature of the motor, and it is determined that the indoor relative humidity of the air conditioning system is not within the set humidity range, determining whether the indoor relative humidity of the air conditioning system is less than or equal to the lower limit of the set humidity range, and determining the indoor relative humidity of the air conditioning system... If the relative humidity of the air conditioning system is determined to be greater than or equal to the upper limit of the set humidity range, then the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as the opening degree when they are opened, are controlled so that the fan coil unit operates in the preset internal circulation air supply mode for a third set time. If the relative humidity of the air conditioning system is determined to be less than or equal to the lower limit of the set humidity range, then the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as the opening degree when they are opened, are controlled so that the fan coil unit operates in the preset external circulation air supply mode for a fourth set time.

[0011] In some embodiments, the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree, and / or the fan speed are controlled based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. This further includes: after controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree, to make the fan coil unit operate in a preset proportional mixing air supply mode for a second set time, determining the rate of change of the area of ​​the low-temperature surface of the drip tray within a set detection period based on the area of ​​the low-temperature surface of the drip tray, and recording this as the rate of change of the area of ​​the low-temperature surface of the drip tray; and determining whether the area of ​​the low-temperature surface of the drip tray is less than a first... The system sets an area; if the area of ​​the low-temperature surface of the water collection tray is determined to be greater than or equal to a first set area, the system controls the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode, and the fan operates at the preset lowest speed for a first set time; if the area of ​​the low-temperature surface of the water collection tray is determined to be less than or equal to a first set change rate, the system determines whether the area change rate of the low-temperature surface of the water collection tray is less than or equal to a first set change rate; if the area change rate of the low-temperature surface of the water collection tray is determined to be less than or equal to a first set change rate, the system controls the air conditioning system to maintain the current operating state for a second set time, and then returns to control the air conditioning system to operate at the target temperature and humidity for the initial set time.

[0012] In some embodiments, the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree when open, and / or the rotational speed of the fan are controlled based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. This further includes: recording the area of ​​the low-temperature surface of the drip tray obtained in the current detection cycle as the current value of the low-temperature surface area of ​​the drip tray; recording the area of ​​the low-temperature surface of the drip tray obtained in the previous detection cycle as the previous value of the low-temperature surface area of ​​the drip tray; if it is determined that the rate of change of the area of ​​the low-temperature surface of the drip tray is greater than a first set rate of change, then determining whether the current value of the area of ​​the low-temperature surface of the drip tray is less than the previous value of the low-temperature surface area of ​​the drip tray; if it is determined that the current value of the area of ​​the low-temperature surface of the drip tray is less than the previous value of the low-temperature surface area of ​​the drip tray, then controlling the... The fan speed is reduced to a preset level for a second set time, then returns to the preset level to restart the air conditioning system at the target temperature and humidity for the initial set time; or the opening of the mixing vent valve is reduced to a preset level to make the fan coil unit run in a preset proportional mixing air supply mode for a second set time, then returns to the preset level to restart the air conditioning system at the target temperature and humidity for the initial set time; if the current value of the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the previous value of the area of ​​the low-temperature surface of the water receiving tray, the fan speed is increased to a preset level for a second set time, then returns to the preset level to restart the air conditioning system at the target temperature and humidity for the initial set time; or the opening of the mixing vent valve is increased to a preset level to make the fan coil unit run in a preset proportional mixing air supply mode for a second set time, then returns to the preset level to restart the air conditioning system at the target temperature and humidity for the initial set time.

[0013] In some embodiments, the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as their opening degree, and / or the rotational speed of the fan are controlled based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. This further includes: after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as their opening degree, to make the fan coil unit operate in a preset internal circulation mode for a third set time; or, after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as their opening degree, to make the fan coil unit operate in a preset internal circulation mode and controlling the fan to operate at a preset lowest speed for a first set time, the rate of change of the area of ​​the low-temperature surface of the drip tray within a set detection period is determined based on the area of ​​the low-temperature surface of the drip tray, and recorded as the rate of change of the area of ​​the low-temperature surface of the drip tray; If the rate of change of the low-temperature surface of the water collection tray is less than or equal to the second set rate of change, then the fan speed is increased to a preset level for a fourth set time, and then the process returns to re-determine whether the rate of change of the low-temperature surface of the water collection tray is less than or equal to the second set rate of change; if the rate of change of the low-temperature surface of the water collection tray is greater than the second set rate of change, then the process returns to determine whether the area of ​​the low-temperature surface of the water collection tray is less than the second set area; if the area of ​​the low-temperature surface of the water collection tray is less than the second set area, then the process returns to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; if the area of ​​the low-temperature surface of the water collection tray is greater than or equal to the second set area, then the process returns to continue controlling the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode for a third set time.

[0014] In some embodiments, the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree, and / or the rotational speed of the fan are controlled based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water tray, and the temperature of the motor. This further includes: after controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree, to make the fan coil unit operate in a preset external circulation mode for a fourth set time, determining whether the area of ​​the low-temperature surface of the water tray is less than a first set area; if it is determined that the area of ​​the low-temperature surface of the water tray is less than the first set area, then returning to control the air conditioning system to operate at the target temperature and humidity for the initial set time; if it is determined that the area of ​​the low-temperature surface of the water tray is greater than or equal to the first set area, then continuing to control the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree, to make the fan coil unit operate in a preset internal circulation mode, and controlling the fan to operate at a preset lowest speed for a first set time.

[0015] In conjunction with the above method, another aspect of the present invention provides a control device for a fan coil unit. The air conditioning system has a fan coil unit with a closed housing surrounding it. The fan coil unit includes a fan, a water collection tray, a motor, a return air inlet, an air outlet, and a mixing air outlet. A return air inlet valve is provided at the return air inlet, an air outlet valve at the air outlet, and a mixing air outlet valve at the mixing air outlet. The control device for the air conditioning system includes: a control unit configured to control the air conditioning system to operate at a target temperature and humidity for an initial set time after the air conditioning system is turned on; an acquisition unit configured to acquire the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water collection tray, and the temperature of the motor; the control unit is further configured to control the opening and closing of the return air inlet valve, the air outlet valve, and the mixing air outlet valve, as well as the opening degree when open, and / or control the rotational speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water collection tray, and the temperature of the motor.

[0016] In some embodiments, when the return air inlet valve is fully open, the outlet air valve is fully open, and the mixing air inlet valve is closed, the fan coil unit operates in a preset external circulation air supply mode; when the return air inlet valve is fully open, the outlet air valve is fully open, and the mixing air inlet valve is opened according to the required mixing ratio, the fan coil unit operates in a preset proportional mixing air supply mode; when the return air inlet valve is closed, the outlet air valve is fully open, and the mixing air inlet valve is fully open, the fan coil unit operates in a preset internal circulation air supply mode.

[0017] In some embodiments, the control unit controls the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when open, and / or controls the fan speed, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. This includes: determining whether the temperature of the motor is greater than or equal to the maximum allowable temperature of the motor; if the temperature of the motor is determined to be greater than or equal to the maximum allowable temperature of the motor, then controlling the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when open. The opening degree is adjusted to allow the fan coil unit to operate in a preset internal circulation air supply mode for a first set time; it is determined whether the temperature of the motor is less than or equal to the normal temperature threshold of the motor; if the temperature of the motor is determined to be less than or equal to the normal temperature threshold of the motor, the process returns to the previous state to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; if the temperature of the motor is determined to be greater than the normal temperature threshold of the motor, the process returns to the previous state to continue controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode.

[0018] In some embodiments, the control unit controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water tray, and the temperature of the motor. The control unit further includes: if it is determined that the temperature of the motor is less than the maximum allowable temperature of the motor, determining whether the indoor relative humidity of the air conditioning system is within a set humidity range; if it is determined that the indoor relative humidity of the air conditioning system is within the set humidity range, then controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset proportional mixing air supply mode for a second set time.

[0019] In some embodiments, a humidity range is set, including a first interval, a second interval, and a third interval where the humidity values ​​increase sequentially. The control unit controls the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when they are open, so that the fan coil unit operates in a preset proportional air mixing mode for a second preset time. This includes: determining the interval to which the indoor relative humidity of the air conditioning system falls within the set humidity range; if the indoor relative humidity of the air conditioning system is determined to be within the first interval, then controlling the opening degree of the mixing air valve to a first preset opening degree, so that the fan coil unit operates in the preset proportional air mixing mode for a second preset time; if the indoor relative humidity of the air conditioning system is determined to be within the second interval, then controlling the opening degree of the mixing air valve to a second preset opening degree, so that the fan coil unit operates in the preset proportional air mixing mode for a second preset time; if the indoor relative humidity of the air conditioning system is determined to be within the third interval, then controlling the opening degree of the mixing air valve to a third preset opening degree, so that the fan coil unit operates in the preset proportional air mixing mode for a second preset time.

[0020] In some embodiments, the control unit controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or controls the fan speed, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. It further includes: if it is determined that the temperature of the motor is less than the maximum allowable temperature of the motor, and it is determined that the indoor relative humidity of the air conditioning system is not within the set humidity range, determining whether the indoor relative humidity of the air conditioning system is less than or equal to the lower limit of the set humidity range, and determining the indoor relative humidity of the air conditioning system... If the indoor relative humidity is greater than or equal to the upper limit of the set humidity range, then the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as their opening degree, are controlled to make the fan coil unit run in the preset internal circulation air supply mode for a third set time. If the indoor relative humidity is less than or equal to the lower limit of the set humidity range, then the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as their opening degree, are controlled to make the fan coil unit run in the preset external circulation air supply mode for a fourth set time.

[0021] In some embodiments, the control unit controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or controls the fan speed, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. The control unit further includes: after controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, to make the fan coil unit operate in a preset proportional mixing air supply mode for a second set time, determining the rate of change of the area of ​​the low-temperature surface of the drip tray within a set detection period based on the area of ​​the low-temperature surface of the drip tray, and recording it as the rate of change of the area of ​​the low-temperature surface of the drip tray; and determining whether the area of ​​the low-temperature surface of the drip tray is small. If the area of ​​the low-temperature surface of the water collection tray is greater than or equal to the first set area, the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, are controlled so that the fan coil unit operates in a preset internal circulation air supply mode, and the fan is controlled to run at the preset lowest speed for a first set time; if the area of ​​the low-temperature surface of the water collection tray is less than the first set area, the rate of change of the area of ​​the low-temperature surface of the water collection tray is determined to be less than or equal to the first set rate of change; if the rate of change of the area of ​​the low-temperature surface of the water collection tray is determined to be less than or equal to the first set rate of change, the air conditioning system is controlled to maintain the current operating state for a second set time, and then returns to control the air conditioning system to run at the target temperature and humidity for the initial set time.

[0022] In some embodiments, the control unit controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or controls the fan speed, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. The control unit further includes: recording the area of ​​the low-temperature surface of the drip tray obtained in the current detection cycle as the current value of the area of ​​the low-temperature surface of the drip tray; recording the area of ​​the low-temperature surface of the drip tray obtained in the previous detection cycle as the previous value of the area of ​​the low-temperature surface of the drip tray; if it is determined that the rate of change of the area of ​​the low-temperature surface of the drip tray is greater than a first preset rate of change, then determining whether the current value of the area of ​​the low-temperature surface of the drip tray is less than the previous value of the area of ​​the low-temperature surface of the drip tray; if it is determined that the current value of the area of ​​the low-temperature surface of the drip tray is less than the previous value of the area of ​​the low-temperature surface of the drip tray, then... The system can either control the fan speed to decrease to a preset level for a second set time, then return to the preset level to restart the air conditioning system at the target temperature and humidity for an initial set time; or control the opening of the mixing vent valve to decrease to a preset level, causing the fan coil unit to run in a preset proportional mixing air supply mode for a second set time, then return to the preset level to restart the air conditioning system at the target temperature and humidity for an initial set time; if the current value of the area of ​​the low-temperature surface of the water collection tray is greater than or equal to the previous value of the area of ​​the low-temperature surface of the water collection tray, the system can control the fan speed to increase to a preset level for a second set time, then return to the preset level to restart the air conditioning system at the target temperature and humidity for an initial set time; or control the opening of the mixing vent valve to increase to a preset level, causing the fan coil unit to run in a preset proportional mixing air supply mode for a second set time, then return to the preset level to restart the air conditioning system at the target temperature and humidity for an initial set time.

[0023] In some embodiments, the control unit controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree, and / or controls the fan speed, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the condensate tray, and the temperature of the motor. This further includes: after controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree, to make the fan coil unit operate in a preset internal circulation mode for a third set time; or, after controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as their opening degree, to make the fan coil unit operate in a preset internal circulation mode and controlling the fan to operate at a preset lowest speed for a first set time, determining the rate of change of the area of ​​the low-temperature surface of the condensate tray within a set detection period based on the area of ​​the low-temperature surface of the condensate tray, and recording this as the rate of change of the area of ​​the low-temperature surface of the condensate tray. The system determines whether the rate of change of the low-temperature surface area of ​​the water collection tray is less than or equal to a second set rate of change. If the rate of change of the low-temperature surface area of ​​the water collection tray is less than or equal to the second set rate of change, the fan speed is increased to a preset level and operated for a fourth set time. Then, the system returns to determine whether the rate of change of the low-temperature surface area of ​​the water collection tray is less than or equal to the second set rate of change. If the rate of change of the low-temperature surface area of ​​the water collection tray is greater than the second set rate of change, the system determines whether the area of ​​the low-temperature surface of the water collection tray is less than the second set area. If the area of ​​the low-temperature surface of the water collection tray is less than the second set area, the system returns to control the air conditioning system to operate at the target temperature and humidity for the initial set time. If the area of ​​the low-temperature surface of the water collection tray is greater than or equal to the second set area, the system returns to continue controlling the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode for a third set time.

[0024] In some embodiments, the control unit controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when they are open, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water tray, and the temperature of the motor. The control unit further includes: after controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when they are open, to make the fan coil unit operate in a preset external circulation air supply mode for a fourth set time, determining... If the area of ​​the low-temperature surface of the water collection tray is less than the first set area, then the system returns to the initial set time to re-control the air conditioning system to operate at the target temperature and humidity. If the area of ​​the low-temperature surface of the water collection tray is greater than or equal to the first set area, then the system continues to control the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode and the fan operates at the preset lowest speed for the first set time.

[0025] In conjunction with the above-mentioned device, the present invention further provides an air conditioning system, including: the control device for the fan coil unit described above.

[0026] In conjunction with the above method, the present invention further provides a storage medium comprising a stored program, wherein, when the program is executed, the device on which the storage medium is located executes the steps of the control method of the air conditioning system described above.

[0027] In conjunction with the above method, the present invention further provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method for the air conditioning system described above.

[0028] Therefore, the solution of the present invention, for an air conditioning system with a fan coil unit, involves setting a closed shell (such as an insulated shell 1) around the fan coil unit to form a box-type fan coil unit, setting a return air inlet valve (such as a first valve 51) at the return air inlet of the fan coil unit, setting an outlet air valve (such as a second valve 52) at the outlet air inlet of the fan coil unit, and setting a mixing air inlet valve (such as a third valve 53) at the mixing air inlet of the fan coil unit; after the air conditioning system is turned on and runs according to preset parameters for a period of time (such as time m0), the relative humidity of the indoor environment (such as real-time relative humidity) is considered. The system controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening ratio when they are open, based on the relative humidity of the indoor environment, the area of ​​the low-temperature surface of the water collection tray (such as the insulated water collection tray 7) (e.g., the area Si of the low-temperature surface of the insulated water collection tray 7), and the temperature of the motor of the fan in the air handling unit (e.g., the real-time temperature Ti). This allows the system to execute at least one of the following operating modes: external circulation mode, proportional mixing mode, and internal circulation mode, and to control the fan speed. Thus, by controlling at least one air supply mode of the air handling unit (external circulation mode, proportional mixing mode, and internal circulation mode) based on the relative humidity of the indoor environment, the area of ​​the low-temperature surface of the water collection tray, and the motor temperature, and controlling the fan speed, the system achieves anti-condensation control of the water collection tray and adjusts the operating conditions of the motor to address the consistency differences of the air handling unit in different regions, thereby improving the operating performance of the air conditioning system.

[0029] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0030] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0031] Figure 1 This is a flowchart illustrating an embodiment of the control method for an air conditioning system according to the present invention;

[0032] Figure 2 This is a schematic flowchart of an embodiment of the method of the present invention, which controls the return air valve, the outlet air valve, and the mixing air valve according to the temperature of the motor.

[0033] Figure 3 This is a schematic flowchart of an embodiment of the first process of controlling the return air vent valve, the outlet air valve, and the mixing air vent valve according to the indoor relative humidity of the air conditioning system in the method of the present invention.

[0034] Figure 4 This is a flowchart illustrating an embodiment of the method of the present invention, which involves running the fan coil unit in a preset proportional air mixing and supply mode for a second set time.

[0035] Figure 5 This is a schematic flowchart of an embodiment of the second process of controlling the return air vent valve, the outlet air valve, and the mixing air vent valve according to the indoor relative humidity of the air conditioning system in the method of the present invention;

[0036] Figure 6 This is a schematic flowchart of an embodiment of the first process of controlling at least one of the return air inlet valve, the outlet air valve, the mixing air inlet valve, and the fan speed according to the area of ​​the low-temperature surface of the water receiving tray in the method of the present invention.

[0037] Figure 7 This is a schematic flowchart of an embodiment of the second process of controlling at least one of the return air inlet valve, the outlet air valve, the mixing air inlet valve, and the fan speed according to the area of ​​the low-temperature surface of the water receiving tray in the method of the present invention.

[0038] Figure 8 This is a schematic flowchart of an embodiment of the third process in the method of the present invention, in which at least one of the return air valve, the outlet air valve, the mixing air valve and the fan speed is controlled according to the area of ​​the low temperature surface of the water receiving pan.

[0039] Figure 9 This is a schematic flowchart of an embodiment of the fourth process in the method of the present invention, in which at least one of the return air valve, the outlet air valve, the mixing air valve and the fan speed is controlled according to the area of ​​the low temperature surface of the water receiving pan.

[0040] Figure 10 This is a schematic diagram of the structure of an embodiment of the control device for the fan coil unit of the present invention;

[0041] Figure 11 This is a schematic diagram of the composite adjustment device for a box-type fan coil unit;

[0042] Figure 12 A schematic diagram of the external circulation mode airflow of a composite regulating device for a box-type fan coil unit;

[0043] Figure 13 A schematic diagram of the airflow in the mixed-air mode of a box-type fan coil unit.

[0044] Figure 14 A schematic diagram of the airflow in the internal circulation mode of a composite regulating device for a box-type fan coil unit;

[0045] Figure 15 This is a flowchart illustrating the composite adjustment and control method for box-type fan coil units.

[0046] Referring to the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0047] 1-Insulated shell; 2-Fan; 3-Motor; 4-Surface cooler assembly; 51-First air valve; 52-Second air valve; 53-Third air valve; 6-Air outlet; 7-Insulated drip tray; 81-Return air inlet temperature and humidity monitoring device; 82-Motor temperature monitoring device; 83-Drip tray temperature control surface monitoring device; 9-Return air inlet; 10-Mixed air inlet; 102-Acquisition unit; 104-Control unit. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0049] Considering the variations in temperature and humidity across different regions, the performance of air conditioning systems is affected by differences in the fan coil units, leading to inconsistencies in their performance across regions. Specifically, due to global climate variations, the lifespan, maintenance requirements, and material specifications of fan coil units vary considerably from region to region. This is especially true for core components such as motors and condensate trays, whose performance is further compromised in high-temperature and high-humidity environments, impacting the overall system performance. The condensate tray in the fan coil unit is external, unlike the internal condensate trays in conventional indoor units such as ducted air conditioners. External condensate trays offer greater reliability.

[0050] Therefore, the present invention proposes a control method for an air conditioning system, specifically a composite adjustment and control method based on a box-type fan coil unit in the air conditioning system. It adopts a fan coil unit and control mode that can be compatible with wide-range climate conditions and operate stably. It detects air temperature and humidity and executes external circulation, proportional air mixing, and internal circulation modes. This can prevent and remove condensation on the insulated water collection pan 7, and at the same time, it can adjust the operating conditions of the motor under high temperature and high humidity. This solves the consistency differences of the fan coil unit in different regions and improves the operating performance of the air conditioning system.

[0051] According to embodiments of the present invention, a control method for an air conditioning system is provided, such as... Figure 1 The diagram shows a flow chart of an embodiment of the method of the present invention. The air conditioning system has a fan coil unit, and a closed housing is provided around the fan coil unit. The fan coil unit has a fan, a water collection tray, a motor, a return air inlet, an air outlet, and a mixing air inlet. A return air inlet damper is provided at the return air inlet, an air outlet damper is provided at the air outlet, and a mixing air inlet damper is provided at the mixing air inlet. The closed housing is as follows... Figure 11 The insulation housing 1 shown, the fan as Figure 11 The fan 2 shown, the water receiving tray as Figure 11 The insulated water receiving tray 7 shown, the motor as... Figure 11 The motor 3 shown, the return air vent as Figure 11 The return air inlet 9 is shown, and the air outlet is as follows: Figure 11 The air outlet 6 shown, the mixing air outlet as Figure 11 The mixing air inlet 10 shown includes the return air inlet valve (such as the first air valve 51), the air outlet valve (such as the second air valve 52), and the mixing air inlet valve (such as the third air valve 53). Figure 11 This is a schematic diagram of the composite adjustment device for a box-type fan coil unit. Figure 11 The composite regulating device of the box-type fan coil unit shown includes: a conventional fan coil unit, an insulated shell 1, a return air inlet (i.e., return air inlet 9) damper (first damper 51), an outlet air outlet 6 damper (second damper 52), a mixing air inlet (i.e., mixing air inlet 10) damper (third damper 53), a return air inlet temperature and humidity monitoring device 81, a motor temperature monitoring device 82, and a water tray temperature control surface (i.e., water tray low temperature surface) monitoring device 83. The insulated shell 1 can be made of sheet metal, with sponge insulation inside and outside the sheet metal shell; the insulated shell can be bolted to the top cover of the fan coil unit. The mixing air inlet is where a portion of the air that has been cooled and dehumidified by the surface cooler assembly 4 is transported to the return air inlet for mixing, and then passed to the surface cooler assembly 4 again for cooling and dehumidification. When the air that has been cooled and dehumidified by the surface cooler assembly 4 passes over the surface of the water receiving pan, the air temperature on the outer surface of the water receiving pan is reduced, thus reducing the possibility of condensation. At the same time, the generated low-temperature dry airflow can further remove the condensation on the surface of the water receiving pan. Figure 11 Compared to conventional fan coil units, this design adds an insulated shell 1, internal air valves (such as the first air valve 51, the second air valve 52, and the third air valve 53), and a water collection tray temperature control surface monitoring device 83. A conventional fan coil unit includes a fan 2, a motor 3, a surface cooler assembly 4, and an insulated water collection tray 7. The insulated water collection tray 7 is a standard water collection tray, consisting of a 6mm-9mm thick insulating sponge attached to the outside of a sheet metal water collection tray; preferably, an 8mm thick insulating sponge is attached to the outside of the sheet metal water collection tray. In this invention, the fan coil unit (i.e., a conventional fan coil) and the water collection tray are standard functions. The insulation shell 1 serves to seal the fan coil and provide insulation. The first air valve 51, the second air valve 52, and the third air valve 53 respectively regulate the airflow at the return air inlet, the air outlet, and the mixing air inlet. The return air inlet temperature and humidity monitoring device 81 detects the relative humidity of the return air, the motor temperature monitoring device 82 detects the motor temperature rise, and the water collection tray temperature control surface monitoring device 83 is responsible for detecting the low-temperature area, condensation area, and rate of change of the insulation water collection tray 7. The temperature value of the condensation surface, i.e., the low-temperature surface, is less than or equal to the dew point temperature. In the solution of this invention, as... Figure 1 As shown, the control method of the air conditioning system includes steps S110 to S130.

[0052] In step S110, after the air conditioning system is turned on, the air conditioning system is controlled to operate at the target temperature and humidity for an initial set time; wherein, the target temperature and humidity is such as the target dry-bulb temperature T. 设干 Or target wet-bulb temperature T 设湿 and the target relative humidity ψ 设 .

[0053] In step S120, after controlling the air conditioning system to operate at the target temperature and humidity for an initial set time, the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water collection tray, and the temperature of the motor are acquired according to a set detection cycle; wherein, the initial set time is, for example, m0 minutes, and the indoor relative humidity of the air conditioning system is, for example, real-time relative humidity. The area of ​​the low-temperature surface of the water collection tray is the same as the area Si of the low-temperature surface of the insulated water collection tray 7, and the temperature of the motor is the same as the real-time temperature Ti of the motor. The low-temperature surface of the water collection tray refers to the surface among multiple surfaces on the outer insulation layer of the insulated water collection tray 7 whose temperature is lower than a certain preset temperature value, which is slightly higher than the current air dew point temperature. In the solution of this invention, monitoring and detection are mainly concentrated around the drain outlet of the water collection tray, because this is the low surface of the water collection tray and the place where condensation collects.

[0054] In step S130, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water collection pan, and the temperature of the motor, the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as the opening degree when opening, and / or the speed of the fan are controlled, so as to achieve anti-condensation control of the water collection pan and adjust the operating conditions of the motor to adjust the consistency differences of the fan coil unit in different regions and improve the operating performance of the air conditioning system.

[0055] The present invention, based on a box-type fan coil composite regulation and control scheme, detects air temperature and humidity, controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the fan speed, to achieve the purpose of preventing and removing condensation on the insulation drip tray 7. At the same time, it can adjust the operating conditions of the motor under high temperature and high humidity, prevent condensation from occurring on the insulation layer of the fan coil drip tray (such as the insulation drip tray 7) in high humidity environments, prevent overheating of the fan coil motor (such as the motor 3) in high temperature environments, and effectively solve the problem of inconsistency in the design, maintenance, and use of fan coils across a wide range of climates globally.

[0056] In some embodiments, when the return air inlet valve is fully open, the outlet air valve is fully open, and the mixing air inlet valve is closed, the fan coil unit operates in a preset external circulation air supply mode; the preset external circulation air supply mode is similar to the external circulation mode of the fan coil unit. When the return air inlet valve is fully open, the outlet air valve is fully open, and the mixing air inlet valve is opened according to the required mixing ratio, the fan coil unit operates in a preset proportional mixing air supply mode; the preset proportional mixing air supply mode is similar to the proportional mixing mode of the fan coil unit. When the return air inlet valve is closed, the outlet air valve is fully open, and the mixing air inlet valve is fully open, the fan coil unit operates in a preset internal circulation air supply mode; the preset internal circulation air supply mode is similar to the internal circulation mode of the fan coil unit.

[0057] Figure 12 This is a schematic diagram of the airflow in the external circulation mode of the composite adjustment device of the box-type fan coil unit. When the relative humidity of the indoor air is low and condensation is difficult to form, that is, when the internal circulation start threshold is reached, the return air inlet valve (first air valve 51) is fully open, the outlet air valve (second air valve 52) is fully open, and the mixing air inlet valve (third air valve 53) is closed. The composite adjustment device of the box-type fan coil unit has the same function as the conventional fan coil unit. The return air is treated for temperature and humidity through the surface cooler assembly 4 and blown into the room to achieve the purpose of indoor temperature and humidity regulation.

[0058] Figure 13 This is a schematic diagram of the airflow in the mixed-air mode of the composite regulating device of the box-type fan coil unit. When the relative humidity of the indoor air is between high and low humidity, condensation may form, which means that the mixed-air start-up threshold is reached. At this time, the return air valve (first air valve 51) is fully open, the air outlet valve (second air valve 52) is fully open, and the mixed air outlet valve (third air valve 53) is opened according to the required mixed-air ratio. The composite regulating device of the box-type fan coil unit can circulate some of the low-temperature and low-humidity air that has been treated by the surface cooler component 4 through the insulated water collection pan 7 to the return air outlet, thereby achieving the purpose of regulating and reducing condensation formation; at the same time, it ensures that some air is blown normally into the room to achieve the purpose of indoor temperature and humidity regulation.

[0059] In the solution of the present invention, the air mixing mode can select the corresponding air mixing ratio and air mixing opening according to the current relative humidity of the air, so as to achieve fine-grained control of the condensation area of ​​the heat preservation water receiving pan 7, and the adjustment effect is more reasonable.

[0060] Figure 14 This is a schematic diagram of the airflow in the internal circulation mode of the composite regulating device of the box-type fan coil unit. When the relative humidity of the indoor air is very high and condensation is easily formed, that is, when the internal circulation start threshold is reached, the return air valve (first air valve 51) is closed, the air outlet valve (second air valve 52) is fully open, and the mixing air valve (third air valve 53) is fully open. The air in the composite regulating device of the box-type fan coil unit circulates inside the box. The air is continuously dehumidified by passing through the surface cooler assembly 4, and at the same time, it can carry away the condensation in the insulation water collection pan 7, so as to achieve the purpose of removing the condensation in the insulation water collection pan 7.

[0061] The present invention, based on a box-type fan coil composite regulation and control scheme, detects air temperature and humidity, and executes external circulation, proportional mixing, and internal circulation modes to prevent and eliminate condensation on the insulated water collection pan 7. Simultaneously, it can adjust the motor's operating conditions under high temperature and humidity, improving the performance of the air conditioning system. The present invention employs a fan coil mixing mode to prevent condensation on the insulation layer of the fan coil water collection pan (such as the insulated water collection pan 7) in high humidity environments; it employs an internal circulation mode to prevent overheating of the fan coil motor (such as motor 3) in high temperature environments; and it adjusts the motor's operating conditions under high temperature and humidity, effectively solving the problem of inconsistencies in fan coil design, maintenance, and use across a wide global climate range.

[0062] In some embodiments, step S130 involves controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or controlling the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water tray, and the temperature of the motor. This includes the process of controlling the return air vent valve, the outlet air vent valve, and the mixing air vent valve based on the temperature of the motor.

[0063] The following is combined with Figure 2 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention, which controls the return air valve, the outlet air valve and the mixing air valve according to the temperature of the motor. The specific process of controlling the return air valve, the outlet air valve and the mixing air valve according to the temperature of the motor in step S130 is further explained, including steps S210 to S250.

[0064] Step S210: Determine whether the temperature of the motor is greater than or equal to the maximum allowable temperature of the motor; wherein, the maximum allowable temperature of the motor is, for example, temperature T. max .

[0065] Step S220: If it is determined that the temperature of the motor is greater than or equal to the maximum allowable temperature of the motor, then control the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset internal circulation air supply mode for a first set time.

[0066] Step S230: After controlling the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs in the preset internal circulation air supply mode for a first set time, determine whether the temperature of the motor is less than or equal to the normal temperature critical value of the motor; wherein, the first set time is such as m1 minutes, and the normal temperature critical value of the motor is such as temperature Tmin.

[0067] Step S240: If it is determined that the temperature of the motor is less than or equal to the normal temperature threshold of the motor, then return to the previous step to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time.

[0068] Step S250: If it is determined that the temperature of the motor is greater than the normal temperature threshold of the motor, then return to continue controlling the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset internal circulation air supply mode.

[0069] Figure 15 This is a flowchart illustrating the composite adjustment and control method for a box-type fan coil unit. Figure 15 As shown, the composite adjustment and control method for box-type fan coil units includes:

[0070] Step 1: Start the unit (such as the air conditioning system containing the fan coil unit) and set the target parameters; specifically, set the target values ​​for indoor temperature and humidity, such as setting the target dry-bulb temperature T. 设干 Target relative humidity ψ 设 or target wet-bulb temperature T 设湿 Then proceed to step 2.

[0071] Step 2: Run the unit for m0 minutes; the time m0 does not need to be too long, generally 10 to 15 minutes is sufficient. Specifically, control the unit to run according to the target parameters for m0 minutes, and then proceed to Step 3.

[0072] Step 3: Detect and monitor parameters (real-time relative humidity) Given the area Si of the low-temperature surface of the real-time heat preservation drip tray 7 and the real-time temperature Ti of the motor, determine whether the real-time temperature Ti of the motor ≥ temperature T. max (Maximum Allowable Temperature): If yes, proceed to step 3a; otherwise, proceed to step 3b. For example: by infrared detection, the sum of the detected areas with a scanning temperature below the threshold is the area Si of the low-temperature surface.

[0073] The low-temperature surface refers to the surface of the insulation layer on the outside of the water receiving tray (such as the insulated water receiving tray 7) where the temperature is lower than a certain value; the temperature of the low-temperature surface can be slightly higher than the current dew point temperature. The real-time motor temperature Ti is the temperature of the outer casing surface of the motor. Temperature T max It can reach 90% of the maximum temperature rise of the motor.

[0074] Step 3a: If the determination satisfies the condition that the real-time motor temperature Ti ≥ temperature T max If the maximum allowable temperature is specified, the process will run in internal loop mode for m1 minutes, and then proceed to step 4. The time m1 is relatively flexible and can be executed for 10 to 15 minutes.

[0075] Step 3b: If the real-time motor temperature Ti ≥ temperature T is not satisfied max If the maximum allowable temperature is reached, proceed to step 5 to further determine the real-time relative humidity. The situation.

[0076] Step 4: Following step 3a, further determine whether the motor real-time temperature Ti ≤ temperature Tmin (normal temperature critical value): If the motor real-time temperature Ti ≤ temperature Tmin is satisfied, return to step 2; if the motor real-time temperature Ti ≤ temperature Tmin is not satisfied, return to step 3a.

[0077] In step 3a, this situation occurs during the initial operation of the unit. Due to the high ambient temperature, the motor temperature rises excessively, affecting its service life. The internal circulation mode continuously cools the airflow passing through the motor through the surface cooler assembly 4, thereby rapidly cooling the motor and protecting it.

[0078] In the solution of the present invention, the low-temperature airflow that has been cooled by two devices (such as the surface cooler assembly 4) is continuously delivered through the internal circulation mode of the air box (i.e., the box-type fan), which can significantly reduce the operating temperature of the motor.

[0079] In some embodiments, step S130, which controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, further includes: a first process of controlling the return air vent valve, the outlet air vent valve, and the mixing air vent valve based on the indoor relative humidity of the air conditioning system.

[0080] The following is combined with Figure 3 The schematic diagram shown is an embodiment of the first process of controlling the return air vent valve, the outlet air valve, and the mixing air vent valve according to the indoor relative humidity of the air conditioning system in the method of the present invention. It further illustrates the specific process of the first process of controlling the return air vent valve, the outlet air valve, and the mixing air vent valve according to the indoor relative humidity of the air conditioning system in step S130, including steps S310 to S320.

[0081] Step S310: If the temperature of the motor is determined to be lower than the maximum allowable temperature of the motor, determine whether the indoor relative humidity of the air conditioning system is within the set humidity range; wherein, the set humidity range is as follows:

[0082] Step S320: If it is determined that the indoor relative humidity of the air conditioning system is within the set humidity range, then the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as their opening degree, are controlled to allow the fan coil unit to operate in a preset proportional mixing air supply mode for a second set time. After controlling the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as their opening degree, to allow the fan coil unit to operate in the preset proportional mixing air supply mode for a second set time, the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as their opening degree, are controlled according to the area of ​​the low-temperature surface of the water collection tray, and / or the fan speed is controlled. The second set time is, for example, m² minutes.

[0083] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0084] Step 5: Following step 3b, further determine whether the real-time relative humidity is met. If yes, proceed to step 5a; otherwise, proceed to step 5b.

[0085] in, It is the activation threshold of the four mixing proportional dampers. Set the relative humidity values ​​in steps, such as 40%, 60%, 80%, and 90%.

[0086] Step 5a: If the real-time relative humidity is satisfied... Then proceed to step 9 to further determine the air mixing ratio (valve opening).

[0087] Step 5b: If the real-time relative humidity is not satisfied... Then proceed to step 6 to further determine the real-time relative humidity. The specific details.

[0088] In the solution of this invention, by adopting a composite regulation and control method of box-type fan coil unit, the temperature rise of the running motor and the relative humidity are monitored. When the climatic conditions are too harsh, such as high temperature or high humidity, the internal circulation mode is triggered to quickly cool down the motor by means of corresponding threshold conditions. At the same time, the high humidity air can be quickly cooled and dehumidified, and the electrical use is adjusted to suitable operating conditions, which greatly improves the service life of key components.

[0089] In some implementations, a humidity range is defined, including: a first interval, a second interval, and a third interval where the humidity values ​​increase sequentially; the first interval is as follows: The second interval is as follows The third interval is as follows

[0090] In step S320, when the indoor relative humidity of the air conditioning system is determined to be within the set humidity range, the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, are controlled so that the fan coil unit runs the preset proportional mixing air supply mode for a second set time. For the specific process, please refer to the following exemplary description.

[0091] The following is combined with Figure 4 The schematic diagram shown is a flowchart of an embodiment of the method of the present invention, which makes the fan coil unit run in a preset proportional air mixing and air supply mode for a second set time. It further illustrates the specific process of making the fan coil unit run in the preset proportional air mixing and air supply mode for a second set time in step S320, including steps S410 to S440.

[0092] Step S410: Determine the range of indoor relative humidity of the air conditioning system within the set humidity range.

[0093] Step S420: If it is determined that the indoor relative humidity of the air conditioning system is within the first range, then the opening degree of the air mixing valve is controlled to be the first set opening degree, so that the fan coil unit runs the preset proportional air mixing mode for the second set time; wherein, the first set opening degree is the air mixing opening degree K1.

[0094] Step S430: If it is determined that the indoor relative humidity of the air conditioning system is within the second range, then the opening degree of the air mixing outlet valve is controlled to be the second preset opening degree, so that the fan coil unit runs the preset proportional air mixing mode for the second preset time; wherein, the second preset opening degree is such as the air mixing opening degree K2.

[0095] Step S440: If it is determined that the indoor relative humidity of the air conditioning system is within the third range, then the opening degree of the mixing air outlet valve is controlled to a third preset opening degree, so that the fan coil unit operates in a preset proportional mixing air supply mode for a second preset time. The third preset opening degree is, for example, the mixing air opening degree K3.

[0096] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0097] Step 9: Following step 5a, further determine the air mixing ratio (valve opening), including:

[0098] Step 9a: Run in mixed air mode for m2 minutes (e.g., 10 to 15 minutes). The specific operation method is as follows:

[0099] like Then proceed according to the mixing air opening degree K1, followed by step 9b; this is because the humidity is relatively low, the mixing air valve is opened at a low degree to perform mixing. The ability to prevent and remove condensation is relatively low.

[0100] like Then proceed according to the mixing air opening degree K2, followed by step 9b; this is for a relatively moderate humidity level, the mixing air valve is opened at a moderate degree to perform mixing. The ability to prevent and remove condensation is relatively high.

[0101] like Then proceed with the mixing air opening at K3, followed by step 9b; this is for relatively high humidity, the mixing air valve is opened to its maximum extent to perform mixing. This provides a higher level of prevention and decondensation capability. For example, K1 can be selected as 50%, K2 as 80%, and K3 as 100%.

[0102] Step 9b: After running in mixed air mode for m2 minutes, detect the area Si of the low-temperature surface of the insulated water receiving pan 7 and the rate of change Δsi of the low-temperature surface of the insulated water receiving pan 7, and then proceed to step 10. By detecting the change in the condensation surface under the current mixed air decondensation mode operation, the decondensation effect can be determined.

[0103] In the solution of this invention, by adopting the composite adjustment and control method of box-type fan coil unit, the mixed air mode regulation of the fan coil unit is realized. When the fan coil unit is running, it can autonomously select the mixed air opening level according to the current humidity. By monitoring the changes in the low temperature surface outside the water receiving tray (such as the insulated water receiving tray 7), it can autonomously select further regulation measures (such as upgrading regulation, maintaining or downgrading regulation) to systematically and continuously reduce the temperature and humidity of the air outside the low temperature surface of the water receiving tray (such as the insulated water receiving tray 7), reduce condensation formation, and achieve the purpose of eliminating condensation on the outer surface of the water receiving tray.

[0104] In some embodiments, step S130, which controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, further includes a second process of controlling the return air vent valve, the outlet air vent valve, and the mixing air vent valve based on the indoor relative humidity of the air conditioning system.

[0105] The following is combined with Figure 5 The schematic diagram shown is an embodiment of the second process of controlling the return air vent valve, the outlet air vent valve and the mixing air vent valve according to the indoor relative humidity of the air conditioning system in the method of the present invention. It further illustrates the specific process of the second process of controlling the return air vent valve, the outlet air vent valve and the mixing air vent valve according to the indoor relative humidity of the air conditioning system in step S130, including steps S510 to S530.

[0106] Step S510: If it is determined that the temperature of the motor is less than the maximum allowable temperature of the motor and the indoor relative humidity of the air conditioning system is not within the set humidity range, determine whether the indoor relative humidity of the air conditioning system is less than or equal to the lower limit of the set humidity range, and determine whether the indoor relative humidity of the air conditioning system is greater than or equal to the upper limit of the set humidity range.

[0107] Step S520: If it is determined that the indoor relative humidity of the air conditioning system is greater than or equal to the upper limit of the set humidity range, then the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as the opening degree when opening, are controlled so that the fan coil unit runs in the preset internal circulation air supply mode for a third set time; after controlling the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit runs in the preset internal circulation air supply mode for a third set time, the fan speed is controlled according to the area of ​​the low temperature surface of the water collection tray; wherein, the third set time is, for example, m3 minutes.

[0108] Step S530: If it is determined that the indoor relative humidity of the air conditioning system is less than or equal to the lower limit of the set humidity range, then the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as their opening degree, are controlled to make the fan coil unit run in the preset external circulation air supply mode for the fourth set time. After controlling the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as their opening degree, to make the fan coil unit run in the preset external circulation air supply mode for the fourth set time, the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as their opening degree, are controlled according to the area of ​​the low temperature surface of the water receiving tray, and / or the speed of the fan is controlled.

[0109] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0110] Step 6: Following step 5b, further determine whether the real-time relative humidity is met. (High humidity threshold): If yes, proceed to step 6a; otherwise, proceed to step 6b.

[0111] Step 6a: If the real-time relative humidity is satisfied... (High humidity threshold) After running in internal circulation mode for m3 minutes (e.g., 10 to 15 minutes), the area Si of the low-temperature surface of the insulated water receiving tray 7 and the rate of change Δsi of the area Si of the low-temperature surface of the insulated water receiving tray 7 are detected, and then step 7 is executed. The purpose of the internal circulation mode is that the airflow repeatedly passes through the surface cooler, and the temperature and humidity continue to decrease. This airflow can delay or even eliminate the formation of condensation, and at the same time, it can dry and remove condensation, reduce existing condensation, and effectively remove condensate. The detection of the low-temperature surface and its change here is to monitor the effect of decondensation removal. The advantage here is that when the humidity is very high, entering the internal circulation mode can continuously prevent condensation from forming and reduce the condensate that has already formed.

[0112] Step 6b: If the real-time relative humidity is not satisfied... (High humidity threshold) After running in external circulation mode for m4 minutes, the area Si of the low temperature surface of the heat preservation water tray 7 is detected; when the humidity is low, the possibility of condensation is very low. The control of cooling and dehumidification by the surface cooler component 4 does not need to be used to control the generation of condensation outside the water tray, but is directly vented to the room for indoor air conditioning.

[0113] In the solution of this invention, by adopting the composite adjustment and control method of box-type fan coil unit, the internal circulation mode of the fan coil unit is controlled. When the relative humidity reaches a relatively high level during operation, the fan coil unit can choose to enter the internal circulation mode and remove condensation from the critical point water receiving pan (such as the insulated water receiving pan 7) by using low temperature and low wind speed. At the same time, in high temperature environments, when the working motor temperature rises too high, the working motor can be cooled down, thereby ensuring the working conditions and extending the motor life.

[0114] In some embodiments, step S130, which controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water collection pan, and the temperature of the motor, further includes: a first process of controlling at least one of the speeds of the return air vent valve, the outlet air vent valve, the mixing air vent valve, and the fan based on the area of ​​the low-temperature surface of the water collection pan.

[0115] The following is combined with Figure 6 The schematic diagram shown is an embodiment of the first process of controlling at least one of the rotational speeds of the return air inlet valve, the outlet air valve, the mixing air inlet valve, and the fan according to the area of ​​the low-temperature surface of the water receiving pan in the method of the present invention. The specific process of the first process of controlling at least one of the rotational speeds of the return air inlet valve, the outlet air valve, the mixing air inlet valve, and the fan according to the area of ​​the low-temperature surface of the water receiving pan in step S130 is further explained, including steps S610 to S650.

[0116] Step S610: After determining that the temperature of the motor is less than the maximum allowable temperature of the motor and that the indoor relative humidity of the air conditioning system is within the set humidity range, after controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset proportional mixing air supply mode for a second set time, the rate of change of the area of ​​the low-temperature surface of the water collection tray during the set detection period is determined based on the area of ​​the low-temperature surface of the water collection tray, and recorded as the rate of change of the area of ​​the low-temperature surface of the water collection tray; wherein, the rate of change of the area of ​​the low-temperature surface of the water collection tray is like the rate of change of the area Si of the low-temperature surface of the real-time heat preservation water collection tray 7, Δsi. The set detection period can be one detection cycle or several detection cycles.

[0117] Step S620: Determine whether the area of ​​the low-temperature surface of the water receiving tray is less than a first set area; wherein, the first set area is Smax (threshold).

[0118] Step S630: If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the first preset area, then control the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode, and control the fan to run at the preset lowest speed for a first preset time; after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode, and control the fan to run at the preset lowest speed for a first preset time, the fan speed is controlled according to the area of ​​the low-temperature surface of the water receiving tray; wherein, the first preset time is, for example, m1 minutes.

[0119] Step S640: If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the first set area, then determine whether the rate of change of the area of ​​the low-temperature surface of the water receiving tray is less than or equal to the first set rate of change; wherein, the first set rate of change is c.

[0120] Step S650: If it is determined that the area change rate of the low-temperature surface of the water receiving pan is less than or equal to the first set change rate, then the air conditioning system is controlled to maintain the current operating state for a second set time, and then the process is returned to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time.

[0121] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0122] Step 10: Further determine whether the area Si of the real-time low-temperature surface is less than Smax (threshold): If yes, proceed to step 10a; otherwise, proceed to step 10b. For example, Smax is 20% of the total area of ​​the monitored region.

[0123] Step 10a: If it is determined that the area Si of the real-time low-temperature surface is less than Smax (threshold), then proceed to step 11 to further determine the situation of the rate of change of the low-temperature surface Δsi.

[0124] Step 10b: If it is determined that the area Si of the real-time low-temperature surface does not meet the threshold of Smax, then run the internal circulation mode for m1 minutes, detect the area Si of the low-temperature surface of the insulation water receiving pan 7 and the rate of change Δsi of the area Si of the low-temperature surface of the insulation water receiving pan 7, and then execute step 7; if the current low-temperature surface is still large (not less than Smax (threshold)), the internal circulation mixed air mode needs to be continuously executed to carry out condensation prevention treatment.

[0125] Step 11: Following step 10a, further determine whether the real-time low-temperature surface change rate Δsi ≤ c (threshold): If yes, proceed to step 11a; otherwise, proceed to step 11b. For example, c is set to 5%.

[0126] Step 11a: If the real-time low temperature surface change rate Δsi ≤ c (threshold) is satisfied, then maintain the current state for m2 minutes and return to step 2; the current low temperature surface change is relatively stable, and the prevention and decondensation implementation plan is reasonable, so it continues to run.

[0127] Step 11b: If the real-time low-temperature surface change rate Δsi ≤ c (threshold) is not satisfied, then proceed to step 12 to further determine the change of the area Si of the low-temperature surface of the current continuous detection insulated water receiving pan 7.

[0128] In the present invention, a composite adjustment and control method using a box-type fan coil unit is adopted to monitor the relative humidity of the return air and simultaneously monitor the pre-condensation area on the outer surface of the water receiving pan component. When the relative humidity of the air enters the threshold range, the matching graded mixing ratio is selected according to the subdivided threshold to gradedly regulate the condensation area of ​​the insulated water receiving pan 7, and then the regulation effect (i.e., the change in the area of ​​the low temperature region) is followed up to determine further adjustment strategies (such as upgrading or downgrading adjustment or maintaining), thereby realizing the regulation of condensation generation conditions by mixing air volume, reducing or avoiding condensation on the surface of the water receiving pan.

[0129] In some embodiments, step S130, which controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water collection pan, and the temperature of the motor, further includes a second process of controlling at least one of the speeds of the return air vent valve, the outlet air vent valve, the mixing air vent valve, and the fan based on the area of ​​the low-temperature surface of the water collection pan.

[0130] The following is combined with Figure 7The schematic diagram shown is an embodiment of the second process of controlling at least one of the rotational speeds of the return air inlet valve, the outlet air valve, the mixing air inlet valve, and the fan according to the area of ​​the low-temperature surface of the water receiving pan in the method of the present invention. The specific process of the second process of controlling at least one of the rotational speeds of the return air inlet valve, the outlet air valve, the mixing air inlet valve, and the fan according to the area of ​​the low-temperature surface of the water receiving pan in step S130 is further explained, including steps S710 to S740.

[0131] Step S710: The area of ​​the low-temperature surface of the water receiving tray obtained in the current detection cycle is recorded as the current value of the area of ​​the low-temperature surface of the water receiving tray; the area of ​​the low-temperature surface of the water receiving tray obtained in the previous detection cycle is recorded as the previous value of the area of ​​the low-temperature surface of the water receiving tray; the previous detection cycle is the cycle before the current detection cycle.

[0132] Step S720: After determining that the temperature of the motor is less than the maximum allowable temperature of the motor and that the indoor relative humidity of the air conditioning system is within the set humidity range, after controlling the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset proportional mixing air supply mode for a second set time, and after determining that the area of ​​the low-temperature surface of the water collection tray is less than the first set area, if it is determined that the rate of change of the area of ​​the low-temperature surface of the water collection tray is greater than the first set rate of change, then it is determined whether the current value of the area of ​​the low-temperature surface of the water collection tray is less than the previous value of the area of ​​the low-temperature surface of the water collection tray.

[0133] Step S730: If it is determined that the current value of the area of ​​the low-temperature surface of the water receiving tray is less than the previous value of the area of ​​the low-temperature surface of the water receiving tray, then control the fan speed to decrease to a preset level and run for a second set time, and then return to control the air conditioning system to run at the target temperature and humidity for the initial set time; or control the opening of the mixing air valve to decrease to a preset opening and then make the fan coil run in a preset proportional mixing air supply mode for a second set time, and then return to control the air conditioning system to run at the target temperature and humidity for the initial set time; wherein, the preset level is such as level 1, and the preset opening is such as level 1 mixing opening K.

[0134] Step S740: If it is determined that the current value of the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the previous value of the area of ​​the low-temperature surface of the water receiving tray, then control the fan speed to increase to a preset level and run for a second preset time, and then return to control the air conditioning system to run at the target temperature and humidity for the initial preset time; or control the opening of the mixing air valve to increase to a preset opening level and then make the fan coil run in a preset proportional mixing air supply mode for a second preset time, and then return to control the air conditioning system to run at the target temperature and humidity for the initial preset time.

[0135] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0136] Step 12: Following step 11b, determine whether the area Si of the current low-temperature surface is less than S. i-1 If yes, proceed to step 12a; otherwise, proceed to step 12b. Where S... i-1 It is the area Si of the low-temperature surface detected in the previous detection cycle.

[0137] Step 12a: If it is determined that the area Si of the current low-temperature surface is less than S i-1 If the fan speed is reduced by 1 level or the mixing air opening is reduced by 1 level K, run for m2 minutes, and then return to step 2; the current low temperature surface is much smaller than the previous condensation surface, indicating that the implementation of the prevention and decondensation plan is unreasonable (too large), so the excessive capacity is reduced by lowering the fan speed, thereby adjusting the implementation strategy.

[0138] Step 12b: If it is determined that the area Si of the current low-temperature surface does not satisfy S... i-1 If the fan speed is increased by 1 level or the mixing air opening K is increased by 1 level, run for m2 minutes, and then return to step 2; the current low temperature surface is much larger than the previous condensation surface, indicating that the implementation of the prevention and decondensation plan is unreasonable (too small), so the capacity is increased by increasing the fan speed, thereby adjusting the implementation strategy.

[0139] In the solution of this invention, a composite adjustment and control method of box-type fan coil unit is adopted. During the operation of the fan coil unit, the real-time air humidity is detected, and then compared with the actual situation for classified control. Through box-type internal circulation, external circulation, proportional air mixing and autonomous adjustment strategies, the condensation control and treatment of water tray, electrical temperature rise control and indoor air conditioning are met under different temperature and humidity conditions, taking into account both comfort requirements and equipment operating environment requirements.

[0140] In some embodiments, step S130, which controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, further includes a third process of controlling at least one of the speeds of the return air vent valve, the outlet air vent valve, the mixing air vent valve, and the fan based on the area of ​​the low-temperature surface of the water receiving pan.

[0141] The following is combined with Figure 8The schematic diagram shown is an embodiment of the third process of controlling at least one of the rotational speeds of the return air inlet valve, the outlet air valve, the mixing air inlet valve, and the fan according to the area of ​​the low-temperature surface of the water receiving pan in the method of the present invention. The specific process of the third process of controlling at least one of the rotational speeds of the return air inlet valve, the outlet air valve, the mixing air inlet valve, and the fan according to the area of ​​the low-temperature surface of the water receiving pan in step S130 is further explained, including steps S810 to S860.

[0142] Step S810: After controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, and the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode for a third preset time, or after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, and the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode, and controlling the fan to operate at the preset lowest gear for a first preset time, the change rate of the area of ​​the low-temperature surface of the water receiving tray during the preset detection period is determined based on the area of ​​the low-temperature surface of the water receiving tray, and recorded as the change rate of the area of ​​the low-temperature surface of the water receiving tray; wherein, the change rate of the area of ​​the low-temperature surface of the water receiving tray is like the change rate Δsi of the area Si of the low-temperature surface of the real-time heat preservation water receiving tray 7.

[0143] Step S820: Determine whether the rate of change of the area of ​​the low-temperature surface of the water receiving tray is less than or equal to a second set rate of change; wherein, the second set rate of change is 1 min.

[0144] Step S830: If it is determined that the area change rate of the low-temperature surface of the water receiving tray is less than or equal to the second set change rate, then the fan speed is controlled to be increased to a preset level and run for a fourth set time, and then the process is returned to re-determine whether the area change rate of the low-temperature surface of the water receiving tray is less than or equal to the second set change rate.

[0145] Step S840: If it is determined that the area change rate of the low-temperature surface of the water receiving tray is greater than the second set change rate, then it is determined whether the area of ​​the low-temperature surface of the water receiving tray is less than the second set area; wherein, the second set area is Smin (threshold).

[0146] Step S850: If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the second set area, then return to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time.

[0147] Step S860: If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the second set area, then return to continue controlling the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset internal circulation air supply mode for the third set time.

[0148] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0149] Step 7: Following steps 6a and 6b, further determine whether the change rate Δsi of the low-temperature surface area Si of the real-time heat preservation water receiving pan 7 satisfies the condition ≤ Lmin (threshold): If yes, proceed to step 7a; otherwise, proceed to step 7b. For example, Lmin is set to 5%.

[0150] Step 7a: If it is determined that the change rate of the low-temperature surface area Si of the real-time heat preservation water receiving pan 7 is Δsi, i.e., the change rate of the low-temperature surface Δsi ≤ Lmin (threshold), then increase the fan speed by 1 level and run for m4 minutes, then return to step 7. Under the current internal circulation state, the condensation surface decreases slowly. Increasing the fan speed by 1 level can accelerate the reduction and elimination of condensation.

[0151] Step 7b: If it is determined that the change rate Δsi of the low-temperature surface area Si of the real-time insulation water receiving pan 7 is not satisfied, i.e., the change rate Δsi of the low-temperature surface is ≤ Lmin (threshold), then step 8 is executed to further determine the area Si of the low-temperature surface of the real-time insulation water receiving pan 7.

[0152] Step 8: Following step 7b, further determine whether the area Si of the real-time low-temperature surface is less than Smin (threshold): If yes, proceed to step 8a; otherwise, proceed to step 8b. For example, Smin is taken as 2% of the total area of ​​the monitored region.

[0153] Step 8a: If it is determined that the area Si of the real-time low-temperature surface is less than Smin (threshold), then return to step 2.

[0154] Step 8b: If it is determined that the area Si of the real-time low-temperature surface does not meet the threshold of Smin, then return to step 6a.

[0155] In the present invention, a composite regulation and control method using a box-type fan coil unit is adopted to monitor the relative humidity of the return air. When the relative humidity of the return air is too high (i.e., when the high humidity threshold is reached), the internal circulation operation mode is activated. Through the continuous cooling and dehumidification effect of the circulating air, the condensation on the outer surface of the water receiving pan is gradually removed. Then, by detecting the change in condensation, a further adjustment strategy (upgrading or downgrading) is determined. Furthermore, when the condensation on the water receiving pan reaches the exit threshold, the unit can enter the mixed air or external circulation mode for regulation, thereby realizing the regulation of condensation generation during unit operation under different relative humidity conditions.

[0156] In some embodiments, step S130, which controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, further includes a fourth process of controlling at least one of the speeds of the return air vent valve, the outlet air vent valve, the mixing air vent valve, and the fan based on the area of ​​the low-temperature surface of the water receiving pan.

[0157] The following is combined with Figure 9 The schematic diagram shown is an embodiment of the fourth process of controlling at least one of the rotational speeds of the return air inlet valve, the outlet air valve, the mixing air inlet valve, and the fan according to the area of ​​the low-temperature surface of the water receiving pan in the method of the present invention. The specific process of the fourth process of controlling at least one of the rotational speeds of the return air inlet valve, the outlet air valve, the mixing air inlet valve, and the fan according to the area of ​​the low-temperature surface of the water receiving pan in step S130 is further explained, including steps S910 to S930.

[0158] Step S910: After controlling the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset external circulation air supply mode for a fourth set time, it is determined whether the area of ​​the low temperature surface of the water receiving tray is less than the first set area; wherein, the first set area is Smax (threshold).

[0159] Step S920: If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the first set area, then return to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time.

[0160] Step S930: If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the first set area, then continue to control the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset internal circulation air supply mode and controls the fan to run at the preset lowest gear for the first set time.

[0161] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0162] In step 6b, if it is determined that the real-time relative humidity is not met... (High humidity threshold) After running in external circulation mode for m4 minutes, the area Si of the low temperature surface of the insulated water tray 7 is detected. Then it is determined whether the real-time low temperature surface area Si < Smax (threshold) is met: if so, return to step 2; otherwise, run in internal circulation mode and run at low speed for m1 minutes, and detect the area Si of the low temperature surface of the insulated water tray 7 and the rate of change Δsi of the area Si of the low temperature surface of the insulated water tray 7. Then execute step 7. When the humidity is low, the possibility of condensation is very low. The control of cooling and dehumidification by the surface cooler component 4 does not need to be used to control the generation of condensation outside the water tray. Instead, it is directly vented to the room for indoor air conditioning.

[0163] In the present invention, the composite adjustment and control method of the box-type fan coil unit in the air conditioning system is as follows: through box-type internal circulation, external circulation, proportional air mixing and autonomous adjustment strategies, the condensation control and treatment of the water tray, the control of electrical temperature rise and the indoor air conditioning are met under different temperature and humidity conditions.

[0164] The technical solution of this embodiment involves setting a closed shell (such as insulation shell 1) around the fan coil unit to form a box-type fan coil unit for an air conditioning system with a fan coil unit. A return air inlet valve (such as the first valve 51) is installed at the return air inlet of the fan coil unit, an outlet air inlet valve (such as the second valve 52) is installed at the outlet air inlet of the fan coil unit, and a mixing air inlet valve (such as the third valve 53) is installed at the mixing air inlet of the fan coil unit. After the air conditioning system is turned on and runs according to preset parameters for a period of time (such as time m0), the relative humidity of the indoor environment (such as real-time relative humidity) is considered. The system controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening ratio when they are open, based on the relative humidity of the indoor environment, the area of ​​the low-temperature surface of the water collection tray (such as the insulated water collection tray 7) (e.g., the area Si of the low-temperature surface of the insulated water collection tray 7), and the temperature of the motor of the fan in the air handling unit (e.g., the real-time temperature Ti). This allows the system to execute at least one of the following operating modes: external circulation mode, proportional mixing mode, and internal circulation mode, and to control the fan speed. Thus, by controlling at least one air supply mode of the air handling unit (external circulation mode, proportional mixing mode, and internal circulation mode) based on the relative humidity of the indoor environment, the area of ​​the low-temperature surface of the water collection tray, and the motor temperature, and controlling the fan speed, the system achieves anti-condensation control of the water collection tray and adjusts the operating conditions of the motor to address the consistency differences of the air handling unit in different regions, thereby improving the operating performance of the air conditioning system.

[0165] According to an embodiment of the present invention, a control device for a fan coil unit corresponding to a control method for an air conditioning system is also provided. See also Figure 10The diagram shows a structural schematic of an embodiment of the device of the present invention. The air conditioning system has a fan coil unit, and a closed housing is provided around the fan coil unit. The fan coil unit has a fan, a water collection tray, a motor, a return air inlet, an air outlet, and a mixing air inlet. A return air inlet valve is provided at the return air inlet, an air outlet valve is provided at the air outlet, and a mixing air inlet valve is provided at the mixing air inlet. The closed housing is as follows... Figure 11 The insulation housing 1 shown, the fan as Figure 11 The fan 2 shown, the water receiving tray as Figure 11 The insulated water receiving tray 7 shown, the motor as... Figure 11 The motor 3 shown, the return air vent as Figure 11 The return air inlet 9 is shown, and the air outlet is as follows: Figure 11 The air outlet 6 shown, the mixing air outlet as Figure 11 The mixing air inlet 10 shown, the return air outlet valve (such as the first air valve 51), the air outlet valve (such as the second air valve 52), and the mixing air outlet valve (such as the third air valve 53) are shown. Figure 11 This is a schematic diagram of the composite adjustment device for a box-type fan coil unit. Figure 11 The composite adjustment device of the box-type fan coil unit shown includes: a conventional fan coil unit, an insulation shell 1, a return air inlet (i.e., return air inlet 9) air valve (first air valve 51), an air outlet 6 air valve (second air valve 52), a mixing air inlet (i.e., mixing air inlet 10) air valve (third air valve 53), a return air inlet temperature and humidity monitoring device 81, a motor temperature monitoring device 82, and a water receiving tray temperature control surface monitoring device 83. Figure 11 Compared to conventional fan coil units, this design adds an insulated shell 1, internal air valves (such as the first air valve 51, the second air valve 52, and the third air valve 53), and a water collection tray temperature control surface monitoring device 83. A conventional fan coil unit includes a fan 2, a motor 3, a surface cooler assembly 4, and an insulated water collection tray 7. The insulated water collection tray 7 is a standard water collection tray, consisting of a 6mm-9mm thick insulating sponge, preferably an 8mm thick insulating sponge. The fan coil unit (i.e., the conventional fan coil unit) and the water collection tray are standard functions. The insulated shell 1 seals the fan coil unit and provides insulation. The first air valve 51, the second air valve 52, and the third air valve 53 regulate the airflow at the return air inlet, the outlet air inlet, and the mixing air inlet, respectively. The return air inlet temperature and humidity monitoring device 81 detects the relative humidity of the return air, the motor temperature monitoring device 82 detects the motor temperature rise, and the water collection tray temperature control surface monitoring device 83 is responsible for detecting the low-temperature area, condensation area, and rate of change of the insulated water collection tray 7. In the solution of the present invention, such as Figure 10 As shown, the control device of the air conditioning system includes: an acquisition unit 102 and a control unit 104.

[0166] The control unit 104 is configured to control the air conditioning system to operate at a target temperature and humidity for an initial set time after the air conditioning system is turned on; wherein the target temperature and humidity is, for example, the target dry-bulb temperature T. 设干 Or target wet-bulb temperature T 设湿 and the target relative humidity ψ 设 The specific functions and processing of the control unit 104 are described in step S110.

[0167] The acquisition unit 102 is configured to acquire, according to a set detection cycle, the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water collection tray, and the temperature of the motor after the air conditioning system has been controlled to operate at the target temperature and humidity for an initial set time; wherein the initial set time is, for example, m0 minutes, and the indoor relative humidity of the air conditioning system is, for example, real-time relative humidity. The area of ​​the low-temperature surface of the water receiving tray is the same as the area Si of the low-temperature surface of the insulated water receiving tray 7, and the temperature of the motor is the same as the real-time temperature Ti of the motor. For the specific functions and processing of this acquisition unit 102, please refer to step S120.

[0168] The control unit 104 is further configured to control the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or control the fan speed based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the condensate tray, and the temperature of the motor, so as to achieve anti-condensation control of the condensate tray and adjust the operating conditions of the motor to adjust the consistency differences of the fan coil unit in different regions and improve the operating performance of the air conditioning system. The specific functions and processing of the control unit 104 are further described in step S130.

[0169] The present invention, based on a box-type fan coil composite regulation and control scheme, detects air temperature and humidity, controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the fan speed, to achieve the purpose of preventing and removing condensation on the insulation drip tray 7. At the same time, it can adjust the operating conditions of the motor under high temperature and high humidity, prevent condensation from occurring on the insulation layer of the fan coil drip tray (such as the insulation drip tray 7) in high humidity environments, prevent overheating of the fan coil motor (such as the motor 3) in high temperature environments, and effectively solve the problem of inconsistency in the design, maintenance, and use of fan coils across a wide range of climates globally.

[0170] In some embodiments, when the return air inlet valve is fully open, the outlet air valve is fully open, and the mixing air inlet valve is closed, the fan coil unit operates in a preset external circulation air supply mode; the preset external circulation air supply mode is similar to the external circulation mode of the fan coil unit. When the return air inlet valve is fully open, the outlet air valve is fully open, and the mixing air inlet valve is opened according to the required mixing ratio, the fan coil unit operates in a preset proportional mixing air supply mode; the preset proportional mixing air supply mode is similar to the proportional mixing mode of the fan coil unit. When the return air inlet valve is closed, the outlet air valve is fully open, and the mixing air inlet valve is fully open, the fan coil unit operates in a preset internal circulation air supply mode; the preset internal circulation air supply mode is similar to the internal circulation mode of the fan coil unit.

[0171] Figure 12 This is a schematic diagram of the airflow in the external circulation mode of the composite adjustment device of the box-type fan coil unit. When the relative humidity of the indoor air is low and condensation is difficult to form, that is, when the internal circulation start threshold is reached, the return air inlet valve (first air valve 51) is fully open, the outlet air valve (second air valve 52) is fully open, and the mixing air inlet valve (third air valve 53) is closed. The composite adjustment device of the box-type fan coil unit has the same function as the conventional fan coil unit. The return air is treated for temperature and humidity through the surface cooler assembly 4 and blown into the room to achieve the purpose of indoor temperature and humidity regulation.

[0172] Figure 13 This is a schematic diagram of the airflow in the mixed-air mode of the composite regulating device of the box-type fan coil unit. When the relative humidity of the indoor air is between high and low humidity, condensation may form, which means that the mixed-air start-up threshold is reached. At this time, the return air valve (first air valve 51) is fully open, the air outlet valve (second air valve 52) is fully open, and the mixed air outlet valve (third air valve 53) is opened according to the required mixed-air ratio. The composite regulating device of the box-type fan coil unit can circulate some of the low-temperature and low-humidity air that has been treated by the surface cooler component 4 through the insulated water collection pan 7 to the return air outlet, thereby achieving the purpose of regulating and reducing condensation formation; at the same time, it ensures that some air is blown normally into the room to achieve the purpose of indoor temperature and humidity regulation.

[0173] In the solution of the present invention, the air mixing mode can select the corresponding air mixing ratio and air mixing opening according to the current relative humidity of the air, so as to achieve fine-grained control of the condensation area of ​​the heat preservation water receiving pan 7, and the adjustment effect is more reasonable.

[0174] Figure 14This is a schematic diagram of the airflow in the internal circulation mode of the composite regulating device of the box-type fan coil unit. When the relative humidity of the indoor air is very high and condensation is easily formed, that is, when the internal circulation start threshold is reached, the return air valve (first air valve 51) is closed, the air outlet valve (second air valve 52) is fully open, and the mixing air valve (third air valve 53) is fully open. The air in the composite regulating device of the box-type fan coil unit circulates inside the box. The air is continuously dehumidified by passing through the surface cooler assembly 4, and at the same time, it can carry away the condensation in the insulation water collection pan 7, so as to achieve the purpose of removing the condensation in the insulation water collection pan 7.

[0175] The present invention, based on a box-type fan coil composite regulation and control scheme, detects air temperature and humidity, and executes external circulation, proportional mixing, and internal circulation modes to prevent and eliminate condensation on the insulated water collection pan 7. Simultaneously, it can adjust the motor's operating conditions under high temperature and humidity, improving the performance of the air conditioning system. The present invention employs a fan coil mixing mode to prevent condensation on the insulation layer of the fan coil water collection pan (such as the insulated water collection pan 7) in high humidity environments; it employs an internal circulation mode to prevent overheating of the fan coil motor (such as motor 3) in high temperature environments; and it adjusts the motor's operating conditions under high temperature and humidity, effectively solving the problem of inconsistencies in fan coil design, maintenance, and use across a wide global climate range.

[0176] In some embodiments, the control unit 104 controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. This includes the process of controlling the return air vent valve, the outlet air vent valve, and the mixing air vent valve based on the temperature of the motor, as detailed below:

[0177] The control unit 104 is further configured to determine whether the temperature of the motor is greater than or equal to the maximum allowable temperature of the motor; wherein the maximum allowable temperature of the motor is, for example, temperature T. max For details on the specific functions and processing of the control unit 104, please refer to step S210.

[0178] The control unit 104 is further configured to, if it is determined that the temperature of the motor is greater than or equal to the maximum allowable temperature of the motor, control the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode for a first set time. The specific functions and processing of this control unit 104 are further described in step S220.

[0179] The control unit 104 is further configured to, after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, and the degree of opening when opening, so that the fan coil unit operates in a preset internal circulation air supply mode for a first set time, determine whether the temperature of the motor is less than or equal to the normal temperature threshold of the motor; wherein, the first set time is, for example, m1 minutes, and the normal temperature threshold of the motor is, for example, temperature Tmin. The specific functions and processing of the control unit 104 are further described in step S230.

[0180] The control unit 104 is further configured to, if it is determined that the temperature of the motor is less than or equal to the normal temperature threshold of the motor, return to the previous setting to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time. The specific functions and processing of this control unit 104 are further described in step S240.

[0181] The control unit 104 is further configured to, if it is determined that the temperature of the motor is greater than the normal temperature threshold of the motor, return to continue controlling the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode. The specific functions and processing of this control unit 104 are further described in step S250.

[0182] Figure 15 This is a flowchart illustrating the composite adjustment and control method for a box-type fan coil unit. Figure 15 As shown, the composite adjustment and control method for box-type fan coil units includes:

[0183] Step 1: Start the unit (such as the air conditioning system containing the fan coil unit) and set the target parameters; specifically, set the target values ​​for indoor temperature and humidity, such as setting the target dry-bulb temperature T. 设干 Target relative humidity ψ 设 or target wet-bulb temperature T 设湿 Then proceed to step 2.

[0184] Step 2: Run the unit for m0 minutes; the time m0 does not need to be too long, generally 10 to 15 minutes is sufficient. Specifically, control the unit to run according to the target parameters for m0 minutes, and then proceed to Step 3.

[0185] Step 3: Detect and monitor parameters (real-time relative humidity) Given the area Si of the low-temperature surface of the real-time heat preservation drip tray 7 and the real-time temperature Ti of the motor, determine whether the real-time temperature Ti of the motor ≥ temperature T. max (Maximum allowable temperature): If yes, proceed to step 3a; otherwise, proceed to step 3b.

[0186] The low-temperature surface refers to the surface of the insulation layer on the outside of the water receiving tray (such as the insulated water receiving tray 7) where the temperature is lower than a certain value; the temperature of the low-temperature surface can be slightly higher than the current dew point temperature. The real-time motor temperature Ti is the temperature of the outer casing surface of the motor. Temperature T max It can reach 90% of the maximum temperature rise of the motor.

[0187] Step 3a: If the determination satisfies the condition that the real-time motor temperature Ti ≥ temperature T max If the maximum allowable temperature is specified, the process will run in internal loop mode for m1 minutes, and then proceed to step 4. The time m1 is relatively flexible and can be executed for 10 to 15 minutes.

[0188] Step 3b: If the real-time motor temperature Ti ≥ temperature T is not satisfied max If the maximum allowable temperature is reached, proceed to step 5 to further determine the real-time relative humidity. The situation.

[0189] Step 4: Following step 3a, further determine whether the motor real-time temperature Ti ≤ temperature Tmin (normal temperature critical value): If the motor real-time temperature Ti ≤ temperature Tmin is satisfied, return to step 2; if the motor real-time temperature Ti ≤ temperature Tmin is not satisfied, return to step 3a.

[0190] In step 3a, this situation occurs during the initial operation of the unit. Due to the high ambient temperature, the motor temperature rises excessively, affecting its service life. The internal circulation mode continuously cools the airflow passing through the motor through the surface cooler assembly 4, thereby rapidly cooling the motor and protecting it.

[0191] In the solution of the present invention, the low-temperature airflow that has been cooled by two devices (such as the surface cooler assembly 4) is continuously delivered through the internal circulation mode of the air box (i.e., the box-type fan), which can significantly reduce the operating temperature of the motor.

[0192] In some embodiments, the control unit 104 controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. The control unit 104 further includes a first process of controlling the return air vent valve, the outlet air vent valve, and the mixing air vent valve based on the indoor relative humidity of the air conditioning system, as detailed below:

[0193] The control unit 104 is further configured to determine whether the indoor relative humidity of the air conditioning system is within a set humidity range when the temperature of the motor is determined to be lower than the maximum allowable temperature of the motor; wherein, the set humidity range is as follows: For details on the specific functions and processing of the control unit 104, please refer to step S310.

[0194] The control unit 104 is further configured to, if it is determined that the indoor relative humidity of the air conditioning system is within a set humidity range, control the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset proportional mixing air supply mode for a second set time; after controlling the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset proportional mixing air supply mode for a second set time, control the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when opening, and / or control the fan speed according to the area of ​​the low-temperature surface of the water receiving tray. The second set time is, for example, m² minutes. The specific functions and processing of this control unit 104 are further described in step S320.

[0195] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0196] Step 5: Following step 3b, further determine whether the real-time relative humidity is met. If yes, proceed to step 5a; otherwise, proceed to step 5b.

[0197] in, It is the activation threshold of the four mixing proportional dampers. Set the relative humidity values ​​in steps, such as 40%, 60%, 80%, and 90%.

[0198] Step 5a: If the real-time relative humidity is satisfied... Then proceed to step 9 to further determine the air mixing ratio (valve opening).

[0199] Step 5b: If the real-time relative humidity is not satisfied... Then proceed to step 6 to further determine the real-time relative humidity. The specific details.

[0200] In the solution of this invention, by adopting a composite regulation and control method of box-type fan coil unit, the temperature rise of the running motor and the relative humidity are monitored. When the climatic conditions are too harsh, such as high temperature or high humidity, the internal circulation mode is triggered to quickly cool down the motor by means of corresponding threshold conditions. At the same time, the high humidity air can be quickly cooled and dehumidified, and the electrical use is adjusted to suitable operating conditions, which greatly improves the service life of key components.

[0201] In some implementations, a humidity range is defined, including: a first interval, a second interval, and a third interval where the humidity values ​​increase sequentially; the first interval is as follows: The second interval is as follows The third interval is as follows

[0202] The control unit 104, upon determining that the indoor relative humidity of the air conditioning system is within a set humidity range, controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset proportional mixing air supply mode for a second set time, including:

[0203] The control unit 104 is further configured to determine the range to which the indoor relative humidity of the air conditioning system falls within a set humidity range. The specific functions and processing of the control unit 104 are further described in step S410.

[0204] The control unit 104 is further configured to, if it is determined that the indoor relative humidity of the air conditioning system is within a first range, control the opening degree of the mixing air outlet valve to a first preset opening degree, so that the fan coil unit operates in a preset proportional mixing air supply mode for a second preset time; wherein, the first preset opening degree is such as the mixing air opening degree K1. The specific functions and processing of the control unit 104 are further described in step S420.

[0205] The control unit 104 is further configured to, if it is determined that the indoor relative humidity of the air conditioning system is within a second range, control the opening degree of the mixing air outlet valve to a second preset opening degree, so that the fan coil unit operates in a preset proportional mixing air supply mode for a second preset time; wherein, the second preset opening degree is, for example, the mixing air opening degree K2. The specific functions and processing of the control unit 104 are further described in step S430.

[0206] The control unit 104 is further configured to, if it is determined that the indoor relative humidity of the air conditioning system is within a third range, control the opening degree of the mixing air outlet valve to a third preset opening degree, so that the fan coil unit operates in a preset proportional mixing air supply mode for a second preset time. The third preset opening degree is, for example, the mixing opening degree K3. The specific functions and processing of this control unit 104 are further described in step S440.

[0207] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0208] Step 9: Following step 5a, further determine the air mixing ratio (valve opening), including:

[0209] Step 9a: Run in mixed air mode for m2 minutes. The specific operation method is as follows:

[0210] like Then proceed according to the mixing air opening degree K1, followed by step 9b; this is because the humidity is relatively low, the mixing air valve is opened at a low degree to perform mixing. The ability to prevent and remove condensation is relatively low.

[0211] like Then proceed according to the mixing air opening degree K2, followed by step 9b; this is for a relatively moderate humidity level, the mixing air valve is opened at a moderate degree to perform mixing. The ability to prevent and remove condensation is relatively high.

[0212] like Then proceed according to the mixing air opening degree K3, followed by step 9b; this is for relatively high humidity, the mixing air valve is opened to the maximum degree to perform mixing. The ability to prevent and remove condensation is relatively higher.

[0213] Step 9b: After running in mixed air mode for m2 minutes, detect the area Si of the low-temperature surface of the insulated water receiving pan 7 and the rate of change Δsi of the low-temperature surface of the insulated water receiving pan 7, and then proceed to step 10. By detecting the change in the condensation surface under the current mixed air decondensation mode operation, the decondensation effect can be determined.

[0214] In the solution of this invention, by adopting the composite adjustment and control method of box-type fan coil unit, the mixed air mode regulation of the fan coil unit is realized. When the fan coil unit is running, it can autonomously select the mixed air opening level according to the current humidity. By monitoring the changes in the low temperature surface outside the water receiving tray (such as the insulated water receiving tray 7), it can autonomously select further regulation measures (such as upgrading regulation, maintaining or downgrading regulation) to systematically and continuously reduce the temperature and humidity of the air outside the low temperature surface of the water receiving tray (such as the insulated water receiving tray 7), reduce condensation formation, and achieve the purpose of eliminating condensation on the outer surface of the water receiving tray.

[0215] In some embodiments, the control unit 104 controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. The control unit also includes a second process of controlling the return air vent valve, the outlet air vent valve, and the mixing air vent valve based on the indoor relative humidity of the air conditioning system, as detailed below:

[0216] The control unit 104 is further configured to, when determining that the temperature of the motor is less than the maximum allowable temperature of the motor and that the indoor relative humidity of the air conditioning system is not within the set humidity range, determine whether the indoor relative humidity of the air conditioning system is less than or equal to the lower limit of the set humidity range, and determine whether the indoor relative humidity of the air conditioning system is greater than or equal to the upper limit of the set humidity range. The specific functions and processing of this control unit 104 are further described in step S510.

[0217] The control unit 104 is further configured to, if it is determined that the indoor relative humidity of the air conditioning system is greater than or equal to the upper limit of a set humidity range, control the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode for a third set time; after controlling the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode for a third set time, control the fan speed according to the area of ​​the low-temperature surface of the water collection tray; wherein, the third set time is, for example, m3 minutes. The specific functions and processing of this control unit 104 are also described in step S520.

[0218] The control unit 104 is further configured to, if it is determined that the indoor relative humidity of the air conditioning system is less than or equal to the lower limit of a set humidity range, control the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when they are open, so that the fan coil unit operates in a preset external circulation air supply mode for a fourth set time; after controlling the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when they are open, so that the fan coil unit operates in the preset external circulation air supply mode for a fourth set time, control the opening and closing of the return air vent valve, the outlet air valve, and the mixing air vent valve, as well as the opening degree when they are open, and / or control the speed of the fan, based on the area of ​​the low-temperature surface of the water collection tray. The specific functions and processing of this control unit 104 are further described in step S530.

[0219] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0220] Step 6: Following step 5b, further determine whether the real-time relative humidity is met. (High humidity threshold): If yes, proceed to step 6a; otherwise, proceed to step 6b.

[0221] Step 6a: If the real-time relative humidity is satisfied... (High humidity threshold) After running in internal circulation mode for m3 minutes, the area Si of the low-temperature surface of the insulated water receiving tray 7 and the rate of change Δsi of the area Si of the low-temperature surface of the insulated water receiving tray 7 are detected, and then step 7 is executed. The purpose of the internal circulation mode is that the airflow repeatedly passes through the surface cooler, and the temperature and humidity continue to decrease. This airflow can delay or even eliminate the formation of condensation, and at the same time, it can dry and remove condensation, reduce existing condensation, and effectively remove condensate. The detection of the low-temperature surface and its change here is to monitor the effect of decondensation removal. The advantage here is that when the humidity is very high, entering the internal circulation mode can continuously prevent condensation from forming and reduce the condensate that has already formed.

[0222] Step 6b: If the real-time relative humidity is not satisfied... (High humidity threshold) After running in external circulation mode for m4 minutes, the area Si of the low temperature surface of the heat preservation water tray 7 is detected; when the humidity is low, the possibility of condensation is very low. The control of cooling and dehumidification by the surface cooler component 4 does not need to be used to control the generation of condensation outside the water tray, but is directly vented to the room for indoor air conditioning.

[0223] In the solution of this invention, by adopting the composite adjustment and control method of box-type fan coil unit, the internal circulation mode of the fan coil unit is controlled. When the relative humidity reaches a relatively high level during operation, the fan coil unit can choose to enter the internal circulation mode and remove condensation from the critical point water receiving pan (such as the insulated water receiving pan 7) by using low temperature and low wind speed. At the same time, in high temperature environments, when the working motor temperature rises too high, the working motor can be cooled down, thereby ensuring the working conditions and extending the motor life.

[0224] In some embodiments, the control unit 104 controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. The control unit further includes a first process of controlling at least one of the speeds of the return air vent valve, the outlet air vent valve, the mixing air vent valve, and the fan based on the area of ​​the low-temperature surface of the drip tray, as detailed below:

[0225] The control unit 104 is further configured to, when determining that the temperature of the motor is less than the maximum allowable temperature of the motor and that the indoor relative humidity of the air conditioning system is within a set humidity range, control the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset proportional mixing air supply mode for a second set time, and then, based on the area of ​​the low-temperature surface of the water collection tray, determine the rate of change of the area of ​​the low-temperature surface of the water collection tray within a set detection period, and record it as the rate of change of the area of ​​the low-temperature surface of the water collection tray; wherein, the rate of change of the area of ​​the low-temperature surface of the water collection tray is like the rate of change of the area Si of the low-temperature surface of the real-time heat preservation water collection tray 7, Δsi. The specific functions and processing of this control unit 104 are further described in step S610.

[0226] The control unit 104 is further configured to determine whether the area of ​​the low-temperature surface of the water receiving tray is less than a first preset area; wherein the first preset area is, for example, Smax (threshold). The specific functions and processing of the control unit 104 are further described in step S620.

[0227] The control unit 104 is further configured to, if it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to a first preset area, control the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode and the fan operates at a preset lowest speed for a first preset time; after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode and the fan operates at a preset lowest speed for a first preset time, control the speed of the fan according to the area of ​​the low-temperature surface of the water receiving tray; wherein, the first preset time is, for example, m1 minutes. The specific functions and processing of this control unit 104 are also described in step S630.

[0228] The control unit 104 is further configured to determine whether the rate of change of the area of ​​the low-temperature surface of the water receiving tray is less than or equal to a first set rate of change if the area of ​​the low-temperature surface of the water receiving tray is determined to be less than or equal to a first set rate of change; wherein the first set rate of change is c. The specific functions and processing of the control unit 104 are further described in step S640.

[0229] The control unit 104 is further configured to, if it is determined that the rate of change of the low-temperature surface of the water tray is less than or equal to a first set rate of change, control the air conditioning system to maintain its current operating state for a second set time, and then return to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time. The specific functions and processing of this control unit 104 are further described in step S650.

[0230] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0231] Step 10: Further determine whether the area Si of the real-time low-temperature surface is less than Smax (threshold): If yes, proceed to step 10a; otherwise, proceed to step 10b.

[0232] Step 10a: If it is determined that the area Si of the real-time low-temperature surface is less than Smax (threshold), then proceed to step 11 to further determine the situation of the rate of change of the low-temperature surface Δsi.

[0233] Step 10b: If it is determined that the area Si of the real-time low-temperature surface does not meet the threshold of Smax, then run the internal circulation mode for m1 minutes, detect the area Si of the low-temperature surface of the insulation water receiving pan 7 and the rate of change Δsi of the area Si of the low-temperature surface of the insulation water receiving pan 7, and then execute step 7; if the current low-temperature surface is still large (not less than Smax (threshold)), the internal circulation mixed air mode needs to be continuously executed to carry out condensation prevention treatment.

[0234] Step 11: Following step 10a, further determine whether the real-time low-temperature surface change rate Δsi ≤ c (threshold) is satisfied: if yes, proceed to step 11a; otherwise, proceed to step 11b.

[0235] Step 11a: If the real-time low temperature surface change rate Δsi ≤ c (threshold) is satisfied, then maintain the current state for m2 minutes and return to step 2; the current low temperature surface change is relatively stable, and the prevention and decondensation implementation plan is reasonable, so it continues to run.

[0236] Step 11b: If the real-time low-temperature surface change rate Δsi ≤ c (threshold) is not satisfied, then proceed to step 12 to further determine the change of the area Si of the low-temperature surface of the current continuous detection insulated water receiving pan 7.

[0237] In the present invention, a composite adjustment and control method using a box-type fan coil unit is adopted to monitor the relative humidity of the return air and simultaneously monitor the pre-condensation area on the outer surface of the water receiving pan component. When the relative humidity of the air enters the threshold range, the matching graded mixing ratio is selected according to the subdivided threshold to gradedly regulate the condensation area of ​​the insulated water receiving pan 7, and then the regulation effect (i.e., the change in the area of ​​the low temperature region) is followed up to determine further adjustment strategies (such as upgrading or downgrading adjustment or maintaining), thereby realizing the regulation of condensation generation conditions by mixing air volume, reducing or avoiding condensation on the surface of the water receiving pan.

[0238] In some embodiments, the control unit 104 controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. The control unit further includes a second process: controlling at least one of the return air vent valve, the outlet air vent valve, the mixing air vent valve, and the speed of the fan based on the area of ​​the low-temperature surface of the drip tray, as detailed below:

[0239] The control unit 104 is further configured to record the area of ​​the low-temperature surface of the water receiving tray obtained in the current detection cycle as the current value of the area of ​​the low-temperature surface of the water receiving tray; and to record the area of ​​the low-temperature surface of the water receiving tray obtained in the previous detection cycle as the previous value of the area of ​​the low-temperature surface of the water receiving tray; the previous detection cycle is the cycle preceding the current detection cycle. The specific functions and processing of this control unit 104 are further described in step S710.

[0240] The control unit 104 is further configured to, when determining that the temperature of the motor is less than the maximum allowable temperature of the motor and that the indoor relative humidity of the air conditioning system is within a set humidity range, after controlling the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, and the opening degree when opening them, so that the fan coil unit operates in a preset proportional mixing air supply mode for a second set time, and if determining that the area of ​​the low-temperature surface of the water collection tray is less than a first set area, if determining that the rate of change of the area of ​​the low-temperature surface of the water collection tray is greater than a first set rate of change, then determining whether the current value of the area of ​​the low-temperature surface of the water collection tray is less than the previous value of the area of ​​the low-temperature surface of the water collection tray. The specific functions and processing of this control unit 104 are also described in step S720.

[0241] The control unit 104 is further configured to, if it is determined that the current value of the area of ​​the low-temperature surface of the water receiving tray is less than the previous value of the area of ​​the low-temperature surface of the water receiving tray, control the fan to reduce the fan speed to a preset level for a second set time, and then return to re-control the air conditioning system to operate at the target temperature and humidity for an initial set time; or control the opening of the mixing air outlet valve to reduce the opening by a preset level, causing the fan coil to operate in a preset proportional mixing air supply mode for a second set time, and then return to re-control the air conditioning system to operate at the target temperature and humidity for an initial set time; wherein, the preset level is such as level 1, and the preset opening is such as level 1 mixing opening K. The specific functions and processing of this control unit 104 are also described in step S730.

[0242] The control unit 104 is further configured to, if it is determined that the current value of the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the previous value of the area of ​​the low-temperature surface of the water receiving tray, control the fan to increase the fan speed to a preset level and run for a second preset time, and then return to re-control the air conditioning system to run at the target temperature and humidity for the initial preset time; or control the opening of the mixing air valve to increase the opening to a preset level and then make the fan coil run in a preset proportional mixing air supply mode for a second preset time, and then return to re-control the air conditioning system to run at the target temperature and humidity for the initial preset time. The specific functions and processing of this control unit 104 are further described in step S740.

[0243] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0244] Step 12: Following step 11b, determine whether the area Si of the current low-temperature surface is less than S. i-1 If yes, proceed to step 12a; otherwise, proceed to step 12b. Where S... i-1 It is the area Si of the low-temperature surface detected in the previous detection cycle.

[0245] Step 12a: If it is determined that the area Si of the current low-temperature surface is less than S i-1 If the fan speed is reduced by 1 level or the mixing air opening is reduced by 1 level K, run for m2 minutes, and then return to step 2; the current low temperature surface is much smaller than the previous condensation surface, indicating that the implementation of the prevention and decondensation plan is unreasonable (too large), so the excessive capacity is reduced by lowering the fan speed, thereby adjusting the implementation strategy.

[0246] Step 12b: If it is determined that the area Si of the current low-temperature surface does not satisfy S... i-1 If the fan speed is increased by 1 level or the mixing air opening K is increased by 1 level, run for m2 minutes, and then return to step 2; the current low temperature surface is much larger than the previous condensation surface, indicating that the implementation of the prevention and decondensation plan is unreasonable (too small), so the capacity is increased by increasing the fan speed, thereby adjusting the implementation strategy.

[0247] In the solution of this invention, a composite adjustment and control method of box-type fan coil unit is adopted. During the operation of the fan coil unit, the real-time air humidity is detected, and then compared with the actual situation for classified control. Through box-type internal circulation, external circulation, proportional air mixing and autonomous adjustment strategies, the condensation control and treatment of water tray, electrical temperature rise control and indoor air conditioning are met under different temperature and humidity conditions, taking into account both comfort requirements and equipment operating environment requirements.

[0248] In some embodiments, the control unit 104 controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. The control unit further includes a third process of controlling at least one of the speeds of the return air vent valve, the outlet air vent valve, the mixing air vent valve, and the fan based on the area of ​​the low-temperature surface of the drip tray, as detailed below:

[0249] The control unit 104 is further configured to, after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, and the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode for a third preset time, or, after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, and the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode and the fan operates at a preset lowest speed for a first preset time, determine the rate of change of the area of ​​the low-temperature surface of the water receiving tray within a preset detection period based on the area of ​​the low-temperature surface of the water receiving tray, and record it as the rate of change of the area of ​​the low-temperature surface of the water receiving tray; wherein, the rate of change of the area of ​​the low-temperature surface of the water receiving tray is like the rate of change of the area Si of the low-temperature surface of the real-time heat preservation water receiving tray 7, Δsi. The specific functions and processing of this control unit 104 are also described in step S810.

[0250] The control unit 104 is further configured to determine whether the rate of change of the area of ​​the low-temperature surface of the water receiving tray is less than or equal to a second preset rate of change; wherein the second preset rate of change is, for example, lmin. The specific functions and processing of the control unit 104 are further described in step S820.

[0251] The control unit 104 is further configured to, if it is determined that the rate of change of the area of ​​the low-temperature surface of the water receiving tray is less than or equal to a second preset rate of change, control the fan to increase its speed to a preset level and run for a fourth preset time, and then return to re-determine whether the rate of change of the area of ​​the low-temperature surface of the water receiving tray is less than or equal to the second preset rate of change. The specific functions and processing of this control unit 104 are further described in step S830.

[0252] The control unit 104 is further configured to determine whether the area of ​​the low-temperature surface of the water receiving tray is less than a second preset area if the rate of change of the area of ​​the low-temperature surface of the water receiving tray is greater than a second preset rate of change; wherein the second preset area is Smin (threshold). The specific functions and processing of the control unit 104 are further described in step S840.

[0253] The control unit 104 is further configured to, if it is determined that the area of ​​the low-temperature surface of the water tray is less than the second preset area, return to re-control the air conditioning system to operate at the target temperature and humidity for the initial preset time. The specific functions and processing of this control unit 104 are further described in step S850.

[0254] The control unit 104 is further configured to, if it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to a second preset area, return to continue controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode for a third preset time. The specific functions and processing of this control unit 104 are further described in step S860.

[0255] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0256] Step 7: Following steps 6a and 6b, further determine whether the change rate of the low-temperature surface area Si of the real-time heat preservation water receiving pan 7, i.e., the change rate of the low-temperature surface Δsi ≤ Lmin (threshold), is satisfied: if so, proceed to step 7a; otherwise, proceed to step 7b.

[0257] Step 7a: If it is determined that the change rate of the low-temperature surface area Si of the real-time heat preservation water receiving pan 7 is Δsi, i.e., the change rate of the low-temperature surface Δsi ≤ Lmin (threshold), then increase the fan speed by 1 level and run for m4 minutes, then return to step 7. Under the current internal circulation state, the condensation surface decreases slowly. Increasing the fan speed by 1 level can accelerate the reduction and elimination of condensation.

[0258] Step 7b: If it is determined that the change rate Δsi of the low-temperature surface area Si of the real-time insulation water receiving pan 7 is not satisfied, i.e., the change rate Δsi of the low-temperature surface is ≤ Lmin (threshold), then step 8 is executed to further determine the area Si of the low-temperature surface of the real-time insulation water receiving pan 7.

[0259] Step 8: Following step 7b, further determine whether the area Si of the real-time low-temperature surface is less than Smin (threshold): if yes, proceed to step 8a; otherwise, proceed to step 8b.

[0260] Step 8a: If it is determined that the area Si of the real-time low-temperature surface is less than Smin (threshold), then return to step 2.

[0261] Step 8b: If it is determined that the area Si of the real-time low-temperature surface does not meet the threshold of Smin, then return to step 6a.

[0262] In the present invention, a composite regulation and control method using a box-type fan coil unit is adopted to monitor the relative humidity of the return air. When the relative humidity of the return air is too high (i.e., when the high humidity threshold is reached), the internal circulation operation mode is activated. Through the continuous cooling and dehumidification effect of the circulating air, the condensation on the outer surface of the water receiving pan is gradually removed. Then, by detecting the change in condensation, a further adjustment strategy (upgrading or downgrading) is determined. Furthermore, when the condensation on the water receiving pan reaches the exit threshold, the unit can enter the mixed air or external circulation mode for regulation, thereby realizing the regulation of condensation generation during unit operation under different relative humidity conditions.

[0263] In some embodiments, the control unit 104 controls the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when open, and / or controls the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the drip tray, and the temperature of the motor. The control unit further includes a fourth process: controlling at least one of the speeds of the return air vent valve, the outlet air vent valve, the mixing air vent valve, and the fan based on the area of ​​the low-temperature surface of the drip tray, as detailed below:

[0264] The control unit 104 is further configured to, after controlling the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, and the degree of opening when opening, so that the fan coil unit operates in a preset external circulation air supply mode for a fourth set time, determine whether the area of ​​the low-temperature surface of the water receiving tray is less than a first set area; wherein the first set area is Smax (threshold). The specific functions and processing of this control unit 104 are further described in step S910.

[0265] The control unit 104 is further configured to, if it is determined that the area of ​​the low-temperature surface of the water tray is less than the first set area, return to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time. The specific functions and processing of this control unit 104 are further described in step S920.

[0266] The control unit 104 is further configured to, if it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to a first preset area, continue to control the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset internal circulation air supply mode, and controls the fan to operate at the preset lowest speed for a first preset time. The specific functions and processing of this control unit 104 are further described in step S930.

[0267] like Figure 15 As shown, the composite adjustment and control method for box-type fan coil units also includes:

[0268] In step 6b, if it is determined that the real-time relative humidity is not met... (High humidity threshold) After running in external circulation mode for m4 minutes, the area Si of the low temperature surface of the insulated water tray 7 is detected. Then it is determined whether the real-time low temperature surface area Si < Smax (threshold) is met: if so, return to step 2; otherwise, run in internal circulation mode and run at low speed for m1 minutes, and detect the area Si of the low temperature surface of the insulated water tray 7 and the rate of change Δsi of the area Si of the low temperature surface of the insulated water tray 7. Then execute step 7. When the humidity is low, the possibility of condensation is very low. The control of cooling and dehumidification by the surface cooler component 4 does not need to be used to control the generation of condensation outside the water tray. Instead, it is directly vented to the room for indoor air conditioning.

[0269] In the present invention, the composite adjustment and control method of the box-type fan coil unit in the air conditioning system is as follows: through box-type internal circulation, external circulation, proportional air mixing and autonomous adjustment strategies, the condensation control and treatment of the water tray, the control of electrical temperature rise and the indoor air conditioning are met under different temperature and humidity conditions.

[0270] Since the processing and functions implemented by the device in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0271] According to an embodiment of the present invention, an air conditioning system corresponding to a control device for a fan coil unit is also provided. This air conditioning system may include the control device for the fan coil unit described above.

[0272] Since the processing and functions implemented by the air conditioning system in this embodiment are basically the same as those of the aforementioned device embodiments, principles and examples, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0273] According to an embodiment of the present invention, a computer program product corresponding to the control method of an air conditioning system is also provided, including a computer program that, when executed by a processor, implements the steps of the control method of the air conditioning system described above.

[0274] Since the processing and functions implemented by the product in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in the description of this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0275] According to an embodiment of the present invention, a storage medium corresponding to a control method for an air conditioning system is also provided. The storage medium includes a stored program, wherein, when the program is executed, the device where the storage medium is located executes the steps of the control method for the air conditioning system described above.

[0276] Since the processing and functions implemented by the storage medium in this embodiment are basically the same as the embodiments, principles and examples of the aforementioned methods, any details not covered in this embodiment can be found in the relevant descriptions in the aforementioned embodiments, and will not be repeated here.

[0277] In summary, it is readily understood by those skilled in the art that, without conflict, the aforementioned advantageous methods can be freely combined and superimposed.

[0278] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that, The air conditioning system has a fan coil unit, and a closed housing is provided around the fan coil unit; the fan coil unit has a fan, a water receiving tray, a motor, a return air inlet, an air outlet, and a mixing air inlet; a return air inlet valve is provided at the return air inlet, an air outlet valve is provided at the air outlet, and a mixing air inlet valve is provided at the mixing air inlet; the mixing air inlet transports a portion of the air that has been cooled and dehumidified by the surface cooler assembly (4) of the air conditioning system through the channel where the mixing air inlet is located to the return air inlet for mixing, and then passes it to the surface cooler assembly (4) again for cooling and dehumidification; the control method of the air conditioning system includes: After the air conditioning system is turned on, control the air conditioning system to operate at the target temperature and humidity for an initial set time; The indoor relative humidity of the air conditioning system is obtained, the area of ​​the low-temperature surface of the water receiving tray is obtained, and the temperature of the motor is obtained. Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water collection tray, and the temperature of the motor, control the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or control the speed of the fan, including: Determine whether the temperature of the motor is greater than or equal to the maximum allowable temperature of the motor; If it is determined that the temperature of the motor is greater than or equal to the maximum allowable temperature of the motor, then the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, are controlled so that the fan coil unit runs in the preset internal circulation air supply mode for a first set time. Determine whether the temperature of the motor is less than or equal to the normal temperature threshold of the motor; If it is determined that the temperature of the motor is less than or equal to the normal temperature threshold of the motor, then return to the previous setting to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; If it is determined that the temperature of the motor is greater than the normal temperature threshold of the motor, then return to continue controlling the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode.

2. The control method for the air conditioning system according to claim 1, characterized in that, in, With the return air inlet valve fully open, the outlet air valve fully open, and the mixing air inlet valve closed, the fan coil unit operates in a preset external circulation air supply mode. When the return air inlet damper is fully open, the outlet air damper is fully open, and the mixing air inlet damper is opened according to the required mixing ratio, the fan coil unit operates in a preset proportional mixing air supply mode. When the return air inlet valve is closed, the outlet air valve is fully open, and the mixing air inlet valve is fully open, the fan coil unit operates in a preset internal circulation air supply mode.

3. The control method for the air conditioning system according to claim 1 or 2, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: If the temperature of the motor is determined to be less than the maximum allowable temperature of the motor, determine whether the indoor relative humidity of the air conditioning system is within the set humidity range; If the indoor relative humidity of the air conditioning system is determined to be within the set humidity range, the opening and closing of the return air vent valve, the air outlet valve, and the mixing air vent valve, as well as the opening degree when opening, are controlled so that the fan coil unit operates in a preset proportional mixing air supply mode for a second set time.

4. The control method for the air conditioning system according to claim 3, characterized in that, Set the humidity range, including: a first interval, a second interval, and a third interval where the humidity value increases sequentially; Controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in a preset proportional mixing air supply mode for a second set time, including: Determine the range within which the indoor relative humidity of the air conditioning system falls within the set humidity range; If the indoor relative humidity of the air conditioning system is determined to be within the first range, the opening degree of the air mixing outlet valve is controlled to be the first set opening degree so that the fan coil unit operates in the preset proportional air mixing and air supply mode for the second set time. If the indoor relative humidity of the air conditioning system is determined to be within the second range, the opening degree of the air mixing outlet valve is controlled to be the second preset opening degree so that the fan coil unit operates in the preset proportional air mixing and air supply mode for the second preset time. If the indoor relative humidity of the air conditioning system is determined to be within the third range, the opening degree of the mixing air outlet valve is controlled to the third preset opening degree so that the fan coil unit operates in the preset proportional mixing air supply mode for the second preset time.

5. The control method for the air conditioning system according to any one of claims 1, 2, and 4, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: If it is determined that the temperature of the motor is less than the maximum allowable temperature of the motor and the indoor relative humidity of the air conditioning system is not within the set humidity range, then it is determined whether the indoor relative humidity of the air conditioning system is less than or equal to the lower limit of the set humidity range, and whether the indoor relative humidity of the air conditioning system is greater than or equal to the upper limit of the set humidity range. If it is determined that the indoor relative humidity of the air conditioning system is greater than or equal to the upper limit of the set humidity range, then the opening and closing of the return air valve, the air outlet valve and the mixing air valve, as well as the opening degree when opening, are controlled so that the fan coil unit runs the preset internal circulation air supply mode for the third set time. If it is determined that the indoor relative humidity of the air conditioning system is less than or equal to the lower limit of the set humidity range, then the opening and closing of the return air valve, the air outlet valve, and the mixing air valve, as well as the opening degree when opening, are controlled so that the fan coil unit operates in the preset external circulation air supply mode for the fourth set time.

6. The control method for the air conditioning system according to claim 3, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: If it is determined that the temperature of the motor is less than the maximum allowable temperature of the motor and the indoor relative humidity of the air conditioning system is not within the set humidity range, then it is determined whether the indoor relative humidity of the air conditioning system is less than or equal to the lower limit of the set humidity range, and whether the indoor relative humidity of the air conditioning system is greater than or equal to the upper limit of the set humidity range. If it is determined that the indoor relative humidity of the air conditioning system is greater than or equal to the upper limit of the set humidity range, then the opening and closing of the return air valve, the air outlet valve and the mixing air valve, as well as the opening degree when opening, are controlled so that the fan coil unit runs the preset internal circulation air supply mode for the third set time. If it is determined that the indoor relative humidity of the air conditioning system is less than or equal to the lower limit of the set humidity range, then the opening and closing of the return air valve, the air outlet valve, and the mixing air valve, as well as the opening degree when opening, are controlled so that the fan coil unit operates in the preset external circulation air supply mode for the fourth set time.

7. The control method for an air conditioning system according to any one of claims 1, 2, 4, and 6, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: After controlling the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset proportional mixing air supply mode for a second set time, the rate of change of the area of ​​the low-temperature surface of the water receiving tray during the set detection period is determined based on the area of ​​the low-temperature surface of the water receiving tray, and recorded as the rate of change of the area of ​​the low-temperature surface of the water receiving tray. Determine whether the area of ​​the low-temperature surface of the water receiving tray is less than the first set area; If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the first set area, then the opening and closing of the return air valve, the air outlet valve and the mixing air valve, as well as the opening degree when opening, are controlled so that the fan coil unit runs in a preset internal circulation air supply mode and the fan is controlled to run at the preset lowest gear for a first set time. If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the first set area, then it is determined whether the rate of change of the area of ​​the low-temperature surface of the water receiving tray is less than or equal to the first set rate of change. If it is determined that the rate of change of the low-temperature surface of the water receiving pan is less than or equal to the first set rate of change, then the air conditioning system is controlled to maintain the current operating state for a second set time, and then the process is repeated to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time.

8. The control method for an air conditioning system according to claim 3, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: After controlling the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset proportional mixing air supply mode for a second set time, the rate of change of the area of ​​the low-temperature surface of the water receiving tray during the set detection period is determined based on the area of ​​the low-temperature surface of the water receiving tray, and recorded as the rate of change of the area of ​​the low-temperature surface of the water receiving tray. Determine whether the area of ​​the low-temperature surface of the water receiving tray is less than the first set area; If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the first set area, then the opening and closing of the return air valve, the air outlet valve and the mixing air valve, as well as the opening degree when opening, are controlled so that the fan coil unit runs in a preset internal circulation air supply mode and the fan is controlled to run at the preset lowest gear for a first set time. If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the first set area, then it is determined whether the rate of change of the area of ​​the low-temperature surface of the water receiving tray is less than or equal to the first set rate of change. If it is determined that the rate of change of the low-temperature surface of the water receiving pan is less than or equal to the first set rate of change, then the air conditioning system is controlled to maintain the current operating state for a second set time, and then the process is repeated to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time.

9. The control method for an air conditioning system according to claim 5, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: After controlling the opening and closing of the return air valve, the outlet air valve, and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset proportional mixing air supply mode for a second set time, the rate of change of the area of ​​the low-temperature surface of the water receiving tray during the set detection period is determined based on the area of ​​the low-temperature surface of the water receiving tray, and recorded as the rate of change of the area of ​​the low-temperature surface of the water receiving tray. Determine whether the area of ​​the low-temperature surface of the water receiving tray is less than the first set area; If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the first set area, then the opening and closing of the return air valve, the air outlet valve and the mixing air valve, as well as the opening degree when opening, are controlled so that the fan coil unit runs in a preset internal circulation air supply mode and the fan is controlled to run at the preset lowest gear for a first set time. If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the first set area, then it is determined whether the rate of change of the area of ​​the low-temperature surface of the water receiving tray is less than or equal to the first set rate of change. If it is determined that the rate of change of the low-temperature surface of the water receiving pan is less than or equal to the first set rate of change, then the air conditioning system is controlled to maintain the current operating state for a second set time, and then the process is repeated to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time.

10. The control method for an air conditioning system according to claim 7, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: The area of ​​the low-temperature surface of the water receiving tray obtained in the current detection cycle is recorded as the current value of the area of ​​the low-temperature surface of the water receiving tray; the area of ​​the low-temperature surface of the water receiving tray obtained in the previous detection cycle is recorded as the previous value of the area of ​​the low-temperature surface of the water receiving tray. If it is determined that the rate of change of the area of ​​the low-temperature surface of the water receiving tray is greater than the first set rate of change, then it is determined whether the current value of the area of ​​the low-temperature surface of the water receiving tray is less than the previous value of the area of ​​the low-temperature surface of the water receiving tray. If it is determined that the current value of the area of ​​the low-temperature surface of the water receiving tray is less than the previous value of the area of ​​the low-temperature surface of the water receiving tray, then the fan speed is controlled to be reduced to a preset level for a second set time, and then the process is returned to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; or the opening of the mixing air outlet valve is controlled to be reduced to a preset opening level so that the fan coil unit operates in a preset proportional mixing air supply mode for a second set time, and then the process is returned to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time. If it is determined that the current value of the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the previous value of the area of ​​the low-temperature surface of the water receiving tray, then the fan speed is controlled to increase to a preset level and run for a second preset time, and then the system is returned to be controlled to run the air conditioning system at the target temperature and humidity for the initial preset time; or the opening of the mixing air valve is controlled to increase to a preset opening level and then the fan coil is run in a preset proportional mixing air supply mode for a second preset time, and then the system is returned to be controlled to run the air conditioning system at the target temperature and humidity for the initial preset time.

11. The control method for an air conditioning system according to claim 8 or 9, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: The area of ​​the low-temperature surface of the water receiving tray obtained in the current detection cycle is recorded as the current value of the area of ​​the low-temperature surface of the water receiving tray; the area of ​​the low-temperature surface of the water receiving tray obtained in the previous detection cycle is recorded as the previous value of the area of ​​the low-temperature surface of the water receiving tray. If it is determined that the rate of change of the area of ​​the low-temperature surface of the water receiving tray is greater than the first set rate of change, then it is determined whether the current value of the area of ​​the low-temperature surface of the water receiving tray is less than the previous value of the area of ​​the low-temperature surface of the water receiving tray. If it is determined that the current value of the area of ​​the low-temperature surface of the water receiving tray is less than the previous value of the area of ​​the low-temperature surface of the water receiving tray, then the fan speed is controlled to be reduced to a preset level for a second set time, and then the process is returned to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; or the opening of the mixing air outlet valve is controlled to be reduced to a preset opening level so that the fan coil unit operates in a preset proportional mixing air supply mode for a second set time, and then the process is returned to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time. If it is determined that the current value of the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the previous value of the area of ​​the low-temperature surface of the water receiving tray, then the fan speed is controlled to increase to a preset level and run for a second preset time, and then the system is returned to be controlled to run the air conditioning system at the target temperature and humidity for the initial preset time; or the opening of the mixing air valve is controlled to increase to a preset opening level and then the fan coil is run in a preset proportional mixing air supply mode for a second preset time, and then the system is returned to be controlled to run the air conditioning system at the target temperature and humidity for the initial preset time.

12. The control method for an air conditioning system according to any one of claims 1, 2, 4, and 6, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: After controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode for a third set time, or after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode and the fan is controlled to operate at the preset lowest gear for a first set time, the change rate of the area of ​​the low temperature surface of the water receiving tray during the set detection period is determined based on the area of ​​the low temperature surface of the water receiving tray, and recorded as the change rate of the area of ​​the low temperature surface of the water receiving tray; Determine whether the rate of change of the low-temperature surface of the water receiving tray is less than or equal to the second set rate of change; If it is determined that the area change rate of the low-temperature surface of the water receiving tray is less than or equal to the second set change rate, then the fan speed is controlled to be increased to a preset level and run for a fourth set time, and then the process is returned to re-determine whether the area change rate of the low-temperature surface of the water receiving tray is less than or equal to the second set change rate. If it is determined that the rate of change of the area of ​​the low-temperature surface of the water receiving tray is greater than the second set rate of change, then it is determined whether the area of ​​the low-temperature surface of the water receiving tray is less than the second set area. If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the second set area, then return to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the second set area, then return to continue controlling the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset internal circulation air supply mode for the third set time.

13. The control method for the air conditioning system according to claim 3, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: After controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode for a third set time, or after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode and the fan is controlled to operate at the preset lowest gear for a first set time, the change rate of the area of ​​the low temperature surface of the water receiving tray during the set detection period is determined based on the area of ​​the low temperature surface of the water receiving tray, and recorded as the change rate of the area of ​​the low temperature surface of the water receiving tray; Determine whether the rate of change of the low-temperature surface of the water receiving tray is less than or equal to the second set rate of change; If it is determined that the area change rate of the low-temperature surface of the water receiving tray is less than or equal to the second set change rate, then the fan speed is controlled to be increased to a preset level and run for a fourth set time, and then the process is returned to re-determine whether the area change rate of the low-temperature surface of the water receiving tray is less than or equal to the second set change rate. If it is determined that the rate of change of the area of ​​the low-temperature surface of the water receiving tray is greater than the second set rate of change, then it is determined whether the area of ​​the low-temperature surface of the water receiving tray is less than the second set area. If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the second set area, then return to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the second set area, then return to continue controlling the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset internal circulation air supply mode for the third set time.

14. The control method for an air conditioning system according to claim 5, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: After controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode for a third set time, or after controlling the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, so that the fan coil unit operates in the preset internal circulation air supply mode and the fan is controlled to operate at the preset lowest gear for a first set time, the change rate of the area of ​​the low temperature surface of the water receiving tray during the set detection period is determined based on the area of ​​the low temperature surface of the water receiving tray, and recorded as the change rate of the area of ​​the low temperature surface of the water receiving tray; Determine whether the rate of change of the low-temperature surface of the water receiving tray is less than or equal to the second set rate of change; If it is determined that the area change rate of the low-temperature surface of the water receiving tray is less than or equal to the second set change rate, then the fan speed is controlled to be increased to a preset level and run for a fourth set time, and then the process is returned to re-determine whether the area change rate of the low-temperature surface of the water receiving tray is less than or equal to the second set change rate. If it is determined that the rate of change of the area of ​​the low-temperature surface of the water receiving tray is greater than the second set rate of change, then it is determined whether the area of ​​the low-temperature surface of the water receiving tray is less than the second set area. If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the second set area, then return to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the second set area, then return to continue controlling the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset internal circulation air supply mode for the third set time.

15. The control method for an air conditioning system according to any one of claims 1, 2, 4, and 6, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: After controlling the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset external circulation air supply mode for a fourth set time, it is determined whether the area of ​​the low temperature surface of the water receiving tray is less than the first set area. If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the first set area, then return to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the first set area, then the opening and closing of the return air valve, the air outlet valve and the mixing air valve, as well as the opening degree when opening, are controlled to make the fan coil unit run in the preset internal circulation air supply mode, and the fan is controlled to run at the preset lowest gear for the first set time.

16. The control method for an air conditioning system according to claim 3, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: After controlling the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset external circulation air supply mode for a fourth set time, it is determined whether the area of ​​the low temperature surface of the water receiving tray is less than the first set area. If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the first set area, then return to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the first set area, then the opening and closing of the return air valve, the air outlet valve and the mixing air valve, as well as the opening degree when opening, are controlled to make the fan coil unit run in the preset internal circulation air supply mode, and the fan is controlled to run at the preset lowest gear for the first set time.

17. The control method for an air conditioning system according to claim 5, characterized in that, Based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water receiving pan, and the temperature of the motor, the system further controls the opening and closing of the return air inlet valve, the outlet air valve, and the mixing air inlet valve, as well as the opening degree when opening, and / or controls the speed of the fan, and also includes: After controlling the opening and closing of the return air valve, the outlet air valve and the mixing air valve, as well as the opening degree when opening, so that the fan coil unit runs the preset external circulation air supply mode for a fourth set time, it is determined whether the area of ​​the low temperature surface of the water receiving tray is less than the first set area. If it is determined that the area of ​​the low-temperature surface of the water receiving tray is less than the first set area, then return to re-control the air conditioning system to operate at the target temperature and humidity for the initial set time; If it is determined that the area of ​​the low-temperature surface of the water receiving tray is greater than or equal to the first set area, then the opening and closing of the return air valve, the air outlet valve and the mixing air valve, as well as the opening degree when opening, are controlled to make the fan coil unit run in the preset internal circulation air supply mode, and the fan is controlled to run at the preset lowest gear for the first set time.

18. A control device for an air conditioning system, wherein the control method for the fan coil unit as described in any one of claims 1 to 17 is used for control, characterized in that, The air conditioning system has a fan coil unit, and a closed housing is provided around the fan coil unit; the fan coil unit has a fan, a water collection tray, a motor, a return air inlet, an air outlet, and a mixing air inlet; a return air inlet damper is provided at the return air inlet, an air outlet damper is provided at the air outlet, and a mixing air inlet damper is provided at the mixing air inlet; the control device of the air conditioning system includes: The control unit is configured to control the air conditioning system to operate at the target temperature and humidity for an initial set time after the air conditioning system is turned on; The acquisition unit is configured to acquire the indoor relative humidity of the air conditioning system, acquire the area of ​​the low-temperature surface of the water receiving tray, and acquire the temperature of the motor; The control unit is further configured to control the opening and closing of the return air vent valve, the outlet air vent valve, and the mixing air vent valve, as well as the opening degree when opening, and / or control the speed of the fan, based on at least one of the indoor relative humidity of the air conditioning system, the area of ​​the low-temperature surface of the water tray, and the temperature of the motor.

19. An air conditioning system, characterized in that, include: The control device for the fan coil unit as described in claim 18.

20. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, the device containing the storage medium is controlled to perform the control method of the air conditioning system according to any one of claims 1 to 17.

21. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the air conditioning system according to any one of claims 1 to 17.

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