An air conditioning system and a reheat dehumidification control method of an air conditioning system

Abstract

The application discloses an air conditioning system and a reheating dehumidification control method of the air conditioning system, relates to the technical field of air conditioning, and is beneficial to improving user experience. The air conditioning system comprises a reheating dehumidification circulation flow path, an outdoor fan, an indoor temperature sensor, an outdoor temperature sensor, an air outlet temperature sensor and a controller, and the reheating dehumidification circulation flow path comprises a compressor, an outdoor heat exchanger, a first throttling device, a first indoor heat exchanger, a second throttling device and a second indoor heat exchanger which are sequentially connected. The controller is configured to: when the air conditioning system enters a reheating dehumidification mode, control the first throttling device to be fully opened and the second throttling device to start throttling; when the air conditioning system operates in the reheating dehumidification mode, according to the size relationship between an indoor environment temperature Tr and an outdoor environment temperature To, a corresponding target air outlet temperature T 目标 is obtained; and according to the relationship between an actual air outlet temperature T 实际 and the target air outlet temperature T 目标 , the rotating speed of the outdoor fan is adjusted. The air conditioning system is used for constant-temperature dehumidification.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioning system and a method for controlling reheat and dehumidification in an air conditioning system. Background Technology

[0002] In related technologies, when an air conditioning system operates in reheat dehumidification mode, the indoor air outlet temperature remains constant. However, when there is a temperature difference between the outdoor and indoor environments, the indoor temperature is affected by the outdoor temperature. For example, when the outdoor temperature is higher than the indoor temperature, the outdoor environment imposes a heat load on the indoor environment, causing the indoor temperature to rise because the indoor air outlet temperature is constant. Conversely, when the outdoor temperature is lower than the indoor temperature, the outdoor environment imposes a cooling load on the indoor environment, causing the indoor temperature to decrease because the indoor air outlet temperature is constant. This fluctuation in indoor temperature prevents the system from meeting the user's preset indoor temperature. To maintain the constant temperature required for the air conditioning system in reheat dehumidification mode, the system needs to switch to either cooling or heating mode, and then switch back to reheat dehumidification mode once the preset indoor temperature is achieved. This increases the power consumption of the air conditioning system and reduces the user experience. Summary of the Invention

[0003] Embodiments of the present invention provide an air conditioning system and a reheat dehumidification control method for the air conditioning system, which is beneficial to improving the user experience.

[0004] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0005] This application provides an air conditioning system, including: a reheat dehumidification circulation path, the reheat dehumidification circulation path including a compressor, an outdoor heat exchanger, a first throttling device, a first indoor heat exchanger, a second throttling device, and a second indoor heat exchanger connected in sequence; wherein, in the indoor air outlet direction, the second indoor heat exchanger is located upstream of the first indoor heat exchanger; an outdoor fan is located on one side of the outdoor heat exchanger; an indoor temperature sensor is used to detect the indoor ambient temperature Tr of the air conditioning system; an outdoor temperature sensor is used to detect the outdoor ambient temperature To of the air conditioning system; and an outlet air temperature sensor is used to detect the actual outlet air temperature T. 实际 The controller is configured to: when the air conditioning system enters reheat dehumidification mode, control the first throttling device to be fully open and the second throttling device to start throttling; when the air conditioning system is running reheat dehumidification mode, obtain the corresponding target outlet air temperature T according to the relationship between the indoor ambient temperature Tr and the outdoor ambient temperature To. 目标 According to the actual outlet air temperature T 实际 and the target outlet air temperature T目标 The relationship between the outdoor fan and the outdoor fan speed is adjusted accordingly.

[0006] The air conditioning system provided in this application embodiment, when the air conditioning system is running in reheat dehumidification mode, obtains the corresponding target outlet air temperature T target based on the relationship between the indoor ambient temperature Tr and the outdoor ambient temperature To, and then adjusts the speed of the outdoor fan to adjust the actual outlet air temperature T actual based on the relationship between the actual outlet air temperature T actual and the target outlet air temperature T target. This helps to reduce the impact of the outdoor ambient temperature Tr on the indoor ambient temperature To. When the air conditioning system is running in reheat dehumidification mode, it helps to maintain a constant indoor ambient temperature, thereby avoiding the need for the air conditioning system to switch between cooling mode, heating mode and reheat dehumidification mode, reducing the power consumption of the air conditioning system and improving the user experience.

[0007] In some embodiments, the controller is configured to: if the actual outlet air temperature T 实际 <The target outlet air temperature T 目标 When the actual outlet air temperature T is reached, the speed of the outdoor fan is reduced to a first preset speed; if the actual outlet air temperature T is reached... 实际 =The target outlet air temperature T 目标 When the actual outlet air temperature T is high, the outdoor fan speed is kept constant; if the actual outlet air temperature T is high, the outdoor fan speed is kept constant. 实际 >The target outlet air temperature T 目标 When the outdoor fan speed is increased to the second preset speed, the speed of the outdoor fan is controlled to increase.

[0008] In some embodiments, the air conditioning system further includes: an electric auxiliary heating device located downstream of the first indoor heat exchanger in the indoor air outlet direction; the controller is configured to: when the actual air outlet temperature T 实际 <The target outlet air temperature T 目标 When the outdoor fan speed is reduced to 0, the electric auxiliary heating device is controlled to start operation.

[0009] In some embodiments, the controller is configured to: determine a user-preset indoor temperature T if the indoor ambient temperature Tr > the outdoor ambient temperature To. 预设 +ΔT1 is the target outlet air temperature T 目标 If the indoor ambient temperature Tr equals the outdoor ambient temperature To, then the user-preset indoor temperature T is determined. 预设 The target outlet air temperature T 目标 If the indoor ambient temperature Tr < the outdoor ambient temperature To, then the user-preset indoor temperature T is determined. 预设 -ΔT1 is the target outlet air temperature T 目标 Where ΔT1>0.

[0010] In some embodiments, an indoor humidity sensor is used to detect the actual indoor humidity RH; the controller is configured to adjust the operating frequency of the compressor based on the actual indoor humidity RH and a preset humidity RHs when the air conditioning system is operating in reheat dehumidification mode.

[0011] In some embodiments, the controller is configured to: control the compressor to operate at a preset initial frequency F0 when the air conditioning system enters reheat dehumidification mode; determine an adjustment coefficient K corresponding to the difference range between the actual indoor humidity RH and the preset humidity RHs when the air conditioning system is operating in reheat dehumidification mode; and adjust the operating frequency of the compressor to F0 according to the determined adjustment coefficient K. 调 ; wherein, the F 调 It is the product of the preset initial frequency F0 and the adjustment coefficient K.

[0012] In some embodiments, the controller is configured to: if ΔRH>15%, determine the adjustment coefficient K as a first preset value K1; if 10%≤ΔRH≤15%, determine the adjustment coefficient K as a second preset value K2; if 0%<ΔRH<10%, determine the adjustment coefficient K as a third preset value K3; if ΔRH≤0%, control the compressor to stop; wherein, K1>K2>K3.

[0013] In some embodiments, the air conditioning system further includes: a coil temperature sensor for detecting the coil temperature T of the second indoor heat exchanger. coi l The indoor humidity sensor is used to detect the actual indoor humidity (RH). The controller is configured to: when the air conditioning system is operating in reheat dehumidification mode, determine a target difference value corresponding to the humidity range where the actual indoor humidity (RH) is located; and determine the target difference value based on the indoor dew point temperature (Td) and the coil temperature (T) of the second indoor heat exchanger. coi l The relationship between the difference and the target difference is used to adjust the opening of the second throttling device.

[0014] In some embodiments, the controller is configured to: determine the target difference as a first set value T11 when RH≥80%; determine the target difference as a second set value T12 when 60%<RH<80%; and determine the target difference as a third set value T13 when RH≤60%; wherein T11>T12>T13.

[0015] In some embodiments, the controller is configured to: if the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger... coil When the difference between the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger is less than the target difference, the opening of the second throttling device is reduced; if the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger are less than the target difference, the opening of the second throttling device is reduced. coi l When the difference equals the target difference, the opening of the second throttling device remains unchanged; if the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger are... coi l When the difference is greater than the target difference, the opening degree of the second throttling device is increased.

[0016] In some embodiments, the controller is configured to: acquire a reheat dehumidification mode control command before controlling the air conditioning system to enter the reheat dehumidification mode; and control the air conditioning system to enter the reheat dehumidification mode when the reheat dehumidification mode control command is acquired and the air conditioning system meets a first preset condition and / or a second preset condition; wherein the first preset condition is: a user-preset indoor temperature T 预设 The relationship between the indoor ambient temperature Tr and the indoor ambient temperature Tr satisfies: Indoor ambient temperature Tr - ΔT2 ≤ User preset indoor temperature T 预设 ≤Indoor ambient temperature Tr+ΔT2; The second preset condition is: the actual indoor humidity RH is greater than or equal to the preset humidity RHs.

[0017] In some embodiments, the first throttling device includes an electronic expansion valve and a solenoid valve connected in parallel, and the controller is configured to control the solenoid valve to open when the air conditioning system is operating in reheat dehumidification mode.

[0018] In some embodiments, the heat exchange area of ​​the second indoor heat exchanger is larger than that of the first indoor heat exchanger.

[0019] This application provides a reheat dehumidification control method for an air conditioning system, applied to the aforementioned air conditioning system. The method includes: controlling the air conditioning system to enter a reheat dehumidification mode; and when the air conditioning system is operating in reheat dehumidification mode, obtaining a corresponding target outlet air temperature T based on the relationship between the indoor ambient temperature Tr and the outdoor ambient temperature To. 目标 Based on the actual outlet air temperature T 实际 and the target outlet air temperature T 目标 The relationship is adjusted to regulate the speed of the outdoor fan.

[0020] The beneficial effects of the reheat and dehumidification control method of the above-mentioned air conditioning system are the same as those of the air conditioning system described above, and will not be repeated here. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the composition of an air conditioning system provided in an embodiment of this application;

[0022] Figure 2 A schematic diagram of the cooling mode of the air conditioning system provided in the embodiments of this application;

[0023] Figure 3 A schematic diagram of the heating mode of the air conditioning system provided in the embodiments of this application;

[0024] Figure 4 A schematic diagram of the reheat dehumidification mode of the air conditioning system provided in the embodiments of this application;

[0025] Figure 5 A flowchart of a first reheat dehumidification control method for an air conditioning system provided in an embodiment of this application;

[0026] Figure 6 A flowchart of a second reheat dehumidification control method for an air conditioning system provided in an embodiment of this application;

[0027] Figure 7 Determining the target outlet air temperature T for the air conditioning system provided in this application embodiment 目标 Flowchart;

[0028] Figure 8 A flowchart illustrating the first method of adjusting the speed of an outdoor fan in an air conditioning system provided in this application embodiment;

[0029] Figure 9 A flowchart illustrating a second method for adjusting the speed of an outdoor fan in an air conditioning system provided in this application embodiment;

[0030] Figure 10 A flowchart of a third reheat dehumidification control method for an air conditioning system provided in an embodiment of this application;

[0031] Figure 11 A flowchart illustrating the adjustment of the compressor frequency in an air conditioning system provided in this application embodiment;

[0032] Figure 12 A flowchart of a fourth reheat dehumidification control method for an air conditioning system provided in an embodiment of this application;

[0033] Figure 13 A flowchart illustrating the adjustment of the opening degree of the second throttling device in an air conditioning system according to an embodiment of this application;

[0034] Figure 14 A flowchart of a fifth reheat dehumidification control method for an air conditioning system provided in an embodiment of this application.

[0035] Figure label:

[0036] 100. Air conditioning system;

[0037] 1. Compressor; 11. Inlet; 12. Outlet;

[0038] 2. Reversing assembly; 21. First valve port; 22. Second valve port; 23. Third valve port; 24. Fourth valve port;

[0039] 3. Second indoor heat exchanger; 31. First indoor heat exchanger;

[0040] 4. Outdoor heat exchanger; 41. Outdoor fan;

[0041] 5. First throttling device; 51. Electronic expansion valve; 52. Solenoid valve;

[0042] 6. Second throttling device. Detailed Implementation

[0043] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0044] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] In related technologies, when an air conditioning system operates in reheat dehumidification mode, the indoor air outlet temperature remains constant. However, when there is a temperature difference between the outdoor and indoor environments, the indoor temperature is affected by the outdoor temperature. For example, when the outdoor temperature is higher than the indoor temperature, the outdoor environment imposes a heat load on the indoor environment, causing the indoor temperature to rise because the indoor air outlet temperature is constant. Conversely, when the outdoor temperature is lower than the indoor temperature, the outdoor environment imposes a cooling load on the indoor environment, causing the indoor temperature to decrease because the indoor air outlet temperature is constant. This fluctuation in indoor temperature prevents the system from meeting the user's preset indoor temperature. To maintain the constant temperature required for the air conditioning system in reheat dehumidification mode, the system needs to switch to either cooling or heating mode, and then switch back to reheat dehumidification mode once the preset indoor temperature is achieved. This increases the power consumption of the air conditioning system and reduces the user experience.

[0048] To solve the above technical problems, when the air conditioning system is running in reheat dehumidification mode, the controller obtains the corresponding target outlet air temperature T based on the relationship between the indoor ambient temperature Tr and the outdoor ambient temperature To. 目标 Then, based on the actual outlet air temperature T 实际 and target outlet air temperature T 目标 The relationship is such that the speed of the outdoor fan is adjusted to regulate the actual outlet air temperature T. 实际 This helps reduce the impact of outdoor ambient temperature Tr on indoor ambient temperature To. When the air conditioning system operates in reheat dehumidification mode, it helps maintain a constant indoor temperature. This helps avoid switching between cooling, heating and reheat dehumidification modes, reduces the power consumption of the air conditioning system, and improves the user experience.

[0049] The air conditioning system of the present application embodiment will be described below.

[0050] Please see Figure 1 , Figure 1 This is a schematic diagram of an air conditioning system provided in an embodiment of this application. The air conditioning system 100 includes a reheat dehumidification circulation path, an outdoor fan 41, an indoor temperature sensor, an outdoor temperature sensor, an outlet air temperature sensor, and a controller.

[0051] The reheat dehumidification circulation path includes a compressor 1, an outdoor heat exchanger 4, a first throttling device 5, a first indoor heat exchanger 31, a second throttling device 6, and a second indoor heat exchanger 3 connected in sequence.

[0052] Please continue reading. Figure 1The compressor 1 has an intake port 11 and an exhaust port 12, and is connected to a controller. Specifically, the intake port 11 of the compressor 1 is used for intake, and refrigerant enters the compression chamber of the compressor 1 through the intake port 11 for compression, forming high-temperature and high-pressure refrigerant. The high-temperature and high-pressure refrigerant gas is then discharged from the compressor 1 through the exhaust port 12, and then enters the air conditioning system 100 for refrigerant circulation. For example, the compressor 1 can be a scroll compressor, rotary compressor, screw compressor, or other types of compressor.

[0053] Please continue reading. Figure 1 In the direction of indoor air intake, the second indoor heat exchanger 3 is located upstream of the first indoor heat exchanger 31, that is, air enters from the side of the second indoor heat exchanger 3 and exits from the side of the first indoor heat exchanger 31.

[0054] In some embodiments, the heat exchange area of ​​the second indoor heat exchanger 3 is larger than that of the first indoor heat exchanger 31. Since the second indoor heat exchanger 3 is used for cooling and dehumidification when the air conditioning system 100 is in reheat dehumidification mode, this increases the dehumidification capacity of the air conditioning system 100 and improves its dehumidification efficiency. For example, the heat exchange area of ​​the second indoor heat exchanger 3 can be twice that of the first indoor heat exchanger 31.

[0055] In some embodiments, a gap exists between the second indoor heat exchanger 3 and the first indoor heat exchanger 31, and the gap value can range from 5 to 10 mm. For example, the gap value can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm, etc. When the gap between the second indoor heat exchanger 3 and the first indoor heat exchanger 31 is less than 5 mm, it is easy to cause mixing of indoor hot and cold air, affecting the constant temperature and dehumidification effect of the air conditioning system 100. When the gap between the second indoor heat exchanger 3 and the first indoor heat exchanger 31 is greater than 10 mm, it is easy to affect the dehumidification effect of the air conditioning system 100.

[0056] Please continue reading. Figure 1The air conditioning system 100 also includes a reversing assembly 2, which can be connected to a controller. The reversing assembly 2 has a first valve port 21, a second valve port 22, a third valve port 23, and a fourth valve port 24. The reversing assembly 2 can be located between the compressor 1 and the outdoor heat exchanger 4. The first valve port 21 can be connected to the discharge port 12 of the compressor 1. The second valve port 22 can be connected to the first end of the second indoor heat exchanger 3. The third valve port 23 can be connected to the first end of the outdoor heat exchanger 4. The fourth valve port 24 can be connected to the suction port 11 of the compressor 1. The first valve port 21 can be switched to one of the second valve port 22 and the third valve port 23, and the fourth valve port 24 can be switched to one of the second valve port 22 and the third valve port 23. That is, when the first valve port 21 is connected to the second valve port 22, the third valve port 23 is connected to the fourth valve port 24; when the first valve port 21 is connected to the third valve port 23, the second valve port 22 is connected to the fourth valve port 24.

[0057] For example, the reversing assembly 2 can be a four-way reversing valve. When the four-way reversing valve is energized, the first valve port 21 and the second valve port 22 are connected, and the third valve port 23 and the fourth valve port 24 are connected; when the four-way reversing valve is de-energized, the first valve port 21 and the third valve port 23 are connected, and the second valve port 22 and the fourth valve port 24 are connected. Of course, it is understood that in other examples, when the four-way reversing valve is de-energized, the first valve port 21 and the second valve port 22 are connected, and the third valve port 23 and the fourth valve port 24 are connected; when the four-way reversing valve is energized, the first valve port 21 and the third valve port 23 are connected, and the second valve port 22 and the fourth valve port 24 are connected.

[0058] Please continue reading. Figure 1 In some embodiments, the first throttling device 5 includes an electronic expansion valve 51 and a solenoid valve 52 connected in parallel, both of which are connected to a controller. The solenoid valve 52 is located between the second end of the outdoor heat exchanger 4 and the second end of the first indoor heat exchanger 31, and is connected in parallel with the first throttling device 5. Therefore, by utilizing the fact that the solenoid valve 52 has no throttling effect on the refrigerant flowing through it, heat loss of the refrigerant flowing from the outdoor heat exchanger 4 to the second indoor heat exchanger 3 can be avoided, which is beneficial to improving the reheat dehumidification efficiency of the air conditioning system 100.

[0059] Please continue reading. Figure 1 The electronic expansion valve 51 can throttle and reduce the pressure of the refrigerant flowing through it. The electronic expansion valve 51 can also control the on / off connection between the second end of the outdoor heat exchanger 4 and the second end of the first indoor heat exchanger 31.

[0060] In some embodiments, the first throttling device 5 includes only an electronic expansion valve 51, which controls the electronic expansion valve 51 to be fully open when the air conditioning system 100 enters the reheat dehumidification mode.

[0061] Please continue reading. Figure 1 A second throttling device 6 is connected in series between the first end of the first indoor heat exchanger 31 and the second end of the second indoor heat exchanger 3. The second throttling device 6 is connected to the controller. The second throttling device 6 can either throttle and reduce the pressure of the refrigerant flowing through it or have no throttling effect on the refrigerant flowing through it. For example, when the second throttling device 6 is powered on, the throttling valve can throttle and reduce the pressure of the refrigerant flowing through it. When the second throttling device 6 is de-energized, the second throttling device 6 can not throttle the refrigerant flowing through it.

[0062] In some embodiments, in the indoor air outlet direction, the electric auxiliary heating device (not shown) is located downstream of the first indoor heat exchanger 31, and the electric auxiliary heating device is connected to the controller. This can improve the heating efficiency of the electric auxiliary heating device. For example, the electric auxiliary heating device can be a heating wire, resistance wire, etc.

[0063] The air conditioning system 100 according to an embodiment of this application has a cooling mode, a heating mode, and a reheat dehumidification mode. The control process and refrigerant flow direction of the cooling mode, heating mode, and reheat dehumidification mode of the air conditioning system 100 provided in this embodiment will be described in detail below.

[0064] Cooling mode

[0065] Please see Figure 2 , Figure 2 This is a schematic diagram of the cooling mode of the air conditioning system provided in the embodiment of this application. When the air conditioning system 100 is in cooling mode, the controller controls the first valve port 21 and the third valve port 23 of the reversing assembly 2 to be connected, the second valve port 22 and the fourth valve port 24 to be connected, the first throttling device 5 throttles, the solenoid valve 52 is closed, and the second throttling device 6 does not throttle.

[0066] Refrigerant Flow: The high-temperature, high-pressure gaseous refrigerant discharged from the exhaust port 12 of the compressor 1 flows to the reversing assembly 2. The refrigerant flowing to the reversing assembly 2 enters the reversing assembly 2 through the first valve port 21 and exits the reversing assembly 2 through the third valve port 23. The refrigerant flowing out of the third valve port 23 flows to the outdoor heat exchanger 4 and undergoes sufficient heat exchange to become a high-temperature, medium-pressure liquid refrigerant. Then, the refrigerant flowing out of the outdoor heat exchanger 4 flows through the first throttling device 5 to reduce its pressure and becomes a low-temperature, low-pressure two-phase refrigerant. Since the second throttling device 6 does not have a throttling effect, the refrigerant after pressure reduction flows into the first indoor heat exchanger 31 and the second indoor heat exchanger 3. After heat exchange between the second indoor heat exchanger 3 and the first indoor heat exchanger 31, it becomes a low-temperature, low-pressure gaseous refrigerant and finally flows back to the suction port 11 of the compressor 1 through the second valve port 22 and the fourth valve port 24.

[0067] Heating mode

[0068] Please see Figure 3 , Figure 3 This is a schematic diagram of the heating mode of the air conditioning system provided in the embodiment of this application. When the air conditioning system 100 is in the heating mode, the controller controls the first valve port 21 and the second valve port 22 of the reversing assembly 2 to be connected, the third valve port 23 and the fourth valve port 24 to be connected, the first throttling device 5 throttles, the solenoid valve 52 is closed, and the second throttling device 6 does not throttle.

[0069] Refrigerant Flow: The high-temperature, high-pressure gaseous refrigerant discharged from the exhaust port 12 of the compressor 1 flows to the reversing assembly 2. The refrigerant flowing to the reversing assembly 2 enters the reversing assembly 2 through the first valve port 21 and exits the reversing assembly 2 through the second valve port 22. Since the second throttling device 6 does not have a throttling effect, the refrigerant flowing out from the third valve port 23 flows to the second indoor heat exchanger 3 and the first indoor heat exchanger 31. After heat exchange in the second indoor heat exchanger 3 and the first indoor heat exchanger 31, it becomes a high-pressure, medium-temperature liquid refrigerant. Then, the refrigerant flowing out from the first indoor heat exchanger 31 and the second indoor heat exchanger 3 flows to the first throttling device 5. After being throttled and depressurized by the first throttling device 5, it becomes a low-temperature, low-pressure two-phase refrigerant. Then, the refrigerant flows from the first throttling device 5 to the outdoor heat exchanger 4, where it evaporates into a low-temperature, low-pressure gaseous refrigerant. Finally, the refrigerant flowing out of the indoor heat exchanger flows back to the suction port 11 of the compressor 1 through the third valve port 23 and the fourth valve port 24.

[0070] Reheat dehumidification mode

[0071] Please see Figure 4 , Figure 4 This is a schematic diagram of the reheat dehumidification mode of the air conditioning system provided in this application embodiment. When the air conditioning system 100 is in the reheat dehumidification mode, the controller controls the first valve port 21 and the third valve port 23 of the reversing assembly 2 to be connected, the second valve port 22 and the fourth valve port 24 to be connected, the first throttling device 5 does not throttle the refrigerant flowing through it, the solenoid valve 52 is opened, the second throttling device 6 starts throttling, the outdoor fan 41 runs at a low speed, the first indoor heat exchanger is used as an evaporator, and the second indoor heat exchanger is used as a condenser.

[0072] Refrigerant Flow: The high-temperature, high-pressure gaseous refrigerant discharged from the exhaust port 12 of the compressor 1 flows to the reversing assembly 2. The refrigerant flowing to the reversing assembly 2 enters the reversing assembly 2 through the first valve port 21 and exits the reversing assembly 2 through the third valve port 23. The refrigerant flowing out of the third valve port 23 flows to the outdoor heat exchanger 4, where it exchanges heat and becomes a medium-temperature, medium-pressure gaseous refrigerant. Then, the refrigerant flowing out of the outdoor heat exchanger 4 flows to the solenoid valve 52, which has no throttling effect. The refrigerant flowing out of the solenoid valve 52 flows to the first indoor heat exchanger 31 for heat dissipation, and then flows from the first indoor heat exchanger 31 to the second throttling device 6. After being throttled and depressurized by the second throttling device 6, it becomes a low-temperature, low-pressure liquid refrigerant and flows to the second indoor heat exchanger 3. After heat exchange in the second indoor heat exchanger 3, it becomes a low-temperature, low-pressure gaseous refrigerant, and finally flows back to the suction port 11 of the compressor 1 through the second valve port 22 and the fourth valve port 24 in sequence.

[0073] Indoor air intake process: When the air conditioning system 100 is operating in reheat dehumidification mode, the second indoor heat exchanger 3 is a low-temperature evaporator, and the first indoor heat exchanger 31 is a high-temperature condenser. The indoor air intake exchanges heat with the second indoor heat exchanger 3, which lowers the ambient temperature and causes indoor moisture to condense out as condensate, achieving the effect of cooling and dehumidification. The air flowing out of the second indoor heat exchanger 3 is cool air with low humidity. The air flowing out of the second indoor heat exchanger 3 then flows back to the first indoor heat exchanger 31, where its temperature is increased, maintaining the outlet air temperature at a constant temperature, thereby maintaining the indoor ambient temperature at a certain level.

[0074] In some embodiments, the air conditioning system 100 further includes an outdoor temperature sensor, an indoor temperature sensor, an outlet air temperature sensor, a coil temperature sensor, and a humidity sensor. All of these sensors are connected to a controller. The indoor temperature sensor detects the indoor ambient temperature Tr of the air conditioning system 100, the outdoor temperature sensor detects the outdoor ambient temperature To of the air conditioning system 100, and the outlet air temperature sensor detects the actual outlet air temperature T. 实际 The coil temperature sensor is used to detect the coil temperature T of the second indoor heat exchanger. coi l The indoor humidity sensor is used to detect the actual indoor humidity (RH).

[0075] In addition, the controller can be used to control the operation of various components inside the air conditioning system 100 so that the operation of each component of the air conditioning system 100 can realize the predetermined functions of the air conditioning system 100.

[0076] Based on the above-described structure of the air conditioning system 100, the reheat and dehumidification control method of the air conditioning system 100 according to an embodiment of this application will be described below. This method is applied to a controller, which can be the controller described above.

[0077] Please see Figure 5 , Figure 5 A flowchart illustrating a first reheat dehumidification control method for an air conditioning system provided in this application embodiment. The reheat dehumidification control method of the air conditioning system 100 includes:

[0078] S1: Control the air conditioning system 100 to enter the reheat dehumidification mode. For example, controlling the air conditioning system 100 to enter the reheat dehumidification mode can be achieved by the controller directly controlling the air conditioning system 100 to enter the reheat dehumidification mode according to the user's instructions.

[0079] S2: When the air conditioning system 100 is running in reheat dehumidification mode, the target outlet air temperature T is obtained based on the relationship between the indoor ambient temperature Tr and the outdoor ambient temperature To. 目标 .

[0080] S3: Based on the actual outlet air temperature T 实际 and target outlet air temperature T 目标 The relationship is adjusted to regulate the speed of the outdoor fan 41.

[0081] Therefore, when the air conditioning system 100 is running in reheat dehumidification mode, the controller obtains the corresponding target outlet air temperature T based on the relationship between the indoor ambient temperature Tr and the outdoor ambient temperature To. 目标 Then, based on the actual outlet air temperature T 实际 and target outlet air temperature T 目标 The relationship is such that the speed of the outdoor fan 41 is adjusted to regulate the actual outlet air temperature T. 实际 This helps reduce the impact of outdoor ambient temperature Tr on indoor ambient temperature To. When the air conditioning system 100 operates in reheat dehumidification mode, it helps maintain a constant indoor temperature, thus avoiding the need for the air conditioning system 100 to switch between cooling mode, heating mode and reheat dehumidification mode. This also helps reduce the power consumption of the air conditioning system 100 and improves the user experience.

[0082] Please see Figure 6 , Figure 6 A flowchart illustrating a second reheat dehumidification control method for an air conditioning system provided in this application embodiment. The reheat dehumidification control method for the air conditioning system 100 includes:

[0083] S1: Obtain the reheat dehumidification mode control command;

[0084] S2: When the reheat dehumidification mode control command is received, it is determined whether the air conditioning system 100 meets the first preset condition; the controller judges the first preset condition so that the air conditioning system 100 can determine whether the current environment requires the air conditioning system 100 to enter the reheat dehumidification mode. This can avoid the problem of the air conditioning system directly entering the reheat dehumidification mode affecting the user experience, and can also improve the reliability and intelligence of the air conditioning system 100.

[0085] In some embodiments, the first preset condition is: the user presets an indoor temperature T. 预设 The relationship between indoor ambient temperature Tr and the indoor ambient temperature Tr satisfies: Indoor ambient temperature Tr - ΔT2 ≤ User-preset indoor temperature T 预设 ≤Indoor ambient temperature Tr + ΔT². The controller will set the user-preset indoor temperature T. 预设 Compared with indoor ambient temperature Tr-ΔT2 and indoor ambient temperature Tr+ΔT2, this method helps improve the accuracy of the air conditioning system in determining whether the current indoor ambient temperature Tr meets the requirements for entering reheat dehumidification mode, and avoids discrepancies between the indoor ambient temperature Tr and the user-preset indoor temperature T. 预设 The significant difference between the two conditions leads to a problem where entering reheat dehumidification mode negatively impacts the user experience.

[0086] In some embodiments, the value of ΔT2 can be in the range of 3-5℃. For example, the value of ΔT2 can be 3℃, 4℃, or 5℃, etc.

[0087] S3: If the air conditioning system 100 meets the first preset condition, then determine whether the air conditioning system 100 meets the second preset condition; by judging the second preset condition through the controller, the air conditioning system 100 can determine whether the current environment requires the air conditioning system 100 to enter the reheat dehumidification mode, which can avoid the problem of the air conditioning system directly entering the reheat dehumidification mode affecting the user experience, and can also improve the reliability and intelligence of the air conditioning system 100.

[0088] In some embodiments, the second preset condition is that the actual indoor humidity RH is greater than or equal to the preset humidity RHs. This setting helps improve the reliability of the air conditioning system 100 operation and prevents the actual indoor humidity from falling below the user's preset humidity after the air conditioning system 100 enters the reheat dehumidification mode, thus improving the user experience. When the actual indoor humidity RH is less than the preset humidity RHs, the air conditioning system 100 can be controlled to standby mode.

[0089] S4: If the air conditioning system meets the second preset condition, the air conditioning system 100 is controlled to enter the reheat dehumidification mode. Thus, by determining whether the air conditioning system 100 meets the first and second preset conditions through the controller, the problem of the air conditioning system directly entering the reheat dehumidification mode and affecting the user experience can be avoided, and the reliability and intelligence of the air conditioning system 100 operation can also be improved.

[0090] In some embodiments, the controller may first determine whether the air conditioning system 100 meets the second preset condition, and then determine whether the air conditioning system 100 meets the first preset condition. In still other embodiments, the controller may simultaneously determine whether the air conditioning system 100 meets the first and second preset conditions. As long as the air conditioning system 100 meets both the first and second preset conditions when it receives the reheat dehumidification mode control command, the controller can control the air conditioning system 100 to enter the reheat dehumidification mode. Of course, it is understood that in other examples, when the air conditioning system 100 receives the reheat dehumidification mode control command, it may only determine whether the air conditioning system 100 meets the first or second preset condition before controlling the air conditioning system to enter the reheat dehumidification mode.

[0091] S5: When the air conditioning system 100 is running in reheat dehumidification mode, the target outlet air temperature T is obtained based on the relationship between the indoor ambient temperature Tr and the outdoor ambient temperature To. 目标 .

[0092] S6: Based on the actual outlet air temperature T 实际 and target outlet air temperature T 目标 The relationship is adjusted to regulate the speed of the outdoor fan 41.

[0093] Therefore, by determining whether the air conditioning system 100 meets the first and second preset conditions before entering the reheat dehumidification mode, the reliability and intelligence of the air conditioning system 100's operation are improved. Simultaneously, when the air conditioning system 100 is operating in reheat dehumidification mode, the controller obtains the corresponding target outlet air temperature T based on the relationship between the indoor ambient temperature Tr and the outdoor ambient temperature To. 目标 Then, based on the actual outlet air temperature T 实际 and target outlet air temperature T 目标 The relationship is such that the speed of the outdoor fan 41 is adjusted to regulate the actual outlet air temperature T. 实际 This helps reduce the impact of outdoor ambient temperature Tr on indoor ambient temperature To. When the air conditioning system 100 operates in reheat dehumidification mode, it helps maintain a constant indoor temperature, thus avoiding the need for the air conditioning system 100 to switch between cooling mode, heating mode and reheat dehumidification mode. This also helps reduce the power consumption of the air conditioning system 100 and improves the user experience.

[0094] Based on any of the above embodiments, please refer to Figure 7 , Figure 7 Determining the target outlet air temperature T for the air conditioning system provided in this application embodiment 目标 The flowchart illustrates this. In some embodiments, the target outlet air temperature T is obtained based on the relationship between the indoor ambient temperature Tr and the outdoor ambient temperature To. 目标 Specifically, it includes:

[0095] When the indoor ambient temperature Tr > the outdoor ambient temperature To, the target air outlet temperature T 目标 =User preset indoor temperature T 预设 +ΔT1. This setting allows for adjustments to the target outlet air temperature T when the outdoor ambient temperature To < the indoor ambient temperature Tr, and the outdoor ambient temperature To supplies a cooling load to the indoor ambient temperature Tr. 目标 This can reduce the impact of outdoor ambient temperature on indoor ambient temperature, so that after the air conditioning system 100 has been running for a long time, the indoor ambient temperature can be equal to the user's preset indoor temperature. This is beneficial to improving the constant temperature performance of the air conditioning system 100 in reheat and dehumidification mode, and also to improving the user experience.

[0096] When the indoor ambient temperature Tr = the outdoor ambient temperature To, the target air outlet temperature T 目标 =User preset indoor temperature T 预设 At this point, there is no need to set the target outlet air temperature T. 目标 Adjustments will be made.

[0097] When the indoor ambient temperature Tr < the outdoor ambient temperature To, the target air outlet temperature T 目标 =User preset indoor temperature T 预设 -ΔT1; where ΔT1 > 0. This setting allows for adjustment of the target outlet air temperature T when the indoor ambient temperature Tr < the outdoor ambient temperature To, and the outdoor ambient temperature To provides a heat load to the indoor ambient temperature Tr. 目标 This can reduce the impact of outdoor ambient temperature on indoor ambient temperature, so that after the air conditioning system 100 has been running for a long time, the indoor ambient temperature can be equal to the user's preset indoor temperature. This is beneficial to improving the constant temperature performance of the air conditioning system 100 in reheat and dehumidification mode, and also to improving the user experience.

[0098] In some embodiments, the value of ΔT1 can be in the range of 1-4℃. For example, the value of ΔT1 can be 1℃, 2℃, 3℃, or 4℃, etc.

[0099] Based on any of the above embodiments, please refer to Figure 8 , Figure 8A flowchart illustrating the adjustment of the outdoor fan speed in a first air conditioning system provided in this application embodiment. In some embodiments, the controller adjusts the speed according to the actual outlet air temperature T. 实际 and target outlet air temperature T 目标 The relationship is such that adjusting the speed of the outdoor fan 41 includes:

[0100] When the actual outlet air temperature T 实际 <Target outlet air temperature T 目标 If the outdoor fan 41 speed is reduced to the first preset speed, the system can return to the previous setting to continue judging the actual outlet air temperature T. 实际 and target outlet air temperature T 目标 The relationship is as follows. Therefore, by reducing the speed of the outdoor fan 41, the outdoor heat dissipation can be reduced, thereby reducing the actual outlet air temperature T. 实际 <Target outlet air temperature T 目标 At that time, increase the actual outlet air temperature T 实际 .

[0101] When the actual outlet air temperature T 实际 =Target outlet air temperature T 目标 When the outdoor fan 41 is at a constant speed, the actual outlet air temperature T can be kept constant. 实际 =Target outlet air temperature T 目标 .

[0102] When the actual outlet air temperature T 实际 >Target outlet air temperature T 目标 If the outdoor fan 41 speed is increased to the second preset speed, the system can return to the previous setting to continue judging the actual outlet air temperature T. 实际 and target outlet air temperature T 目标 The relationship is as follows. Therefore, by increasing the preset speed of the outdoor fan 41, the outdoor heat dissipation can be increased, thereby increasing the actual outlet air temperature T. 实际 >Target outlet air temperature T 目标 At that time, reduce the actual outlet air temperature T 实际 .

[0103] Therefore, at the actual outlet air temperature T 实际 With the target outlet air temperature T 目标 When the temperatures are not equal, the speed of the outdoor fan 41 is adjusted by the controller to achieve the target outlet air temperature T. 目标 Compared with the actual outlet air temperature T 实际Equal and simple to control, it can reduce the impact of outdoor ambient temperature Tr on indoor ambient temperature To. When the air conditioning system 100 is running in reheat dehumidification mode, it can maintain a constant indoor ambient temperature, thereby avoiding the need for the air conditioning system 100 to switch between cooling mode, heating mode and reheat dehumidification mode, which helps to reduce the power consumption of the air conditioning system 100 and improve the user experience.

[0104] In some embodiments, the first preset rotational speed can be equal to the difference between the initial rotational speed and a preset value, and the second preset rotational speed can be equal to the sum of the initial rotational speed and the preset value. The preset value can range from 10 to 70 r / min. For example, the preset value can be 10 r / min, 20 r / min, 30 r / min, 40 r / min, 50 r / min, 60 r / min, or 70 r / min, etc.

[0105] For further details, please refer to Figure 9 , Figure 9 A flowchart illustrating a second method for adjusting the speed of an outdoor fan in an air conditioning system provided in this application embodiment. In some embodiments, T 目标 <Target outlet air temperature T 目标 In the step of controlling the outdoor fan 41 to reduce its speed to the first preset speed, when the outdoor fan 41's speed drops to 0, the electric auxiliary heating device is activated. This ensures that even when the outdoor fan 41 stops rotating, the actual outlet air temperature T... 实际 The target outlet air temperature T has not yet been reached. 目标 At this time, the actual outlet air temperature T can be adjusted by controlling the start-up of the electric auxiliary heating device. 实际 Achieve target outlet air temperature T 目标 It has a simple structure and is easy to control.

[0106] Based on any of the above embodiments, please refer to Figure 10 , Figure 10 This is a flowchart illustrating a third reheat dehumidification control method for an air conditioning system provided in this application embodiment. When the air conditioning system 100 operates in reheat dehumidification mode, the operating frequency of the compressor 1 is adjusted based on the actual indoor humidity RH and the preset humidity RHs. Therefore, by adjusting the operating frequency of the compressor 1 based on the actual indoor humidity RH and the preset humidity RHs, the controller improves the dehumidification efficiency of the air conditioning system 100. The preset humidity RHs can be a user-preset humidity, for example, set by the user via a remote control or the control panel on the air conditioning system 100 through voice, buttons, or other operation methods; or the preset humidity RHs can be an optimal humidity set automatically by the air conditioning system 100 based on actual conditions to meet user comfort.

[0107] For further details, please refer to Figure 11 , Figure 11 This is a flowchart illustrating the adjustment of the compressor frequency in an air conditioning system provided in an embodiment of this application. In some embodiments, when the air conditioning system 100 is controlled to enter the reheat dehumidification mode, the compressor 1 is controlled to operate at a preset initial frequency F0. The preset initial frequency F0 can be an empirically set frequency value at which the compressor 1 is controlled to operate.

[0108] Adjusting the operating frequency of compressor 1 based on the actual indoor humidity RH and the preset humidity RHs specifically includes: determining the adjustment coefficient K corresponding to the difference range based on the difference range of the difference between the actual indoor humidity RH and the preset humidity RHs ΔRH.

[0109] After determining the adjustment coefficient corresponding to the difference range, adjust the operating frequency of compressor 1 to F. 调 Among them, F 调 This is the product of the preset initial frequency F0 and the adjustment coefficient K. This improves the dehumidification capacity of the air conditioning system 100 and helps reduce power consumption.

[0110] Please continue reading. Figure 11 In some embodiments, when △RH>15%, the adjustment coefficient K is determined to be the first preset value K1, then F 调 =F0×K1; When 10%≤△RH≤15%, the adjustment coefficient K is determined to be the second preset value K2, then F 调 =F0×K2; When 0% < ΔRH < 10%, the adjustment coefficient K is determined to be the third preset value K3, then F 调 =F0×K3; When △RH≤0%, control compressor 1 to stop; where K1>K2>K3. This setting can increase the operating frequency of compressor 1 when the indoor humidity is high and decrease the operating frequency of compressor 1 when the indoor humidity is low, so that the air conditioning system 100 can enable compressor 1 to operate in variable frequency mode when dealing with different indoor humidity levels, which is beneficial to reducing the operating power consumption of the air conditioning system 100.

[0111] For example, the value of K1 can be 1.0-0.9, the value of K2 can be 0.8-0.7, and the value of K3 can be 0-0.6.

[0112] Based on any of the above embodiments, please refer to Figure 12 , Figure 12 This is a flowchart illustrating a fourth reheat dehumidification control method for an air conditioning system provided in this application embodiment. When the air conditioning system 100 operates in reheat dehumidification mode, a target difference value corresponding to the humidity range is determined based on the actual indoor humidity RH; the target difference value is determined based on the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger 3. coilThe opening degree of the second throttling device 6 is adjusted based on the relationship between the difference between the indoor dew point temperature Td and the target difference. Thus, the opening degree of the second throttling device 6 is adjusted by considering the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger 3. coi l Adjusting the opening of the second throttling device 6 based on the relationship between the difference and the target difference is beneficial to improving the dehumidification efficiency of the air conditioning system 100.

[0113] For further details, please refer to Figure 13 , Figure 13 A flowchart illustrating the adjustment of the opening degree of the second throttling device in an air conditioning system provided in this application embodiment. In some embodiments, determining a target difference value corresponding to the humidity range based on the actual indoor humidity RH specifically includes: when RH ≥ 80%, determining the target difference value as a first set value T. 11 When 60% < RH < 80%, the target difference is determined to be the second setpoint T. 12 When RH ≤ 60%, the target difference is determined to be the third setpoint T. 13 Among them, T 11 >T 12 >T 13 The controller determines different target differences based on the different humidity ranges of the actual indoor humidity (RH), which helps improve the dehumidification capability of the air conditioning system 100 for different actual humidity levels (RH), thereby improving the dehumidification effect of the air conditioning system 100. At the same time, it also helps reduce the operating power consumption of the air conditioning system 100, making the air conditioning system 100 more reliable during operation.

[0114] For example, T 11 The value range is 15-11℃, T 12 The value range is 10-8℃, T 13 The value range is 7-4℃.

[0115] Please continue reading. Figure 13 In some embodiments, the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger 3 are used as the basis for determining the indoor dew point temperature Td. coi l The relationship between the difference and the target difference is used to adjust the opening of the second throttling device 6, specifically including:

[0116] When the indoor dew point temperature Td and the coil temperature of the second indoor heat exchanger 3 are... coi l When the difference is less than the target difference, the opening of the second throttling device 6 is reduced; after the opening of the second throttling device 6 is reduced, the system can return to continue judging the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger 3. coil The relationship between the difference and the target difference.

[0117] When the indoor dew point temperature Td and the coil temperature of the second indoor heat exchanger 3 are... coi l When the difference equals the target difference, the opening of the second throttling device 6 remains unchanged;

[0118] When the indoor dew point temperature Td and the coil temperature of the second indoor heat exchanger 3 are... coi l When the difference is greater than the target difference, the opening of the second throttling device 6 is increased. After the opening of the second throttling device 6 is increased, the system can return to continue judging the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger 3. coil The relationship between the difference and the target difference. Therefore, by comparing the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger 3. coil The relationship between the difference and the target difference is used to adjust the opening degree of the second throttling device 6 to control the amount of dehumidification so that the actual humidity RH of the air conditioning system 100 can reach the user's preset humidity RHs more quickly, so that the dehumidification effect of the air conditioning system 100 is better and it is beneficial to improve the dehumidification efficiency of the air conditioning system 100.

[0119] Please see Figure 14 , Figure 14 A flowchart illustrating a fifth reheat dehumidification control method for an air conditioning system provided in this application embodiment. In some embodiments, when the user presets an indoor temperature T... 预设 When the indoor ambient temperature is Tr-ΔT2s, the air conditioning system is controlled to enter cooling mode. When the user presets the indoor temperature T... 预设 When the indoor ambient temperature is Tr+ΔT2, the air conditioning system is set to 100°C and enters heating mode. This setting allows for a quick change of the indoor temperature to the preset temperature, thus improving the user experience.

[0120] In some embodiments, the controller includes a processor, and optionally, also includes a memory and a communication interface connected to the processor. The processor, memory, and communication interface are connected via a bus.

[0121] A processor can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. A processor can also be any other device with processing capabilities, such as a circuit, device, or software module. A processor can also include multiple CPUs, and a processor can be a single-core processor or a multi-core processor. Here, "processor" can refer to one or more devices, circuits, or processing cores used to process data (e.g., computer program instructions).

[0122] The memory can be read-only memory (ROM) or other types of static storage devices capable of storing static information and instructions, random access memory (RAM) or other types of dynamic storage devices capable of storing information and instructions. It can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, universal optical discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. This application embodiment does not impose any limitations on this. The memory can exist independently or be integrated with the processor. The memory may contain computer program code. The processor executes the computer program code stored in the memory to implement the air conditioning system control method provided in this application embodiment.

[0123] A communication interface can be used to communicate with other devices or communication networks (such as Ethernet, radioaccess network (RAN), wireless local area network (WLAN), etc.). The communication interface can be a module, circuit, transceiver, or any device capable of enabling communication.

[0124] A bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc.

[0125] This invention also provides a computer-readable storage medium, which includes computer-executable instructions. When the computer-executable instructions are executed on the computer, the computer performs a control method for an air conditioning system as provided in the above embodiments.

[0126] This invention also provides a computer program product that can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can realize the control method of an air conditioning system provided in the above embodiments.

[0127] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0128] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioning system, characterized in that, include: The reheat dehumidification circulation path includes a compressor, an outdoor heat exchanger, a first throttling device, a first indoor heat exchanger, a second throttling device, and a second indoor heat exchanger connected in sequence; wherein, in the indoor air outlet direction, the second indoor heat exchanger is located upstream of the first indoor heat exchanger; the heat exchange area of ​​the second indoor heat exchanger is larger than that of the first indoor heat exchanger. An outdoor fan is located on one side of the outdoor heat exchanger; An indoor temperature sensor is used to detect the indoor ambient temperature Tr of the air conditioning system; An outdoor temperature sensor is used to detect the outdoor ambient temperature To of the air conditioning system; The outlet air temperature sensor is used to detect the actual outlet air temperature T of the air conditioning system. 实际 ; The controller is configured to: When the air conditioning system enters the reheat dehumidification mode, the first throttling device is fully opened, and the second throttling device is activated to throttle. When the air conditioning system is operating in reheat dehumidification mode, If the indoor ambient temperature Tr is greater than the outdoor ambient temperature To, then the user-preset indoor temperature T is determined. 预设 +ΔT1 is the target outlet air temperature T 目标 ; If the indoor ambient temperature Tr = the outdoor ambient temperature To, then the user-preset indoor temperature T is determined. 预设 The target outlet air temperature T 目标 ; If the indoor ambient temperature Tr < the outdoor ambient temperature To, then the user-preset indoor temperature T is determined. 预设 -ΔT1 is the target outlet air temperature T 目标 ; Where ΔT1>0; If the actual outlet air temperature T 实际 <The target outlet air temperature T 目标 When this happens, the speed of the outdoor fan is reduced to a first preset speed. If the actual outlet air temperature T 实际 =The target outlet air temperature T 目标 When this happens, the speed of the outdoor fan is kept constant. If the actual outlet air temperature T 实际 >The target outlet air temperature T 目标 When the outdoor fan speed is increased to the second preset speed, the speed of the outdoor fan is controlled to increase.

2. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes: An electric auxiliary heating device is located downstream of the first indoor heat exchanger in the indoor air outlet direction; The controller is configured to: When the actual outlet air temperature T 实际 <The target outlet air temperature T 目标 When the outdoor fan speed is reduced to 0, the electric auxiliary heating device is controlled to start operation.

3. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes: An indoor humidity sensor, used to detect the actual indoor humidity (RH); The controller is configured to: When the air conditioning system is operating in reheat dehumidification mode, the operating frequency of the compressor is adjusted according to the actual indoor humidity RH and the preset humidity RHs.

4. The air conditioning system according to claim 3, characterized in that, The controller is configured to: When the air conditioning system enters the reheat dehumidification mode, the compressor is controlled to run at a preset initial frequency F0; When the air conditioning system is operating in reheat dehumidification mode, an adjustment coefficient K is determined based on the difference range between the actual indoor humidity RH and the preset humidity RHs, ΔRH. Based on the determined adjustment coefficient K, the operating frequency of the compressor is adjusted to F. 调 ; wherein, the F 调 It is the product of the preset initial frequency F0 and the adjustment coefficient K.

5. The air conditioning system according to claim 4, characterized in that, The controller is configured to: If △RH>15%, the adjustment coefficient K is determined to be the first preset value K1; If 10%≤△RH≤15%, the adjustment coefficient K is determined to be the second preset value K2; If 0% < ΔRH < 10%, the adjustment coefficient K is determined to be the third preset value K3; If △RH≤0%, control the compressor to stop; Among them, K1> K2> K3.

6. The air conditioning system according to claim 1, characterized in that, The air conditioning system also includes: A coil temperature sensor is used to detect the coil temperature T of the second indoor heat exchanger. coil ; An indoor humidity sensor, used to detect the actual indoor humidity (RH); The controller is configured as follows: When the air conditioning system is operating in reheat dehumidification mode, a target difference value corresponding to the humidity range is determined based on the humidity range where the actual indoor humidity RH is located. Based on the indoor dew point temperature Td and the coil temperature T of the second indoor heat exchanger coil The relationship between the difference and the target difference is used to adjust the opening of the second throttling device.

7. The air conditioning system according to claim 6, characterized in that, The controller is configured to: When RH ≥ 80%, the target difference is determined to be the first set value T. 11 ; When 60% < RH < 80%, the target difference is determined to be the second set value T. 12 ; When RH≤60%, the target difference is determined to be the third set value T. 13 ; Among them, T 11 > T 12 > T 13 .

8. The air conditioning system according to claim 6, characterized in that, The controller is configured as follows: If the indoor dew point temperature is Td and the coil temperature of the second indoor heat exchanger is T coil When the difference is less than the target difference, the opening of the second throttling device is reduced. If the indoor dew point temperature is Td and the coil temperature of the second indoor heat exchanger is T coil When the difference equals the target difference, the opening degree of the second throttling device is kept unchanged. If the indoor dew point temperature is Td and the coil temperature of the second indoor heat exchanger is T coil When the difference is greater than the target difference, the opening of the second throttling device is increased.

9. The air conditioning system according to any one of claims 1-8, characterized in that, The controller is configured as follows: Before controlling the air conditioning system to enter the reheat dehumidification mode. Obtain control commands for reheat dehumidification mode; When the reheat dehumidification mode control command is received and the air conditioning system meets the first preset condition and / or the second preset condition, the air conditioning system is controlled to enter the reheat dehumidification mode. The first preset condition is: the user presets the indoor temperature T. 预设 The relationship between the indoor ambient temperature Tr and the indoor ambient temperature Tr satisfies: Indoor ambient temperature Tr - ΔT2 ≤ User preset indoor temperature T 预设 ≤Indoor ambient temperature Tr + ΔT2; The second preset condition is: the actual indoor humidity RH is greater than or equal to the preset humidity RHs.

10. The air conditioning system according to claim 1, characterized in that, The first throttling device includes an electronic expansion valve and a solenoid valve connected in parallel, and the controller is configured to: When the air conditioning system is operating in reheat dehumidification mode, the solenoid valve is controlled to open.

11. A reheat dehumidification control method for an air conditioning system, characterized in that, Applied to the air conditioning system of any one of claims 1-10, the method comprises: Control the air conditioning system to enter reheat dehumidification mode; When the air conditioning system is operating in reheat dehumidification mode, If the indoor ambient temperature Tr is greater than the outdoor ambient temperature To, then the user-preset indoor temperature T is determined. 预设 +ΔT1 is the target outlet air temperature T 目标 ; If the indoor ambient temperature Tr = the outdoor ambient temperature To, then the user-preset indoor temperature T is determined. 预设 The target outlet air temperature T 目标 ; If the indoor ambient temperature Tr < the outdoor ambient temperature To, then the user-preset indoor temperature T is determined. 预设 -ΔT1 is the target outlet air temperature T 目标 ; Where ΔT1>0; If the actual outlet air temperature T 实际 <The target outlet air temperature T 目标 When this happens, the speed of the outdoor fan is reduced to a first preset speed. If the actual outlet air temperature T 实际 =The target outlet air temperature T 目标 When this happens, the speed of the outdoor fan is kept constant. If the actual outlet air temperature T 实际 >The target outlet air temperature T 目标 When the outdoor fan speed is increased to the second preset speed, the speed of the outdoor fan is controlled to increase.

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