Method, device and equipment for controlling fresh air equipment and storage medium

Abstract

The application discloses a fresh air equipment control method and device, equipment and storage medium, and relates to the technical field of air treatment equipment; the fresh air equipment comprises a first heat exchange system, a second heat exchange system and a humidification equipment; the method comprises the following steps: when the fresh air equipment is in a refrigeration and humidification mode, it is judged whether the first refrigeration capacity output by the fresh air equipment is greater than a preset refrigeration capacity; when the first refrigeration capacity is greater than the preset refrigeration capacity, the first heat exchange system and / or the second heat exchange system is controlled to switch from a refrigeration mode to a heating mode, so as to reduce the first refrigeration capacity. According to the application, when the fresh air equipment enters the refrigeration and humidification mode, the refrigeration capacity output by the fresh air equipment is judged; when the refrigeration capacity is too high, the first heat exchange system and / or the second heat exchange system is controlled to enter the heating mode, so that the humidification equipment is prevented from being started to reduce the outlet air temperature, and the user experience is improved.

Description

[0001] This invention patent application is a divisional application of Chinese invention patent application filed on November 24, 2021, with application number 202111410551.1 and titled "Control method, device, equipment and storage medium for fresh air equipment". Technical Field

[0002] This invention relates to the field of air handling equipment technology, and in particular to a control method, device, equipment and storage medium for a fresh air system. Background Technology

[0003] Currently, most fresh air systems integrate heating and humidification functions, lacking humidification control in cooling mode. Humidification devices are mostly isenthalpic (such as wet film, ultrasonic, and water spray), which cool the fresh air upon startup. Therefore, activating humidification after the fresh air system has switched to cooling mode can easily lead to a drop in outlet air temperature, resulting in excessively cold indoor air and a poor user experience. Summary of the Invention

[0004] The main objective of this invention is to provide a control method, device, equipment, and storage medium for a fresh air system, aiming to solve the technical problem that the outlet air temperature easily decreases after the fresh air system is turned on for cooling and humidification.

[0005] To achieve the above objectives, the present invention provides a control method for a fresh air device. The fresh air device includes a first heat exchange system, a second heat exchange system, and a humidification device. The first heat exchange system is used for heat exchange between the fresh air duct and the external environment, the second heat exchange system is used for heat exchange between the fresh air duct and the exhaust duct, and the humidification device is installed inside the fresh air duct.

[0006] Humidification control methods for fresh air equipment include:

[0007] When the fresh air system is in cooling and humidification mode, determine whether the initial cooling capacity output by the fresh air system is greater than the preset cooling capacity; and,

[0008] When the first cooling capacity is greater than the preset cooling capacity, the first heat exchange system and / or the second heat exchange system are controlled to switch from cooling mode to heating mode to reduce the first cooling capacity.

[0009] Optionally, controlling the first heat exchange system and / or the second heat exchange system to switch from cooling mode to heating mode includes:

[0010] Control the second heat exchange system to switch from cooling mode to heating mode;

[0011] Determine whether the second cooling capacity output by the fresh air system is greater than the preset cooling capacity; and...

[0012] When the second cooling capacity is greater than the preset cooling capacity, the compressor speed corresponding to the second heat exchange system is increased and / or the opening degree of the throttling element corresponding to the second heat exchange system is decreased.

[0013] Optionally, the control methods also include:

[0014] When controlling the second heat exchange system to switch from cooling mode to heating mode, the first evaporation temperature is obtained. The first evaporation temperature is the evaporation temperature of the evaporator in the first heat exchange system.

[0015] When the first evaporation temperature is lower than the fresh air dew point temperature, the compressor speed corresponding to the first heat exchange system is reduced and / or the opening of the throttling element corresponding to the first heat exchange system is increased to raise the first evaporation temperature.

[0016] Optionally, after increasing the compressor speed corresponding to the second heat exchange system and / or decreasing the opening of the throttling element corresponding to the second heat exchange system, the control method further includes:

[0017] Determine whether the third cooling capacity output by the fresh air system is greater than the preset cooling capacity;

[0018] When the third cooling capacity is greater than the preset cooling capacity, the first heat exchange system is controlled to switch from cooling mode to heating mode.

[0019] Optionally, after controlling the first heat exchange system and / or the second heat exchange system to switch from cooling mode to heating mode, the method further includes:

[0020] When the humidifier switches from the on state to the off state, determine the current operating mode of each heat exchange system in the fresh air equipment;

[0021] The fourth cooling capacity output by the fresh air system is compared with the set cooling capacity to obtain the cooling capacity comparison result; and,

[0022] Adjust the operating parameters of the fresh air system based on the current operating mode and the comparison results of cooling capacity.

[0023] Optionally, both the first and second heat exchange systems include a compressor and a throttling element; the operating parameters of the fresh air system are adjusted based on the current operating mode and the cooling capacity comparison results, including:

[0024] When the fourth cooling capacity is less than the preset cooling capacity, increase the compressor speed and / or the opening of the throttling element corresponding to the heat exchange system operating in cooling mode, and / or decrease the compressor speed and / or the opening of the throttling element corresponding to the heat exchange system operating in heating mode.

[0025] When the fourth cooling capacity is greater than the preset cooling capacity, the compressor speed and / or the opening degree of the throttling element corresponding to the heat exchange system operating in cooling mode are reduced, and / or the compressor speed and / or the opening degree of the throttling element corresponding to the heat exchange system operating in heating mode are increased.

[0026] Optionally, the control methods also include:

[0027] When the initial cooling capacity is less than the preset cooling capacity, the heat exchange system in the fresh air equipment is controlled to operate in cooling mode without dehumidification.

[0028] Controlling the heat exchange system in the fresh air system to operate in cooling mode without dehumidification includes:

[0029] Obtain the evaporation temperature of the evaporator in each heat exchange system;

[0030] When the evaporation temperature is lower than the fresh air dew point temperature, reduce the compressor speed of the corresponding heat exchange system and / or increase the opening of the throttling element of the corresponding heat exchange system.

[0031] Optionally, determining whether the initial cooling capacity output by the fresh air system is greater than the preset cooling capacity includes:

[0032] Obtain the detection temperature corresponding to the set location;

[0033] The detected temperature is compared with the preset cooling temperature to obtain the first comparison result; and,

[0034] Based on the first comparison result, determine whether the first cooling capacity output by the fresh air equipment is greater than the preset cooling capacity.

[0035] Optionally, before determining whether the initial cooling capacity output by the fresh air system is greater than the preset cooling capacity, the following steps are also included:

[0036] Obtain the moisture content at the specified location; and,

[0037] When the detected moisture content is lower than the preset moisture content, the humidifier is turned on.

[0038] In addition, to achieve the above objectives, the present invention also proposes a control device for a fresh air equipment. The fresh air equipment includes a first heat exchange system and a second heat exchange system. The first heat exchange system is used for heat exchange between the fresh air duct and the external environment, and the second heat exchange system is used for heat exchange between the fresh air duct and the exhaust duct. A humidification device is installed in the fresh air duct.

[0039] The control device includes:

[0040] The judgment module is used to determine whether the initial cooling capacity output by the fresh air unit is greater than the preset cooling capacity when the fresh air unit is in cooling and humidification mode; and,

[0041] The drive module is used to control the first heat exchange system and / or the second heat exchange system to switch from cooling mode to heating mode to reduce the cooling capacity when the first cooling capacity is greater than the preset cooling capacity.

[0042] Furthermore, to achieve the above objectives, the present invention also proposes a fresh air device, which includes: a first heat exchange system, a second heat exchange system, a humidifier, a memory, a processor, and a control program for the fresh air device stored in the memory and executable on the processor. The first heat exchange system is used for heat exchange between the fresh air duct and the external environment, the second heat exchange system is used for heat exchange between the fresh air duct and the exhaust duct, and the control program for the fresh air device, when executed by the processor, implements the control method for the fresh air device as described above.

[0043] Optionally, the fresh air equipment has a fresh air duct and an exhaust air duct. The first heat exchange system includes a first compressor, a first four-way valve, a first heat exchanger, a first throttling element, and a second heat exchanger; the second heat exchange system includes a second compressor, a second four-way valve, a third heat exchanger, a second throttling element, and a fourth heat exchanger. When the first heat exchange system is in cooling mode, the refrigerant output from the first compressor passes sequentially through the first four-way valve, the first heat exchanger, the first throttling element, and the second heat exchanger. When the second heat exchange system is in cooling mode, the refrigerant output from the second compressor passes sequentially through the second compressor, the second four-way valve, the third heat exchanger, the second throttling element, and the fourth heat exchanger.

[0044] The first heat exchanger is located in the external environment;

[0045] The fresh air duct is equipped with a second heat exchanger, a fourth heat exchanger, a humidifier, and a fresh air fan, arranged sequentially from the outside to the inside; and...

[0046] A third heat exchanger and an exhaust fan are installed in the exhaust duct.

[0047] Optionally, the first heat exchange system further includes a third throttling element and a fifth heat exchanger. One end of the fifth heat exchanger is connected to the first compressor, and the other end of the fifth heat exchanger is connected to one end of the second heat exchanger through the third throttling element. The fifth heat exchange system is disposed within the fresh air duct. The second heat exchange system further includes a fourth throttling element and a sixth heat exchanger. One end of the sixth heat exchanger is connected to the second compressor, and the other end of the sixth heat exchanger is connected to one end of the fourth heat exchanger through the fourth throttling element. The sixth heat exchange system is disposed within the fresh air duct.

[0048] In addition, to achieve the above objectives, the present invention also proposes a storage medium storing a control program for a fresh air device, wherein the control program for the fresh air device is executed by a processor to implement the control method for the fresh air device as described above.

[0049] In this invention, the fresh air device includes a first heat exchange system, a second heat exchange system, and a humidifier. The first heat exchange system is used for heat exchange between the fresh air duct and the external environment, the second heat exchange system is used for heat exchange between the fresh air duct and the exhaust air duct, and the humidifier is installed in the fresh air duct. When the fresh air device is in cooling and humidification mode, it is determined whether the first cooling capacity output by the fresh air device exceeds a preset cooling capacity. If the first cooling capacity exceeds the preset cooling capacity, the first heat exchange system and / or the second heat exchange system are controlled to switch from cooling mode to heating mode to reduce the first cooling capacity. This invention, by judging the cooling capacity output by the fresh air device when it enters cooling and humidification mode, and controlling the first heat exchange system and / or the second heat exchange system to enter heating mode when the cooling capacity is too high, avoids a decrease in outlet air temperature after the humidifier is turned on, thus improving the user experience. Attached Figure Description

[0050] Figure 1 This is a functional block diagram of the fresh air equipment in the hardware operating environment involved in the embodiments of the present invention;

[0051] Figure 2 This is a schematic diagram of the structure of one embodiment of the fresh air device of the present invention;

[0052] Figure 3 This is a flowchart illustrating the first embodiment of the control method for the fresh air device of the present invention;

[0053] Figure 4 This is a flowchart illustrating the second embodiment of the control method for the fresh air device of the present invention;

[0054] Figure 5 This is a flowchart illustrating the third embodiment of the control method for the fresh air device of the present invention;

[0055] Figure 6 This is a structural block diagram of the first embodiment of the control device for the fresh air equipment of the present invention.

[0056] Explanation of icon numbers:

[0057] label name label name 1001 processor 20 Exhaust duct 1002 Communication bus C1~C2 First and second compressors 1003 User Interface V1~V2 First to second four-way valves 1004 Network interface H1~H4 First to fourth heat exchangers 1005 memory K1~K2 First to second throttling elements 1006 First heat exchange system Y1~Y3 First to third wind turbines 1007 Second heat exchange system 100 Judgment Module 10 Fresh air duct 200 driver module

[0058] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0059] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0060] Reference Figure 1 , Figure 1 This is a structural block diagram of the fresh air equipment in the hardware operating environment of the embodiment of the present invention.

[0061] like Figure 1 As shown, the fresh air device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, a memory 1005, a first heat exchange system 1006, and a second heat exchange system 1007.

[0062] In this embodiment, the communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or a standard wired or wireless interface. The network interface 1004 may optionally include a standard wired or wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (RAM) or a non-volatile memory (NVM), such as a disk drive. Alternatively, the memory 1005 may be a storage device independent of the aforementioned processor 1001.

[0063] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the fresh air system and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0064] like Figure 1 As shown, the memory 1005, which is identified as a computer storage medium, may include an operating system, a network communication module, a user interface module, and a control program for a fresh air system.

[0065] exist Figure 1 In the fresh air device shown, the network interface 1004 is mainly used to connect to the backend server and communicate with the backend server; the user interface 1003 is mainly used to connect to the user device; the fresh air device calls the control program of the fresh air device stored in the memory 1005 through the processor 1001 and executes the control method of the fresh air device provided in the embodiment of the present invention.

[0066] Reference Figure 2 , Figure 2This is a schematic diagram of one embodiment of the fresh air device of the present invention. To more clearly illustrate the control method of the fresh air device of the present invention, a fresh air device is proposed, and the control method of the fresh air device is implemented based on the fresh air device.

[0067] like Figure 2 As shown, the fresh air system may have a first heat exchange system 1006 and a second heat exchange system 1007. The first heat exchange system 1006 may include a first compressor C1, a first four-way valve V1, a first heat exchanger H1, a first throttling element K1, and a second heat exchanger H2. The second heat exchange system 1007 may include a second compressor C2, a second four-way valve V2, a third heat exchanger H3, a second throttling element K2, and a fourth heat exchanger H4. The first throttling element K1 and the second throttling element K2 may be electronic expansion valves or capillary tubes. The first compressor C1 and the second compressor C2 are two independent compressors.

[0068] The fresh air equipment can have a cooling mode and a heating mode. The cooling mode refers to the fresh air being cooled and / or dehumidified by the second heat exchanger H2 and the fourth heat exchanger H4 before being delivered to the room. The heating mode refers to the fresh air being heated by the second heat exchanger H2 and the fourth heat exchanger H4 before being delivered to the room.

[0069] When the first heat exchange system 1006 is in cooling mode, high-temperature, high-pressure refrigerant is output from the first compressor C1, flows through the first four-way valve V1 to the first heat exchanger H1, where it exchanges heat with the ambient air and cools down. Then, it is converted to low-temperature, low-pressure refrigerant by the first throttling element K1, and then exchanges heat with the air in the fresh air duct in the second heat exchanger H2, where it heats up, and finally returns to the first compressor C1. In heating mode, the refrigerant's flow direction is reversed: the high-temperature, high-pressure refrigerant first exchanges heat and cools down in the second heat exchanger H2, then exchanges heat and heats up in the first heat exchanger H1, and finally returns to the first compressor C1.

[0070] The operation mode of the second heat exchange system 1007 is similar to that of the first heat exchange system 1006. During cooling, the high-temperature and high-pressure refrigerant first exchanges heat and cools down in the third heat exchanger H3, then exchanges heat and heats up in the fourth heat exchanger H4, and finally returns to the second compressor C2. During heating, the high-temperature and high-pressure refrigerant first exchanges heat and cools down in the fourth heat exchanger H4, then exchanges heat and heats up in the third heat exchanger H3, and finally returns to the second compressor C2.

[0071] Furthermore, the first and second heat exchange systems can share a multi-cylinder compressor. Specifically, the fresh air unit includes a compressor with two independent cylinders. The first cylinder of this compressor is connected to a first four-way valve V1, a first heat exchanger H1, a first throttling element K1, and a second heat exchanger H2, forming the first heat exchange system 1006. The second cylinder of this compressor is connected to a second four-way valve V2, a third heat exchanger H3, a second throttling element K2, and a fourth heat exchanger H4, forming the second heat exchange system 1007. The refrigerants in the first and second heat exchange systems are isolated from each other.

[0072] It should be noted that the fresh air equipment also includes a fresh air duct 10 and an exhaust duct 20. A second fan Y2 and a humidifier X are installed within the fresh air duct 10. The second fan Y2 draws air from the external environment into the fresh air duct 10, and the humidifier X humidifies the air within the fresh air duct. Specifically, the humidifier X can be a wet-film humidification module or a waterless humidification module; in this embodiment, a wet-film humidification module is preferred. A third fan Y3 is installed within the exhaust duct 20, which draws air from the indoor environment into the exhaust duct 20.

[0073] Specifically, in the fresh air duct 10, from the outside to the inside, a second heat exchanger H2, a fourth heat exchanger H4, a humidifier X, and a second fan Y2 are arranged in sequence. In the exhaust air duct 20, from the outside to the inside, a third heat exchanger H3 and a third fan Y3 are arranged in sequence.

[0074] In addition, the first heat exchange system 1006 also includes a first fan Y1, which is correspondingly arranged with the first heat exchanger H1. The first fan Y1 is used to circulate the air in the external environment on the surface of the first heat exchanger H1, so that the refrigerant in the first heat exchanger H1 exchanges heat with the air in the external environment.

[0075] The working principle of the above-mentioned fresh air equipment is as follows: the second fan Y2 draws fresh air from the external environment, and the fresh air undergoes two heat exchanges in sequence through the second heat exchanger H2 and the fourth heat exchanger H4. Then, it is humidified by the humidifier X and delivered to the indoor environment. The third fan Y3 draws exhaust air from the indoor environment, and the exhaust air undergoes one heat exchange through the third heat exchanger H3 before being delivered to the outside.

[0076] It should be noted that fresh air equipment may also include more or fewer components than shown in the diagram, or combine certain components, or have different component arrangements.

[0077] In another embodiment, both the first heat exchange system 1006 and the second heat exchange system 1007 can be equipped with multiple heat exchangers in the fresh air duct 10; the heat exchangers in each heat exchanger system are arranged in a cross-shaped manner.

[0078] Specifically, the first heat exchange system 1006 may further include a third throttling element and a fifth heat exchanger. One end of the fifth heat exchanger may be connected to the first compressor C1, and the other end of the fifth heat exchanger may be connected to one end of the second heat exchanger H2 through the third throttling element.

[0079] The second heat exchange system 1007 may also include a fourth throttling element and a sixth heat exchanger. One end of the sixth heat exchanger may be connected to the second compressor C2, and the other end of the sixth heat exchanger may be connected to one end of the fourth heat exchanger H4 through the fourth throttling element.

[0080] The fresh air duct 10 is equipped with a second heat exchanger H2, a fourth heat exchanger H4, a fifth heat exchanger, a sixth heat exchanger, and a second fan Y2 arranged sequentially from the outside to the inside. Thus, the fresh air in the fresh air duct can exchange heat through four heat exchangers. Of course, the number of heat exchangers in each heat exchange system can be set according to requirements; this embodiment does not impose any restrictions on this.

[0081] Based on the above hardware structure, an embodiment of the control method for the fresh air device of the present invention is proposed.

[0082] Reference Figure 3 , Figure 3 This is a flowchart illustrating the first embodiment of the control method for the fresh air device of the present invention, which presents the first embodiment of the control method for the fresh air device of the present invention.

[0083] In the first embodiment, the control method for the fresh air device includes the following steps:

[0084] Step S10: When the fresh air equipment is in cooling and humidifying mode, determine whether the first cooling capacity output by the fresh air equipment is greater than the preset cooling capacity.

[0085] It should be understood that the execution subject in this embodiment is the aforementioned fresh air device, which has functions such as data processing, data communication, and program execution. Typically, the operation of each component in the fresh air device can be driven by a core controller. Therefore, the execution subject in this embodiment can also be the core controller within the aforementioned fresh air device. This core controller can be the aforementioned processor. This embodiment describes the core controller as the execution subject.

[0086] It should be noted that when the fresh air system is in cooling and humidification mode, both the first and second heat exchange systems operate in cooling mode according to preset operating parameters. Each heat exchanger within the fresh air duct is in an evaporation state to cool the fresh air within the duct. The humidification equipment is on, humidifying the fresh air and simultaneously cooling it. Therefore, the first cooling capacity refers to the sum of the cooling capacities of the first and second heat exchange systems and the humidification equipment; the preset cooling capacity can be determined based on the user-set preset cooling temperature and the current ambient temperature.

[0087] It is understandable that if the humidifier is off and the fresh air system is operating stably, the cooling capacity output by the first and second heat exchange systems will exactly meet the preset cooling capacity. Therefore, when the humidifier is switched on, because it has a cooling effect, the cooling capacity of the first heat exchange system will exceed the preset cooling capacity, even if the operating parameters of the first and second heat exchange systems remain unchanged, making the user feel too cold.

[0088] In this embodiment, to reasonably control the humidification equipment, the fresh air system can determine in real time whether the humidification equipment needs to be turned on. When the humidification equipment needs to be turned on, it is controlled to be in the on state; when the humidification equipment does not need to be turned on, it is controlled to be in the off state. In specific implementation, the humidity content at a set location can be obtained first; and when the detected humidity content is less than the preset humidity content, the humidification equipment is controlled to be turned on.

[0089] It should be noted that the set location can include the indoor environment, the air outlet of the fresh air system, or the air inlet of the fresh air system. When the fresh air system is not humidifying, the humidity at these locations is usually the same. The humidity at these locations reflects the humidity of the user's environment; if the humidity is low, the humidifier can be turned on. The preset humidity can be set by the user or determined by the core controller based on the current season or time. For example, the preset humidity range for the indoor environment can be 5–14 g / kg, the preset humidity range for the air outlet of the fresh air system can be 5–16 g / kg, and the preset humidity range for the air inlet of the fresh air system can be 5–18 g / kg. Furthermore, the specific operating parameters of the humidifier can be determined based on the difference between the indoor humidity and the preset humidity. Mature technologies already exist for controlling humidifiers, and this embodiment will not elaborate further. Of course, other methods can also be used to control the humidifier's on / off state, and this embodiment does not limit this.

[0090] In this embodiment, to facilitate determining the relationship between the first cooling capacity and the preset cooling capacity, the temperature at various locations within the fresh air system can be detected and judged. Specifically, the detected temperature at a set location can be obtained; the detected temperature can be compared with the preset cooling temperature to obtain a first comparison result; and based on the first comparison result, it can be determined whether the first cooling capacity output by the fresh air system is greater than the preset cooling capacity.

[0091] It should be noted that the set location can also include the indoor environment, the air outlet of the fresh air system, or the air inlet of the fresh air system. The temperature at each location reflects the cooling capacity provided by the fresh air system. The preset cooling temperature can be preset by the user or determined by the core controller based on the current season or time. For example, the preset cooling temperature range for the indoor environment can be 15–32°C; the preset cooling temperature range for the air outlet of the fresh air system can be 5–32°C; and the preset cooling temperature range for the air inlet of the fresh air system can be 10–50°C. When the indoor temperature is lower than the corresponding preset cooling temperature, the air outlet temperature is lower than the corresponding preset cooling temperature, or the fresh air temperature at the air inlet is lower than the corresponding preset cooling temperature, it indicates that the user's current perceived temperature is low, and the first cooling capacity is determined to be greater than the preset cooling capacity; conversely, the first cooling capacity is determined to be less than or equal to the preset cooling capacity. Of course, other methods can be used to determine the cooling capacity, and this implementation does not limit this.

[0092] It should be noted that the aforementioned moisture content and temperature can be obtained through temperature and humidity sensors. Specifically, temperature and humidity sensors can be pre-installed at the inlet and outlet of the fresh air duct, as well as within the service environment. These sensors are connected to the core controller. The sensors can transmit temperature, humidity, or moisture content signals to the core controller in real time or intermittently. The core controller analyzes the received temperature and humidity signals to obtain the temperature, humidity, or moisture content. Furthermore, since the fresh air temperature and moisture content are the same as those of the external environment, the core controller can also connect to a meteorological database to obtain the fresh air temperature and moisture content by acquiring local meteorological data. Of course, the aforementioned moisture content and temperature can also be obtained using other methods, and this embodiment does not limit this approach.

[0093] Step S20: When the first cooling capacity is greater than the preset cooling capacity, control the first heat exchange system and / or the second heat exchange system to switch from cooling mode to heating mode to reduce the first cooling capacity.

[0094] Understandably, if the humidifier causes the outlet air temperature to drop, resulting in the initial cooling capacity exceeding the preset cooling capacity, the outlet air temperature needs to be increased to avoid user discomfort. In this case, either or both of the first and second heat exchange systems can be switched to heating mode to heat the fresh air.

[0095] Specifically, the switching between heating and cooling modes in the heat exchange system is controlled by a four-way valve. When the heat exchange system switches from cooling mode to heating mode, the direction of the four-way valve is adjusted to change the direction of the heat exchange system piping, thus switching the refrigerant flow direction. The refrigerant flow direction can be referred to the above, and will not be repeated here in this embodiment.

[0096] It should be noted that if the first cooling capacity is less than or equal to the preset cooling capacity, both the first and second heat exchange systems will continue to operate in cooling mode. The operating parameters of the first and second heat exchange systems can be determined based on the difference between the first cooling capacity and the preset cooling capacity. Furthermore, when the first and second heat exchange systems are cooling, dehumidification of the fresh air should be avoided.

[0097] In practical implementation, if the initial cooling capacity is less than the preset cooling capacity, the heat exchange system in the fresh air system will be controlled to operate in cooling mode without dehumidification. That is, both the first and second heat exchange systems will operate in cooling mode, and dehumidification must be avoided. The control method for cooling without dehumidification is as follows: obtain the evaporation temperature of the evaporator in each heat exchange system; when the evaporation temperature is lower than the fresh air dew point temperature, reduce the compressor speed of the corresponding heat exchange system and / or increase the opening of the throttling element of the corresponding heat exchange system.

[0098] Reference Figure 2 Each evaporator can be a second or fourth heat exchanger. When the evaporation temperature is lower than the fresh air dew point temperature, the compressor speed in the heat exchange system is reduced, or the opening of the throttling element is increased. Thus, just before the heat exchange system is about to dehumidify the fresh air, the heat exchange capacity of the system is reduced, and the refrigerant temperature inside the evaporator is increased, avoiding dehumidification of the fresh air. This avoids energy waste caused by increasing the operating power of the humidification equipment due to dehumidification of the fresh air during the cooling process.

[0099] As an example, the operation of a fresh air system can be described as follows: Assume the fresh air temperature is 28℃, the dew point temperature is 10℃, the exhaust air temperature is 25℃, and the required indoor temperature is 20℃. If the user requires humidification, the first and second heat exchange systems will cool the fresh air without dehumidifying it. By controlling the compressor speed or the opening of the expansion valve, the evaporation temperature of each heat exchanger in the fresh air duct will be 15℃. After passing through the humidification equipment, the outlet air temperature will be 20℃, thus meeting the requirements for indoor cooling and humidification.

[0100] As another example, the operation of a fresh air system can also be as follows: Assume the fresh air temperature is 20℃, the dew point temperature is 8℃, the exhaust air temperature is 25℃, and the required indoor temperature is 20℃. If the user needs humidification, the second heat exchange system starts heating, the first heat exchange system stops, and the opening of the compressor or expansion valve in the second heat exchange system is adjusted to heat the fresh air. After being humidified by the humidification equipment, the outlet air temperature is 20℃, meeting the requirements for indoor cooling and humidification.

[0101] In the first embodiment, the fresh air device has a two-stage heat exchange system. The first heat exchange system is used to achieve heat exchange between the fresh air duct and the external environment; the second heat exchange system is used to achieve heat exchange between the fresh air duct and the exhaust duct. When the fresh air device enters the cooling and humidification mode, it is determined whether the first cooling capacity output by the fresh air device is greater than the preset cooling capacity. If so, the first heat exchange system and / or the second heat exchange system are controlled to switch from the cooling mode to the heating mode to reduce the first cooling capacity. This avoids the outlet air temperature from decreasing after the humidification device is turned on, thus improving the user experience.

[0102] Reference Figure 4 , Figure 4 This is a flowchart illustrating a second embodiment of the control method for the fresh air device of the present invention. Based on the first embodiment described above, a second embodiment of the control method for the fresh air device of the present invention is proposed.

[0103] In the second embodiment, to more accurately control the operating mode of the fresh air equipment, step S20 may include:

[0104] Step S201: Control the second heat exchange system to switch from cooling mode to heating mode.

[0105] It should be noted that the second heat exchange system has high energy efficiency because it can recover heat. Therefore, when it is necessary to heat the fresh air, the second heat exchange system should be put into heating mode first to improve the energy efficiency of the fresh air equipment.

[0106] In practical implementation, the specific operating parameters of the second heat exchange system can be determined based on the difference between the first cooling capacity and the preset cooling capacity. Furthermore, to ensure the energy efficiency of the fresh air system, an energy consumption threshold can be set for the second heat exchange system. For example, a threshold can be set for the pressure ratio of the second heat exchange system to ensure that the pressure ratio is within a preset range, thereby improving the energy efficiency of the second heat exchange system.

[0107] Step S202: Determine whether the second cooling capacity output by the fresh air equipment is greater than the preset cooling capacity.

[0108] It should be noted that the second cooling capacity is the sum of the cooling capacity provided by the first heat exchange system and the humidification equipment, and the heating capacity provided by the second heat exchange system. To ensure the energy efficiency of the fresh air system, the second heat exchange system operates within a limited range, which results in a limited heating capacity it provides. In this case, it may not be able to completely eliminate the temperature drop; to ensure a good user experience, it is necessary to further determine the cooling capacity output of the fresh air system.

[0109] In this embodiment, the method for determining the cooling capacity can refer to the first embodiment. For example, if the fresh air temperature is 20°C and the required indoor temperature is 20°C, when the user has a humidification need, the humidification equipment operates according to the humidification need, and the first and second heat exchange systems enter cooling mode. If the outlet air temperature of the fresh air unit is 15°C after the humidification equipment is turned on, it indicates that the first cooling capacity is greater than the preset cooling capacity; at this time, the second heat exchange system is controlled to enter heating mode. After the second heat exchange system has entered heating mode for a preset time period, if the outlet air temperature is 18°C, it indicates that the second cooling capacity is greater than the preset cooling capacity. Of course, indoor temperature or fresh air temperature can also be used for judgment, as detailed in the first embodiment. The preset time period can be set according to needs, such as 1 minute or 2 minutes. The second heat exchange system can gradually increase its heating capacity during the preset time period until it reaches the energy efficiency limit.

[0110] Step S203: When the second cooling capacity is greater than the preset cooling capacity, increase the compressor speed corresponding to the second heat exchange system and / or decrease the opening degree of the throttling element corresponding to the second heat exchange system.

[0111] Understandably, if the second cooling capacity provided by the fresh air system is too high, in order to ensure the user experience, the heating capacity of the second heat exchange system can be improved by increasing the compressor speed corresponding to the second heat exchange system and / or reducing the opening of the throttling element corresponding to the second heat exchange system.

[0112] It should be noted that if the second heat exchange system cannot compensate for the temperature drop caused by the humidification equipment, the first heat exchange system can also be put into heating mode. That is, after increasing the heating capacity of the second heat exchange system, it is determined whether the third cooling capacity output by the fresh air equipment is greater than the preset cooling capacity; if the third cooling capacity is greater than the preset cooling capacity, the first heat exchange system is controlled to switch from cooling mode to heating mode.

[0113] The third cooling capacity refers to the cooling capacity of the fresh air system over a period of time after the heating capacity of the second heat exchange system is increased. Its calculation method can refer to the first or second cooling capacity, which will not be elaborated further in this embodiment. The specific parameters of the second heat exchange system can also be determined based on the difference between the third cooling capacity and the preset cooling capacity.

[0114] In practical implementation, the operating mode of each heat exchange system can be directly determined by the difference between the first cooling capacity and the preset cooling capacity. When the difference is large, both heat exchange systems enter heating mode; when the difference is small, only the second heat exchange system enters heating mode. For example, assuming the fresh air temperature is 20℃ and the required indoor temperature is 20℃, both heat exchange systems operate in cooling mode. When the user has a humidification need, the humidification equipment operates according to the humidification requirement. If, after the humidification equipment is turned on, the fresh air outlet temperature is 15℃ due to the high humidification level, and the difference between the outlet temperature and the required temperature is 5℃, then both heat exchange systems enter heating mode. If, after the humidification equipment is turned on, the fresh air outlet temperature is 18℃ due to the low humidification level, and the difference between the outlet temperature and the required temperature is 2℃, then only the second heat exchange system enters heating mode.

[0115] Understandably, once the second heat exchange system can compensate for the temperature drop caused by the humidification equipment, the first heat exchange system can continue to operate in cooling mode, or it can be shut down. That is, when the third cooling capacity is less than the preset cooling capacity, the first heat exchange system is controlled to maintain cooling operation. Simultaneously, if the heating capacity of the second heat exchange system can be further improved, and its energy efficiency can also be further enhanced, while ensuring that the third cooling capacity is less than the preset cooling capacity, the first heat exchange system can be shut down, and the heating capacity of the second heat exchange system can be further increased.

[0116] It should be noted that if the first heat exchange system continues to operate in cooling mode, dehumidification of the fresh air should be avoided. Specifically, the first evaporation temperature is obtained, which is the evaporation temperature of the evaporator in the first heat exchange system. When the first evaporation temperature is lower than the dew point temperature of the fresh air, the heat exchange capacity of the first heat exchange system is reduced to increase the first evaporation temperature. This reduction in the heat exchange capacity can be achieved by decreasing the compressor speed or increasing the opening of the throttling element. For the specific operation mode of cooling without dehumidification, please refer to the first embodiment; this implementation will not be repeated here.

[0117] As another example, the operation of a fresh air system can also be as follows: Assume the fresh air temperature is 20℃, the dew point temperature is 8℃, the exhaust air temperature is 25℃, and the required indoor temperature is 20℃. If the user needs humidification, the second heat exchange system starts heating, the first heat exchange system stops, and the compressor or expansion valve opening in the second heat exchange system is adjusted to heat the fresh air. After humidification by the humidifier, the outlet air temperature is 20℃, meeting the requirements for indoor cooling and humidification. If the outlet air temperature is greater than 20℃, when the indoor temperature rises to 23℃, the first heat exchange system starts cooling without dehumidifying, controlling its evaporation temperature at 15℃. The fresh air is cooled, then heated, and then humidified by the humidifier, resulting in an outlet air temperature of 20℃, meeting the requirements for indoor cooling and humidification.

[0118] In the second embodiment, after the humidification equipment is turned on and causes a temperature drop, the second heat exchange system is preferentially put into the heating mode, and then the operating mode of the first heat exchange system is determined according to the user's needs; thereby eliminating the temperature drop while improving the energy efficiency of the fresh air equipment.

[0119] Reference Figure 5 , Figure 5 This is a flowchart illustrating a third embodiment of the control method for the fresh air device of the present invention. Based on the first and second embodiments described above, a third embodiment of the control method for the fresh air device of the present invention is proposed.

[0120] In the third embodiment, to improve the user experience, after step S20, the following may also be included:

[0121] Step S30: When the humidifier switches from the on state to the off state, determine the current operating mode of each heat exchange system in the fresh air equipment.

[0122] It should be noted that the humidifier can be turned off after the indoor humidity reaches the user's desired level to reduce energy consumption; or the user can directly control the humidifier to turn off. Since the humidifier causes a temperature drop when it is turned on, it will cause a temperature rise when switching off. At this time, the operating parameters of the fresh air system also need to be adjusted to avoid excessively high perceived temperature for the user.

[0123] When the humidifier is on, both the first and second heat exchange systems may be in heating or cooling mode. To quickly adjust the heat exchange capacity of each system, it is necessary to first determine its current operating mode. Specifically, the direction of refrigerant flow can be determined by the rotation of the four-way valve, thus distinguishing between heating and cooling modes. Alternatively, the state of each heat exchanger can be determined by the coil temperature, thus distinguishing between heating and cooling modes.

[0124] Step S40: Compare the fourth cooling capacity output by the fresh air equipment with the set cooling capacity to obtain the cooling capacity comparison result.

[0125] It should be noted that the fourth cooling capacity is the sum of the heating or cooling capacity output by the first heat exchange system and the heating or cooling capacity output by the second heat exchange system. The cooling capacity can be determined based on the user-set preset cooling temperature and the current ambient temperature. For example, after the humidifier is turned off, if the outlet air temperature is 23°C and the required indoor temperature is 20°C, then the fourth cooling capacity is determined to be less than the preset cooling capacity; if the outlet air temperature is 18°C ​​and the required indoor temperature is 20°C, then the fourth cooling capacity is determined to be greater than the preset cooling capacity. The method for determining the cooling capacity can be referred to in the first embodiment, and will not be repeated here.

[0126] Step S50: Adjust the operating parameters of the fresh air equipment based on the current operating mode and the cooling capacity comparison results.

[0127] Understandably, when the cooling capacity comparison result shows that the fourth cooling capacity is less than the preset cooling capacity, the cooling capacity output by the fresh air system needs to be increased; conversely, when the cooling capacity comparison result shows that the fourth cooling capacity is greater than the preset cooling capacity, the cooling capacity output by the fresh air system needs to be decreased. Operating parameters may include compressor speed or throttling element opening, etc.

[0128] It should be noted that since the heat exchange systems in the fresh air equipment may be in heating mode or cooling mode, the adjustment direction of the heat exchange systems in different operating modes will be different when it is necessary to adjust the outlet air temperature of the fresh air equipment.

[0129] Specifically, when it is necessary to increase the cooling capacity output of the fresh air system, if the heat exchange system is in cooling mode, the cooling capacity can be increased by increasing the compressor speed or decreasing the opening of the throttling element, thereby lowering the indoor temperature. If the heat exchange system is in heating mode, the heating capacity can be reduced by decreasing the compressor speed or increasing the opening of the throttling element, thereby lowering the indoor temperature. Conversely, when it is necessary to reduce the cooling capacity output of the fresh air system, if the heat exchange system is in cooling mode, the cooling capacity can be reduced by decreasing the compressor speed or increasing the opening of the throttling element, thereby raising the indoor temperature. If the heat exchange system is in heating mode, the heating capacity can be increased by increasing the compressor speed or increasing the opening of the throttling element, thereby raising the indoor temperature. To improve the energy efficiency of the fresh air system, the second heat exchange system is adjusted first. Of course, the first and second heat exchange systems can also be adjusted simultaneously; the adjustment methods for each heat exchange system are as described above.

[0130] In this embodiment, to quickly adjust the indoor temperature, the speed of the outdoor fan and / or exhaust fan can be reduced to increase the fourth cooling capacity. The overall heat exchange capacity of the fresh air system is reduced, thereby lowering the outlet air temperature. Simultaneously, adjustments to each heat exchange system are made to quickly eliminate the temperature rise caused by the shutdown of the humidifier. (Refer to...) Figure 2 The outdoor fan refers to the first fan, and the exhaust fan is the third fan.

[0131] It should be noted that if a heat exchange system in a fresh air system is in heating mode, and the outlet air temperature cannot be reduced while maintaining heating mode, the heat exchange system can be switched from heating mode to cooling mode to further reduce the outlet air temperature.

[0132] In the third embodiment, when the temperature rises due to the humidification equipment being turned off, the operating parameters are adjusted according to the current operation of each heat exchange system to reduce the outlet air temperature of the fresh air equipment, thereby avoiding an increase in indoor temperature and improving the user experience.

[0133] Furthermore, this invention also proposes a storage medium storing a humidification control program for a fresh air system. When executed by a processor, the humidification control program implements the steps of the humidification control method for the fresh air system described above. Since this storage medium can employ the technical solutions of all the above embodiments, it at least possesses the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon further here.

[0134] In addition, refer to Figure 6 , Figure 6 This is a structural block diagram of an embodiment of the control device for a fresh air system according to the present invention. The present invention also proposes a control device for a fresh air system.

[0135] In this embodiment, the humidification control device for the fresh air equipment is used to control the fresh air equipment. The specific structure of the fresh air equipment can be referred to the foregoing. The control device for the fresh air equipment includes:

[0136] The judgment module 100 is used to determine whether the first cooling capacity output by the fresh air equipment is greater than the preset cooling capacity when the fresh air equipment is in the cooling and humidification mode.

[0137] It should be noted that when the fresh air system is in cooling and humidification mode, both the first and second heat exchange systems operate in cooling mode according to preset operating parameters. Each heat exchanger within the fresh air duct is in an evaporation state to cool the fresh air within the duct. The humidification equipment is on, humidifying the fresh air and simultaneously cooling it. Therefore, the first cooling capacity refers to the sum of the cooling capacities of the first and second heat exchange systems and the humidification equipment; the preset cooling capacity can be determined based on the user-set preset cooling temperature and the current ambient temperature.

[0138] It is understandable that if the humidifier is off and the fresh air system is operating stably, the cooling capacity output by the first and second heat exchange systems will exactly meet the preset cooling capacity. Therefore, when the humidifier is switched on, because it has a cooling effect, the cooling capacity of the first heat exchange system will exceed the preset cooling capacity, even if the operating parameters of the first and second heat exchange systems remain unchanged, making the user feel too cold.

[0139] In this embodiment, to reasonably control the humidification equipment, the fresh air system can determine in real time whether the humidification equipment needs to be turned on. When the humidification equipment needs to be turned on, it is controlled to be in the on state; when the humidification equipment does not need to be turned on, it is controlled to be in the off state. In specific implementation, the humidity content at a set location can be obtained first; and when the detected humidity content is less than the preset humidity content, the humidification equipment is controlled to be turned on.

[0140] It should be noted that the set location can include the indoor environment, the air outlet of the fresh air system, or the air inlet of the fresh air system. When the fresh air system is not humidifying, the humidity at these locations is usually the same. The humidity at these locations reflects the humidity of the user's environment; if the humidity is low, the humidifier can be turned on. The preset humidity can be set by the user or determined by the judgment module 100 based on the current season or time. For example, the preset humidity range for the indoor environment can be 5–14 g / kg, the preset humidity range for the air outlet of the fresh air system can be 5–16 g / kg, and the preset humidity range for the air inlet of the fresh air system can be 5–18 g / kg. Furthermore, the specific operating parameters of the humidifier can be determined based on the difference between the indoor humidity and the preset humidity. Mature technologies already exist for controlling humidifiers, and this embodiment will not elaborate further. Of course, other methods can also be used to control the humidifier's on / off state, and this embodiment does not limit this.

[0141] In this embodiment, to facilitate determining the relationship between the first cooling capacity and the preset cooling capacity, the temperature at various locations within the fresh air system can be detected and judged. Specifically, the detected temperature at a set location can be obtained; the detected temperature can be compared with the preset cooling temperature to obtain a first comparison result; and based on the first comparison result, it can be determined whether the first cooling capacity output by the fresh air system is greater than the preset cooling capacity.

[0142] It should be noted that the set location can also include the indoor environment, the air outlet of the fresh air device, or the air inlet of the fresh air device. The temperature at each location reflects the cooling capacity provided by the fresh air device. The preset cooling temperature can be preset by the user or determined by the judgment module 100 based on the current season or time. For example, the preset cooling temperature for the indoor environment can range from 15 to 32°C; the preset cooling temperature for the air outlet of the fresh air device can range from 5 to 32°C; and the preset cooling temperature for the air inlet of the fresh air device can range from 10 to 50°C. When the indoor temperature is lower than the corresponding preset cooling temperature, the air outlet temperature is lower than the corresponding preset cooling temperature, or the fresh air temperature at the air inlet is lower than the corresponding preset cooling temperature, it indicates that the user's current perceived temperature is low, and the first cooling capacity is determined to be greater than the preset cooling capacity; conversely, the first cooling capacity is determined to be less than or equal to the preset cooling capacity. Of course, other methods can be used to determine the cooling capacity, and this embodiment does not limit this.

[0143] It should be noted that the aforementioned humidity and temperature can be obtained through temperature and humidity sensors. Specifically, temperature and humidity sensors can be pre-installed at the inlet and outlet of the fresh air duct and within the service environment. These sensors are connected to the judgment module 100. The temperature and humidity sensors can provide real-time or intermittent feedback of their location's temperature, humidity, or humidity content signals to the judgment module 100. The judgment module 100 analyzes the received temperature and humidity signals to obtain the temperature, humidity, or humidity content. Furthermore, since the fresh air temperature and humidity content are the same as those of the external environment, the judgment module 100 can also connect to a meteorological database to obtain the fresh air temperature and humidity content by acquiring local meteorological data. Of course, the aforementioned humidity and temperature can also be obtained using other methods, and this embodiment does not limit this.

[0144] The drive module 200 is used to control the first heat exchange system and / or the second heat exchange system to switch from cooling mode to heating mode when the first cooling capacity is greater than the preset cooling capacity, so as to reduce the cooling capacity.

[0145] Understandably, if the humidifier causes the outlet air temperature to drop, resulting in the initial cooling capacity exceeding the preset cooling capacity, the outlet air temperature needs to be increased to avoid user discomfort. In this case, either or both of the first and second heat exchange systems can be switched to heating mode to heat the fresh air.

[0146] Specifically, the switching between heating and cooling modes in the heat exchange system is controlled by a four-way valve. When the heat exchange system switches from cooling mode to heating mode, the direction of the four-way valve is adjusted to change the direction of the heat exchange system piping, thus switching the refrigerant flow direction. The refrigerant flow direction can be referred to the above, and will not be repeated here in this embodiment.

[0147] It should be noted that if the first cooling capacity is less than or equal to the preset cooling capacity, both the first and second heat exchange systems will continue to operate in cooling mode. The operating parameters of the first and second heat exchange systems can be determined based on the difference between the first cooling capacity and the preset cooling capacity. Furthermore, when the first and second heat exchange systems are cooling, dehumidification of the fresh air should be avoided.

[0148] In practical implementation, if the initial cooling capacity is less than the preset cooling capacity, the heat exchange system in the fresh air system will be controlled to operate in cooling mode without dehumidification. That is, both the first and second heat exchange systems will operate in cooling mode, and dehumidification must be avoided. The control method for cooling without dehumidification is as follows: obtain the evaporation temperature of the evaporator in each heat exchange system; when the evaporation temperature is lower than the fresh air dew point temperature, reduce the compressor speed of the corresponding heat exchange system and / or increase the opening of the throttling element of the corresponding heat exchange system.

[0149] Reference Figure 2Each evaporator can be a second or fourth heat exchanger. When the evaporation temperature is lower than the fresh air dew point temperature, the compressor speed in the heat exchange system is reduced, or the opening of the throttling element is increased. Thus, just before the heat exchange system is about to dehumidify the fresh air, the heat exchange capacity of the system is reduced, and the refrigerant temperature inside the evaporator is increased, avoiding dehumidification of the fresh air. This avoids energy waste caused by increasing the operating power of the humidification equipment due to dehumidification of the fresh air during the cooling process.

[0150] In this embodiment, the fresh air device has a two-stage heat exchange system. The first heat exchange system is used to achieve heat exchange between the fresh air duct and the external environment; the second heat exchange system is used to achieve heat exchange between the fresh air duct and the exhaust duct. When the fresh air device enters the cooling and humidification mode, the judgment module 100 determines whether the first cooling capacity output by the fresh air device is greater than the preset cooling capacity. If so, the drive module 200 controls the first heat exchange system and / or the second heat exchange system to switch from the cooling mode to the heating mode to reduce the first cooling capacity. This avoids the outlet air temperature from decreasing after the humidification device is turned on, thus improving the user experience.

[0151] Other embodiments or specific implementations of the control device for the fresh air equipment described in this invention can refer to the above-described method embodiments, and therefore have at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0152] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0153] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. In the unit claims listing several devices, several of these devices may be embodied by the same hardware item. The use of the terms first, second, and third, etc., does not indicate any order and can be interpreted as names.

[0154] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as a read-only memory image (ROM) / random access memory (RAM), magnetic disk, optical disk), and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0155] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method for a fresh air system, characterized in that, The fresh air equipment includes a first heat exchange system, a second heat exchange system, and a humidification device. The first heat exchange system is used for heat exchange between the fresh air duct and the external environment. The second heat exchange system is used for heat exchange between the fresh air duct and the exhaust air duct. The humidification device is installed inside the fresh air duct. The control method includes: When the fresh air device is in cooling and humidifying mode, determine whether the first cooling capacity output by the fresh air device is greater than the preset cooling capacity; When the first cooling capacity is less than the preset cooling capacity, the heat exchange system in the fresh air equipment is controlled to operate in cooling mode without dehumidification. The control method further includes: When the humidification equipment switches from the on state to the off state, the current operating mode of each heat exchange system in the fresh air equipment is determined; The fourth cooling capacity output by the fresh air device is compared with the set cooling capacity to obtain the cooling capacity comparison result; and, The operating parameters of the fresh air equipment are adjusted based on the current operating mode and the comparison result of the cooling capacity.

2. The control method as described in claim 1, characterized in that, The control of the heat exchange system in the fresh air equipment to operate in cooling mode without dehumidification includes: Obtain the evaporation temperature of the evaporator in each heat exchange system; When the evaporation temperature is lower than the fresh air dew point temperature, reduce the compressor speed of the corresponding heat exchange system and / or increase the opening of the throttling element of the corresponding heat exchange system.

3. The control method as described in claim 1, characterized in that, The step of determining whether the first cooling capacity output by the fresh air device is greater than the preset cooling capacity includes: Obtain the detection temperature corresponding to the set location; The detected temperature is compared with the preset cooling temperature to obtain a first comparison result; and, Based on the first comparison result, it is determined whether the first cooling capacity output by the fresh air device is greater than the preset cooling capacity.

4. The control method as described in claim 1, characterized in that, Before determining whether the first cooling capacity output by the fresh air device is greater than the preset cooling capacity, the method further includes: Obtain the moisture content at the specified location; and, When the detected moisture content is less than the preset moisture content, the humidification device is controlled to be turned on.

5. The control method as described in claim 1, characterized in that, Both the first heat exchange system and the second heat exchange system include a compressor and a throttling element; adjusting the operating parameters of the fresh air equipment based on the current operating mode and the cooling capacity comparison result includes: When the fourth cooling capacity is less than the preset cooling capacity, the compressor speed and / or the opening degree of the throttling element corresponding to the heat exchange system operating in cooling mode are increased, and / or the compressor speed and / or the opening degree of the throttling element corresponding to the heat exchange system operating in heating mode are decreased. When the fourth cooling capacity is greater than the preset cooling capacity, the compressor speed and / or the opening degree of the throttling element corresponding to the heat exchange system operating in cooling mode are reduced, and / or the compressor speed and / or the opening degree of the throttling element corresponding to the heat exchange system operating in heating mode are increased.

6. A control device for a fresh air system, characterized in that, The fresh air equipment includes a first heat exchange system, a second heat exchange system, and a humidification device. The first heat exchange system is used for heat exchange between the fresh air duct and the external environment. The second heat exchange system is used for heat exchange between the fresh air duct and the exhaust duct. The humidification device is installed in the fresh air duct. The control device of the fresh air equipment executes the control method of the fresh air equipment according to any one of claims 1 to 5. The control device for the fresh air equipment includes: The judgment module is used to determine whether the first cooling capacity output by the fresh air device is greater than the preset cooling capacity when the fresh air device is in the cooling and humidification mode. as well as, The drive module is used to control the heat exchange system in the fresh air equipment to operate in a cooling-only mode when the first cooling capacity is less than the preset cooling capacity.

7. A fresh air device, characterized in that, The fresh air device includes: a first heat exchange system, a second heat exchange system, a humidifier, a memory, a processor, and a control program for the fresh air device stored in the memory and executable on the processor. The first heat exchange system is used for heat exchange between the fresh air duct and the external environment, and the second heat exchange system is used for heat exchange between the fresh air duct and the exhaust duct. When the control program for the fresh air device is executed by the processor, it implements the control method for the fresh air device as described in any one of claims 1 to 5.

8. The fresh air equipment as described in claim 7, characterized in that, The fresh air system has a fresh air duct and an exhaust air duct. The first heat exchange system includes a first compressor, a first four-way valve, a first heat exchanger, a first throttling element, and a second heat exchanger. The second heat exchange system includes a second compressor, a second four-way valve, a third heat exchanger, a second throttling element, and a fourth heat exchanger. When the first heat exchange system is in cooling mode, the refrigerant output from the first compressor passes sequentially through the first four-way valve, the first heat exchanger, the first throttling element, and the second heat exchanger. When the second heat exchange system is in cooling mode, the refrigerant output from the second compressor passes sequentially through the second four-way valve, the third heat exchanger, the second throttling element, and the fourth heat exchanger. The first heat exchanger is located in the external environment; The fresh air duct is provided with, in sequence from outdoors to indoors, a second heat exchanger, a fourth heat exchanger, a humidifier, and a fresh air fan; and... The exhaust duct is equipped with the third heat exchanger and the exhaust fan.

9. The fresh air equipment as described in claim 8, characterized in that, The first heat exchange system further includes a third throttling element and a fifth heat exchanger. One end of the fifth heat exchanger is connected to the first compressor, and the other end of the fifth heat exchanger is connected to one end of the second heat exchanger through the third throttling element. The fifth heat exchanger is disposed within the fresh air duct. The second heat exchange system further includes a fourth throttling element and a sixth heat exchanger. One end of the sixth heat exchanger is connected to the second compressor, and the other end of the sixth heat exchanger is connected to one end of the fourth heat exchanger through the fourth throttling element. The sixth heat exchanger is disposed within the fresh air duct.

10. A storage medium, characterized in that, The storage medium stores a control program for a fresh air device, which, when executed by a processor, implements the control method for the fresh air device as described in any one of claims 1 to 5.

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