A control method of a bidirectional flow dehumidifier

Abstract

The application discloses a control method of a bidirectional flow dehumidifier, which comprises the following steps: after power-on, inputting a fan control and gear signal, and simultaneously performing dehumidification mode judgment; after the fan receives the control and gear signal, completing the opening or closing of the fan according to the control signal; and then according to the gear signal, giving a fan speed voltage, and further adjusting the rotating speed to run; and in the running process of the fan, the gear signal is acquired in real time, and a complete dehumidification system is formed. The application has the advantages that the application effectively solves the contradiction between high outdoor humidity and high user requirement for dehumidification. By controlling the opening and closing of each air valve, the temperature rising internal circulation dehumidification and the isothermal internal circulation dehumidification are realized, and the noise is reduced.

Description

Technical Field

[0001] This invention belongs to the field of fresh air systems, and specifically relates to a control method for a two-way flow dehumidifier. Background Technology

[0002] With continuous iterations in technology and regulations, building airtightness has been constantly improved, leading to a decrease in the rate of natural indoor air exchange. Simultaneously, people's demands for quality of life are constantly increasing, resulting in higher requirements for indoor air quality. This creates a certain contradiction between people's need for fresh air and the improvement of building airtightness, leading to the development of fresh air systems. These devices can process outdoor air and then deliver it indoors. Based on fresh air systems, modules with other functions, such as dehumidification, have gradually been developed. Fresh air and dehumidification together constitute the fresh air dehumidifier. Fresh air dehumidifiers are further divided into two main categories based on airflow type: unidirectional flow and bidirectional flow.

[0003] Two-way flow dehumidifiers are currently mainly used in applications requiring both fresh air intake and dehumidification. Most mainstream two-way flow dehumidifiers on the market have two airflow channels: one for processing and delivering fresh outdoor air into the room, and the other for exhausting indoor air to the outside. These two channels work together to quickly improve indoor air quality.

[0004] The current mainstream dual-flow architecture remains unchanged, resulting in high moisture content in outdoor air under relatively high temperature and humidity conditions. This outdoor air undergoes only one treatment at the evaporator before being delivered indoors. Because the cooling capacity of the dehumidifier's refrigeration module is limited, the moisture content cannot be kept very low. The delivery of this high-humidity air indoors leads to an increase in indoor humidity.

[0005] Currently, the mainstream bidirectional airflow dehumidifier architecture has two fixed airflow channels, one for supplying fresh air and the other for exhausting air. The fresh air channel contains a filter, evaporator, condenser, heat exchange core, fresh air unit, and supply fan; the exhaust air channel contains a filter, heat exchange core, compressor, and exhaust fan. Some manufacturers also install a condenser in the exhaust air channel to dissipate some heat to the outside. Summary of the Invention

[0006] The purpose of this invention is to provide a control method for a two-way flow dehumidifier, thereby resolving the contradiction between the high outdoor humidity and the significant user demand for dehumidification.

[0007] The technical solution of this invention is: a control method for a bidirectional flow dehumidifier, which is applied to the bidirectional flow dehumidifier, wherein the bidirectional flow dehumidifier includes: a main body, a fresh air valve installed on one side of the main body, an evaporator-condenser disposed in the center of the main body, an internal circulation valve arranged adjacent to the evaporator-condenser, a heat exchange core horizontally placed inside the main body, an exhaust fan installed on one side of the heat exchange core, a supply fan installed downstream of the heat exchange core, and a compressor installed inside the main body and downstream of the heat exchange core; the control method for the bidirectional flow dehumidifier includes:

[0008] S1. Power on the dehumidifier. The fan control module and compressor control module start synchronously and proceed to steps S2 and S4 respectively.

[0009] S2. Input fan control, speed adjustment and mode signals to the fan control module. The fan mode signals are divided into: bidirectional flow fresh air mode signal, mixed air mode signal, heating internal circulation mode signal, and isothermal internal circulation mode signal. Proceed to step S3.

[0010] S3. Determine the on / off status, gear position, and mode of the exhaust fan and the supply fan based on the fan control, gear adjustment, and mode signals. At the same time, the exhaust fan and the supply fan acquire the gear position and mode signals in real time and feed back the operation signals of the exhaust fan and the supply fan to the compressor control module, and proceed to step S6.

[0011] S4. Input the dehumidification mode signal to the compressor control module and proceed to step S5;

[0012] S5. Determine the dehumidification mode switch based on the dehumidification mode signal. If the dehumidification mode is off, the compressor will be turned off until the end of the operation. If the dehumidification mode is on, proceed to step S6.

[0013] S6. The compressor control module determines the dehumidification mode switch based on the opening and closing of the exhaust fan and the supply fan. If neither the exhaust fan nor the supply fan is running, the compressor will be turned off until the end of the operation. If at least one of the exhaust fan and the supply fan is running, the process proceeds to step S7.

[0014] S7. The compressor control module determines the dehumidification mode switch based on the humidity. If the humidity does not meet the compressor start-up conditions or the humidity meets the compressor start-up conditions and a shutdown signal is received, the compressor will shut down until the work is finished. If the humidity meets the compressor start-up conditions, the compressor will start running and continuously monitor the indoor humidity, repeating this process.

[0015] Based on the above technical solution, the following supplementary technical solutions are further included:

[0016] Preferably, in step S7, the compressor is started when the indoor humidity is higher than the user-set relative humidity target.

[0017] Preferably, step S3, which determines the speed and mode of the exhaust fan and the supply fan based on the fan speed adjustment signal, includes the following steps:

[0018] S31. The speed control voltage of the air supply fan is given according to the gear position signal, and the speed is adjusted to run. The gear position signal is obtained in real time until the work ends. At the same time, the fresh air valve, the internal circulation valve, and the exhaust fan obtain the mode signal in real time and proceed to step S32.

[0019] S32. The fresh air valve, internal circulation valve, and exhaust fan are controlled to open and close according to the mode signal: When a heating internal circulation mode signal is received, the internal circulation valve is opened, and the fresh air valve and exhaust fan are closed until the work is completed; when an isothermal internal circulation mode signal is received, the internal circulation valve and exhaust fan are opened, and the fresh air valve is closed, proceeding to step S33; when a mixed air mode signal is received, the fresh air valve, internal circulation valve, and exhaust fan are opened, proceeding to step S33; when a bidirectional flow 100% fresh air mode signal is received, the fresh air valve and exhaust fan are opened, and the internal circulation valve is closed, proceeding to step S33.

[0020] S33. The exhaust fan speed control voltage is given according to the gear signal, and the speed is adjusted accordingly. The gear signal and mode signal are acquired in real time until the operation ends.

[0021] Preferably, in step S31, the blower is divided into high, medium and low speeds according to the received speed signal, and the corresponding speed regulation voltages are speed regulation voltage Vh, speed regulation voltage Vm and speed regulation voltage Vl, respectively.

[0022] Preferably, in step S33, when the isothermal internal circulation mode signal is received, the exhaust fan is divided into high, medium, and low speeds according to the received speed signal, and the corresponding given speed regulation voltages are Vhy, Vmy, and Vly, respectively; when the bidirectional flow fresh air mode signal is received, the exhaust fan is divided into high, medium, and low speeds according to the received speed signal, and the corresponding given speed regulation voltages are Vhx, Vmx, and Vlx, respectively; when the mixed air mode signal is received, the exhaust fan is divided into high, medium, and low speeds according to the received speed signal, and the corresponding given speed regulation voltages are Vhz, Vmz, and Vlz, respectively.

[0023] Preferably, in step S32, when the mixed air mode signal is received, the air volume supplied by the exhaust fan is greater than the air volume supplied by the supply fan.

[0024] Preferably, the bidirectional flow dehumidifier further includes: a fresh air filter installed inside the main body and downstream of the fresh air valve, a return air filter installed inside the main body and upstream of the exhaust fan, a fresh air inlet flange installed on the main body, an exhaust outlet flange installed on the main body, a return air inlet flange installed on the main body, and an indoor air supply outlet flange installed on the main body.

[0025] Preferably, in step S32,

[0026] When the heating internal circulation mode signal is received, the air duct route is as follows: return air inlet flange, return air filter, heat exchange core, internal circulation air valve, evaporator condenser, heat exchange core, air supply fan, indoor air supply outlet flange;

[0027] When the isothermal internal circulation mode signal is received, the air duct route is as follows: return air inlet flange, return air filter, exhaust fan, heat exchange core, internal circulation air valve, evaporator condenser, heat exchange core, supply air fan, indoor air supply outlet flange;

[0028] When the mixed air mode signal is received, the outdoor fresh air direction is: fresh air inlet flange, fresh air damper, evaporative condenser, heat exchange core, air supply fan, indoor air supply outlet flange; the indoor air direction is: return air inlet flange, return air filter, exhaust fan, heat exchange core, internal circulation damper, evaporative condenser, heat exchange core, air supply fan, indoor air supply outlet flange.

[0029] When a bidirectional fresh air mode signal is received, the outdoor fresh air direction is: fresh air inlet flange, fresh air valve, evaporative condenser, heat exchange core, air supply fan, indoor air supply outlet flange, and the indoor air direction is: return air inlet flange, return air filter, exhaust fan, heat exchange core, auxiliary condenser, exhaust outlet flange.

[0030] Advantages of this invention: This invention effectively solves the contradiction between high outdoor humidity and high user demand for dehumidification. By controlling the opening and closing of each air valve, it achieves heated internal circulation dehumidification and isothermal internal circulation dehumidification, while also reducing noise. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is an exploded view of the present invention;

[0033] Figure 2 This is a top view of the present invention;

[0034] Figure 3 This is the control flowchart of the present invention. Detailed Implementation

[0035] Example: Refer to Figure 1-3 As shown, this invention discloses an embodiment of a control method for a bidirectional flow dehumidifier. The control method is applied to a bidirectional flow dehumidifier, which includes: a main body 1, a fresh air valve 2 installed on one side of the main body 1, an evaporator-condenser 4 located in the center of the main body 1, an internal circulation valve 5 arranged adjacent to the evaporator-condenser 4, a heat exchange core 6 horizontally placed inside the main body 1, an exhaust fan 7 installed on one side of the heat exchange core 6, a supply fan 9 installed downstream of the heat exchange core 6, and a compressor 10 installed inside the main body 1 and downstream of the heat exchange core 6. The control method for the bidirectional flow dehumidifier includes:

[0036] S1. Power on the dehumidifier. The fan control module and compressor control module start synchronously and proceed to steps S2 and S4 respectively.

[0037] S2. Input fan control, speed adjustment and mode signals to the fan control module. The fan mode signals are divided into: bidirectional flow fresh air mode signal, mixed air mode signal, heating internal circulation mode signal, and isothermal internal circulation mode signal. Proceed to step S3.

[0038] S3. Determine the on / off status, gear position, and mode of exhaust fan 7 and supply fan 9 based on the fan control, gear adjustment, and mode signals. At the same time, exhaust fan 7 and supply fan 9 acquire gear position and mode signals in real time and feed back the operation signals of exhaust fan 7 and supply fan 9 to the compressor control module, and proceed to step S6.

[0039] S4. Input the dehumidification mode signal to the compressor control module and proceed to step S5;

[0040] S5. Determine the dehumidification mode switch based on the dehumidification mode signal. If the dehumidification mode is off, the compressor 10 will shut down until the end of the operation. If the dehumidification mode is on, proceed to step S6.

[0041] S6. The compressor control module determines the dehumidification mode switch based on the opening and closing of the exhaust fan 7 and the supply fan 9. If neither the exhaust fan 7 nor the supply fan 9 is running, the compressor 10 will be turned off until the end of the work. If at least one of the exhaust fan 7 and the supply fan 9 is running, then proceed to step S7.

[0042] S7. The compressor control module determines the dehumidification mode switch based on the humidity. If the humidity does not meet the compressor 10 start-up conditions or the humidity meets the compressor 10 start-up conditions and a shutdown signal is received, the compressor 10 will shut down until the work is finished. If the humidity meets the compressor 10 start-up conditions, the compressor 10 will start running and continuously monitor the indoor humidity, repeating this process.

[0043] In the above steps, the fan control module and the compressor control module are controlled independently, and the compressor control module will perform three dehumidification mode on / off checks in sequence. After receiving the fan on / off signal, the fan control module will feed back the on / off signal to the compressor control module for a second dehumidification mode on / off check.

[0044] Step S3, which determines the speed and mode of the exhaust fan 7 and the supply fan 9 based on the fan speed adjustment signal, includes the following steps:

[0045] S31. The speed control voltage of the air supply fan 9 is given according to the gear position signal, and the speed is adjusted to run. The gear position signal is obtained in real time until the work ends. At the same time, the fresh air valve 2, the internal circulation valve 5, and the exhaust fan 7 obtain the mode signal in real time and proceed to step S32.

[0046] S32. The fresh air valve 2, the internal circulation valve 5, and the exhaust fan 7 are controlled to open and close according to the mode signal: When a heating internal circulation mode signal is received, the internal circulation valve 5 is opened, and the fresh air valve 2 and the exhaust fan 7 are closed until the work is completed; when an isothermal internal circulation mode signal is received, the internal circulation valve 5 and the exhaust fan 7 are opened, and the fresh air valve 2 is closed, proceeding to step S33; when a mixed air mode signal is received, the fresh air valve 2, the internal circulation valve 5, and the exhaust fan 7 are opened, proceeding to step S33; when a bidirectional flow 100% fresh air mode signal is received, the fresh air valve 2 and the exhaust fan 7 are opened, and the internal circulation valve 5 is closed, proceeding to step S33.

[0047] S33. The speed control voltage of the exhaust fan 7 is given according to the gear signal, and the speed is adjusted to run. The gear signal and mode signal are obtained in real time until the operation ends.

[0048] In step S31, the blower 9 is divided into high, medium and low speeds according to the received speed signal, and the corresponding speed regulation voltages are speed regulation voltage Vh, speed regulation voltage Vm and speed regulation voltage Vl, respectively.

[0049] In step S32, when the mixed air mode signal is received, the air volume of the exhaust fan 7 is greater than the air volume of the supply fan 9.

[0050] The bidirectional flow dehumidifier further includes: a fresh air filter 3 installed inside the main body 1 and downstream of the fresh air valve 2; a return air filter 8 installed inside the main body 1 and upstream of the exhaust fan 7; a fresh air inlet flange 101 installed on the main body 1; an exhaust outlet flange 102 installed on the main body 1; a return air inlet flange 103 installed on the main body 1; and an indoor air supply outlet flange 104 installed on the main body 1.

[0051] In step S32,

[0052] When the heating internal circulation mode signal is received, the air duct direction is as follows: return air inlet flange 103, return air filter 8, heat exchange core 6, internal circulation air valve 5, evaporator condenser 4, heat exchange core 6, air supply fan 9, indoor air supply outlet flange 104.

[0053] When the isothermal internal circulation mode signal is received, the air duct direction is as follows: return air inlet flange 103, return air filter 8, exhaust fan 7, heat exchange core 6, internal circulation air valve 5, evaporator condenser 4, heat exchange core 6, air supply fan 9, indoor air supply outlet flange 104.

[0054] When the mixed air mode signal is received, the outdoor fresh air direction is: fresh air inlet flange (101), fresh air damper 2, evaporator condenser 4, heat exchange core 6, air supply fan 9, indoor air supply outlet flange 104, and the indoor air direction is: return air inlet flange 103, return air filter 8, exhaust fan 7, heat exchange core 6, internal circulation damper 5, evaporator condenser 4, heat exchange core 6, air supply fan 9, indoor air supply outlet flange 104;

[0055] When a bidirectional fresh air mode signal is received, the outdoor fresh air direction is: fresh air inlet flange 101, fresh air valve 2, evaporative condenser 4, heat exchange core 6, air supply fan 9, indoor air supply outlet flange 104, and the indoor air direction is: return air inlet flange 103, return air filter 8, exhaust fan 7, heat exchange core 6, auxiliary condenser 11, exhaust outlet flange 102.

[0056] In step S33, upon receiving the isothermal internal circulation mode signal, the exhaust fan 7 is divided into high, medium, and low speeds according to the received speed signal, with corresponding speed regulation voltages Vhy, Vmy, and Vly, respectively; upon receiving the bidirectional flow fresh air mode signal, the exhaust fan 7 is divided into high, medium, and low speeds according to the received speed signal, with corresponding speed regulation voltages Vhx, Vmx, and Vlx, respectively; upon receiving the mixed air mode signal, the exhaust fan 7 is divided into high, medium, and low speeds according to the received speed signal, with corresponding speed regulation voltages Vhz, Vmz, and Vlz, respectively.

[0057] In step S5, the compressor 10 is turned on when the indoor humidity is higher than the user-set relative humidity target.

[0058] In internal circulation mode, it can perform heating dehumidification in winter and isothermal dehumidification in summer; in mixed air mode, exhaust fan 7 actively delivers exhaust air to ensure that the return air accounts for a certain proportion of the overall air volume, reducing the burden on supply fan 9, so that supply fan 9 can complete the delivery of the target air volume at a lower speed, thereby reducing noise.

[0059] Advantages of this invention: This invention effectively solves the contradiction between high outdoor humidity and high user demand for dehumidification. By controlling the opening and closing of each air valve, it achieves heated internal circulation dehumidification and isothermal internal circulation dehumidification, while also reducing noise.

[0060] Of course, the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent transformations or modifications made according to the spirit and essence of the main technical solution of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A control method for a bidirectional flow dehumidifier, the control method being applied to the bidirectional flow dehumidifier, wherein the bidirectional flow dehumidifier comprises: The main body (1), a fresh air valve (2) installed on one side of the main body (1), an evaporator-condenser (4) located in the center of the main body (1), an internal circulation air valve (5) arranged adjacent to the evaporator-condenser (4), a heat exchange core (6) horizontally placed inside the main body (1), an exhaust fan (7) installed on one side of the heat exchange core (6) and equipped with a fan control module, a supply fan (9) installed downstream of the heat exchange core (6) and equipped with a fan control module, and a compressor (10) installed inside the main body (1) and equipped with a compressor control module; characterized in that: the control method includes: S1. Power on the dehumidifier. The fan control module and compressor control module start synchronously and proceed to steps S2 and S4 respectively. S2. Input fan control, speed adjustment and mode signals to the fan control module. The fan mode signals are divided into: bidirectional flow fresh air mode signal, mixed air mode signal, heating internal circulation mode signal, and isothermal internal circulation mode signal. Proceed to step S3. S3. Determine the switch, gear and mode of the exhaust fan (7) and the supply fan (9) based on the fan control, gear adjustment and mode signals. At the same time, the exhaust fan (7) and the supply fan (9) obtain the gear and mode signals in real time and feed back the operation signals of the exhaust fan (7) and the supply fan (9) to the compressor control module, and proceed to step S6. S4. Input the dehumidification mode signal to the compressor control module and proceed to step S5; S5. Determine the dehumidification mode switch based on the dehumidification mode signal. If the dehumidification mode is off, the compressor (10) will be turned off until the end of the work. If the dehumidification mode is on, proceed to step S6. S6. The compressor control module determines the dehumidification mode switch based on the operation signals of the exhaust fan (7) and the supply fan (9). If neither the exhaust fan (7) nor the supply fan (9) is running, the compressor (10) will be turned off until the end of the work. If at least one of the exhaust fan (7) and the supply fan (9) is running, then proceed to step S7. S7. The compressor control module determines the dehumidification mode switch based on the humidity. If the humidity does not meet the compressor (10) start-up conditions or the humidity meets the compressor (10) start-up conditions and a shutdown signal is received, the compressor (10) will shut down until the work is finished. If the humidity meets the compressor (10) start-up conditions, the compressor (10) will start running and continuously detect the indoor humidity, repeating this step.

2. The control method for the bidirectional flow dehumidifier according to claim 1, characterized in that: In step S7, the compressor (10) is turned on when the indoor humidity is higher than the relative humidity target set by the user.

3. The control method for the bidirectional flow dehumidifier according to claim 1, characterized in that: The step S3, which determines the gear and mode of the exhaust fan (7) and the supply fan (9) based on the fan gear adjustment signal, includes the following steps: S31. The speed control voltage of the air supply fan (9) is given according to the gear signal, and the speed is adjusted to run. The gear signal is obtained in real time until the work ends. At the same time, the fresh air valve (2), the internal circulation valve (5), and the exhaust fan (7) obtain the mode signal in real time and enter step S32. S32. The fresh air valve (2), the internal circulation valve (5), and the exhaust fan (7) are controlled to open and close according to the mode signal: When the heating internal circulation mode signal is received, the internal circulation valve (5) is opened and the fresh air valve (2) and the exhaust fan (7) are closed until the work is completed; when the isothermal internal circulation mode signal is received, the internal circulation valve (5) and the exhaust fan (7) are opened and the fresh air valve (2) is closed, and the process proceeds to step S33; when the mixed air mode signal is received, the fresh air valve (2), the internal circulation valve (5), and the exhaust fan (7) are opened, and the process proceeds to step S33; when the bidirectional flow fresh air mode signal is received, the fresh air valve (2) and the exhaust fan (7) are opened and the internal circulation valve (5) is closed, and the process proceeds to step S33. S33. The speed control voltage of the exhaust fan (7) is given according to the gear signal, and the speed is adjusted to run. The gear signal and mode signal are obtained in real time until the work ends.

4. The control method for the bidirectional flow dehumidifier according to claim 3, characterized in that: In step S31, the blower (9) is divided into high, medium and low gears according to the received gear signal, and the corresponding given speed regulation voltages are speed regulation voltage Vh, speed regulation voltage Vm and speed regulation voltage Vl, respectively.

5. The control method for the bidirectional flow dehumidifier according to claim 3, characterized in that: In step S33, when the isothermal internal circulation mode signal is received, the exhaust fan (7) is divided into high, medium and low speed according to the received speed signal, and the corresponding given speed regulation voltages are speed regulation voltage Vhy, speed regulation voltage Vmy and speed regulation voltage Vly, respectively; when the bidirectional flow fresh air mode signal is received, the exhaust fan (7) is divided into high, medium and low speed according to the received speed signal, and the corresponding given speed regulation voltages are speed regulation voltage Vhx, speed regulation voltage Vmx and speed regulation voltage Vlx, respectively; when the mixed air mode signal is received, the exhaust fan (7) is divided into high, medium and low speed according to the received speed signal, and the corresponding given speed regulation voltages are speed regulation voltage Vhz, speed regulation voltage Vmz and speed regulation voltage Vlz, respectively.

6. The control method for the bidirectional flow dehumidifier according to claim 3, characterized in that: In step S32, when the mixed air mode signal is received, the air volume of the exhaust fan (7) is greater than the air volume of the supply fan (9).

7. The control method for the bidirectional flow dehumidifier according to claim 1, characterized in that... The bidirectional flow dehumidifier further includes: a fresh air filter (3) installed inside the main body (1) and downstream of the fresh air valve (2); a return air filter (8) installed inside the main body (1) and upstream of the exhaust fan (7); a fresh air inlet flange (101) installed on the main body (1); an exhaust outlet flange (102) installed on the main body (1); a return air inlet flange (103) installed on the main body (1); and an indoor air supply outlet flange (104) installed on the main body (1).

8. The control method for the bidirectional flow dehumidifier according to claim 3, characterized in that: In step S32 When the heating internal circulation mode signal is received, the air duct direction is as follows: return air inlet flange (103), return air filter (8), heat exchange core (6), internal circulation air valve (5), evaporator condenser (4), heat exchange core (6), air supply fan (9), indoor air supply outlet flange (104). When the isothermal internal circulation mode signal is received, the air duct direction is as follows: return air inlet flange (103), return air filter (8), exhaust fan (7), heat exchange core (6), internal circulation air valve (5), evaporator condenser (4), heat exchange core (6), air supply fan (9), indoor air supply outlet flange (104). When the mixed air mode signal is received, the outdoor fresh air direction is: fresh air inlet flange (101), fresh air valve (2), evaporator condenser (4), heat exchange core (6), air supply fan (9), indoor air supply outlet flange (104), and the indoor air direction is: return air inlet flange (103), return air filter (8), exhaust fan (7), heat exchange core (6), internal circulation air valve (5), evaporator condenser (4), heat exchange core (6), air supply fan (9), indoor air supply outlet flange (104). When the bidirectional fresh air mode signal is received, the outdoor fresh air direction is: fresh air inlet flange (101), fresh air valve (2), evaporator condenser (4), heat exchange core (6), air supply fan (9), indoor air supply outlet flange (104), and the indoor air direction is: return air inlet flange (103), return air filter (8), exhaust fan (7), heat exchange core (6), auxiliary condenser (11), exhaust outlet flange (102).

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