An air temperature and humidity regulation system and control method without refrigerant

Abstract

The present invention relates to the field of temperature and humidity control equipment, and discloses a refrigerant-free air temperature and humidity control system, including a through-tube fin heat exchanger, one side of the through-tube fin heat exchanger is a return air port b and a fresh air port b, and the other side is connected to the air port through a blower, an isenthalpic cooler is located below the through-tube fin heat exchanger, and an air mixing adjustment device located at the bottom of the through-tube fin heat exchanger is provided above one side of the isenthalpic cooler, a waste heat recovery device is located above the preheating cooler, and an air drying wheel is located on one side of the waste heat recovery device. When the fresh air temperature and humidity value of the fresh air temperature and humidity sensor is greater than the room temperature and humidity setting value, the device starts the cooling and dehumidification mode, and when the fresh air temperature and humidity value of the fresh air temperature and humidity sensor is less than or equal to the room temperature and humidity setting value, the device starts the natural ventilation mode. The air coming in from the indoor return air is cooled after being combined with the indoor return air and fresh air passing through the through-tube fin heat exchanger, so as to avoid the use of additional refrigeration devices and effectively save energy.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature and humidity regulation equipment, and specifically to a refrigerant-free air temperature and humidity regulation system and control method. Background Art

[0002] In living and working environments, a fresh air system is often required to keep the indoor air temperature and humidity constant. Then, the fresh air system needs to exchange indoor air and outdoor air. In traditional fresh air systems, after indoor return air enters the fresh air system, it is directly forced to cool through a refrigerant. The use and emission of the refrigerant not only waste energy but also cause environmental pollution.

[0003] In document CN 105605705 B, an evaporative cooling temperature and humidity independent control fresh air unit for dry areas is disclosed, which includes a unit housing. An air inlet is provided on one side wall of the unit housing. A filtering device and an evaporative cooling temperature and humidity independent control unit are sequentially arranged in the unit housing according to the flowing direction of air after entering. The cooling of air needs to be achieved through an independent evaporative cooling temperature and humidity control unit.

[0004] Although this structure can also effectively regulate the air temperature, it requires an additional independent evaporative cooling temperature and humidity control unit to control it. In this way, additional devices and additional energy are required. Although the purpose of cooling and control can also be achieved, energy will be wasted. Summary of the Invention

[0005] In order to solve the above problems, the present invention discloses a refrigerant-free air temperature and humidity regulation system and control method, which cools the air entering from indoor return air and the mixture of indoor return air and fresh air passing through a finned tube heat exchanger, avoiding the use of additional refrigeration devices and effectively saving energy.

[0006] The technical solution of the present invention is: a refrigerant-free air temperature and humidity control system, including a through-tube fin heat exchanger, one side of the through-tube fin heat exchanger is a return air port b and a fresh air port b, and the other side is connected to the air supply port through the blower, and the bottom of the through-tube fin heat exchanger is a control box, an isenthalpic cooler, a precooling cooler, a waste heat recovery device, an air drying wheel and a return air port a, the isenthalpic cooler is located below the through-tube fin heat exchanger, and a mixed air adjustment device located at the bottom of the through-tube fin heat exchanger is provided above one side of the isenthalpic cooler, and the waste heat recovery device is provided at the bottom of the through-tube fin heat exchanger. The collector is located above the pre-cooling cooler, the air drying wheel is located on one side of the waste heat recovery device, return air temperature and humidity sensors are provided at the return air inlet a and the return air inlet b, a temperature and humidity sensor after the drying wheel is provided between the lower part of the air drying wheel and the pre-cooling cooler, a supply air temperature and humidity sensor is provided at the supply air outlet, a fresh air temperature and humidity sensor is provided at the fresh air outlet, a temperature sensor after pre-cooling is provided at the return fan, a temperature sensor after isenthalpic cooling is provided on one side of the isenthalpic cooler, and a temperature sensor after waste heat recovery is provided between the upper part of the air drying wheel and the waste heat recovery device.

[0007] Furthermore, an exhaust port is provided at the top of the through-tube fin type heat exchanger, and an air filter is provided on the side of the through-tube fin type heat exchanger close to the return air port b.

[0008] Furthermore, an exhaust fan is provided on one side of the air drying wheel, and a wet air outlet is provided on the outer side of the exhaust fan. The wet air outlet, the exhaust fan, the air drying wheel, the waste heat recovery device and the fresh air inlet are in a straight line.

[0009] Furthermore, a return air fan is provided on one side of the precooler near the isenthalpic cooler, and a return air inlet a is provided on the other side of the precooler. The return air inlet a, the air drying wheel, the return air fan and the precooler are in a straight line.

[0010] Furthermore, the return air temperature and humidity sensor, the temperature and humidity sensor, the supply air temperature and humidity sensor, the fresh air temperature and humidity sensor, the temperature sensor after waste heat recovery, the temperature sensor after pre-cooling and the temperature sensor after isenthalpic cooling are respectively connected to the controller CPP1.

[0011] Furthermore, the fresh air inlet b is located below the return air inlet b.

[0012] A control method for a refrigerant-free air temperature and humidity control system, a refrigerant-free air temperature and humidity control system intelligently determines the working mode, when the fresh air temperature and humidity value of the fresh air temperature and humidity sensor is greater than the room temperature and humidity setting value, the device starts the cooling and dehumidification mode, when the fresh air temperature and humidity value of the fresh air temperature and humidity sensor is less than or equal to the room temperature and humidity setting value, the device starts the natural ventilation mode:

[0013] Cooling and dehumidification working mode:

[0014] a. When the return air temperature T > the room temperature set value + △T and the return air humidity H > the room humidity set value + △H, the following steps are included:

[0015] Step 1: The mixing air regulating device, supply fan, waste heat recovery device, air drying runner, exhaust fan, return air fan, enthalpy equalizing cooler, finned tube heat exchanger, and pre-cooling cooler are put into operation.

[0016] Step 2: The waste heat recovery device is put into maximum operation, the pre-cooling cooler is put into maximum operation, the return air fan and the exhaust fan are started, and an alarm is given if there is a fault.

[0017] Step 3: The enthalpy equalizing cooler operates according to the difference between the return air temperature T and the room temperature set value by PID, and the difference between the return air humidity H and the room humidity set value controls the mixing air regulating device by PID. The supply air temperature and humidity of the supply air temperature and humidity sensor are used as monitoring feedback.

[0018] b. When the return air temperature T > the room temperature set value + △T and the return air humidity H ≤ the room humidity set value - △H, the following steps are included:

[0019] Step 1: The mixing air regulating device, supply fan, waste heat recovery device, air drying runner, exhaust fan, return air fan, enthalpy equalizing cooler, finned tube heat exchanger, and pre-cooling cooler are put into operation.

[0020] Step 2: The waste heat recovery device is put into maximum operation, the pre-cooling cooler is put into maximum operation, the return air fan and the exhaust fan are started, and an alarm is given if there is a fault.

[0021] Step 3: The enthalpy equalizing cooler operates according to the difference between the return air temperature T and the room temperature set value by PID, the mixing air regulating device is closed, and the supply air temperature and humidity of the supply air temperature and humidity sensor are used as monitoring feedback.

[0022] c. When the return air temperature T ≤ the room temperature set value - △T and the return air humidity H > the room humidity set value + △H, the following steps are included:

[0023] Step 1: The mixing air regulating device, supply fan, waste heat recovery device, air drying runner, exhaust fan, return air fan, enthalpy equalizing cooler, finned tube heat exchanger, and pre-cooling cooler are put into operation.

[0024] Step 2: The waste heat recovery device is put into maximum operation, the pre-cooling cooler is put into maximum operation, the return air fan and the exhaust fan are started, and an alarm is given if there is a fault. The enthalpy equalizing cooler is closed.

[0025] Step 3: The mixing air regulating device is closed, and the supply air temperature and humidity of the supply air temperature and humidity sensor are used as monitoring feedback.

[0026] d. When the return air temperature T ≤ the room temperature set value - △T (temperature dead zone) and the return air humidity H ≤ the room humidity set value - △H, the following steps are included:

[0027] Step 1: Only the supply fan, return fan, and finned tube heat exchanger are put into operation;

[0028] Step 2: The remaining devices are turned off, and the supply air temperature and humidity of the supply air temperature and humidity sensor are used as monitoring feedback;

[0029] Natural ventilation mode:

[0030] Only all fresh air is operated. At this time, the fresh air valve of the air duct connected to the equipment is opened, the return air valve is closed, the supply fan is turned on, and the remaining devices are turned off.

[0031] Furthermore, △T is the temperature dead zone, and △H is the humidity dead zone.

[0032] Advantages of the present invention: 1. After the return air enters from the return air inlet a, it passes through the air drying runner, pre-cooling cooler, return fan, and isenthalpic cooler, and then mixes with the return air and fresh air entering from the return air inlet b and the fresh air inlet b, which can reduce the temperature of the return air from the return air inlet a.

[0033] 2. The exhaust fan, air drying runner, waste heat recovery device, pre-cooling cooler, and fresh air inlet of the present invention are located on one side below the finned tube heat exchanger. The two parts are combined into one body. The hot air entering from the return air inlet a does not need to be cooled by an additional machine. It only needs to be drawn by the return fan to enter the air mixing and adjusting device and the isenthalpic cooler respectively, effectively saving energy.

[0034] 3. The return air temperature and humidity sensor, temperature and humidity sensor after the drying runner, supply air temperature and humidity sensor, fresh air temperature and humidity sensor, temperature sensor after waste heat recovery, temperature sensor after pre-cooling, and temperature sensor after isenthalpic cooling are respectively set in the system to monitor the temperature and humidity of the return air inlet, exhaust port, supply air port, etc. in real time. According to the return air temperature, room temperature set value, return air humidity, and room humidity set value, etc., the corresponding working modes are realized, which can achieve the energy saving and high efficiency of the system, and the working modes implemented according to the corresponding temperature and humidity can effectively improve the air treatment efficiency. Description of the drawings

[0035] Figure 1 is the structural schematic diagram of the present invention;

[0036] Figure 2 is the air treatment path diagram of the present invention;

[0037] Figure 3 is the air treatment state position diagram of the present invention;

[0038] Figure 4 This is a schematic structural diagram of the sensor layout for the present invention;

[0039] Figure 5 This is the air handling psychrometric chart of the present invention;

[0040] Figure 6 This is the flowchart of the control method of the present invention.

[0041] Among them: 1. Exhaust air outlet, 2. Mixed air regulating device, 3. Supply fan, 4. Supply air outlet, 5. Fresh air inlet, 6. Waste heat recovery device, 7. Air drying runner, 8. Exhaust fan, 9. Outlet for humid air, 10. Return air inlet a, 11. Return air fan, 12. Isoenthalpic cooling device, 13. Control box, 14. Return air inlet b, 15. Air filter, 16. Tube-and-fin heat exchanger, 17. Fresh air inlet b, 18. Pre-cooling device;

[0042] TH, return air temperature and humidity sensor; TH1, temperature and humidity sensor after the drying runner; TH2, supply air temperature and humidity sensor; TH3, fresh air temperature and humidity sensor; T1, temperature sensor after waste heat recovery; T2, temperature sensor after pre-cooling; T3, temperature sensor after isoenthalpic cooling. Specific embodiments

[0043] To deepen the understanding of the present invention, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. This embodiment is only used to explain the present invention and does not limit the protection scope of the present invention.

[0044] As Figure 1-2 shown, a refrigerant-free air temperature and humidity regulation system includes a tube-and-fin heat exchanger 16. One side of the tube-and-fin heat exchanger 16 is the return air inlet b 14 and the fresh air inlet b 17, and the fresh air inlet b 17 is located below the return air inlet b 14. The other side is connected to a supply air outlet 4 through a supply fan 3. Below the tube-and-fin heat exchanger 16 are a control box 13, an isoenthalpic cooling device 12, a pre-cooling device 18, a waste heat recovery device 6, and an air drying runner 7. The isoenthalpic cooling device 12 is located below the tube-and-fin heat exchanger 16. Above one side of the isoenthalpic cooling device 12 is a mixed air regulating device 2 located at the bottom of the tube-and-fin heat exchanger 16. The waste heat recovery device 6 is located above the pre-cooling device 18, and the air drying runner 7 is located on one side of the waste heat recovery device 6. The air drying runner 7 can dehumidify the incoming air.

[0045] The upper part of the tube-and-fin heat exchanger 16 is provided with an exhaust air outlet 1 for exhausting air. On the side of the tube-and-fin heat exchanger 16 close to the return air inlet b 14, there is an air filter 15, and the air filter 15 can filter the incoming air.

[0046] An exhaust fan 8 is provided on one side of the air drying runner. A wet air discharge outlet 9 is provided outside the exhaust fan 8. The wet air discharge outlet 9, the exhaust fan 8, the air drying runner 7, the waste heat recovery device 6, and the fresh air inlet 5 are in a straight line. The exhaust fan 8 helps with exhaust air.

[0047] A return air fan 11 is provided at a position on one side of the precooling cooler 18 close to the isenthalpic cooler 12. A return air inlet a10 is provided on the other side of the precooling cooler 18. The return air inlet a10, the air drying runner 7, the return air fan 11, and the precooling cooler 18 are in a straight line.

[0048] Return air temperature and humidity sensors TH are provided at the return air inlet a10 and the return air inlet b14. A temperature and humidity sensor TH1 is provided between the lower part of the air drying runner 7 and the precooling cooler 18. A supply air temperature and humidity sensor TH2 is provided at the supply air outlet 4. A fresh air temperature and humidity sensor TH3 is provided at the fresh air inlet 2. A temperature sensor T2 after precooling is provided at the return air fan. A temperature sensor T3 after isenthalpic cooling is provided on one side of the isenthalpic cooler 12. A temperature sensor T1 after waste heat recovery is provided between the upper part of the air drying runner 7 and the waste heat recovery device 6.

[0049] The return air temperature and humidity sensor TH, the temperature and humidity sensor TH1, the supply air temperature and humidity sensor TH2, the fresh air temperature and humidity sensor TH3, the temperature sensor T1 after waste heat recovery, the temperature sensor T2 after precooling, and the temperature sensor T3 after isenthalpic cooling are respectively connected to the controller CPP1.

[0050] Working principle: The return air from the room is divided into two paths and enters the device. One part of the return air enters the device from the return air inlet a10, passes through the air drying runner 7, and is dehumidified under the action of the air drying runner 7. The dried air after dehumidification enters the precooling cooler 18 for cooling. The cooled dried air is partly drawn by the return air fan 11 into the isenthalpic cooler 12 for further cooling, and the other part is controlled by the air mixing regulating device 2 to enter the mixing section before the supply air fan 8.

[0051] The other part of the return air and the fresh air enter and mix from the return air inlet b14 and the fresh air inlet b17 respectively, pass through the air filter 15 for dust removal, enter the finned tube heat exchanger 16, exchange heat with the deep cold air after the isenthalpic cooler 12, the cooled fresh return air is mixed with the low humidity air coming from the air mixing regulating device 2, and then is sent into the room by the supply air fan 3. The air flowing vertically in the finned tube heat exchanger 16 is discharged to the outside after being heated up, and this cycle repeats.

[0052] As shown in FIGS. 3 - 5, during the process of air treatment, there are three air treatment airflows in this device simultaneously:

[0053] 1. The air flow is directly mixed and processed by the return air and fresh air in the room. Part of the return air A and fresh air B enter from the return air inlet b14 and fresh air inlet b17 respectively, pass through the air filter 15 and the tube fin heat exchanger 16, are mixed and cooled and dehumidified to C, and part of the air in state E is mixed with C by the mixing air regulating device 2 controlled by the relative humidity of the room to form state G, and then sent into the room.

[0054] 2. The low-temperature air flow that exchanges heat with the mixed air flow of return air and fresh air. Part of the return air A enters from the return air inlet a10, then is heated and dehumidified to state D by the waste heat recovery device 6, cooled to state E by the precooling cooler 18, and then passes through the isenthalpic cooler 12, further cooled to state H, and then exchanges heat in the tube fin heat exchanger 16.

[0055] 3. The medium-temperature air flow for dry heat exchange. The fresh air B is heated to state X by the waste heat recovery device 6 (waste heat hot water or waste heat steam at a temperature of fifty or sixty degrees), passes through the desiccant wheel, is cooled and humidified to reach state Z and then discharged.

[0056] As Figure 6 shown, the working modes of the various sensors arranged in this system are as follows:

[0057] CPP1 collects the temperature and humidity of the fresh air and intelligently judges the working mode. When the value of the fresh air temperature and humidity sensor TH3 > the set value of the room temperature and humidity, the device enables the cooling and dehumidification mode;

[0058] When the value of the fresh air temperature and humidity TH3 ≤ the set value of the room temperature and humidity, the device enables the natural ventilation mode;

[0059] Cooling and dehumidification working mode:

[0060] (1) When the return air temperature T > the set value of the room temperature + △T (temperature dead zone) and the return air humidity H > the set value of the room humidity + △H (humidity dead zone), the mixing air regulating device 2, the supply fan 3, the waste heat recovery device 6, the air desiccant wheel 7, the exhaust fan 8, the return air fan 11, the isenthalpic cooler 12, the tube fin heat exchanger 16 and the precooling cooler 18 are put into operation. The waste heat recovery device 6 operates at maximum (raising the T1 temperature value to the highest), the precooling cooler 18 operates at maximum (lowering the T2 temperature value to the lowest), the return air fan 11 and the exhaust fan 8 are started. If there is a fault, an alarm is given. The isenthalpic cooler 12 operates according to the difference between the return air temperature T and the set value of the room temperature by PID, and the difference between the return air humidity H and the set value of the room humidity controls the mixing air regulating device 2 by PID, and the supply air temperature and humidity TH2 are used as monitoring feedback.

[0061] When the return air temperature T > the room temperature set value + △T (temperature dead zone) and the return air humidity H ≤ the room humidity set value - △H (humidity dead zone), the mixing air regulating device 2, the supply fan 3, the waste heat recovery device 6, the air drying runner 7, the exhaust fan 8, the return air fan 11, the isenthalpic cooling device 12, the finned tube heat exchanger 16 and the precooling device 18 are put into operation. The waste heat recovery device 6 operates at maximum (raising the T1 temperature value to the highest), the precooling device 18 operates at maximum (lowering the T2 temperature value to the lowest), the return air fan 11 and the exhaust fan 8 are started, and an alarm is given if there is a fault. The isenthalpic cooling device 12 operates in PID mode according to the difference between the return air temperature T and the room temperature set value; the mixing air regulating device 2 is closed, and the supply air temperature and humidity TH2 are used as monitoring feedback.

[0062] When the return air temperature T ≤ the room temperature set value - △T (temperature dead zone) and the return air humidity H > the room humidity set value + △H (humidity dead zone), the mixing air regulating device 2, the supply fan 3, the waste heat recovery device 6, the air drying runner 7, the exhaust fan 8, the return air fan 11, the isenthalpic cooling device 12, the finned tube heat exchanger 16 and the precooling device 18 are put into operation. The waste heat recovery device 6 operates at maximum (raising the T1 temperature value to the highest), the precooling device 18 operates at maximum (lowering the T2 temperature value to the lowest), the return air fan 11 and the exhaust fan 8 are started, and an alarm is given if there is a fault. The isenthalpic cooling device is closed; the mixing air regulating device is closed, and the supply air temperature and humidity TH2 are used as monitoring feedback.

[0063] When the return air temperature T ≤ the room temperature set value - △T (temperature dead zone) and the return air humidity H ≤ the room humidity set value - △H (humidity dead zone), only the supply fan 3, the return air fan 11 and the finned tube heat exchanger 16 are put into operation, and the rest of the devices are closed. The supply air temperature and humidity TH2 are used as monitoring feedback.

[0064] Natural ventilation mode:

[0065] Only all fresh air is operated (at this time, the fresh air valve of the air duct connected to the equipment is opened and the return air valve is closed), the supply fan is turned on, and the rest of the devices are closed.

[0066] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments. Without departing from the said principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. An air temperature and humidity regulation system without refrigerant, comprising a tube-and-fin heat exchanger. One side of the tube-and-fin heat exchanger is an air return port b and a fresh air port b, and the other side is connected to an air supply port through a blower. Characterized in that: Below the tube-and-fin heat exchanger are a control box, an isenthalpic cooler, a precooling cooler, a waste heat recovery device, an air drying rotor and an air return port a. The isenthalpic cooler is located below the tube-and-fin heat exchanger. There is an exhaust port at the upper part of the tube-and-fin heat exchanger. There is an exhaust fan on one side of the air drying rotor, and there is a wet air discharge port outside the exhaust fan. Above one side of the isenthalpic cooler, there is a mixed air regulating device located at the bottom of the tube-and-fin heat exchanger. The waste heat recovery device is located above the precooling cooler, and the air drying rotor is located on one side of the waste heat recovery device; There are air return temperature and humidity sensors at the air return port a and the air return port b. There is a temperature and humidity sensor behind the drying rotor between the lower part of the air drying rotor and the precooling cooler. There is a supply air temperature and humidity sensor at the air supply port. There is a fresh air temperature and humidity sensor at the fresh air port. There is a return air fan at a position near the isenthalpic cooler on one side of the precooling cooler, and there is a temperature sensor after precooling at the return air fan. There is a temperature sensor after isenthalpic cooling on one side of the isenthalpic cooler. There is a temperature sensor after waste heat recovery between the upper part of the air drying rotor and the waste heat recovery device.

2. An air temperature and humidity regulation system without refrigerant according to claim 1, Characterized in that: There is an air filter on the side of the tube-and-fin heat exchanger close to the air return port b.

3. An air temperature and humidity regulation system without refrigerant according to claim 1, Characterized in that: There is an air return port a on the other side of the precooling cooler.

4. An air temperature and humidity regulation system without refrigerant according to claim 1, Characterized in that: The air return temperature and humidity sensor, the temperature and humidity sensor, the supply air temperature and humidity sensor, the fresh air temperature and humidity sensor, the temperature sensor after waste heat recovery, the temperature sensor after precooling and the temperature sensor after isenthalpic cooling are respectively connected to the controller CPP1.

5. An air temperature and humidity regulation system without refrigerant according to claim 1, Characterized in that: The fresh air port b is located below the air return port b.

6. A control method for an air temperature and humidity regulation system without refrigerant as claimed in claim 1, Characterized in that, An intelligent judgment working mode of an air temperature and humidity regulation system without refrigerant. When the fresh air temperature and humidity value of the fresh air temperature and humidity sensor > the room temperature and humidity set value, the device enables the cooling and dehumidification mode. When the fresh air temperature and humidity value of the fresh air temperature and humidity sensor ≤ the room temperature and humidity set value, the device enables the natural ventilation mode: Cooling and dehumidification working mode: a. When the return air temperature T > the room temperature set value + △T and the return air humidity H > the room humidity set value + △H, where △T is the temperature dead zone and △H is the humidity dead zone, the following steps are included: Step 1: The air mixing adjustment device, the air blower, the waste heat recovery device, the air drying runner, the exhaust fan, the return air fan, the enthalpy equalizing cooler, the finned tube heat exchanger, and the pre-cooling cooler are put into operation; Step 2: The waste heat recovery device operates at maximum capacity, the pre-cooling cooler operates at maximum capacity, the return air fan and the exhaust fan are started, and an alarm is given in case of a fault; Step 3: The enthalpy equalizing cooler operates according to the PID of the difference between the return air temperature T and the room temperature set value, and the PID of the difference between the return air humidity H and the room humidity set value controls the air mixing adjustment device, and the air supply temperature and humidity of the air supply temperature and humidity sensor are used as monitoring feedback; b. When the return air temperature T > the room temperature set value + △T and the return air humidity H ≤ the room humidity set value - △H, the following steps are included: Step 1: The air mixing adjustment device, the air blower, the waste heat recovery device, the air drying runner, the exhaust fan, the return air fan, the enthalpy equalizing cooler, the finned tube heat exchanger, and the pre-cooling cooler are put into operation; Step 2: The waste heat recovery device operates at maximum capacity, the pre-cooling cooler operates at maximum capacity, the return air fan and the exhaust fan are started, and an alarm is given in case of a fault; Step 3: The enthalpy equalizing cooler operates according to the PID of the difference between the return air temperature T and the room temperature set value, the air mixing adjustment device is closed, and the air supply temperature and humidity of the air supply temperature and humidity sensor are used as monitoring feedback; c. When the return air temperature T ≤ the room temperature set value - △T and the return air humidity H > the room humidity set value + △H, the following steps are included: Step 1: The air mixing adjustment device, the air blower, the waste heat recovery device, the air drying runner, the exhaust fan, the return air fan, the enthalpy equalizing cooler, the finned tube heat exchanger, and the pre-cooling cooler are put into operation; Step 2: The waste heat recovery device operates at maximum capacity, the pre-cooling cooler operates at maximum capacity, the return air fan and the exhaust fan are started, and an alarm is given in case of a fault, and the enthalpy equalizing cooler is closed; Step 3: The air mixing adjustment device is closed, and the air supply temperature and humidity of the air supply temperature and humidity sensor are used as monitoring feedback; d. When the return air temperature T ≤ the room temperature set value - △T (temperature dead zone) and the return air humidity H ≤ the room humidity set value - △H, the following steps are included: Step 1: Only the air blower, the return air fan, and the finned tube heat exchanger are put into operation; Step 2: The other devices are closed, and the air supply temperature and humidity of the air supply temperature and humidity sensor are used as monitoring feedback; Natural ventilation mode: Only all fresh air is operated. At this time, the fresh air valve of the air duct connected to the equipment is opened, the return air valve is closed, the air blower is turned on, and the other devices are closed.

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