Energy-saving fresh air system and method suitable for desert area

Abstract

The invention relates to an energy-saving fresh air system and method suitable for a desert area, the system comprises a primary side fresh air unit, the primary side fresh air unit is used for processing outdoor fresh air, and a secondary side air inlet unit is used for preparing high-temperature cold water in a precooler of the primary side fresh air unit and taking away heat released by a condenser of a mechanical refrigeration unit; the mechanical refrigeration unit is used for cooling the fresh air and adjusting the humidity; the water circulation unit is used for providing evaporative cooling water for all the units, collecting water generated by the mechanical refrigeration unit and cooling air of all the units through water evaporation. Compared with traditional equipment, the direct evaporation cooling technology is applied, energy consumption is greatly reduced, the operation efficiency of a mechanical refrigeration unit is greatly improved, meanwhile, the water resource utilization rate is increased, three working modes are provided and can be flexibly selected according to different outdoor meteorological conditions, and the system is suitable for large-scale popularization and application. Adjustment and control of different indoor temperature and humidity environments can be achieved, and the living and production requirements of desert areas are met.

Description

Technical Field

[0001] The invention belongs to the technical field of air treatment, and in particular relates to an energy-saving fresh air system and method suitable for desert areas. Background Art

[0002] The western part of my country, the Middle East and Africa have a typical desert climate, which is hot and dry in summer or all year round, and the outdoor dust environment is harsh. Conventional air handling equipment is difficult to operate efficiently to create a healthy and comfortable indoor environment in these areas. At present, conventional air handling equipment mainly faces the following challenges: the compressor exhaust temperature is too high under the extremely high outdoor temperature in desert areas, causing the air conditioning system to be unable to operate, and the condensation temperature is too high, resulting in low system energy efficiency. At the same time, frequent sandstorms increase the difficulty of the equipment's own sand prevention and air filtration. In addition, the traditional evaporative cooling air conditioner has a single refrigeration method and cannot meet the needs of different indoor temperature and humidity environments. The lack of water resources in desert areas has limited the promotion and use of traditional evaporative cooling air conditioners to a certain extent. How to improve the comprehensive performance of air handling equipment in desert areas and meet the adaptability to different indoor temperature and humidity environments has become a technical problem that needs to be overcome urgently. Summary of the invention

[0003] In order to solve the problems existing in the above-mentioned background technology, the present invention proposes an energy-saving fresh air system and method suitable for desert areas, which allows air handling equipment to operate energy-saving and efficiently in desert areas with high temperature and dryness, severe sand and dust, and scarce water resources.

[0004] The technical solution of the present invention to solve the above problems is:

[0005] An energy-saving fresh air system suitable for desert areas, which is special in that:

[0006] It includes a primary side fresh air unit, a secondary side air intake unit, a mechanical refrigeration unit and a water circulation unit;

[0007] The primary side fresh air unit is used to process outdoor fresh air;

[0008] The secondary side air inlet unit is used to prepare high-temperature cold water in the precooler of the primary side fresh air unit to take away the heat released by the condenser of the mechanical refrigeration unit;

[0009] The mechanical refrigeration unit is used to cool the fresh air and adjust the humidity;

[0010] The water circulation unit is used to provide evaporative cooling water for each unit, collect water generated by the mechanical refrigeration unit, and cool the air of each unit through evaporation of water.

[0011] Furthermore, the secondary side air inlet unit includes a filter, a secondary side wet curtain and an axial flow fan. The filter is located at the secondary side air outlet, one end of which is connected to the external environment of the unit, and the other end is connected to the secondary side air duct, and is used to filter sand and dust in the air. The secondary side wet curtain is located in the secondary side air duct, and is supplied with water by a circulating water pump, which is used to cool the primary side surface cooler with high-temperature cold water. One end of the axial flow fan is connected to the air duct of the fresh air unit on one side, and the other end is connected to the external environment of the unit, and is used to provide power for the air flow in the secondary side air duct.

[0012] Furthermore, the above-mentioned primary-side fresh air unit includes a metal filter, a sand-proof box and a centrifugal fan. The metal filter is located at the inlet of the primary-side fresh air unit, one end of which is connected to the sand-proof box, and the other end is connected to the external environment, and is used to perform preliminary filtration of outdoor sand and dust. The sand-proof box is located between the metal filter and the centrifugal fan, and is used to filter and collect sand and dust. The centrifugal fan is connected to the sand-proof box at one end, and to the fresh air pipeline at the other end, and is used to provide power for fresh air transportation.

[0013] Furthermore, the above-mentioned primary-side fresh air unit also includes a precooler, an evaporator and an evaporative wet curtain. The precooler is located in the fresh air duct, the water inlet is connected to the secondary-side water tank, and the water outlet is connected to the circulating water pump, which is used for preliminary cooling of outdoor fresh air. The evaporator is part of the mechanical refrigeration unit, one end of which is connected to the expansion valve, and the other end is connected to the compressor, which is used to adjust the temperature and humidity of the fresh air (after precooling). There is a funnel under the evaporator for transporting condensed water formed by the cooled air to the water tank. The evaporative wet curtain is located in the fresh air duct, and the primary-side water pump supplies water to it, which is used to cool the front-end air.

[0014] Furthermore, the above-mentioned primary side fresh air unit also includes a water baffle and a medium efficiency filter. The water baffle is a thin wet curtain for filtering water droplets escaping from the front evaporating wet curtain. The medium efficiency filter is located at the front end of the air supply outlet of the fresh air system and is used for secondary deep purification of the fresh air.

[0015] Furthermore, the above-mentioned mechanical refrigeration unit includes an evaporator, a condenser, a compressor, and an expansion valve. The evaporator is located in the primary-side fresh air duct, and its two ports are respectively connected to the compressor and the expansion valve; the condenser is located in the secondary-side air duct, and its two ports are respectively connected to the compressor and the expansion valve. The evaporator, condenser, compressor, and expansion valve form a cycle through the refrigerant pipeline.

[0016] Furthermore, the water circulation unit includes a precooler, a circulating water pump, an evaporative wet curtain, a water tank and a bottom suction water pump. The precooler, the circulating water pump, the secondary evaporative wet curtain and the secondary water tank form a circulation through a water pipe, and the bottom suction water pump, the primary wet curtain and the primary water tank form a circulation through a water pipe.

[0017] Furthermore, the water circulation unit also includes a solenoid valve, a float valve and a ball valve. The solenoid valve and the float valve are installed in the water tank to control the liquid level of the water tank. The two ports of the ball valve connect the water supply pipe and the external water supply pipe to control the water supply of the fresh air system.

[0018] In addition, the present invention also proposes an operation method based on the above energy-saving fresh air system suitable for desert areas, which is special in that it includes three operation modes:

[0019] (1) Full start mode

[0020] This mode is mainly for summer working conditions, and the indoor environment has no special requirements for temperature and humidity parameters. At this time, the indoor cooling load is large, and the precooler, evaporator and wet curtain in the primary air unit are running at the same time. All the equipment and devices of the fresh air system are turned on. The outdoor fresh air first exchanges heat with the precooler, and then the evaporator performs secondary cooling on the air. Finally, the wet curtain of the primary air unit is cooled and humidified and sent to the room; the wet curtain of the secondary air intake unit first cools and humidifies the air entering from the outdoor and obtains high-temperature cold water for the primary precooler, and then exchanges heat with the condenser, and finally is discharged to the outside of the machine by the axial flow fan.

[0021] In this mode, the system can maximize the role of evaporative cooling, reduce the energy consumption ratio of the mechanical refrigeration unit, and the system has a certain energy-saving effect.

[0022] (2) Precise temperature and humidity control mode

[0023] This mode is mainly for summer and transitional seasons, and the indoor environment has specific requirements for temperature and humidity parameters. At this time, the indoor cooling load is large, the precooler and evaporator in the primary side fresh air unit are running at the same time, the bottom suction pump is turned off, and the rest of the equipment is turned on. The fresh air is first cooled by the precooler, and then the evaporator of the mechanical refrigeration unit cools and dehumidifies the air before it is sent indoors.

[0024] In this mode, the system can improve the efficiency of the mechanical refrigeration unit and save energy to a certain extent. At the same time, it can accurately control the air supply status point and indoor environmental temperature and humidity.

[0025] (3) Power saving mode

[0026] This mode is mainly for summer and transitional seasons, and the indoor environment has no special requirements for temperature and humidity parameters. At this time, the indoor cooling load is moderate, the mechanical refrigeration unit is turned off, and the precooler and wet curtain in the primary side fresh air unit are running at the same time. The fresh air is first cooled by the precooler, and then cooled and humidified by the wet curtain of the primary side fresh air unit and sent to the room.

[0027] In this mode, the system's mechanical refrigeration unit is turned off, and evaporative cooling is used entirely for air treatment, resulting in significant energy-saving effects for the system.

[0028] Advantages of the present invention:

[0029] The energy-saving fresh air system and method suitable for desert areas provided by the present invention can operate continuously in extremely high temperature and dusty outdoor environments. The application of direct evaporative cooling technology greatly reduces energy consumption compared with traditional equipment, greatly improves the operating efficiency of the mechanical refrigeration unit, and improves water resource utilization. It has three working modes that can be flexibly selected according to different outdoor meteorological conditions, thereby realizing the regulation of different indoor temperature and humidity environments and meeting the needs of life and production in desert areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the energy-saving fresh air system suitable for desert areas proposed by the present invention;

[0031] Figure 2 This is a schematic diagram of the operation of the energy-saving fresh air system suitable for desert areas proposed by the present invention when it is in full working mode.

[0032] In the figure:

[0033] Secondary side air intake unit 100,

[0034] Left filter 101-1, right filter 101-2, left wet curtain 102-1, right wet curtain 102-2, axial flow fan 103, left air inlet 104, right air inlet 105, exhaust port 106;

[0035] Mechanical refrigeration unit 200,

[0036] Left condenser 201 - 1 , right condenser 201 - 2 , expansion valve 202 , compressor 203 , evaporator 204 ;

[0037] Primary side fresh air unit 300,

[0038] Metal filter 301, anti-sand box 302, centrifugal fan 303, precooler 304, primary side wet curtain 305, water baffle 306, filter 307, air outlet 308, fresh air outlet 309;

[0039] Water circulation unit 400,

[0040] The first solenoid valve 401 - 1 , the second solenoid valve 401 - 2 , the first float valve 402 - 1 , the second float valve 402 - 2 , the bottom suction pump 403 , the circulation pump 404 , the ball valve 405 , the water tank 406 , the lower water tank 407 , and the funnel 408 . DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0042] Figure 1 The energy-saving fresh air system proposed by the present invention is suitable for desert areas. The system includes a secondary side air intake unit 100, a mechanical refrigeration unit 200, a primary side fresh air unit 300, and a water circulation unit 400.

[0043] Specifically, refer to Figure 1 The secondary side unit 100 includes a filter, a secondary side wet curtain, an axial flow fan 103, a left air inlet 104, a right air inlet 105 and an exhaust port 106. The filter is composed of a left filter 101-1 and a right filter 101-2; the secondary side wet curtain is composed of a left wet curtain 102-1 and a right wet curtain 102-2. The secondary side air enters through the left air inlet 104 and the right air inlet 105, and the left filter 101-1 and the right filter 101-2 are respectively distributed at the entrances of the left air inlet 104 and the right air inlet 105.

[0044] The mechanical refrigeration unit 200 includes a condenser, an expansion valve 202, a compressor 203 and an evaporator 204. The condenser 200 includes a left condenser 201-1 and a right condenser 201-2, both of which are installed behind the secondary side wet curtain to discharge the waste heat generated by the mechanical refrigeration unit. The main purpose is to reduce the system condensation temperature, ensure its normal operation, and improve the efficiency of the mechanical refrigeration unit.

[0045] Among them, the secondary side air passes through the filters on both sides, is cooled and humidified by the wet curtain, and then passes through the left condenser 201-1 and the right condenser 201-2 in the mechanical refrigeration unit 200. After the air exchanges heat with the condenser, it is discharged to the external environment through the axial flow fan. This process can reduce the condensation temperature of the condenser and improve the energy efficiency of the mechanical refrigeration unit.

[0046] In addition, the evaporator 204 is installed in the primary-side fresh air unit 300, and its purpose is to absorb the heat of the primary-side fresh air to achieve a cooling effect.

[0047] It is worth noting that when the primary-side fresh air unit 300 is working, the mechanical refrigeration unit 200 may not be working, so this operation mode saves energy consumption.

[0048] The primary side fresh air unit 300 includes a metal filter 301, a sandproof box 302, a centrifugal fan 303, a precooler 304, a primary side wet curtain 305, a water baffle 306, a filter 307, an air supply port 308 and a fresh air port 309. The air of the primary side fresh air unit 300 is sucked in by the centrifugal fan 303 and enters the interior of the fresh air duct through the metal filter 301 and the sandproof box 302.

[0049] In addition, the primary side wet curtain 305 is supplied with water from the lower water tank 407 below the primary side fresh air unit 300 by the water pump 403 to achieve the effect of cooling and humidifying the incoming air. A water blocking plate 306 is installed in the fresh air duct to block water droplets in the discharged air, prevent water from accumulating on the exhaust port 308 and water from being directly sent in by liquid, which may affect the normal operation of the system.

[0050] The water circulation unit 400 includes a solenoid valve, a float valve, a bottom suction pump 403, a circulation pump 404, and a ball valve 405. The water in the precooler is supplied to the secondary side wet curtains 102-1 and 102-2 through the circulation pump 404 to cool the secondary side air intake, and the water inside the wet curtains returns to the precooler 304 through the upper water tank 406 at the lower part of the secondary side air intake unit 400.

[0051] In addition, the building water supply network can supply water to the upper water tank 406 below the secondary side air intake unit 100 and the lower water tank 407 below the primary side fresh air unit 300 through the control of the ball valve 405. The first float valve 402-1 and the second float valve 402-2 are respectively connected to the first solenoid valve 401-1 and the second solenoid valve 401-2 to control the water level.

[0052] In the present invention, the present invention also proposes an operation method based on the above energy-saving fresh air system suitable for desert areas, including three modes:

[0053] The precooler 304 and the primary side wet curtain 305 work, the precooler 304 and the evaporator 204 work, and the primary side wet curtain 305 and the evaporator 204 and the precooler 304 work. The three working modes have different efficiencies, applicable working conditions, and refrigeration effects, and their energy consumption is also different.

[0054] Specifically, when the precooler 304 and the primary side wet curtain 305 are working, the fresh air will first exchange heat with the precooler 304. After the fresh air is cooled down, it will pass through the primary side wet curtain 305 for cooling and humidification, and then pass through the water baffle 306 and the medium efficiency filter 307 before entering the room. This working condition is mainly suitable for situations where the outdoor air is dry and the temperature is relatively high.

[0055] When the precooler 304 and the evaporator 204 are working, the fresh air first passes through the precooler 304 to cool down, then passes through the evaporator 204 for heat exchange, so that the temperature of the fresh air is lowered, and finally sent into the room. This working condition is mainly suitable for the situation of high temperature outdoors.

[0056] When the primary side wet curtain 305, evaporator 204 and precooler 304 work together, the fresh air is first cooled by the precooler 304, then exchanges heat with the evaporator 204, and finally cooled and humidified by the primary side wet curtain 305 before entering the room. This working condition is mainly suitable for situations where the outdoor air is particularly dry and hot.

[0057] These three operating modes can be switched flexibly to adapt to various meteorological parameters in desert areas, as follows:

[0058] (1) Full start mode

[0059] This mode is mainly for summer working conditions, and the indoor environment has no special requirements for temperature and humidity parameters. At this time, the indoor cooling load is large, and the precooler 304, evaporator 204 and primary wet curtain 305 in the primary fresh air unit 300 are running at the same time, and all equipment and devices of the fresh air system are turned on. The outdoor fresh air first exchanges heat with the precooler 304, and then the evaporator 204 performs secondary cooling on the air, and finally the primary fresh air unit 300 and primary wet curtain 305 are cooled and humidified and sent to the room.

[0060] Specifically, refer to Figure 2 In summer, outdoor fresh air is sent into the primary side fresh air unit 300 through the centrifugal fan 303 and is cooled by the precooler, then passes through the evaporator 204 for secondary isohumidification cooling, and finally passes through the primary side wet curtain 305 for isenthalpic humidification cooling to the air supply state point.

[0061] The secondary side wet curtain of the secondary side air inlet unit 100 first cools and humidifies the air entering from the outside and obtains high-temperature cold water for the primary side precooler 304, then exchanges heat with the condenser, and finally is discharged to the outside of the machine by the axial flow fan 103.

[0062] The compressor 203 of the mechanical refrigeration unit 200 compresses the gaseous refrigerant into a high-temperature and high-pressure liquid refrigerant, and then sends it to the condenser to dissipate heat and become a normal-temperature and high-pressure liquid refrigerant, and then to the expansion valve 202 and enter the evaporator 204.

[0063] Since the space of the refrigerant suddenly increases and the pressure decreases after reaching the evaporator 204 from the expansion valve 202, the liquid refrigerant will vaporize and become a gaseous low-temperature refrigerant, thereby absorbing a large amount of heat. The gaseous low-temperature refrigerant flows back to the compressor 203 through the pipeline.

[0064] In order to prevent the accumulated water from interfering with the air supply, a water retaining plate 306 is provided to block the water droplets. In order to obtain healthy and hygienic air, a metal filter 301 and a medium-efficiency filter 307 are installed in the air duct of the primary-side fresh air unit.

[0065] The water circulation unit 400 supplies the water in the lower water tank 407 to the primary side wet curtain 305 through the bottom suction pump 403, and transports the water in the building pipe network to the upper water tank 406 and the lower water tank 407 through the ball valve 405. The solenoid valve and the float valve control the liquid level of the water tank. The secondary side wet curtain sprays water to the upper water tank 406, and the pipeline supplies water to the precooler 304 through the upper water tank 406. The water in the precooler 304 is then supplied to the secondary side wet curtain by the circulation pump 404.

[0066] In this mode, the system can maximize the role of evaporative cooling, reduce the energy consumption ratio of the mechanical refrigeration unit, and the system has a certain energy-saving effect.

[0067] (2) Precise temperature and humidity control mode

[0068] This mode is mainly for summer and transitional seasons, and the indoor environment has specific requirements for temperature and humidity parameters. At this time, the indoor cooling load is large, and the precooler 304 and evaporator 204 in the primary side fresh air unit 300 are running at the same time, the bottom suction pump 403 is turned off, and the rest of the equipment is turned on. The fresh air is first cooled by the precooler 304, and then the air is cooled and dehumidified by the evaporator of the mechanical refrigeration unit 200 before being sent indoors.

[0069] Specifically, refer to Figure 2 In summer and transition seasons, outdoor fresh air is sent into the primary side fresh air unit 300 through the centrifugal fan 303 and is cooled by the precooler for isohumidification, and then passes through the evaporator 204 for secondary cooling and dehumidification to the air supply state point.

[0070] The secondary side wet curtain of the secondary side air inlet unit 100 first cools and humidifies the air entering from the outside and obtains high-temperature cold water for the primary side precooler 304, then exchanges heat with the condenser, and finally is discharged to the outside of the machine by the axial flow fan 103.

[0071] The compressor 203 of the mechanical refrigeration unit 200 compresses the gaseous refrigerant into a high-temperature and high-pressure liquid refrigerant, and then sends it to the condenser to dissipate heat and become a normal-temperature and high-pressure liquid refrigerant, and then to the expansion valve 202 and enter the evaporator 204.

[0072] Since the space of the refrigerant suddenly increases and the pressure decreases after reaching the evaporator 204 from the expansion valve 202, the liquid refrigerant will vaporize and become a gaseous low-temperature refrigerant, thereby absorbing a large amount of heat. The gaseous low-temperature refrigerant flows back to the compressor 203 through the pipeline.

[0073] The water generated by the condensed air in the evaporator 204 is poured into the lower water tank 407 through the funnel 408. The water circulation unit 400 transports the water in the building pipe network to the upper water tank 406 and the lower water tank 407 through the ball valve 405. The solenoid valve and the float valve control the liquid level of the water tank. The secondary side wet curtain pours water into the upper water tank 406, and the pipeline supplies water to the precooler 304 through the upper water tank 406. The water in the precooler 304 is then supplied to the secondary side wet curtain by the circulation pump 404.

[0074] In this mode, the system can improve the efficiency of the mechanical refrigeration unit and save energy to a certain extent. At the same time, it can accurately control the air supply status point and indoor environmental temperature and humidity.

[0075] (3) Power saving mode

[0076] This mode is mainly for summer and transitional seasons, and the indoor environment has no special requirements for temperature and humidity parameters. At this time, the indoor cooling load is moderate, the mechanical refrigeration unit 200 is turned off, and the precooler 304 and the primary wet curtain 305 in the primary fresh air unit are running at the same time. The fresh air is first cooled by the precooler 304, and then cooled and humidified by the primary fresh air unit 300 and the primary wet curtain 305 and sent to the room.

[0077] Specifically, refer to Figure 2 In summer and transitional seasons, outdoor fresh air is sent into the primary side fresh air unit 300 through the centrifugal fan 303 and is cooled by the precooler for isohumidification, and then passes through the primary side wet curtain 305 for isenthalpic humidification and cooling to the air supply state point.

[0078] The secondary side wet curtain of the secondary side air inlet unit 100 first cools and humidifies the air entering from the outside and obtains high temperature cold water for the primary side precooler 304, which is finally discharged to the outside of the machine by the axial flow fan 103.

[0079] The water circulation unit 400 supplies the water in the lower water tank 407 to the primary side wet curtain 305 through the bottom suction pump 403, and transports the water in the building pipe network to the upper water tank 406 and the lower water tank 407 through the ball valve 405. The solenoid valve and the float valve control the liquid level of the water tank. The secondary side wet curtain sprays water to the upper water tank 406, and the pipeline supplies water to the precooler 304 through the upper water tank 406. The water in the precooler 304 is then supplied to the secondary side wet curtain by the circulation pump 404.

[0080] In this mode, the system's mechanical refrigeration unit is turned off, and evaporative cooling is used entirely for air treatment, resulting in significant energy-saving effects for the system.

[0081] In summary, the above-mentioned energy-saving fresh air system suitable for desert areas can operate continuously in extremely high temperature and dusty outdoor environments. The application of direct evaporative cooling technology greatly reduces energy consumption compared with traditional equipment, and the operating efficiency of the mechanical refrigeration unit is greatly improved. At the same time, the utilization rate of water resources is improved. It has three working modes that can be flexibly selected according to different outdoor meteorological conditions, and can realize the regulation of different indoor temperature and humidity environments to meet the needs of life and production in desert areas.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can still adjust the technical solutions described in the above embodiments or replace some of the technical features by equivalents. Therefore, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. An energy-saving fresh air system suitable for desert areas, characterized by: It comprises a secondary side air intake unit (100), a mechanical refrigeration unit (200), a primary side fresh air processing unit (300) and a water circulation unit (400); The secondary side air intake unit (100) is used to cool down the cooling equipment on the primary side; the mechanical refrigeration unit (200) is used to adjust the temperature of the primary side fresh air; The primary side fresh air processing unit (300) is used to adjust the temperature and filter the fresh air; The water circulation unit (400) is used to provide evaporative cooling water required by the secondary side air intake unit (100) and the primary side fresh air unit (300), and collect water generated by the mechanical refrigeration unit (200) for internal circulation supply.

2. The energy-saving fresh air system suitable for desert areas as claimed in claim 1, characterized in that: The secondary side air inlet unit (100) comprises a filter, a secondary side wet curtain, an axial flow fan (103), a left side air inlet (104), a right side air inlet (105) and an air outlet (106); the secondary side wet curtain comprises a left wet curtain (102-1) and a right wet curtain (102-2); the left wet curtain (102-1) and the right wet curtain (102-2) are connected in parallel by a water pipe.

3. The energy-saving fresh air system suitable for desert areas as claimed in claim 2, characterized in that: The mechanical refrigeration unit (200) comprises a left condenser (201-1), a right condenser (201-2), an expansion valve (202), a compressor (203) and an evaporator (204); the left condenser (201-1) and the right condenser (201-2) are connected in parallel with a copper tube to form a condensing unit; one end of the condensing unit is connected to the compressor (203) with a copper tube; the other end of the compressor (203) is connected to the evaporator (204) with a copper tube; and the expansion valve (202) is arranged on a pipeline between the condensing unit and the evaporator (204).

4. The energy-saving fresh air system suitable for desert areas as claimed in claim 3, characterized in that: The primary side fresh air unit (300) comprises a metal filter (301), a sandproof box (302), a centrifugal fan (303), a precooler (304), a primary side wet curtain (305), a water baffle (306), a medium efficiency filter (307), an air supply port (308) and a fresh air port (309); The metal filter (301) and the anti-sand box (302) filter outdoor fresh air, the precooler (304) is connected to the water pipe between the left wet curtain (102-1) and the right wet curtain (102-2), and the primary side wet curtain (305) is located downstream of the evaporator (204) and is connected to the water circulation unit (400) through a water pipe.

5. The energy-saving fresh air system suitable for desert areas as claimed in claim 4, characterized in that: The lower ends of the secondary side wet curtain and the condensation unit are upper water tanks (406), and the lower ends of the primary side wet curtain (305) and the evaporator (204) are lower water tanks (407). The secondary side wet curtain and the primary side wet curtain (305) spray water to the upper water tank (406) and the lower water tank (407) below, and the water generated by the condensed air of the evaporator (204) is sprayed to the lower water tank (407) through the funnel (408).

6. The energy-saving fresh air system suitable for desert areas as claimed in claim 5, characterized in that: The water circulation unit (400) comprises a solenoid valve, a float valve, a bottom suction pump (403), a circulation pump (404) and a ball valve (405); the solenoid valve and the float valve control the liquid level heights of the upper water tank (406) and the lower water tank (407); the ball valve (405) controls external water inlet; and the circulation pump (404) is located on the water pipe connecting the secondary side wet curtain and the precooler (304).

7. The energy-saving fresh air system suitable for desert areas as claimed in claim 6, characterized in that: The solenoid valve comprises a first solenoid valve (401-1) and a second solenoid valve (401-2), and the float valve comprises a first float valve (402-1) and a second float valve (402-2); The first electromagnetic valve (401-1) and the first floating ball valve (402-1) are located in the upper water tank (406), the second electromagnetic valve (401-2) and the second floating ball valve (402-2) are located in the lower water tank (407), and the ball valve (405) is connected to the electromagnetic valve and the floating ball valve by a water pipe.

8. The energy-saving fresh air system suitable for desert areas as claimed in claim 7, characterized in that: The water pump (403) is connected to the primary side wet curtain (305) through a water pipe, and pumps water from the lower water tank (407) to the primary side wet curtain (305).

9. The energy-saving fresh air system suitable for desert areas as claimed in claim 8, characterized in that: The circulating water pump (404) is located on a water pipe connecting the precooler (304) and the secondary wet curtain. An open loop is formed between the circulating water pump (404), the precooler (304), the secondary wet curtain and the upper water tank (406). Water in the upper water tank (406) passes through the precooler (304), the circulating water pump (404) and the secondary wet curtain in sequence, and finally flows back to the upper water tank (406) through the secondary wet curtain. The precooler (304) is connected to the lower water tank (407) by a pipeline so that the precooler (304) has sufficient water to supply the secondary side wet curtain.

10. An operating method of the energy-saving fresh air system suitable for desert areas based on claim 9, which is special in that it includes three modes: (1) Full start mode This mode is mainly aimed at summer working conditions. The precooler (304), evaporator (204) and primary wet curtain (305) in the primary fresh air unit (300) are operated simultaneously, and all equipment and devices of the fresh air system are turned on. The outdoor fresh air first exchanges heat with the precooler (304), and then the air is subjected to secondary cooling by the evaporator (204). Finally, the primary wet curtain (305) of the primary fresh air unit (300) is cooled and humidified and sent to the room. The secondary wet curtain of the secondary air inlet unit (100) first cools and humidifies the air entering from the outdoor and obtains high-temperature cold water for the primary precooler (304), and then exchanges heat with the condenser. Finally, the axial flow fan (103) discharges the air to the outside of the machine. (2) Precise temperature and humidity control mode This mode is mainly for summer and transitional season conditions. The precooler (304) and evaporator (204) in the primary side fresh air unit (300) are operated simultaneously, the bottom suction pump (403) is turned off, and the other equipment devices are turned on. The fresh air is first cooled by the precooler (304), and then the air is cooled and dehumidified by the evaporator of the mechanical refrigeration unit (200) before being sent into the room. (3) Power saving mode This mode is mainly aimed at summer and transitional season conditions. The mechanical refrigeration unit (200) is turned off, and the precooler (304) and the primary wet curtain (305) in the primary fresh air unit are operated simultaneously. The fresh air is first cooled by the precooler (304), and then cooled and humidified by the primary wet curtain (305) of the primary fresh air unit (300) and sent into the room.

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