Airplane ground air conditioning unit based on cold carrier circulation and control method thereof

Abstract

The application discloses an aircraft ground air conditioning unit based on a cold carrier circulation and a control method thereof. The aircraft ground air conditioning unit is provided with a cold carrier circulation cooling mechanism and a three-stage refrigeration mechanism in a cooperative working mode. The cold carrier circulation assembly can precool the cold carrier by using the condensed water recovered by the spraying assembly, reduce the load demand of the compressor in the three-stage refrigeration mechanism, avoid the high energy consumption problem of the long-term full-load operation of the compressor in the three-stage refrigeration mechanism, and reduce the electricity cost proportion in the whole life cycle of the unit. The spraying assembly can spray the condensed water collected by the water receiving disc to the cold carrier circulation assembly, can strengthen the heat dissipation efficiency of the cold carrier in a high-temperature environment, cooperate with the step-by-step temperature reduction design of the three-stage refrigeration mechanism, ensure that efficient refrigeration can be maintained during a high-temperature period, and reduce the full-load operation time of the compressor. Moreover, the condensed water collected by the water receiving disc is directly supplied to the spraying assembly as a cooling medium, the consumption of external cooling water is reduced, and an energy-saving closed loop of condensed water recovery, spraying cooling and refrigeration efficiency improvement is formed.

Description

Technical Field

[0001] This invention relates to the field of ground air conditioning unit technology, and in particular to an aircraft ground air conditioning unit based on a cooling cycle and its control method. Background Technology

[0002] Within the scope of aviation ground support, aircraft rely on ground air conditioning units to provide clean air with stable flow, precise temperature and humidity, and compliant pressure during parking. The temperature range of this clean air is typically 18-25℃, and the humidity is generally 40%-60%. Ground air conditioning units operate under heavy loads and for extended periods, making them a core component of airport energy consumption. Current mainstream aircraft ground air conditioning units face the following technical challenges: 1. Existing aircraft ground air conditioning units generally rely on single-compressor refrigeration systems to achieve cooling. The compressors operate at full load for extended periods, resulting in a high proportion of their energy consumption in the total energy consumption of airport ground support equipment. Furthermore, their operating electricity costs account for a significantly high proportion of the unit's total life-cycle cost. This indicates a problem of high energy consumption and operating costs, which contradicts the requirements for energy conservation and emission reduction.

[0003] 2. Some ground air conditioning units are equipped with natural cooling systems that can only rely on ambient air for heat exchange. When the ambient temperature in summer reaches the common high temperature threshold during the peak airport operation period, the temperature difference between the ambient air and the cabin is too small, resulting in a sharp drop in natural cooling efficiency. The compressor still needs to operate at full load, which cannot meet the energy-saving requirements under high temperature conditions.

[0004] 3. Traditional ground air conditioning units use start-stop control logic. Frequent compressor start-stop causes large fluctuations in outlet air temperature, which can easily lead to sudden changes in cabin temperature and humidity, adversely affecting passenger comfort and the stability of onboard equipment.

[0005] It is evident that existing technologies still need improvement and enhancement. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide an aircraft ground air conditioning unit based on a cooling cycle. By setting the cooling cycle cooling mechanism and the three-stage refrigeration mechanism to work together, the load on the compressor of the three-stage refrigeration mechanism can be reduced, avoiding the high energy consumption problem of long-term full-load operation, and reducing the proportion of electricity cost in the whole life cycle of the unit.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: An aircraft ground air conditioning unit based on a cooling cycle includes a control device, an air conditioning housing, and a cooling cycle mechanism, a three-stage refrigeration mechanism, and a water collection tray disposed within the air conditioning housing. The water collection tray is located at the bottom of the air conditioning housing and is used to collect condensate from the cooling cycle mechanism and the three-stage refrigeration mechanism. The cooling cycle mechanism includes an air handling surface cooler, a cooling cycle assembly, and a spray assembly. The input end of the spray assembly is connected to the water collection tray, and the output end of the spray assembly is used to provide cooling spray water to the cooling cycle assembly. The cooling cycle assembly is connected to the air handling surface cooler and is used to supply cooling capacity to the air handling surface cooler. The air handling surface cooler and the three-stage refrigeration mechanism are arranged sequentially along the airflow direction. The cooling cycle assembly, the spray assembly, and the three-stage refrigeration mechanism are all electrically connected to the control device.

[0008] In the aircraft ground air conditioning unit based on the cooling cycle, the air conditioning unit is further provided with a fresh air handling mechanism electrically connected to the control device. The fresh air handling mechanism is located on the input side of the air handling surface cooler. The fresh air handling mechanism includes an air filter, a silencer, and a high-pressure blower arranged sequentially along the air flow direction. The high-pressure blower is equipped with a blower frequency converter, which is electrically connected to the control device.

[0009] In the aircraft ground air conditioning unit based on the cooling cycle, the three-stage refrigeration mechanism includes a primary refrigeration unit, a secondary refrigeration unit, a tertiary refrigeration unit, and an electric heating unit, which are electrically connected to the control device. The primary refrigeration unit includes a primary evaporator, the secondary refrigeration unit includes a secondary evaporator, and the tertiary refrigeration unit includes a tertiary evaporator. The air handling surface cooler, the primary evaporator, the secondary evaporator, the tertiary evaporator, and the electric heating unit are arranged sequentially along the airflow direction.

[0010] In the aforementioned aircraft ground air conditioning unit based on a refrigerant cycle, the primary refrigeration unit, secondary refrigeration unit, and tertiary refrigeration unit have identical structures. The primary refrigeration unit further includes a first check valve, an exhaust pressure protector, a condenser, a liquid receiver, a dryer filter, an expansion valve, a gas-liquid separator, an intake pressure protector, a second check valve, and a compressor electrically connected to the control device. The output end of the compressor, the first check valve, the exhaust pressure protector, the condenser, the liquid receiver, the dryer filter, the expansion valve, the primary evaporator, the gas-liquid separator, the intake pressure protector, the second check valve, and the input end of the compressor are connected sequentially along the refrigerant flow direction.

[0011] In the aforementioned aircraft ground air conditioning unit based on a refrigerant cooling cycle, the refrigerant cooling cycle assembly includes an ambient cooling surface cooler, a first check valve, an expansion tank, a first filter, and a charging valve, a venting valve, an electric drain valve, a first flow switch, and a fluid pump, all electrically connected to the control device. The output end of the ambient cooling surface cooler, the venting valve, the charging valve, the first check valve, the first filter, the fluid pump, the expansion tank, the air handling surface cooler, the first flow switch, and the input end of the ambient cooling surface cooler are arranged sequentially along the refrigerant flow direction. The electric drain valve is located at the output end of the drip tray and is used to drain excess condensate collected in the drip tray.

[0012] In the aircraft ground air conditioning unit based on the cooling cycle, the spray assembly includes a second filter, a second check valve, and a spray unit and a flow protector that are electrically connected to the control device respectively; the water receiving tray, the second filter, the second check valve, the flow protector, and the input end of the spray unit are arranged sequentially along the water flow direction; the spray unit is used to spray water evenly onto the surface of the ambient cooling surface cooler.

[0013] The aircraft ground air conditioning unit based on the cooling cycle further includes a first temperature sensor for acquiring ambient temperature, a second temperature sensor for acquiring the air outlet temperature of the air conditioning unit, a first pressure sensor for acquiring the air outlet pressure of the air conditioning unit, a second pressure sensor for acquiring the compressor discharge pressure, and a humidity sensor for acquiring ambient humidity. A liquid level sensor is installed in the water receiving tray. The first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the humidity sensor, and the liquid level sensor are all electrically connected to the control device.

[0014] The present invention also provides a control method for an aircraft ground air conditioning unit based on a cooling cycle. The control method is used to implement the operation control of the aircraft ground air conditioning unit as described above. An electric drain valve is provided at the output end of the water receiving tray. The control method includes: acquiring a preset ambient temperature threshold range, a preset outlet air temperature threshold range, a preset drain temperature threshold range, and a preset drain level threshold range; acquiring the real-time ambient temperature fed back by a first temperature sensor, the real-time outlet air temperature fed back by a second temperature sensor, and the real-time water level fed back by a level sensor; controlling the spray assembly to start or stop supplying spray water based on the comparison results of the real-time ambient temperature and the preset ambient temperature threshold range, and the comparison results of the real-time water level and the preset drain level threshold range; and when the spray assembly starts supplying spray water, adjusting the operating state of the cooling cycle assembly based on the comparison results of the real-time outlet air temperature and the preset outlet air temperature threshold range; and adjusting the operating state of the electric drain valve based on the comparison results of the real-time ambient temperature and the preset drain temperature threshold range.

[0015] In the control method described above, the cooling circulation assembly includes a fluid pump and an ambient cooling surface cooler, the ambient cooling surface cooler supplying refrigerant to the air handling surface cooler via the fluid pump; the spray unit includes a spray water pump, the spray water pump being used to supply spray water for cooling the ambient cooling surface cooler; the spray assembly is controlled to start or stop supplying spray water based on a comparison between the real-time ambient temperature and a preset ambient temperature threshold range, and a comparison between the real-time water level and a preset drainage level threshold range, and when the spray assembly starts supplying spray water, the operating state of the cooling circulation assembly is adjusted based on a comparison between the real-time outlet air temperature and a preset outlet air temperature threshold range, including: when the preset lower limit of the ambient temperature is ≤ the real-time ambient temperature threshold range... When the ambient temperature is less than or equal to the preset upper limit of ambient temperature and the real-time water level is greater than or equal to the preset upper limit of drainage level, the spray pump is controlled to maintain its original operation. When the preset lower limit of ambient temperature is less than the real-time ambient temperature, or the real-time water level is less than the preset lower limit of drainage level, the spray pump is controlled to shut down. When the real-time ambient temperature is greater than the preset upper limit of ambient temperature and the real-time water level is greater than or equal to the preset upper limit of drainage level, the spray pump is controlled to turn on. When the preset lower limit of outlet air temperature is less than or equal to the real-time outlet air temperature and less than the preset upper limit of outlet air temperature, the fluid pump is controlled to maintain its original operation. When the real-time outlet air temperature is greater than the preset upper limit of outlet air temperature, the fluid pump is controlled to load. When the real-time outlet air temperature is less than the preset lower limit of outlet air temperature, the fluid pump is controlled to unload.

[0016] In the control method described above, adjusting the operating state of the electric drain valve based on the comparison result between the real-time ambient temperature and the preset drainage temperature threshold range includes: when the preset lower limit of the drainage temperature is less than or equal to the real-time ambient temperature and the preset upper limit of the drainage temperature, controlling the electric drain valve to maintain its original operation; when the real-time ambient temperature is greater than the preset upper limit of the drainage temperature, controlling the electric drain valve to close; and when the real-time ambient temperature is less than the preset lower limit of the drainage temperature, controlling the electric drain valve to open.

[0017] Beneficial effects: This invention provides an aircraft ground air conditioning unit based on a cooling cycle. By setting up a collaborative working mode between the cooling cycle mechanism and the three-stage refrigeration mechanism, the cooling cycle component can use the condensate recovered by the spray component to pre-cool the refrigerant, reducing the load demand of the compressor in the three-stage refrigeration mechanism and avoiding the high energy consumption problem of the compressor running at full load for a long time in the three-stage refrigeration mechanism, thus reducing the proportion of electricity costs over the entire life cycle of the unit. The spray component sprays the condensate collected in the water collection pan onto the cooling cycle component, which can enhance the heat dissipation efficiency of the refrigerant in high-temperature environments. Combined with the step-by-step cooling design of the three-stage refrigeration mechanism, it ensures that efficient cooling can still be maintained during high-temperature periods, reducing the compressor's full-load operation time. Moreover, the condensate collected in the water collection pan is directly supplied to the spray component as a cooling medium, reducing the consumption of external cooling water, forming an energy-saving closed loop of condensate recovery, spray cooling, and enhanced cooling efficiency. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of the aircraft ground air conditioning unit provided by the present invention; Figure 2 The system structure diagram of the aircraft ground air conditioning unit provided by the present invention; Figure 3 The logic flowchart of the control method provided by the present invention.

[0019] Key component symbols: 1-Control device, 2-Air conditioning unit, 31-Air handling unit, 321-Ambient cooling unit, 322-First check valve, 323-Expansion tank, 324-First filter, 325-Charging valve, 326-Vent valve, 327-Electric drain valve, 328-First flow switch, 329-Fluid pump, 331-Second filter, 332-Second check valve, 333-Spray unit, 3331-Spray pump, 334-Flow protector, 4101-First-stage evaporator, 4102-First check valve, 4103-Exhaust pressure protector. 4104-Condenser, 4105-Liquid receiver, 4106-Drier filter, 4107-Expansion valve, 4108-Gas-liquid separator, 4109-Suction pressure protector, 4110-Second check valve, 4111-Compressor, 42-Second stage refrigeration unit, 43-Third stage refrigeration unit, 44-Electric heating unit, 5-Drain tray, 61-Air filter, 62-Silencer, 63-High pressure blower, 71-First temperature sensor, 72-Second temperature sensor, 73-First pressure sensor, 74-Second pressure sensor, 75-Humidity sensor, 76-Liquid level sensor. Detailed Implementation

[0020] This invention provides an aircraft ground air conditioning unit based on a cooling cycle and its control method. To make the purpose, technical solution and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "bottom" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and should not be construed as a limitation of this invention; in addition, terms such as "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] Please see Figure 1 and Figure 2 This invention provides an aircraft ground air conditioning unit based on a cooling cycle, including a control device 1, an air conditioning housing 2, and a cooling cycle mechanism, a three-stage refrigeration mechanism, and a water collection tray 5 disposed within the air conditioning housing 2. The water collection tray 5 is disposed at the bottom of the air conditioning housing 2 and is used to collect condensate from the cooling cycle mechanism and the three-stage refrigeration mechanism. The cooling cycle mechanism includes an air handling surface cooler 31, a cooling cycle assembly, and a spray assembly. The input end of the spray assembly is connected to the water collection tray 5, and the output end of the spray assembly is used to provide cooling spray water to the cooling cycle assembly. The cooling cycle assembly is connected to the air handling surface cooler 31 and is used to supply cooling capacity to the air handling surface cooler 31. The air handling surface cooler 31 and the three-stage refrigeration mechanism are arranged sequentially along the airflow direction. The cooling cycle assembly, the spray assembly, and the three-stage refrigeration mechanism are all electrically connected to the control device 1.

[0023] This application discloses an aircraft ground air conditioning unit based on a cooling cycle. By setting up a collaborative working mode between the cooling cycle cooling mechanism and the three-stage refrigeration mechanism, the cooling cycle component can use the condensate recovered by the spray component to pre-cool the refrigerant, reducing the load demand of the compressor 4111 in the three-stage refrigeration mechanism. It can also avoid the high energy consumption problem of the compressor 4111 in the three-stage refrigeration mechanism running at full load for a long time, and reduce the proportion of electricity cost over the whole life cycle of the unit. The spray component sprays the condensate collected in the water collection pan 5 onto the cooling cycle component, which can enhance the heat dissipation efficiency of the refrigerant in high-temperature environments. Combined with the step-by-step cooling design of the three-stage refrigeration mechanism, it can ensure that efficient cooling can still be maintained during high-temperature periods, reducing the full-load operation time of the compressor 4111. Moreover, the condensate collected in the water collection pan 5 is directly supplied to the spray component as a cooling medium, reducing the consumption of external cooling water, forming an energy-saving closed loop of condensate recovery, spray cooling, and improved cooling efficiency.

[0024] In this embodiment, the water collection tray 5 completely covers the bottom of the air conditioning unit 2, ensuring the collection of condensate from all the cooling components of the refrigerant circulation system and the three-stage refrigeration system. A drain outlet is provided at the bottom of the water collection tray 5, and this outlet is connected to the inlet of the electric drain valve 327. When the air handling surface cooler 31 and the evaporator of the three-stage refrigeration system are working, water vapor in the air condenses upon contact with the cold surface, and water droplets drip along the surface of the components onto the bottom water collection tray 5, achieving centralized collection of condensate. The control device 1 starts the fluid pump 329 of the refrigerant circulation system, pressurizing and delivering the refrigerant to the air handling surface cooler 31. When fresh air from outside flows through the air handling surface cooler 31, the refrigerant... The system absorbs heat from the air, reducing the air temperature from 40-50℃ to 30-35℃, thus completing pre-cooling. Simultaneously, the spray assembly activates, pressurizing the condensate in the water collection pan 5 and spraying it onto the surface of the ambient cooling surface cooler 321. The water evaporates and absorbs heat to cool the refrigerant, forming a closed-loop heat exchange between the refrigerant, air, and spray water. The pre-cooled air enters the three-stage refrigeration mechanism. The first-stage evaporator 4101, the second-stage evaporator, and the third-stage evaporator absorb heat through refrigerant evaporation, successively reducing the air temperature to 22-25℃, 19-22℃, and 18-19℃. If the air humidity is below 40%, the electric heating unit 44 activates, indirectly increasing the outlet air humidity to the target humidity range.

[0025] Further, please refer to Figure 1 and Figure 2 The air conditioning unit 2 is also equipped with a fresh air handling mechanism that is electrically connected to the control device 1. The fresh air handling mechanism is located on the input side of the air handling surface cooler 31. The fresh air handling mechanism includes an air filter 61, a silencer 62 and a high-pressure blower 63 arranged sequentially along the air flow direction. The high-pressure blower 63 is equipped with a blower frequency converter, which is electrically connected to the control device 1.

[0026] In this embodiment, along the direction of fresh air flow, the components of the fresh air handling mechanism are, in sequence: an air filter 61, a silencer 62, and a high-pressure blower 63. Each component is connected via galvanized pipe flanges, and the inner wall of the pipe is soundproofed. The air filter 61 is a bag filter, with its inlet connected to the external fresh air duct. The silencer 62 is an impedance composite type, with its two ends connected to the outlet of the air filter 61 and the inlet of the high-pressure blower 63, respectively. The high-pressure blower 63 is a centrifugal fan, with its motor housing a blower frequency converter, which is electrically connected to the control device 1 via wires. External fresh air first enters the air filter 61, filtering out dust and impurities to prevent scaling or clogging of subsequent components, thus improving heat exchange efficiency. The filtered fresh air enters the silencer 62, where the impedance composite silencing structure reduces the aerodynamic noise generated by the high-pressure blower 63 to meet the noise limits around the airport terminal. The fresh air then enters the high-pressure blower 63, and the control device 1 adjusts the speed of the high-pressure blower 63 via the blower frequency converter: when the required static pressure in the cabin is 0.3 MPa, the frequency of the blower frequency converter is set to 35 Hz, and the output air pressure of the high-pressure blower 63 is 0.3 MPa; when the required static pressure is 0.5 MPa, the frequency of the blower frequency converter is set to 50 Hz, and the output air pressure of the high-pressure blower 63 is 0.5 MPa, ensuring that the air supply pressure matches the cabin interface requirements and avoiding energy waste caused by full-load operation.

[0027] Further, please refer to Figure 1 and Figure 2 The three-stage refrigeration mechanism includes a primary refrigeration unit, a secondary refrigeration unit 42, a tertiary refrigeration unit 43, and an electric heating unit 44, all electrically connected to the control device 1. The primary refrigeration unit includes a primary evaporator 4101, the secondary refrigeration unit 42 includes a secondary evaporator, and the tertiary refrigeration unit 43 includes a tertiary evaporator. The air handling surface cooler 31, the primary evaporator 4101, the secondary evaporator, the tertiary evaporator, and the electric heating unit 44 are arranged sequentially along the airflow direction.

[0028] In this embodiment, along the airflow direction, from the air inlet to the air outlet of the air conditioning unit 2, the components of the air handling mechanism are as follows: a fresh air handling mechanism, an air handling surface cooler 31, a primary evaporator 4101, a secondary evaporator, a tertiary evaporator, and an electric heating unit 44. Each component is fixed inside the air conditioning unit 2 by a bracket, and there is a certain distance between adjacent components to ensure smooth airflow without dead zones. The primary evaporator 4101, the secondary evaporator, and the tertiary evaporator are all shell-and-tube heat exchangers. The refrigerant inlet and refrigerant outlet of the shell-and-tube heat exchanger are connected to the expansion valve 4107 and the vapor-liquid separator of the corresponding refrigeration unit, respectively. In actual operation, the outside fresh air first enters the fresh air handling mechanism to form a clean air supply. The system generates a low-noise, high-pressure airflow. The air then passes through the air handling surface cooler 31 for pre-cooling. If the temperature after pre-cooling is still higher than the target outlet temperature, the control device 1 sequentially activates the primary refrigeration unit 41, the secondary refrigeration unit 42, and the tertiary refrigeration unit 43. The refrigerant evaporates and absorbs heat in the evaporator. The air is cooled to 22–25°C by the primary evaporator 4101, to 19–22°C by the secondary evaporator, and to 18–19°C by the tertiary evaporator. Finally, if the relative humidity of the air, as indicated by the humidity sensor 75, is lower than 40%, the control device 1 activates the electric heating unit 44 to raise the air temperature by 1–2°C, indirectly increasing the relative humidity to 40%–60%, ultimately outputting constant temperature and humidity air that meets the cabin requirements.

[0029] In this embodiment, by adopting a gradient air handling method of pre-cooling followed by fine cooling, the problem of excessive operating pressure caused by concentrated load in traditional single-stage refrigeration systems can be effectively avoided, significantly reducing the energy consumption pressure of compressor 4111 operating at full load for a long time, and achieving a reduction in annual operating electricity costs. The three-stage evaporator adopts a load gradient matching design. Through the modular configuration of three independent circuits, it can realize step-by-step start-stop control according to real-time cooling needs. For example, stage 1 is started under low load conditions, stage 2 is started under medium load conditions, and all stages are started under high load conditions, forming a dynamic load matching mechanism, completely solving the problem of energy waste, improving temperature control accuracy, and meeting the stringent requirements of cabin precision equipment for ambient temperature. The electric heating unit 44 can achieve smooth adjustment based on the feedback data from the return air humidity sensor 75, accurately controlling the relative humidity in the cabin within the human comfort range of 40%-60%, effectively avoiding cabin air dryness and energy redundancy caused by overheating, significantly improving the temperature and humidity balance of the cabin environment, and ensuring the physical comfort of passengers on long-haul flights.

[0030] Further, please refer to Figure 1 and Figure 2The primary refrigeration unit, secondary refrigeration unit 42, and tertiary refrigeration unit 43 have the same structure. The primary refrigeration unit further includes a first check valve 4102, an exhaust pressure protector 4103, a condenser 4104, a liquid receiver 4105, a dryer filter 4106, an expansion valve 4107, a gas-liquid separator 4108, a suction pressure protector 4109, a second check valve 4110, and a compressor 4111 electrically connected to the control device 1. The output end of the compressor 4111, the first check valve 4102, the exhaust pressure protector 4103, the condenser 4104, the liquid receiver 4105, the dryer filter 4106, the expansion valve 4107, the primary evaporator 4101, the gas-liquid separator 4108, the suction pressure protector 4109, the second check valve 4110, and the input end of the compressor 4111 are connected sequentially along the refrigerant flow direction.

[0031] In this embodiment, the components are connected sequentially via pipes according to the refrigerant flow direction, specifically in the following order: the output end of compressor 4111, first check valve 4102, discharge pressure protector 4103, condenser 4104, liquid receiver 4105, dryer filter 4106, expansion valve 4107, refrigerant inlet of first-stage evaporator 4101, refrigerant outlet of first-stage evaporator 4101, gas-liquid separator 4108, suction pressure protector 4109, second check valve 4110, and the input end of compressor 4111. The first check valve 4102 and the second check valve 4110 are used to prevent refrigerant backflow. By setting up double check valves, refrigerant reverse flow is prevented, avoiding refrigerant backflow from compressor 4111. 1. After shutdown, the refrigerant on the high-pressure side impacts the low-pressure side, extending the service life of the compressor 4111; the discharge pressure protector 4103 is used to trigger shutdown when the real-time discharge pressure of the compressor 4111 is ≥2.5MPa, and the suction pressure protector 4109 is used to trigger shutdown when the real-time suction pressure of the compressor 4111 is ≤0.1MPa. By real-time monitoring of the suction and discharge pressures of the compressor 4111, combined with the filtering effect of the dryer filter 4106, overpressure damage, ice blockage, dirt blockage and other faults can be effectively avoided, reducing the failure rate of the air conditioning unit; the expansion valve 4107 is an electronic expansion valve 4107, and the opening of the electronic expansion valve 4107 can be adjusted according to the outlet air temperature to accurately regulate the refrigerant flow.

[0032] In this embodiment, when the first-stage refrigeration unit starts, the control device 1 sends a start command to the compressor 4111. The compressor 4111 compresses the refrigerant from a low-pressure gaseous state to a high-pressure gaseous state. The high-pressure gaseous refrigerant enters the condenser 4104 through the first check valve 4102 and the exhaust pressure protector 4103, where it exchanges heat with the ambient air blown by the refrigeration fan and condenses into a high-pressure liquid state. The liquid refrigerant enters the liquid receiver 4105 for temporary storage, and then passes through the dryer filter 4106 to remove moisture and impurities before entering the expansion valve 4107. The expansion valve 4107 throttles and reduces the pressure of the high-pressure liquid refrigerant into a low-pressure gas-liquid mixture, which is then sent to the first-stage evaporator 4101. In the first-stage evaporator 4101, the refrigerant absorbs heat from the air flowing through it and completely evaporates into a low-pressure gaseous state, while the air temperature decreases. The low-pressure gaseous refrigerant returns to the compressor 4111 through the gas-liquid separator 4108, the suction pressure protector 4109, and the second check valve 4110, completing one refrigerant cycle.

[0033] Further, please refer to Figure 1 and Figure 2 The refrigerant circulation assembly includes an ambient cooling surface cooler 321, a first check valve 322, an expansion tank 323, a first filter 324, and a charging valve 325, a venting valve 326, an electric drain valve 327, a first flow switch 328, and a fluid pump 329, all electrically connected to the control device 1. The output end of the ambient cooling surface cooler 321, the venting valve 326, the charging valve 325, the first check valve 322, the first filter 324, the fluid pump 329, the expansion tank 323, the air treatment surface cooler 31, the first flow switch 328, and the input end of the ambient cooling surface cooler 321 are arranged sequentially along the refrigerant flow direction. The electric drain valve 327 is located at the output end of the water collection pan 5 and is used to drain excess condensate collected in the water collection pan 5.

[0034] In this embodiment, the components are connected sequentially via stainless steel pipes according to the refrigerant flow direction, specifically in the following order: output end of ambient cooling surface cooler 321, vent valve 326, charging valve 325, first check valve 322, fluid pump 329, first filter 324, expansion tank 323, air treatment surface cooler 31, first flow switch 328, and input end of ambient cooling surface cooler 321. The expansion tank 323 is a diaphragm type expansion tank. The first flow switch 328 corresponds to a fault threshold of <5L / min. The expansion tank 323, the first check valve 322, and the first flow switch 328 form a pressure stabilizing, backflow prevention, and flow interruption prevention protection system, ensuring the refrigerant circulation... The pressure fluctuation of the mechanism is ≤±0.02MPa, improving the heat exchange efficiency maintenance rate; the vent valve 326, in conjunction with the first filter 324, can effectively prevent nozzle clogging and reduce the failure rate of the cooling cycle mechanism; the electric drain valve 327 is connected to the bottom outlet of the water tray 5 through a branch pipe and is located at the front end of the inlet of the first filter 324, used to realize the automatic discharge of excess condensate, avoiding water overflow from the water tray 5 and damaging the internal electrical components of the air conditioning unit 2, thus improving equipment safety; the fluid pump 329 is equipped with a fluid pump 329 frequency converter electrically connected to the control device 1, which can adjust the flow rate of the fluid pump 329 according to the real-time air outlet temperature to reduce the energy consumption of spray water.

[0035] In this embodiment, when the cooling circulation mechanism is in operation, the fluid pump 329 draws the refrigerant from the output end of the ambient cooling surface cooler 321. After pressurization, the refrigerant passes through the first filter 324 (filtering impurities) and the first check valve 322, and is then sent to the expansion tank 323. The expansion tank 323 absorbs the volume expansion caused by the temperature change of the refrigerant, maintaining stable system pressure. The stabilized refrigerant enters the air handling surface cooler 31, absorbs the heat from the fresh air, and then returns to the ambient cooling surface cooler 321 via the first flow switch 328, completing the cycle. If air is present in the cooling circulation mechanism, causing pressure fluctuations, the vent valve 326 automatically opens to vent until the pressure stabilizes at 0.2-0.3 MPa and then closes. When refrigerant needs to be replenished, it is injected through the charging valve 325 to avoid system liquid shortage. When the liquid level in the water tray 5 is too high or the ambient temperature is too low, the control device 1 opens the electric drain valve 327 to discharge excess condensate to the airport sewage network.

[0036] Further, please refer to Figure 1 and Figure 2 The spray assembly includes a second filter 331, a second check valve 332, and a spray unit 333 and a flow protector 334, which are electrically connected to the control device 1 respectively. The input ends of the water receiving tray 5, the second filter 331, the second check valve 332, the flow protector 334, and the spray unit 333 are arranged sequentially along the water flow direction. The spray unit 333 is used to spray water evenly onto the surface of the ambient cooling surface cooler 321.

[0037] In this embodiment, the components are connected sequentially via PE pipes according to the water flow direction. The specific order is as follows: water outlet of water receiving tray 5, second filter 331, second check valve 332, flow protector 334, and spray unit 333. The spray unit 333 includes a spray water pump 3331 electrically connected to the control device 1, a spray pipe, and nozzles. The spray pipe is arranged in a ring above the ambient cooling heat exchanger to ensure that the atomized water completely covers the surface of the surface cooler. There are 8 nozzles, each with an atomization angle of 60° and a spacing of 15cm between adjacent nozzles.

[0038] In this embodiment, when the ambient temperature is >25℃ and the liquid level in the water receiving pan 5 is ≥10cm, the control device 1 starts the spray assembly; the condensate in the water receiving pan 5 is filtered by the second filter 331 to remove algae and impurities, and then enters the second check valve 332; the flow protector 334 monitors the water flow rate, and if it is ≥3L / min, the water enters the spray water pump 3331 of the spray unit 333, is pressurized to 0.2MPa, and then atomized through the nozzles, and evenly sprayed onto the surface of the ambient cooling surface cooler 321; the atomized water evaporates and absorbs heat on the surface cooler, reducing the temperature of the refrigerant from 32-35℃ to 25-28℃. Enhanced heat dissipation; unevaporated water drips down the surface of the surface cooler and flows into the external spray water collection tray 5 to achieve spray water recycling; if the flow protector 334 detects a flow rate <3L / min, and the second filter 331 is clogged, an alarm signal is immediately sent to the control device 1, which then stops the machine and prompts for cleaning the second filter 331; by recycling condensate, the consumption of external cooling water is reduced, saving water costs; by enhancing the heat dissipation of the refrigerant through atomized spraying, the heat exchange efficiency of the ambient cooling surface cooler 321 can be improved, ensuring that the refrigerant temperature can still be maintained at ≤28℃ under high summer temperatures.

[0039] Further, please refer to Figure 1 and Figure 2 The aircraft ground air conditioning unit based on the cooling cycle further includes a first temperature sensor 71 for acquiring ambient temperature, a second temperature sensor 72 for acquiring the air outlet temperature of the air conditioning unit, a first pressure sensor 73 for acquiring the air outlet pressure of the air conditioning unit, a second pressure sensor 74 for acquiring the exhaust pressure of the compressor 4111, and a humidity sensor 75 for acquiring ambient humidity. A liquid level sensor 76 is provided in the water receiving tray 5. The first temperature sensor 71, the second temperature sensor 72, the first pressure sensor 73, the second pressure sensor 74, the humidity sensor 75, and the liquid level sensor 76 are electrically connected to the control device 1.

[0040] In this embodiment, the first temperature sensor 71 is installed on the outside of the fresh air inlet and electrically connected to the control device 1 via a wire. It is used to collect the ambient temperature, providing a basis for the start / stop of the spray assembly, the start of the refrigeration unit, and the adjustment of the state of the electric drain valve 327. The second temperature sensor 72 is installed at the air outlet of the air conditioning unit 2 and electrically connected to the control device 1. It is used to collect the output air temperature, i.e., the outlet air temperature, providing a basis for adjusting the spray flow rate and the cooling intensity. The first pressure sensor 73 is installed on the air outlet duct and electrically connected to the control device 1. It is used to collect the supply air static pressure, i.e., the outlet air pressure, providing a basis for adjusting the frequency of the high-pressure blower 63. The refrigerant discharge pressure is collected by the refrigerant discharge sensor 74, which is installed at the discharge end of the compressor 4111 of the first-stage refrigeration unit, the second-stage refrigeration unit 42, and the third-stage refrigeration unit 43, and is electrically connected to the control device 1. This sensor provides a basis for adjusting the speed of the refrigeration fan and for protecting the compressor 4111 from shutdown. The humidity sensor 75 is installed at the air outlet of the air conditioning unit, adjacent to the second temperature sensor 72, and is electrically connected to the control device 1. This sensor collects the humidity of the output air and provides a basis for adjusting the power of the electric heating unit 44. The liquid level sensor 76 is installed on the inner wall of the water receiving pan 5 and is electrically connected to the control device 1. This sensor collects the real-time liquid level of the water receiving pan 5 and provides a basis for starting and stopping the electric drain valve 327.

[0041] Please see Figure 3 The present invention also provides a control method for an aircraft ground air conditioning unit based on a cooling cycle, the control method being used to implement the operation control of the aircraft ground air conditioning unit as described above, wherein the output end of the water receiving pan 5 is provided with an electric drain valve 327; the control method includes: 101. Obtain the preset ambient temperature threshold range, the preset air outlet temperature threshold range, the preset drainage temperature threshold range, and the preset drainage liquid level threshold range. In this embodiment, the control device 1 is pre-set with a basic threshold range before leaving the factory. Users can adjust it according to the actual needs of the airport through the display operating system. Specifically, the preset ambient temperature threshold range is 25-35℃; the preset air outlet temperature threshold range is 22±1℃; the preset drainage temperature threshold range is 15-25℃; and the preset drainage liquid level threshold range is 10-20cm.

[0042] 102. Obtain the real-time ambient temperature fed back by the first temperature sensor 71, the real-time air outlet temperature fed back by the second temperature sensor 72, and the real-time water level fed back by the liquid level sensor 76. 103. Based on the comparison results of real-time ambient temperature and preset ambient temperature threshold range, and the comparison results of real-time water level and preset drainage level threshold range, control the spray assembly to start or stop supplying spray water, and when the spray assembly starts supplying spray water, adjust the working state of the cooling circulation assembly based on the comparison results of real-time air outlet temperature and preset air outlet temperature threshold range. 104. Based on the comparison results between the real-time ambient temperature and the preset drainage temperature threshold range, adjust the working status of the electric drain valve 327.

[0043] In this embodiment, the control logic covers the core processes of spraying and drainage, realizing fully automated operation without manual supervision, reducing labor costs; based on the comparison control between real-time data and preset threshold range, it avoids excessive spraying and ineffective drainage, improves water resource utilization, and reduces unit operating energy consumption.

[0044] Further, in this embodiment of the invention, the cooling circulation assembly includes a fluid pump 329 and an ambient cooling surface cooler 321, wherein the ambient cooling surface cooler 321 delivers refrigerant to the air handling surface cooler 31 via the fluid pump 329; the spray unit 333 includes a spray water pump 3331, which is used to deliver spray water for cooling the ambient cooling surface cooler 321; the spray assembly is controlled to start or stop delivering spray water based on a comparison between the real-time ambient temperature and a preset ambient temperature threshold range, and a comparison between the real-time water level and a preset drainage level threshold range; and when the spray assembly starts delivering spray water, the operating state of the cooling circulation assembly is adjusted based on a comparison between the real-time outlet air temperature and a preset outlet air temperature threshold range, including: 201. When the preset lower limit of ambient temperature ≤ real-time ambient temperature ≤ preset upper limit of ambient temperature, and the real-time water level ≥ preset upper limit of drainage level, control the spray pump 3331 to maintain its original operation. 202. When the preset lower limit of ambient temperature is less than the real-time ambient temperature, or the real-time water level is less than the preset lower limit of drainage level, control the spray pump 3331 to shut down. 203. When the real-time ambient temperature is greater than the preset upper limit of ambient temperature and the real-time water level is greater than or equal to the preset upper limit of drainage level, control the spray pump 3331 to start. 204. When the preset lower limit of the outlet air temperature is less than or equal to the real-time outlet air temperature, the preset upper limit of the outlet air temperature is less than or equal to the preset upper limit of the outlet air temperature, the control fluid pump 329 shall continue to operate in its original state. 205. When the real-time outlet air temperature is greater than the preset upper limit of the outlet air temperature, control the fluid pump 329 to load; 203. When the real-time outlet air temperature is less than the preset lower limit of the outlet air temperature, control the fluid pump 329 to unload.

[0045] In this embodiment, when the preset lower ambient temperature is less than or equal to the real-time ambient temperature, and the real-time water level is greater than or equal to the preset upper drain level, if the fluid pump 329 is already turned on, it will continue to operate at the current frequency; if it is already turned off, it will remain off. When the real-time ambient temperature is less than the preset lower ambient temperature, no pre-cooling spray is required. Or when the real-time water level is less than the preset lower drain level, the water level in the water tray 5 is insufficient. The control device 1 sends a stop command, and the fluid pump 329 immediately stops running. At the same time, the spare shut-off valve of the spray pipe is closed to prevent residual water from flowing back. When the real-time ambient temperature is greater than the preset upper ambient temperature, and the real-time water level is greater than or equal to the preset upper drain level, the control device 1 sends a start command, and the fluid pump 329 starts running from the initial frequency of 20Hz and gradually increases to 30Hz. When fluid pump 329 is on, if the preset lower limit of the outlet air temperature is less than or equal to the real-time outlet air temperature and the preset upper limit of the outlet air temperature, fluid pump 329 maintains its current frequency. If the real-time outlet air temperature is greater than the preset upper limit of the outlet air temperature, fluid pump 329 is loaded, and the frequency of the fluid pump 329 inverter increases by 5Hz, adjusting once every 30 seconds until the real-time outlet air temperature is less than or equal to 23℃. If the real-time outlet air temperature is less than the preset lower limit of the outlet air temperature, fluid pump 329 is unloaded, and the frequency of the inverter decreases by 5Hz, adjusting once every 30 seconds until the real-time outlet air temperature is greater than or equal to 21℃. Loading and unloading are adjusted in a stepwise manner to avoid sudden changes in flow rate that could cause fluctuations in outlet air temperature and improve temperature control stability. Furthermore, fluid pump 329 is controlled based on three conditions: ambient temperature, water level, and outlet air temperature, to avoid blind start-up and shutdown or improper flow rate, reducing the energy consumption of the spray system while ensuring stable pre-cooling effect.

[0046] In this embodiment, if the real-time water level is <10cm but the real-time ambient temperature is >35℃, the control device 1 first turns on the external water supply pump to replenish water to the water receiving pan 5, and then starts the fluid pump 329 after the real-time water level is ≥10cm, so as to avoid waterless spraying and improve the operational reliability of the spraying mechanism.

[0047] Furthermore, in this embodiment of the invention, adjusting the operating state of the electric drain valve 327 based on the comparison result between the real-time ambient temperature and the preset drainage temperature threshold range includes: 301. When the preset lower limit of the drainage temperature is less than or equal to the real-time ambient temperature, and the preset upper limit of the drainage temperature is less than or equal to the preset upper limit of the drainage temperature, the electric drain valve 327 is controlled to maintain its original operation. 302. When the real-time ambient temperature exceeds the preset upper limit of the drainage temperature, control the electric drain valve 327 to close. 303. When the real-time ambient temperature is less than the preset lower limit of the drainage temperature, control the electric drain valve 327 to open.

[0048] In this embodiment, when the preset lower limit of the drainage temperature is less than or equal to the real-time ambient temperature and less than or equal to the preset upper limit of the drainage temperature, if the electric drain valve 327 is currently closed, it remains closed; if it is currently open, it remains open until the liquid level drops to 10cm and then closes. When the real-time ambient temperature is greater than the preset upper limit of the drainage temperature, the control device 1 sends a closing command, and the electric drain valve 327 immediately closes, so that all the water in the water tray 5 is used for spray circulation, avoiding water waste. When the real-time ambient temperature is less than the preset lower limit of the drainage temperature, the control device 1 sends an opening command, and the electric drain valve 327 fully opens, draining the excess condensate in the water tray 5 to the sewage pipe network, preventing the water tray 5 from overflowing. In addition to the ambient temperature, if the liquid level sensor 76 detects that the real-time water level is greater than 20cm, regardless of whether the real-time ambient temperature is greater than 15°C, the control device 1 opens the electric drain valve 327 until the real-time water level in the water tray 5 is less than or equal to 15cm and then closes to prevent overflow. In this embodiment, drainage control based on ambient temperature prioritizes water circulation in summer to improve water resource utilization; timely drainage in winter prevents overflow or freezing and enhances equipment protection; and by setting a dual-trigger logic for liquid level, the risk of overflow when the temperature is normal but the liquid level is too high is resolved, thereby improving unit safety.

[0049] To ensure the unit can still meet the nacelle's requirements under extreme high-temperature conditions, the control and cooling effect adjustment of the three-stage refrigeration system have been further refined, specifically: When the real-time outlet air temperature is >23℃ for 30 seconds, control device 1 starts the first-stage refrigeration unit, with the expansion valve 4107 initially open at 50%. After the first-stage refrigeration unit starts, if the real-time outlet air temperature is still >22℃ for 30 seconds, the second-stage refrigeration unit 42 starts, with the expansion valve 4107 initially open at 40%. After the second-stage refrigeration unit 42 starts, if the real-time outlet air temperature is still >21℃ for 30 seconds, the third-stage refrigeration unit 43 starts, with the expansion valve 4107 initially open at 30%. When the real-time outlet air temperature is <21℃ for 60 seconds, the unit will be shut down in the order of the third-stage refrigeration unit 43, the second-stage refrigeration unit 42, and the first-stage refrigeration unit, with one refrigeration unit shut down every 30 seconds to avoid a sudden drop in temperature; if the exhaust pressure of a certain refrigeration unit is ≥2.5MPa, that refrigeration unit will be shut down first, and restarted after the exhaust pressure drops below 2.0MPa. If the real-time outlet air temperature is >22℃, the control device 1 increases the opening of the expansion valve 4107 of the currently operating refrigeration unit to increase the refrigerant flow and improve the heat exchange efficiency. This adjustment is made once every 20 seconds until the real-time outlet air temperature is ≤22℃. If the real-time outlet air temperature is <21℃, the opening of the expansion valve 4107 is reduced to decrease the refrigerant flow. This adjustment is made once every 20 seconds until the real-time outlet air temperature is ≥21℃.

[0050] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. An aircraft ground air conditioning unit based on a cooling cycle, characterized in that, The system includes a control device, an air conditioning unit, and a cooling mechanism, a three-stage refrigeration mechanism, and a water collection tray disposed within the air conditioning unit. The water collection tray is located at the bottom of the air conditioning unit and is used to collect condensate from the cooling mechanism and the three-stage refrigeration mechanism. The cooling mechanism includes an air handling surface cooler, a cooling circulation component, and a spray component. The input end of the spray component is connected to the water collection tray, and the output end of the spray component is used to provide cooling spray water to the cooling circulation component. The cooling circulation assembly is connected to the air handling surface cooler and is used to supply cooling capacity to the air handling surface cooler; the air handling surface cooler and the three-stage refrigeration mechanism are arranged sequentially along the airflow direction; the cooling circulation assembly, the spray assembly, and the three-stage refrigeration mechanism are respectively electrically connected to the control device.

2. The aircraft ground air conditioning unit based on a cooling cycle according to claim 1, characterized in that, The air conditioning unit is also equipped with a fresh air handling mechanism that is electrically connected to the control device. The fresh air handling mechanism is located on the input side of the air handling surface cooler. The fresh air handling mechanism includes an air filter, a silencer, and a high-pressure blower arranged sequentially along the air flow direction. The high-pressure blower is equipped with a blower frequency converter, which is electrically connected to the control device.

3. The aircraft ground air conditioning unit based on a cooling cycle according to claim 1, characterized in that, The three-stage refrigeration mechanism includes a primary refrigeration unit, a secondary refrigeration unit, a tertiary refrigeration unit, and an electric heating unit, all electrically connected to the control device. The primary refrigeration unit includes a primary evaporator, the secondary refrigeration unit includes a secondary evaporator, and the tertiary refrigeration unit includes a tertiary evaporator. The air handling surface cooler, the primary evaporator, the secondary evaporator, the tertiary evaporator, and the electric heating unit are arranged sequentially along the airflow direction.

4. An aircraft ground air conditioning unit based on a cooling cycle according to claim 3, characterized in that, The primary, secondary, and tertiary refrigeration units have the same structure. The primary refrigeration unit further includes a first check valve, a discharge pressure protector, a condenser, a liquid receiver, a dryer filter, an expansion valve, a gas-liquid separator, a suction pressure protector, a second check valve, and a compressor electrically connected to the control device. The output end of the compressor, the first check valve, the discharge pressure protector, the condenser, the liquid receiver, the dryer filter, the expansion valve, the primary evaporator, the gas-liquid separator, the suction pressure protector, the second check valve, and the input end of the compressor are connected sequentially along the refrigerant flow direction.

5. An aircraft ground air conditioning unit based on a cooling cycle according to claim 1, characterized in that, The refrigerant circulation assembly includes an ambient cooling surface cooler, a first check valve, an expansion tank, a first filter, and a charging valve, a venting valve, an electric drain valve, a first flow switch, and a fluid pump, all electrically connected to the control device. The output end of the ambient cooling surface cooler, the venting valve, the charging valve, the first check valve, the first filter, the fluid pump, the expansion tank, the air handling surface cooler, the first flow switch, and the input end of the ambient cooling surface cooler are arranged sequentially along the refrigerant flow direction. The electric drain valve is located at the output end of the water collection pan and is used to drain excess condensate collected in the water collection pan.

6. An aircraft ground air conditioning unit based on a cooling cycle according to claim 5, characterized in that, The spray assembly includes a second filter, a second check valve, and a spray unit and a flow protector that are electrically connected to the control device respectively; the input ends of the water receiving tray, the second filter, the second check valve, the flow protector, and the spray unit are arranged sequentially along the water flow direction; the spray unit is used to spray water evenly onto the surface of the ambient cooling surface cooler.

7. An aircraft ground air conditioning unit based on a cooling cycle according to claim 6, characterized in that, It also includes a first temperature sensor for acquiring ambient temperature, a second temperature sensor for acquiring the air outlet temperature of the air conditioner unit, a first pressure sensor for acquiring the air outlet pressure of the air conditioner unit, a second pressure sensor for acquiring the compressor discharge pressure, and a humidity sensor for acquiring ambient humidity. A liquid level sensor is provided in the water receiving tray. The first temperature sensor, the second temperature sensor, the first pressure sensor, the second pressure sensor, the humidity sensor, and the liquid level sensor are all electrically connected to the control device.

8. A control method for an aircraft ground air conditioning unit based on a cooling cycle, characterized in that, The control method is used to implement the operational control of the aircraft ground air conditioning unit as described in claim 7, wherein the output end of the water receiving pan is equipped with an electric drain valve; the control method includes: Obtain the preset ambient temperature threshold range, the preset air outlet temperature threshold range, the preset drainage temperature threshold range, and the preset drainage liquid level threshold range. The system acquires the real-time ambient temperature fed back by the first temperature sensor, the real-time outlet air temperature fed back by the second temperature sensor, and the real-time water level fed back by the liquid level sensor. Based on the comparison results of real-time ambient temperature and preset ambient temperature threshold range, and the comparison results of real-time water level and preset drainage level threshold range, the spray assembly is controlled to start or stop supplying spray water. When the spray assembly starts supplying spray water, the working state of the cooling circulation assembly is adjusted based on the comparison results of real-time air outlet temperature and preset air outlet temperature threshold range. Based on the comparison between real-time ambient temperature and preset drainage temperature threshold range, the operating status of the electric drain valve is adjusted.

9. The control method according to claim 8, characterized in that, The cooling circulation assembly includes a fluid pump and an ambient cooling surface cooler, the ambient cooling surface cooler supplying refrigerant to the air handling surface cooler via the fluid pump; the spray unit includes a spray water pump, the spray water pump being used to supply spray water for cooling the ambient cooling surface cooler; the spray assembly is controlled to start or stop supplying spray water based on a comparison between the real-time ambient temperature and a preset ambient temperature threshold range, and a comparison between the real-time water level and a preset drainage level threshold range, and when the spray assembly starts supplying spray water, the operating state of the cooling circulation assembly is adjusted based on a comparison between the real-time outlet air temperature and a preset outlet air temperature threshold range, including: When the preset lower limit of ambient temperature is less than or equal to the real-time ambient temperature, and the real-time water level is greater than or equal to the preset upper limit of drainage level, the spray pump is controlled to maintain its original operation. When the preset lower limit of ambient temperature is less than the real-time ambient temperature, or the real-time water level is less than the preset lower limit of drainage level, the spray pump will be shut down. When the real-time ambient temperature is greater than the preset upper limit of ambient temperature and the real-time water level is greater than or equal to the preset upper limit of drainage level, the spray pump will be turned on. When the preset lower limit of the outlet air temperature is less than or equal to the real-time outlet air temperature, the control fluid pump will continue to operate in its original state. When the real-time outlet air temperature exceeds the preset upper limit of the outlet air temperature, the fluid pump is controlled to load. When the real-time outlet air temperature is less than the preset lower limit of the outlet air temperature, the control fluid pump is unloaded.

10. The control method according to claim 8, characterized in that, The adjustment of the electric drain valve's operating state based on the comparison between real-time ambient temperature and a preset drainage temperature threshold range includes: When the preset lower limit of the drainage temperature is less than or equal to the real-time ambient temperature, and the preset upper limit of the drainage temperature is less than or equal to the preset upper limit of the drainage temperature, the electric drain valve is controlled to maintain its original operation. When the real-time ambient temperature exceeds the preset upper limit of the drainage temperature, the electric drain valve will be closed. When the real-time ambient temperature is less than the preset lower limit of the drainage temperature, the electric drainage valve is opened.

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