A large subcooling aircraft ground air conditioning system with solar-powered coupled compressor refrigeration

Abstract

The present invention discloses a large-subcooling aircraft ground air-conditioning system with solar-energy-coupled compressor refrigeration. The air-conditioning system comprises a solar-energy-jet refrigeration system, a primary compression refrigeration system, a secondary compression refrigeration system, and an air supply system arranged in an air duct. The air supply system comprises a first evaporator, a second evaporator, a third evaporator, and an air blower. The first evaporator, the second evaporator, the air blower, and the third evaporator are sequentially arranged in the air duct. The first evaporator is connected to the solar-energy-jet refrigeration system, the primary compression refrigeration system is respectively connected to the second evaporator and the solar-energy-jet refrigeration system, and the secondary compression refrigeration system is respectively connected to the third evaporator and the solar-energy-jet refrigeration system. Advantages: The present invention utilizes solar energy natural resources to reduce the power consumption of the aircraft ground air-conditioning unit, thereby achieving the effect of energy conservation and emission reduction, while also improving the refrigeration COP of the air-conditioning unit.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a large subcooling aircraft ground air conditioning system with solar-powered coupled compressor refrigeration. Background Art

[0002] Aircraft ground air conditioning units are equipment that provide fresh, filtered, pressurized, dehumidified, and / or heated air to aircraft parked on the ground. In recent years, Chinese airports have actively promoted policies such as the conversion of on-site vehicles to electric power and the replacement of aircraft APUs. This has led to a growing share of electricity in airport energy consumption nationwide, posing a significant safety risk to the power grid. Due to the vast expanses of airport space and strong solar radiation, utilizing abundant solar resources to reduce electricity consumption is crucial for achieving energy conservation and emission reduction. To this end, we designed a solar-powered, compressor-coupled, high-subcooling aircraft ground air conditioning system. Summary of the Invention

[0003] To overcome the shortcomings of the above-mentioned background technology, the present invention proposes a solar-coupled compressor refrigeration large subcooling aircraft ground air conditioning system, which reduces the power consumption of the aircraft ground air conditioning unit by utilizing solar energy natural resources, while improving the cooling COP of the air conditioning unit.

[0004] The technical solutions adopted are:

[0005] A solar-coupled compressor-refrigerated, highly subcooled aircraft ground air conditioning system comprises a solar jet refrigeration system, a first-stage compression refrigeration system, a second-stage compression refrigeration system, and an air supply system disposed within an air duct. The air supply system comprises a first evaporator, a second evaporator, a third evaporator, and an air blower. The first evaporator, the second evaporator, the air blower, and the third evaporator are sequentially disposed within the air duct. The first evaporator is connected to the solar jet refrigeration system, the first-stage compression refrigeration system is respectively connected to the second evaporator and the solar jet refrigeration system, and the second-stage compression refrigeration system is respectively connected to the third evaporator and the solar jet refrigeration system.

[0006] In a further preferred embodiment of the technical solution of the present invention, the solar ejector refrigeration system includes a refrigerant pump, a first condenser, an ejector, a solar collector and a preheater;

[0007] The output end of the refrigerant pump is connected to the input end of the preheater, the output end of the preheater is connected to the input end of the solar collector, the output end of the solar collector is connected to the input end of the ejector, the output end of the ejector is connected to the input end of the first condenser, and the output of the first condenser is divided into two paths, one path is connected to the input end of the refrigerant pump, and the other path is divided into two branches, one branch is connected to the two-stage compression refrigeration system through the third expansion valve, and the other branch is divided into two branches, one branch is connected to the input end of the ejector through the first expansion valve, and the other branch is connected to the one-stage compression refrigeration system through the second expansion valve; the solar ejector refrigeration system mainly improves the ejector performance by increasing the ejector pressure, combines the advantages of mechanical compression refrigeration cycle and steam ejection refrigeration cycle, has high thermal economy, uses the solar collector as the heat source drive of the system, thereby replacing electric energy to achieve the cooling effect and achieve the effect of energy saving and emission reduction.

[0008] In a further preferred embodiment of the technical solution of the present invention, the one-stage compression refrigeration system includes a first compressor, a first gas-liquid separator, a second condenser and a first economizer;

[0009] The output of the first compressor is divided into two paths, one path is directly connected to the input end of the second condenser, and the other path is connected to the input end of the second condenser through the preheater. The output end of the second condenser is connected to the input end of the second evaporator after passing through the first economizer and the fourth expansion valve in sequence. The output end of the second evaporator is connected to the input end of the first gas-liquid separator, and the output end of the first gas-liquid separator is connected to the input end of the first compressor; the first economizer provides a large amount of supercooling for the one-stage compression refrigeration system, which can increase the cooling capacity of the one-stage compression refrigeration system and improve the COP of the air-conditioning system. The first compressor is connected to the preheater, which can provide heat for the preheater, realize energy recovery and utilization, and achieve the effect of energy saving and emission reduction.

[0010] In a further preferred embodiment of the technical solution of the present invention, a first solenoid valve is provided between the first compressor and the preheater; the first solenoid valve is used to control whether the refrigerant in the first compressor flows through the preheater.

[0011] In a further preferred embodiment of the technical solution of the present invention, a second solenoid valve is provided on the path directly connecting the first compressor and the second condenser; the second solenoid valve is used to control whether the refrigerant in the first compressor can flow directly into the second condenser.

[0012] In a further preferred embodiment of the technical solution of the present invention, the two-stage compression refrigeration system includes a second compressor, a third condenser, a second gas-liquid separator and a second economizer;

[0013] The output of the second compressor is divided into two paths, one path is directly connected to the input end of the third condenser, and the other path is connected to the input end of the third condenser through the preheater. The output end of the third condenser is connected to the input end of the third evaporator after passing through the second economizer and the fifth expansion valve in sequence. The output end of the third evaporator is connected to the input end of the second gas-liquid separator, and the output end of the second gas-liquid separator is connected to the input end of the second compressor; the second economizer provides a large amount of supercooling for the two-stage compression refrigeration system, which can increase the cooling capacity of the two-stage compression refrigeration system and improve the COP of the air-conditioning system. The second compressor is connected to the preheater, which can provide heat for the preheater, realize energy recovery and utilization, and achieve the effect of energy saving and emission reduction.

[0014] In a further embodiment of the technical solution of the present invention, a third solenoid valve is provided between the second compressor and the preheater; the third solenoid valve is used to control whether the refrigerant in the second compressor flows through the preheater.

[0015] In a further preferred embodiment of the technical solution of the present invention, a fourth solenoid valve is provided on the path directly connecting the second compressor and the third condenser; the fourth solenoid valve is used to control whether the refrigerant in the second compressor can flow directly into the third condenser.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention utilizes a solar-powered jet cooling system to increase ejector pressure, thereby enhancing ejector performance. This system combines the advantages of both mechanical compression and steam-powered refrigeration cycles, resulting in high thermal efficiency. Furthermore, airports are located in open areas with abundant solar energy resources, and solar-powered jet cooling technology utilizes solar collectors as the heat source to drive the system, replacing electrical energy to achieve cooling. This combination not only reduces the air conditioning system's energy consumption but also its installed power, ensuring safe electricity use at the airport.

[0018] 2. The present invention uses a solar jet refrigeration system to provide an air pre-cooling function for the air supply system. On the other hand, the newly added first economizer and second economizer provide substantial supercooling for the first-stage compression refrigeration system and the second-stage compression refrigeration system, thereby increasing the cooling capacity of the first-stage compression refrigeration system and the second-stage compression refrigeration system while improving the COP of the unit.

[0019] 3. The present invention utilizes the refrigerant discharged from the first compressor and the second compressor as the heat source of the generator of solar jet refrigeration. On the one hand, it can avoid the intermittent shortage of solar energy that causes unstable working conditions of the air-conditioning system during operation, thereby improving the stability of the system. On the other hand, it can also reduce the heat exchange area of ​​the second condenser and the third condenser, reduce consumables, and play a mutually reinforcing role. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the air conditioning system;

[0021] Figure 2 This is the schematic diagram of the air conditioning system under the working condition of sufficient solar energy utilization;

[0022] Figure 3 This is a schematic diagram of an air conditioning system that uses a primary compression refrigeration system to provide heat for a solar ejection refrigeration system under conditions where solar energy utilization is insufficient;

[0023] Figure 4 This is a schematic diagram of an air conditioning system that uses a two-stage compression refrigeration system to provide heat for a solar ejection refrigeration system under conditions where solar energy utilization is insufficient;

[0024] Figure 5 This is the schematic diagram of the air conditioning system under the condition that solar energy cannot be used;

[0025] Explanation of the accompanying symbols: 1-air supply system, 2-solar injection refrigeration system, 3-one-stage compression refrigeration system, 4-two-stage compression refrigeration system, 101-first evaporator, 102-second evaporator, 103-third evaporator, 104-air blower, 201-refrigerant pump, 202-preheater, 203-solar collector, 204-ejector, 205-first condenser, 206-first expansion valve, 207-second expansion valve, 208-third expansion valve, 301-first compressor, 302-second condenser, 303-first gas-liquid separator, 304-fourth expansion valve, 305-first solenoid valve, 306-second solenoid valve, 307-first economizer, 401-second compressor, 402-third condenser, 403-second gas-liquid separator, 404-fifth expansion valve, 405-third solenoid valve, 406-fourth solenoid valve, 407-second economizer. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following Figure 1-5 It should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the present invention.

[0027] like Figure 1-5 As shown, a large subcooling aircraft ground air conditioning system with solar-coupled compressor refrigeration in this embodiment includes an air supply system 1, a solar-jet refrigeration system 2, a first-stage compression refrigeration system 3, and a second-stage compression refrigeration system 4.

[0028] The air supply system 1 is arranged in the air duct, and the air supply system 1 includes a first evaporator 101, a second evaporator 102, a third evaporator 103 and a blower 104. The first evaporator 101, the second evaporator 102, the blower 104 and the third evaporator 103 are arranged in the air duct in sequence. External air flows into the air duct through the air inlet of the air duct. Under the action of the blower 104, the air in the air duct flows through the first evaporator 101, the second evaporator 102 and the third evaporator 103 and is cooled in sequence. After meeting the air supply requirements, the air is sent into the interior of the aircraft.

[0029] The solar ejector refrigeration system 2 includes a refrigerant pump 201 , a first condenser 205 , an ejector 204 , a solar collector 203 , a preheater 202 , a first expansion valve 206 , a first economizer 307 , a second expansion valve 207 , a second economizer 407 and a third expansion valve 208 .

[0030] The output end of the refrigerant pump 201 is connected to the input end of the preheater 202, the output end of the preheater 202 is connected to the input end of the solar collector, the output end of the solar collector is connected to the input end of the ejector 204, the output end of the ejector 204 is connected to the input end of the first condenser 205, and the output of the first condenser 205 is divided into two paths, one path is connected to the input end of the refrigerant pump 201, and the other path is further divided into two branches, one branch is connected to the two-stage compression refrigeration system 4 through the third expansion valve 208, and the other branch is further divided into two branches, one branch is connected to the input end of the ejector 204 through the first expansion valve 206, and the other branch is connected to the one-stage compression refrigeration system 3 through the second expansion valve 207.

[0031] The one-stage compression refrigeration system 3 includes a first compressor, a second condenser 302 , a fourth expansion valve 304 , a first gas-liquid separator 303 , a first solenoid valve 305 and a second solenoid valve 306 .

[0032] The output of the first compressor is divided into two paths, one path is directly connected to the input end of the second condenser 302, and the other path is connected to the input end of the second condenser 302 through the preheater 202. The output end of the second condenser 302 is connected to the input end of the second evaporator 102 through the first economizer 307 and the fourth expansion valve 304. The output end of the second evaporator 102 is connected to the input end of the first gas-liquid separator 303, and the output end of the first gas-liquid separator 303 is connected to the input end of the first compressor.

[0033] The first solenoid valve 305 is arranged between the first compressor 301 and the preheater 202; it is used to control whether the refrigerant in the first compressor flows through the preheater 202; the second solenoid valve 306 is arranged on a path directly connecting the first compressor and the second condenser 302; it is used to control whether the refrigerant in the first compressor can flow directly into the second condenser 302.

[0034] The two-stage compression refrigeration system 4 includes a second compressor, a third condenser 402 , a fifth expansion valve 404 , a second gas-liquid separator 403 , a third solenoid valve 405 and a fourth solenoid valve 406 .

[0035] The output of the second compressor is divided into two paths, one path is directly connected to the input end of the third condenser 402, and the other path is connected to the input end of the third condenser 402 through the preheater 202. The output end of the third condenser 402 is connected to the input end of the third evaporator 103 through the second economizer 407 and the fifth expansion valve 404. The output end of the third evaporator 103 is connected to the input end of the second gas-liquid separator 403, and the output end of the second gas-liquid separator 403 is connected to the input end of the second compressor.

[0036] The third solenoid valve 405 is arranged between the second compressor 401 and the preheater 202; it is used to control whether the refrigerant in the second compressor flows through the preheater 202; the fourth solenoid valve 406 is arranged on a path directly connecting the second compressor and the third condenser 402; it is used to control whether the refrigerant in the second compressor can directly flow into the third condenser 402.

[0037] The air-conditioning system of this embodiment can operate under three conditions, specifically: under a condition where solar energy utilization is sufficient, under a condition where solar energy utilization is insufficient, and under a condition where solar energy cannot be utilized.

[0038] like Figure 2 As shown in the figure, under the condition of sufficient solar energy utilization, the principle of the air-conditioning system is described as follows:

[0039] The first solenoid valve 305 and the third solenoid valve 405 are closed, the second solenoid valve 306 and the fourth solenoid valve 406 are open, and there is sufficient solar heat, so there is no need to activate the preheater 202.

[0040] The operation process of the solar ejector refrigeration system 2 is as follows: the working fluid pressurized by the refrigerant pump 201 enters the solar collector 203, and is heated by the solar collector 203 to form high-temperature and high-pressure steam; the steam attracts the low-pressure steam generated in the first evaporator 101 through the nozzle of the ejector 204 and enters the mixing chamber in the ejector 204. After the mixed steam flows through the diffusion chamber, its speed decreases and its pressure increases. The high-pressure steam enters the first condenser 205 and is cooled into liquid. It is then divided into two paths. One path is pressurized by the refrigerant pump 201 and sent to the solar collector 203 for reheating to generate working steam; the other path is further divided into two paths. One path is sent to the second economizer 407 for depressurization after passing through the third expansion valve 208 to realize the subcooling function of the two-stage compression refrigeration system 4; the other path is further divided into two paths. One path is sent to the first evaporator 101 for further evaporation and cooling after depressurization after passing through the first expansion valve 206; the other path is sent to the first economizer 307 for depressurization after passing through the second expansion valve 207 to realize the subcooling function of the one-stage compression refrigeration system 3.

[0041] Subsequently, the working fluid output from the first evaporator 101 , the working fluid output from the first economizer 307 , the working fluid 407 output from the second economizer, and the working fluid output from the solar collector 203 are mixed at the input end of the ejector 204 to continue to complete the refrigeration cycle.

[0042] The operation process of the one-stage compression refrigeration system 3 is as follows: the first compressor sucks in low-temperature and low-pressure refrigerant, which is compressed into a high-temperature and high-pressure gas and directly enters the second condenser 302 through the pipeline and the second solenoid valve 306 for condensation. The first economizer 307 is then used to supercool the refrigerant into a liquid, and then the pressure is reduced by the fourth expansion valve 304 to become a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant evaporates in the second evaporator 102 and absorbs heat. After taking away the heat of the air in the air duct, it flows into the first gas-liquid separator 303 and the first compressor to continue to complete the refrigeration cycle.

[0043] The operation process of the two-stage compression refrigeration system 4 is as follows: the second compressor sucks in low-temperature and low-pressure refrigerant, which is compressed into a high-temperature and high-pressure gas and directly enters the third condenser 402 through the pipeline and the fourth solenoid valve 406 for condensation. The refrigerant is then supercooled into liquid by the second economizer 407, and then reduced in pressure by the fifth expansion valve 404 to become a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant evaporates and absorbs heat in the third evaporator 103, takes away the heat of the air in the air duct, and then flows into the second gas-liquid separator 403 and the second compressor to continue to complete the refrigeration cycle.

[0044] The blower 104 is activated, and the air in the air duct flows through the first evaporator 101, the second evaporator 102 and the third evaporator 103, and is cooled in sequence until the air supply requirement is met, and then the air is sent into the aircraft.

[0045] Under the condition of insufficient solar energy utilization, the principle of the air-conditioning system is described as follows:

[0046] Specifically, there are two situations: using the condensation heat of the first-stage compression refrigeration system 3 to supplement the heat supply of the solar injection refrigeration system 2; and using the condensation heat of the second-stage compression refrigeration system 4 to supplement the heat supply of the solar injection refrigeration system 2.

[0047] The second solenoid valve 306 and the third solenoid valve 405 are closed, and the first solenoid valve 305 and the fourth solenoid valve 406 are opened; when the solar heat is insufficient, the condensation heat of the first-stage compression refrigeration system 3 is used to supplement the heat provided by the solar injection refrigeration system 2, and the preheater 202 is activated.

[0048] like Figure 3 As shown, the operating process of the solar jet refrigeration system 2 is similar to the operating process of the solar jet refrigeration system 2 under the condition of sufficient solar energy utilization. The difference is that the high-pressure working fluid pressurized by the refrigerant pump 201 first flows through the preheater 202 for heating and then enters the solar collector 203. At this time, the heat in the preheater 202 is provided by the high-temperature refrigerant at the outlet of the first compressor 301 in the one-stage compression refrigeration system 3.

[0049] The operation process of the one-stage compression refrigeration system 3 is as follows: the first compressor sucks in low-temperature and low-pressure refrigerant, which is compressed into a high-temperature and high-pressure gas. It first enters the preheater 202 through the pipeline and the first solenoid valve 305 to heat the circulating working fluid of the solar injection refrigeration system 2, and then enters the second condenser 302 for condensation. After that, the first economizer 307 is used to supercool the refrigerant into a liquid, and then the pressure is reduced by the fourth expansion valve 304 to become a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant evaporates and absorbs heat in the second evaporator 102, takes away the heat of the air in the air duct, and then flows into the first gas-liquid separator 303 and the first compressor to continue to complete the refrigeration cycle.

[0050] The operating process of the two-stage compression refrigeration system 4 is as follows: the second compressor sucks in low-temperature, low-pressure refrigerant, which is compressed into a high-temperature, high-pressure gas and enters the third condenser 402 through the pipeline and the fourth solenoid valve 406 for condensation. The refrigerant is then supercooled into liquid by the second economizer 407, and then reduced in pressure by the fifth expansion valve 404 to become a low-temperature, low-pressure refrigerant. The low-temperature, low-pressure refrigerant evaporates and absorbs heat in the third evaporator 103, takes away the heat from the air in the air duct, and then flows into the second gas-liquid separator 403 and the second compressor to continue to complete the refrigeration cycle.

[0051] The blower 104 is activated, and the air in the air duct flows through the first evaporator 101, the second evaporator 102 and the third evaporator 103, and is cooled in sequence until the air supply requirement is met, and then the air is sent into the aircraft.

[0052] like Figure 4As shown, the first solenoid valve 305 and the fourth solenoid valve 406 are closed, and the second solenoid valve 306 and the third solenoid valve 405 are opened; if the solar heat is insufficient, the condensation heat of the two-stage compression refrigeration system 4 is used to supplement the heat provided by the solar injection refrigeration system 2, and the preheater 202 is activated.

[0053] The operating process of the solar jet refrigeration system 2 is similar to the operating process of the solar jet refrigeration system 2 under the condition of sufficient solar energy utilization. The difference is that the high-pressure working fluid pressurized by the refrigerant pump 201 first flows through the preheater 202 for heating and then enters the solar collector 203. At this time, the heat in the preheater 202 is provided by the high-temperature refrigerant at the outlet of the second compressor in the two-stage compression refrigeration system 4.

[0054] The operation process of the one-stage compression refrigeration system 3 is as follows: the first compressor sucks in low-temperature and low-pressure refrigerant, which is compressed into a high-temperature and high-pressure gas and enters the second condenser 302 through the pipeline and the second solenoid valve 306 for condensation. The first economizer 307 is then used to supercool the refrigerant into a liquid, and then the pressure is reduced by the fourth expansion valve 304 to become a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant evaporates in the second evaporator 102 and absorbs heat. After taking away the heat of the air in the air duct, it flows into the first gas-liquid separator 303 and the first compressor to continue to complete the refrigeration cycle.

[0055] The operation process of the two-stage compression refrigeration system 4 is as follows: the second compressor inhales low-temperature and low-pressure refrigerant, which is compressed into a high-temperature and high-pressure gas. It first enters the preheater 202 through the pipeline and the third solenoid valve 405 to heat the circulating working fluid of the solar injection refrigeration system 2, and then enters the third condenser 402 for condensation. The refrigerant is then supercooled into liquid by the second economizer 407, and then reduced in pressure by the fifth expansion valve 404 to become a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant evaporates and absorbs heat in the third evaporator 103, takes away the heat of the air in the air duct, and then flows into the second gas-liquid separator 403 and the second compressor to continue to complete the refrigeration cycle.

[0056] The blower 104 is activated, and the air in the air duct flows through the first evaporator 101, the second evaporator 102 and the third evaporator 103, and is cooled in sequence until the air supply requirement is met, and then the air is sent into the aircraft.

[0057] like Figure 5 As shown, under the working conditions where solar energy cannot be used, the principle of the air-conditioning system is described as follows:

[0058] The second solenoid valve 306 and the fourth solenoid valve 406 are closed, and the first solenoid valve 305 and the third solenoid valve 405 are opened; since solar heat cannot be utilized, the solar jet refrigeration system 2 needs to simultaneously utilize the condensation heat of the first-stage compression refrigeration system 3 and the second-stage compression refrigeration system 4 to supplement the heat supply, and the preheater 202 is activated.

[0059] The operating process of the solar jet refrigeration system 2 is similar to the operating process of the solar jet refrigeration system 2 under the condition of sufficient solar energy utilization. The difference is that the high-pressure working fluid pressurized by the refrigerant pump 201 first flows through the preheater 202 for heating and then enters the solar collector 203. At this time, the heat in the preheater 202 is provided by the high-temperature refrigerant at the outlet of the compressor in the first-stage compression refrigeration system 3 and the second-stage compression refrigeration system 4.

[0060] The operation process of the one-stage compression refrigeration system 3 is as follows: the first compressor sucks in low-temperature and low-pressure refrigerant, which is compressed into a high-temperature and high-pressure gas. It first enters the preheater 202 through the pipeline and the first solenoid valve 305 to heat the circulating working fluid of the solar injection refrigeration system 2, and then enters the second condenser 302 for condensation. After that, the first economizer 307 is used to supercool the refrigerant into liquid, and then the fourth expansion valve 304 reduces the pressure to become a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant evaporates in the second evaporator 102 and absorbs heat. After taking away the heat of the air in the air duct, it flows into the first gas-liquid separator 303 and the first compressor to continue to complete the refrigeration cycle.

[0061] The operation process of the two-stage compression refrigeration system 4 is as follows: the second compressor inhales low-temperature and low-pressure refrigerant, which is compressed into a high-temperature and high-pressure gas. It first enters the preheater 202 through the pipeline and the third solenoid valve 405 to heat the circulating working fluid of the solar injection refrigeration system 2, and then enters the third condenser 402 for condensation. The refrigerant is then supercooled into liquid by the second economizer 407, and then reduced in pressure by the fifth expansion valve 404 to become a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant evaporates and absorbs heat in the third evaporator 103, takes away the heat of the air in the air duct, and then flows into the second gas-liquid separator 403 and the second compressor to continue to complete the refrigeration cycle.

[0062] The blower 104 is activated, and the air in the air duct flows through the first evaporator 101, the second evaporator 102 and the third evaporator 103, and is cooled in sequence until the air supply requirement is met, and then the air is sent into the aircraft.

[0063] The parts not involved in the present invention are the same as the existing technology or can be implemented by using the existing technology.

[0064] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A solar-coupled compressor refrigeration system for aircraft with high subcooling characteristics: The air conditioning system comprises a solar jet refrigeration system (2), a first-stage compression refrigeration system (3), a second-stage compression refrigeration system (4) and an air supply system (1) arranged in an air duct; the air supply system (1) comprises: a first evaporator (101), a second evaporator (102), a third evaporator (103) and an air blower (104); the first evaporator (101), the second evaporator (102), the air blower (104) and the third evaporator (103) are arranged in the air duct in sequence; the first evaporator (101) is connected to the solar jet refrigeration system (2); the first-stage compression refrigeration system (3) is connected to the second evaporator (102) and the solar jet refrigeration system (2) respectively; and the second-stage compression refrigeration system (4) is connected to the third evaporator (103) and the solar jet refrigeration system (2) respectively; The solar ejector refrigeration system (2) comprises a refrigerant pump (201), a first condenser (205), an ejector (204), a solar collector (203) and a preheater (202); The output end of the refrigerant pump (201) is connected to the input end of the preheater (202), the output end of the preheater (202) is connected to the input end of the solar collector (203), the output end of the solar collector (203) is connected to the input end of the ejector (204), the output end of the ejector (204) is connected to the input end of the first condenser (205), and the output of the first condenser (205) is divided into two paths, one path is connected to the input end of the refrigerant pump (201), and the other path is further divided into two branches, one branch is connected to the two-stage compression refrigeration system (4) through the third expansion valve (208), and the other branch is further divided into two branches, one branch is connected to the input end of the ejector (204) through the first expansion valve (206), and the other branch is connected to the one-stage compression refrigeration system (3) through the second expansion valve (207).

2. The solar-coupled compressor refrigeration large subcooling aircraft ground air conditioning system according to claim 1, characterized in that: The one-stage compression refrigeration system (3) includes a first compressor (301), a first gas-liquid separator (303), a second condenser (302) and a first economizer (307); The output of the first compressor (301) is divided into two paths, one path is directly connected to the input end of the second condenser (302), and the other path is connected to the input end of the second condenser (302) through the preheater (202). The output end of the second condenser (302) is connected to the input end of the second evaporator (102) after passing through the first economizer (307) and the fourth expansion valve (304) in sequence. The output end of the second evaporator (102) is connected to the input end of the first gas-liquid separator (303), and the output end of the first gas-liquid separator (303) is connected to the input end of the first compressor (301).

3. The solar-coupled compressor refrigeration large subcooling aircraft ground air conditioning system according to claim 2, characterized in that: A first solenoid valve (305) is provided between the first compressor (301) and the preheater (202).

4. The solar-coupled compressor refrigeration large subcooling aircraft ground air conditioning system according to claim 2, characterized in that: A second solenoid valve (306) is provided on a path directly connecting the first compressor (301) and the second condenser (302).

5. The solar-coupled compressor refrigeration large subcooling aircraft ground air conditioning system according to claim 1, characterized in that: The two-stage compression refrigeration system (4) includes a second compressor (401), a third condenser (402), a second gas-liquid separator (403) and a second economizer (407); The output of the second compressor (401) is divided into two paths, one path is directly connected to the input end of the third condenser (402), and the other path is connected to the input end of the third condenser (402) through the preheater (202). The output end of the third condenser (402) is connected to the input end of the third evaporator (103) after passing through the second economizer (407) and the fifth expansion valve (404) in sequence. The output end of the third evaporator (103) is connected to the input end of the second gas-liquid separator (403), and the output end of the second gas-liquid separator (403) is connected to the input end of the second compressor (401).

6. The solar-coupled compressor refrigeration large subcooling aircraft ground air conditioning system according to claim 5, characterized in that: A third solenoid valve (405) is provided between the second compressor (401) and the preheater (202).

7. The solar-coupled compressor refrigeration large subcooling aircraft ground air conditioning system according to claim 5, characterized in that: A fourth solenoid valve (406) is provided on a path directly connecting the second compressor (401) and the third condenser (402).

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