CN114791179A - Solar waste heat driven jet refrigeration coupling system and method - Google Patents
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- CN114791179A CN114791179A CN202210390386.6A CN202210390386A CN114791179A CN 114791179 A CN114791179 A CN 114791179A CN 202210390386 A CN202210390386 A CN 202210390386A CN 114791179 A CN114791179 A CN 114791179A
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 27
- 239000002918 waste heat Substances 0.000 title claims abstract description 22
- 238000010168 coupling process Methods 0.000 title claims abstract description 21
- 230000008878 coupling Effects 0.000 title claims abstract description 18
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000003507 refrigerant Substances 0.000 claims abstract description 80
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 239000012530 fluid Substances 0.000 claims abstract description 51
- 238000007906 compression Methods 0.000 claims abstract description 29
- 230000006835 compression Effects 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000005855 radiation Effects 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 12
- 229920006395 saturated elastomer Polymers 0.000 claims description 12
- 239000011555 saturated liquid Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
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- 230000007423 decrease Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B19/00—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour
- F25B19/02—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour using fluid jet, e.g. of steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
- F25B27/005—Machines, plants or systems, using particular sources of energy using solar energy in compression type systems
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Abstract
The invention discloses a solar waste heat driven jet refrigeration coupling system and a method, wherein the system comprises a solar heat collection generation sub-cycle and a jet compression sub-cycle, and water for absorbing solar radiation and a refrigerant in a generator exchange heat in a circulating manner; the liquid refrigerant absorbs heat in the generator and is vaporized into high-temperature and high-pressure refrigerant, the high-temperature and high-pressure refrigerant is used as primary fluid to enter the ejector, secondary fluid mixed with the refrigerant in the compressor is ejected and mixed in the ejector to be boosted. The system is superior to common solar jet refrigeration systems and compression refrigeration systems in that the power consumption of the compressor is reduced and the refrigeration performance of the system is effectively improved by mixing partial refrigerant discharged in the compression process of the compressor with gaseous refrigerant in the gas-liquid separator and then entering the ejector.
Description
Technical Field
The invention belongs to the field of new energy waste heat utilization, and particularly relates to a novel solar waste heat driven jet refrigeration coupling system and method.
Background
Since nearly half a century, the industry of China has been greatly developed, the national economic level is remarkably improved, on one hand, the demand of China for energy is continuously increased, on the other hand, the energy is increasingly tense, and the problem of environmental pollution is increasingly highlighted, so that energy transformation, energy conservation and emission reduction become the focus of attention and research of various industries, and are particularly emphasized in the building industry. In China, the building energy consumption brought by unit areas of windows, outer walls and roofs is 2-3 times, 3-5 times and 3-5 times of those of developed countries respectively, the actual use energy consumption of air conditioners and the heating energy consumption of buildings in winter are generally higher than those of the developed countries, the average value of coal and water resources in China is 1/2 of the average level in the world, and the average value of petroleum and natural gas is only 4.1 of the average level in the world. The higher energy consumption and the lower energy utilization rate bring heavy pressure to the energy supply of China.
Research and development of refrigeration air-conditioning systems and devices driven by renewable energy or low-grade heat energy are one of important directions for development of refrigeration air-conditioning industry, and are also important measures for adapting to national strategies for energy conservation, emission reduction and low-carbon development.
The vast breadth of China has abundant solar energy resources, and the solar energy is an inexhaustible natural resource and has the characteristics of cleanness and low price, so that the solar energy is widely used in a refrigerating system, including photoelectric conversion, namely, the solar energy is converted into electric energy to drive a conventional compression refrigerating system; the solar jet type refrigerating system has the advantages that the system structure is simple, the operation is reliable, the complexity of the system is not increased while the system efficiency is improved, and the refrigerating capacity of the system is highly matched with the solar radiation intensity, so that the development potential is high.
The ejector is a device which utilizes two fluids with different states to mix to generate intermediate-pressure fluid so as to complete energy exchange and mass transfer. Because the ejector has the characteristics of simple structure, stable operation and no moving part, the ejector can be widely applied to a plurality of fields such as pharmacy, chemical industry, energy and the like. At present, when the condensing temperature is reduced or the evaporating temperature is increased, the external pressure ratio of the compressor is reduced, and for a fixed compressor, the internal pressure ratio is constant, and the over-compression condition of the compressor occurs when the external pressure ratio is smaller than the internal pressure ratio, so that the efficiency of the compressor is reduced, and the overall performance of the system is reduced.
In view of the above, it is desirable to provide a refrigeration system and method with injection and compression coupled, which fully utilize the solar energy waste heat, reduce the power consumption of compression, and improve the system performance.
Disclosure of Invention
In order to solve the above defects in the prior art, the present invention aims to provide a solar energy waste heat driven injection refrigeration coupling system. Because the refrigerating system of injection and compression coupling of current solar energy waste heat drive, the compression is consumed power greatly, and because the internal pressure ratio is certain to fixed compressor, the compressor condition of overcompression appears when the external pressure ratio is less than the internal pressure ratio, has reduced the efficiency of compressor, makes the system wholeness ability decline. In order to solve the problem, the invention provides a novel solar waste heat driven jet refrigeration coupling system, and partial refrigerant discharged in the compression process of a compressor is mixed with gaseous refrigerant in a gas-liquid separator and then enters an ejector, so that the power consumption of the compressor is reduced, and the system performance is improved.
The invention is realized by the following technical scheme.
On one hand, the invention provides a solar waste heat driven injection refrigeration coupling system, which comprises a solar heat collection generation sub-cycle and an injection compression sub-cycle;
the solar heat collection generation sub-cycle comprises a circulation loop formed by a generator, a water pump and a solar heat collector; the water absorbing the solar radiation exchanges heat with the refrigerant in the generator in a circulating way;
the injection compression sub-cycle comprises a first injection compression sub-cycle loop formed by a generator, an injector and a condenser which are communicated with the generator; the ejector and the condenser are respectively communicated with the evaporator, the compressor to the condenser and the ejector through a gas-liquid separator to form a second injection compression sub-circulation loop;
the liquid refrigerant absorbs heat in the generator and is vaporized into high-temperature and high-pressure refrigerant, the high-temperature and high-pressure refrigerant is used as primary fluid to enter the ejector, and secondary fluid mixed with the refrigerant in the compressor is ejected and mixed in the ejector to increase pressure.
The invention is further improved in that the gas-liquid two-phase mixture in the gas-liquid separator is separated into saturated gas refrigerant and saturated liquid refrigerant, which are respectively discharged from the upper and lower pipelines in the gas-liquid separator.
The invention is further improved in that the upper pipeline of the gas-liquid separator and the pipeline of the compressor through the regulating valve are communicated with the ejector together.
The invention is further improved in that the lower pipeline of the gas-liquid separator is communicated with the compressor through a second throttling valve and an evaporator.
The invention is further improved in that the outlet pipeline of the ejector is communicated with the compressor, then communicated with the condenser and communicated with the generator through the working medium pump.
The invention is further improved in that the outlet of the condenser is connected with the gas-liquid separator through a first throttling valve.
The invention is further improved in that the ejector comprises a nozzle, a suction chamber, a mixing chamber and a pressure expansion chamber, wherein the mixing chamber is an equal-diameter section, and the suction chamber and the pressure expansion chamber are positioned at two ends of the mixing chamber and are diameter expansion sections; one end of the nozzle is communicated with the outlet of the generator, and the other end of the nozzle extends into the throat part of the suction chamber, and the side wall of the suction chamber is connected with the gas-liquid separator; the tail part of the pressure expansion chamber is an ejector outlet.
In another aspect of the invention, a solar waste heat driven jet refrigeration coupling method of the system is provided, wherein water absorbs solar radiation heat in a solar heat collector, enters a generator after being heated up, exchanges heat with a refrigerant, and returns to the solar heat collector;
the liquid refrigerant absorbs heat in the generator and is vaporized into high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant is used as primary fluid to enter the ejector;
the saturated gaseous refrigerant from the gas-liquid separator and the refrigerant discharged from the compressor are mixed into a secondary fluid of the ejector and are injected, and the two fluids are mixed in the ejector and are pressurized;
saturated liquid refrigerant from the gas-liquid separator flows into the evaporator after adiabatic throttling to absorb heat and then returns to the compressor;
the refrigerant at the outlet of the ejector is mixed with the gaseous refrigerant at the outlet of the compressor, the mixture enters the condenser to be condensed and release heat, and a part of the refrigerant returns to the generator after being boosted by the working medium pump; the other part of the refrigerant at the outlet of the condenser is in a wet steam state after heat insulation throttling and is sent into a gas-liquid separator for gas-liquid separation.
The invention is further improved in that the high-pressure primary fluid ejected from the ejector enters the suction chamber of the ejector, the suction area generates vacuum to eject the secondary fluid, the two fluids are mixed in the mixing chamber, and the pressure at the outlet of the ejector in the diffusion chamber is higher than the pressure of the secondary fluid entering the suction chamber.
Compared with the prior art, the invention has the following beneficial effects:
in the existing injection-compression coupled refrigerating system, when the condensing temperature is reduced or the evaporating temperature is increased, the external pressure ratio of the compressor is reduced, and for a fixed compressor, because the internal pressure ratio is constant, the compressor has an over-compression condition when the external pressure ratio is smaller than the internal pressure ratio, so that the efficiency of the compressor is reduced, and the overall performance of the system is reduced. In order to improve the utilization rate of solar energy and improve the over-compression condition of a compressor, the invention provides a solar energy waste heat driven injection and intermediate exhaust compression coupling refrigerating system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
fig. 1 is a schematic diagram of a solar waste heat driven injection refrigeration coupling system according to an embodiment of the present invention;
fig. 2 is a simplified model schematic diagram of injection refrigeration according to an embodiment of the present invention.
1. A generator; 2. a water pump; 3. a solar heat collector; 4. an ejector; 401. a primary fluid inlet; 402. a secondary fluid inlet; 403. a nozzle; 404. a throat; 405. a suction chamber; 406. a mixing chamber; 407. a pressure expansion chamber; 408. shock wave points; 409. an injector outlet; 5. a condenser; 6. a first throttle valve; 7. a gas-liquid separator; 8. a second throttle valve; 9. an evaporator; 10. a compressor; 11. adjusting a valve; 12. a working medium pump.
Detailed Description
The invention will be described in detail with reference to the drawings and specific embodiments, which are provided herein for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Referring to fig. 1, fig. 1 shows a solar waste heat driven injection refrigeration coupling system according to an embodiment of the present invention, which includes a solar heat collection generation sub-cycle and an injection compression sub-cycle. The solar heat collection generation sub-cycle comprises a circulation loop formed by a generator 1, a water pump 2 and a solar heat collector 3; wherein, after the temperature of the water is increased by absorbing the heat of solar radiation in the solar heat collector 3, the water enters the generator 1 to exchange heat with the refrigerant and then returns to the solar heat collector 3 under the action of the water pump 2.
The injection compression sub-cycle comprises a first injection compression sub-cycle loop formed by communicating a generator 1, an injector 4, a condenser 5 and a working medium pump 12 with the generator 1; the outlet pipeline of the ejector 4 is communicated with a compressor 10, and then communicated with a condenser 5, and communicated with the generator 1 through a working medium pump 12. The other path is formed by connecting an ejector 4, a condenser 5 and a first throttle valve 6 with a second throttle valve 8, an evaporator 9 and a compressor 10 to the condenser 5 through a pipeline at the lower part of a gas-liquid separator 7, and a pipeline at the upper part of the separator 7 is directly connected with the ejector 4 to form a second injection compression sub-circulation loop.
The gas-liquid two-phase mixture in the gas-liquid separator 7 is separated into a saturated gas refrigerant and a saturated liquid refrigerant, and the saturated gas refrigerant and the saturated liquid refrigerant are discharged from the upper and lower pipes in the gas-liquid separator, respectively. The upper pipeline of the gas-liquid separator 7 and the compressor 10 are communicated to the ejector 4 together through the pipeline of the regulating valve 11; the lower pipeline of the gas-liquid separator 7 is communicated to a compressor 10 through a second throttle valve 8 and an evaporator 9.
In the injection compression sub-cycle, liquid refrigerant absorbs heat in the generator 1 and is vaporized into high-temperature and high-pressure refrigerant, the high-temperature and high-pressure refrigerant is used as primary fluid to enter the ejector 4 to inject secondary fluid of the ejector, the two fluids are mixed in the ejector to increase pressure, then are mixed with gaseous refrigerant at the outlet of the compressor 10, and enter the condenser 5 to be condensed and release heat; one part of refrigerant is boosted by the working medium pump 12 and then returns to the generator 1, the other part of refrigerant enters the gas-liquid separator 7 in a wet steam state after being subjected to adiabatic throttling in the first throttling valve 6, and the saturated gaseous refrigerant from the gas-liquid separator 7 is mixed with the refrigerant discharged from the middle of the compressor 10 and then is injected as secondary fluid of the ejector; the saturated liquid refrigerant from the gas-liquid separator 7 flows into the evaporator 9 after being adiabatically throttled by the second throttle valve 8, and returns to the compressor 10 after absorbing external heat, thereby completing the whole cycle.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating an injection refrigeration structure according to an embodiment of the present invention. The ejector is a device which utilizes two fluids with different states to mix to generate intermediate pressure fluid so as to complete energy exchange and mass transfer. The ejector has the characteristics of simple structure, stable operation and no moving part. The ejector comprises four parts, a nozzle 403, a suction chamber 405, a mixing chamber 406 and a diffuser chamber 407; the mixing chamber 406 is a constant diameter section, the suction chamber 405 and the diffusion chamber 407 are positioned at two ends of the mixing chamber 406 and are diameter-expanding sections, the primary fluid inlet 401 at one end of the nozzle 403 is communicated with the generator outlet, one end of the nozzle extends into the throat 404 of the suction chamber 405, and the side wall of the suction chamber 405 is provided with a secondary fluid inlet 402 connected with the gas-liquid separator 7; in the middle of the mixing chamber 406 is a shock point 408; the diffuser chamber 407 terminates in an ejector outlet 409.
The invention provides a solar energy waste heat driven jet refrigeration coupling method, which comprises the following steps:
the water absorbs solar radiation heat in the solar heat collector, is heated, enters the generator to exchange heat with the refrigerant, and then returns to the solar heat collector; the liquid refrigerant absorbs heat in the generator and is vaporized into high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant enters the ejector as primary fluid.
Another part of the refrigerant at the outlet of the condenser 5 is adiabatically throttled in the first throttle valve 6, and then is in a wet vapor state, and is sent to a gas-liquid separator 7 for gas-liquid separation.
The gas-liquid separator is used for separating a gas-liquid two-phase mixture into a saturated gas refrigerant and a saturated liquid refrigerant, and the separation principle is that the saturated gas refrigerant is discharged from an upper pipeline of the gas-liquid separator and the saturated liquid refrigerant is discharged from a lower pipeline of the gas-liquid separator by utilizing the difference of gas and liquid densities.
The saturated gaseous refrigerant from the gas-liquid separator and the refrigerant discharged from the compressor are mixed into a secondary fluid of the ejector and are injected, and the two fluids are mixed in the ejector and are pressurized;
the saturated liquid refrigerant from the gas-liquid separator flows into the evaporator 9 after being subjected to adiabatic throttling by the second throttling valve 8, and returns to the compressor after absorbing external heat, thereby completing the whole cycle.
The refrigerant at the outlet of the ejector is mixed with the gaseous refrigerant at the outlet of the compressor, the mixture enters the condenser to be condensed and release heat, and a part of the refrigerant returns to the generator after being boosted by the working medium pump; the other part of the refrigerant at the outlet of the condenser is subjected to adiabatic throttling, then is in a wet steam state and is sent into a gas-liquid separator for gas-liquid separation.
When the ejector works, high-pressure primary fluid ejected from a nozzle 403 through a primary fluid inlet 401 enters a suction chamber 405 of the ejector, pressure energy is converted into velocity energy due to the extremely high flow rate of the ejected fluid, the pressure in a suction area is reduced to generate vacuum, secondary fluid is ejected, the two fluids exchange energy in a mixing chamber 406, the two fluids are fully mixed and then enter a pressure expansion chamber 407, kinetic energy of the two fluids is gradually converted into pressure energy in the pressure expansion chamber, and finally the pressure of an outlet 409 of the ejector is higher than the pressure of the secondary fluid entering the suction chamber, so that the effect of improving the pressure of the secondary fluid is achieved.
The process of the primary fluid from the nozzle inlet to the throat is an isentropic process, i.e.:
wherein h is p,0 And h t Specific enthalpy, v, of primary fluid at the inlet and throat of the ejector, respectively t Is the velocity of the primary fluid in the throat of the nozzle, m/s.
In the ejector model, isentropic efficiency is typically used to measure the energy loss in the ejector, since isentropic efficiency is different for different refrigerants.
The compressor adopts a scroll compressor with middle exhaust, and consists of a movable scroll disk, a fixed scroll disk, an air suction hole, a middle exhaust hole and an exhaust hole. Two scroll disks with the same scroll profile parameters, the distance between the centers of two base circles being r (the value of r is related to the involute pitch and the wall thickness), but the phase difference being pi are respectively a movable scroll disk and a fixed scroll disk, and after the two scroll disks are assembled, a plurality of pairs of crescent closed volume cavities can be formed.
The gas after the first stage of the compressor is compressed and compressed is higher than the pressure of the saturated gaseous refrigerant in the gas-liquid separator, so that part of the gas is discharged from the middle exhaust hole of the compressor under the action of the pressure difference, is mixed with the refrigerant gas in the gas-liquid separator and then enters the ejector as the secondary fluid of the ejector. In the middle exhaust process of the compressor, the rotation angle of the main shaft is continuously increased, the compression process is still continued, and because the pressure in the compressor is always higher than the external pressure in the process, the gas in the compressor is continuously discharged outwards in the process.
When the condensing temperature is lowered or the evaporating temperature is raised, the external pressure ratio of the compressor is reduced, and the method of the invention overcomes the over-compression condition of the fixed compressor when the external pressure ratio is smaller than the internal pressure ratio due to the constant internal pressure ratio, improves the efficiency of the compressor and improves the overall performance of the system.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (10)
1. A solar energy waste heat driven injection refrigeration coupling system is characterized by comprising a solar energy heat collection generation sub-cycle and an injection compression sub-cycle;
the solar heat collection generation sub-cycle comprises a circulation loop formed by a generator (1), a water pump (2) and a solar heat collector (3); the water absorbing the solar radiation exchanges heat with the refrigerant in the generator in a circulating way;
the injection compression sub-cycle comprises a first injection compression sub-cycle loop formed by communicating a generator (1), an injector (4) and a condenser (5) with the generator (1); and a second injection compression sub-circulation loop which is formed by respectively communicating the ejector (4) with the condenser (5) through a gas-liquid separator (7) and communicating the evaporator (9) with the compressor (10) to the condenser (5) and the ejector (4);
the liquid refrigerant absorbs heat in the generator and is vaporized into high-temperature and high-pressure refrigerant, the high-temperature and high-pressure refrigerant is used as primary fluid to enter the ejector, secondary fluid mixed with the refrigerant in the compressor is ejected and mixed in the ejector to be boosted.
2. The solar waste heat driven jet refrigeration coupling system as claimed in claim 1, wherein the gas-liquid two-phase mixture in the gas-liquid separator (7) is separated into a saturated gas refrigerant and a saturated liquid refrigerant, and the saturated gas refrigerant and the saturated liquid refrigerant are respectively discharged from an upper pipeline and a lower pipeline in the gas-liquid separator.
3. The solar afterheat-driven jet refrigeration coupling system as claimed in claim 2, wherein the upper pipeline of the gas-liquid separator (7) and the compressor (10) are communicated with the ejector (4) through the pipeline of the regulating valve (11).
4. The solar waste heat driven jet refrigeration coupling system as claimed in claim 2, wherein the lower pipeline of the gas-liquid separator (7) is communicated to the compressor (10) through a second throttle valve (8) and an evaporator (9).
5. The solar waste heat driven jet refrigeration coupling system as claimed in claim 1, wherein an outlet pipeline of the jet device (4) is communicated with a compressor (10), then communicated with a condenser (5) and communicated with the generator (1) through a working medium pump (12).
6. A solar waste heat driven jet refrigeration coupling system according to claim 1, characterized in that the outlet of the condenser (5) is connected with the gas-liquid separator (7) through the first throttle valve (6).
7. The solar waste heat driven jet refrigeration coupling system as claimed in claim 1, wherein the ejector comprises a nozzle (403), a suction chamber (405), a mixing chamber (406) and a diffuser chamber (407), the mixing chamber (406) is a constant diameter section, and the suction chamber (405) and the diffuser chamber (407) are located at two ends of the mixing chamber (406) and are diameter-expanded sections; one end of the nozzle (403) is communicated with the outlet of the generator, and the other end of the nozzle extends into the throat part (404) of the suction chamber (405), and the side wall of the suction chamber (405) is connected with the gas-liquid separator (7); the diffuser chamber (407) terminates in an ejector outlet (409).
8. A solar waste heat driven injection refrigeration coupling method based on the system of any one of claims 1 to 7, which is characterized by comprising the following steps: .
The water absorbs solar radiation heat in the solar heat collector, is heated, enters the generator to exchange heat with the refrigerant, and then returns to the solar heat collector;
the liquid refrigerant absorbs heat in the generator and is vaporized into high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant is used as primary fluid to enter the ejector;
the saturated gaseous refrigerant from the gas-liquid separator and the refrigerant discharged from the compressor are mixed into a secondary fluid of the ejector and are injected, and the two fluids are mixed in the ejector and are pressurized;
the saturated liquid refrigerant from the gas-liquid separator flows into the evaporator after heat insulation throttling to absorb heat and then returns to the compressor;
the refrigerant at the outlet of the ejector is mixed with the gaseous refrigerant at the outlet of the compressor, the mixture enters the condenser to be condensed and release heat, and a part of the refrigerant returns to the generator after being boosted by the working medium pump; the other part of the refrigerant at the outlet of the condenser is in a wet steam state after heat insulation throttling and is sent into a gas-liquid separator for gas-liquid separation.
9. The system of claim 8, wherein the high pressure primary fluid from the ejector enters the suction chamber of the ejector, the suction area creates a vacuum to draw the secondary fluid, the two fluids are mixed in the mixing chamber, and the pressure at the outlet of the ejector in the diffusion chamber is higher than the pressure of the secondary fluid entering the suction chamber.
10. The system of claim 9, wherein the process of the primary fluid from the nozzle inlet to the throat is an isentropic process, that is:
wherein h is p,0 And h t Specific enthalpy, v, of primary fluid at the inlet and throat of the ejector, respectively t Is the velocity of the primary fluid at the throat of the nozzle.
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| CN113531950A (en) * | 2021-07-14 | 2021-10-22 | 太原理工大学 | Solar energy sprays and middle exhaust compression coupling refrigerating plant |
| CN114251865A (en) * | 2022-01-06 | 2022-03-29 | 西安交通大学 | Cold and hot combined supply injection circulation system and working method thereof |
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| JP2002081788A (en) * | 2000-09-05 | 2002-03-22 | Tokyo Gas Co Ltd | Refrigeration cycle system |
| CN203396149U (en) * | 2013-06-06 | 2014-01-15 | 昆明理工大学 | Solar two-stage ejection type refrigerating system with heat regenerator |
| FR3049338A1 (en) * | 2016-03-23 | 2017-09-29 | Univ Shanghai Ocean | SELF-CASCADE AND EJECTION REFRIGERATION DEVICE FOR LOST HEAT RECOVERY OF CANBOR THRU |
| CN113531950A (en) * | 2021-07-14 | 2021-10-22 | 太原理工大学 | Solar energy sprays and middle exhaust compression coupling refrigerating plant |
| CN114251865A (en) * | 2022-01-06 | 2022-03-29 | 西安交通大学 | Cold and hot combined supply injection circulation system and working method thereof |
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Application publication date: 20220726 |