CN113883738B - Novel solar energy sprays-compression refrigerating system - Google Patents
Novel solar energy sprays-compression refrigerating system Download PDFInfo
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/06—Compression machines, plants or systems with non-reversible cycle with compressor of jet type, e.g. using liquid under pressure
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/26—Disposition of valves, e.g. of on-off valves or flow control valves of fluid flow reversing valves
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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Abstract
The invention discloses a novel solar energy injection-compression refrigeration system, which comprises a solar energy injection refrigeration cycle and a vapor compression refrigeration cycle, wherein the vapor compression refrigeration cycle comprises an energy storage device, a gas-liquid separator, a second throttling valve, an evaporator and a compressor; the refrigerant outlet of the condenser is divided into two paths, one path is connected with the generator through a refrigerant circulating pump, and the other path is connected with the inlet of the three-way valve through a first throttling valve; a first outlet of the three-way valve is connected to a first inlet of the gas-liquid separator, and a second outlet of the three-way valve is connected to an inlet of the energy storage device; an outlet of the energy storage device is connected to a second inlet of the gas-liquid separator through a fourth stop valve, and a liquid outlet of the gas-liquid separator is connected to a second throttling valve; the gas outlet of the gas-liquid separator and the outlet of the compressor are both connected to the injection fluid inlet of the ejector through stop valves. The invention can be normally used under different weather conditions to meet the indoor refrigeration requirement, and can obtain more refrigeration capacity under the condition of consuming a small amount of electric energy.
Description
Technical Field
The invention relates to the field of refrigeration systems, in particular to a novel solar injection-compression refrigeration system.
Background
In recent years, the contradiction between economic development and environmental protection and energy consumption is increasingly prominent. And the building energy consumption accounts for about 30% -40% of the whole energy consumption structure. And 1/3 of the building energy consumption is used for indoor environment refrigeration, so that the indoor environment meets the thermal comfort condition. In the traditional refrigeration cycle, the refrigeration core component is a compressor, so that the power consumption is large, the equipment operation noise is large, the maintenance cost is high, and the requirement of energy conservation and emission reduction in the current country is not met. In order to achieve carbon neutralization and carbon peaking, solar jet refrigeration is gradually being spotlighted by the industry. The existing solar injection-compression refrigeration cycle system generally comprises two parts, namely a solar injection refrigeration cycle and a vapor compression refrigeration cycle, wherein solar energy is used as a driving heat source, and an ejector is used for replacing a compressor to be used as a refrigeration core component. However, the existing solar jet-compression refrigeration system is unstable in operation, is easily influenced by weather conditions, and has the advantages of low refrigeration capacity, low operation efficiency and high power consumption.
In the solar-driven pressurized injection refrigeration system provided by the prior patent CN112629066A, a two-phase ejector is additionally arranged in a vapor compression refrigeration system, and the compressor, the vapor ejector and the two-phase ejector share the compression effect of a refrigerant, so that the power consumption is reduced, and the system can be prevented from working abnormally when the solar radiation is insufficient. However, the following problems still exist with such systems: 1. the temperature difference between the stored high-temperature driving heat source and the environment is large, so that heat leakage is caused; 2. compared with the refrigerating capacity generated by the ejector, the high-temperature driving heat source required to be stored is large, so that the heat storage device is large in size and poor in economical efficiency; 3. the injection ratio of the ejector is generally far less than 1, the flow rate of the working fluid of the two-phase ejector is several times of the flow rate of the outlet of the compressor, and the flow rate of the working fluid of the steam ejector is several times of the flow rate of the working fluid of the two-phase ejector, namely the flow rate of the working fluid of the steam ejector is far greater than the flow rate of the compressor and is probably dozens of times, so that the required driving heat is extremely large, when the solar radiation is weak, the driving heat is insufficient or the stored heat is exhausted quickly, the compressor is basically used for operation, the heat energy with less radiation cannot be effectively utilized, and the electricity saving effect is poor.
Disclosure of Invention
In view of the prior art, the invention provides a novel solar injection-compression refrigeration system which can be normally used under different weather conditions to meet the indoor refrigeration requirement and obtain more refrigeration capacity under the condition of consuming a small amount of electric energy.
The invention is realized by the following technical scheme:
a novel solar energy sprays-compresses the refrigeration cycle system, including solar energy sprays the refrigeration cycle and vapor compression refrigeration cycle, the solar energy sprays the refrigeration cycle and includes solar collector, circulating pump, generator, ejector, condenser and refrigerant circulating pump connected sequentially; the steam compression refrigeration cycle comprises an energy storage device, a gas-liquid separator, a second throttling valve, an evaporator and a compressor; the refrigerant outlet of the condenser is divided into two paths, one path is connected with the generator through a refrigerant circulating pump, and the other path is connected with the inlet of the three-way valve through a first throttling valve; a first outlet of the three-way valve is connected to a first inlet of the gas-liquid separator, and a second outlet of the three-way valve is connected to an inlet of the energy storage device; an outlet of the energy storage device is connected to a second inlet of the gas-liquid separator through a fourth stop valve, and a liquid outlet of the gas-liquid separator is connected to the second throttle valve; the outlet of the compressor is connected with the refrigerant inlet of the condenser through a first stop valve; the gas outlet of the gas-liquid separator is connected with the injection fluid inlet of the ejector through a second stop valve; the outlet of the compressor is connected to the motive fluid inlet of the ejector through a third stop valve.
As one preferable aspect of the present invention, the system further includes a controller that controls the turning of the three-way valve, the opening degrees of the first to second throttle valves, and the opening and closing of the first to fourth cut-off valves according to the intensity of sunlight and the degree of consumption of the indoor cooling capacity.
As one preferable scheme of the invention, the energy storage device is used for storing cold energy, and cold storage materials are arranged in the energy storage device.
As one preferable scheme of the invention, the energy storage device comprises a medium channel and heat exchanger fins positioned on two sides of the medium channel, cold storage materials are filled around the heat exchanger fins, and one or more heat conduction additives are added into the cold storage materials.
As one preferable scheme of the present invention, the heat conductive additive is graphite, graphene, iron oxide nanoparticles, or the like.
In a preferred embodiment of the present invention, the ejector includes a mixing chamber and a primary nozzle, and the distance between the primary nozzle and the mixing chamber and the throat cross-sectional area of the primary nozzle are adjustable.
The technical conception of the invention is as follows: the gas-liquid separator is connected with the second outlet of the condenser refrigerant through the throttle valve, the inlet of the three-way valve and the first outlet of the three-way valve, the energy storage device is connected with the second outlet of the condenser refrigerant through the throttle valve, the inlet of the three-way valve and the second outlet of the three-way valve, the refrigerant flow proportion entering the gas-liquid separator and the energy storage device is adjusted by adjusting the opening degree of the valve core of the three-way valve according to meteorological conditions and indoor refrigeration requirements, cold storage is carried out while refrigeration is carried out, and solar energy is fully utilized. When no sunlight irradiates, the phase change material in the energy storage device is liquefied to absorb heat, the refrigerant at the second path outlet of the condenser directly enters the energy storage device to release heat without throttling, the temperature is reduced to realize supercooling, then throttling is carried out to reach the evaporation pressure, and the refrigerating capacity of the system is improved. The two-phase refrigerant enters the gas-liquid separator to realize gas-liquid separation, the saturated liquid refrigerant flows out from the liquid phase outlet of the gas-liquid separator and then is throttled to reach the evaporating pressure, more refrigerating capacity can be obtained, the saturated gaseous refrigerant flows out from the gas phase outlet of the gas-liquid separator and enters the ejector injection fluid inlet, throttling is not needed, throttling loss is reduced, the pressure ratio of fluid at the outlet of the ejector to injection fluid is reduced, the working efficiency of the ejector is improved, the refrigerant flow flowing through the compressor is reduced, and power consumption is reduced. The invention sets a stop valve on the pipeline of the compressor outlet leading to the ejector injection fluid inlet, sets a stop valve on the pipeline of the compressor outlet leading to the condenser refrigerant inlet, and the two stop valves are not opened at the same time. When the solar injection refrigerating capacity is sufficient, the stop valve between the compressor and the ejector injection fluid inlet is opened, the compressor only needs to compress the refrigerant to the intermediate pressure, then the refrigerant enters the ejector and is injected to become high-temperature high-pressure refrigerant steam, so that the solar energy can be effectively utilized, the power consumption of the compressor is reduced, and the consumption of electric energy is reduced. When the solar jet refrigerating capacity is insufficient, a stop valve between a compressor and a condenser refrigerant inlet is opened, the compressor directly compresses the refrigerant into high-temperature and high-pressure refrigerant steam, and normal operation of a refrigerating system is ensured.
Compared with the prior art, the invention has the beneficial effects that:
the system can adjust the opening of the three-way valve, the opening and closing of the first to fourth stop valves and the opening of the first to second throttle valves according to meteorological conditions and indoor refrigeration requirements, corresponding optimal operation modes are provided under different solar radiation intensities, and control parameters are continuously adjustable and accurately matched under the modes 1-4; and the selection of an operation mode and control parameters can be further optimized by taking the comprehensive efficiency in a longer time period as a target, so that the overall energy efficiency is improved.
Compared with the traditional heat/cold storage device, the energy storage and cold storage device in the system has the advantages that the temperature of the stored cold is between the ambient temperature and the evaporation temperature, so the temperature difference with the environment is very small, the heat leakage is small, and the energy efficiency is improved; compared with the conventional method for storing the solar energy driving heat source, the injection cycle COP is lower, the storage capacity is several times of the strategy for storing the cold energy, and the method can reduce the consumption of the heat storage material by several times, and has the advantages of smaller volume and more economy; compared with the method of directly storing the cold energy reaching the evaporation temperature, the method has the advantages that the final refrigerating capacity is not reduced, but the heat leakage loss is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow diagram of a solar injection-compression refrigeration cycle system according to the present invention.
In the figure: 1. the system comprises a solar heat collector, 2. A circulating pump, 3. A generator, 4. An ejector, 5. A condenser, 6. A refrigerant circulating pump, 7. A first throttling valve, 8. A three-way valve, 9-an energy storage device, 10. A gas-liquid separator, 11. A second throttling valve, 12. An evaporator, 13. A compressor, 14. A first stop valve, 15. A second stop valve, 16. A third stop valve, 17. A heat source circulating pump, 18. A fourth stop valve, 19. Iron oxide nanoparticles, 20. A graphene nano plate and 21. A graphene phase change composite material.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
Referring to fig. 1, a novel solar injection-compression refrigeration cycle system includes a solar injection refrigeration cycle and a vapor compression refrigeration cycle. The solar jet refrigeration cycle comprises a solar heat collector 1, a circulating pump 2, a generator 3, an ejector 4, a condenser 5 and a refrigerant circulating pump 6 which are connected in sequence; the steam compression refrigeration cycle comprises an energy storage device 9, a gas-liquid separator 10, a second throttling valve 11, an evaporator 12 and a compressor 13; the refrigerant outlet of the condenser 5 is divided into two paths, one path is connected with the generator 3 through a refrigerant circulating pump 6, and the other path is connected with the inlet of a three-way valve 8 through a first throttling valve 7; a first outlet of the three-way valve 8 is connected to a first inlet of the gas-liquid separator 10, and a second outlet is connected to an inlet of the energy storage device 9; the outlet of the energy storage device 9 is connected to the second inlet of the gas-liquid separator 10 through a fourth stop valve 18, and the liquid outlet of the gas-liquid separator 10 is connected to the second throttle valve 11; an outlet of the compressor 13 is connected to a refrigerant inlet of the condenser 5 through a first shutoff valve 14; the gas outlet of the gas-liquid separator 10 is connected with the injection fluid inlet of the ejector through a second stop valve 15; the outlet of the compressor 13 is connected to the motive fluid inlet of the ejector 4 via a third shut-off valve 16.
In this embodiment, the energy storage device is used for storing cold energy, the cold storage medium is a composite phase change material, and a heat conduction additive may be added to the composite phase change material, where the heat conduction additive may be graphite, graphene, carbon powder, or iron oxide nanoparticles. In this embodiment, the energy storage device 9 includes a medium channel, heat exchanger fins 20 and a graphene composite phase change material 21 that are arranged on both sides of the medium channel, and iron oxide nanoparticles 19 are added to the graphene composite phase change material 21 to ensure the cold storage effect.
In this embodiment, the ejector 4 includes a mixing chamber and a primary nozzle, and the distance between the primary nozzle and the mixing chamber and the throat cross-sectional area of the primary nozzle are both adjustable to satisfy various flow demands.
The system is also provided with a controller, and the controller controls the steering of the three-way valve, the opening degrees of the first throttle valve and the second throttle valve and the opening and closing of the first stop valve, the second stop valve and the fourth stop valve according to the sunlight intensity and the indoor refrigerating capacity consumption degree so as to realize the switching and the operation of different modes.
The system can realize the following operation modes:
the novel solar injection-compression refrigeration cycle system mainly has the following five modes.
Mode 1: the refrigeration-cold storage economic coupling mode is started when the sunlight illumination is strong and the indoor refrigeration amount is consumed little.
Solar energy heating cycle working medium is absorbed by solar collector 1, and cycle working medium flows out from the outlet of solar collector 1 and is pressurized by circulating pump 2, and then enters the first inlet of generator 3, releases heat in generator 3, and then flows out from the first outlet of generator 3 and enters the inlet of solar collector 1. The liquid refrigerant flowing out of the refrigerant outlet of the condenser 5 is divided into two paths, the first path is pressurized by a refrigerant circulating pump 6 and then enters the heated generator 3 to absorb heat to become high-temperature and high-pressure refrigerant steam, and the high-temperature and high-pressure refrigerant steam flows into the working fluid inlet of the ejector 4 to inject the refrigerant from the ejector 4 to inject the fluid inlet; the second part of liquid refrigerant is throttled and decompressed to intermediate pressure by the first throttle valve 7 to become gas-liquid two-phase refrigerant, the liquid refrigerant flows in from the inlet of the three-way valve 8, the valve core of the three-way valve deflects for a certain angle, the first outlet and the second outlet of the three-way valve 8 are both opened, the refrigerant flows out from the first outlet and the second outlet of the three-way valve 8 according to different flow proportions, the refrigerant flowing out from the first outlet of the three-way valve 8 flows into the gas-liquid separator 10 from the first inlet of the gas-liquid separator 10, the refrigerant flowing out from the second outlet of the three-way valve 8 enters the energy storage device 9, the phase-change material in the energy storage device 9 is solidified to release heat and store cold energy, the heat absorption temperature of the refrigerant is increased, and then the refrigerant enters the gas-liquid separator 10 from the second inlet of the gas-liquid separator 10 through the fourth stop valve 18 to be mixed with the gas-liquid two-phase refrigerant entering from the first inlet of the gas-liquid separator 10. Gas-liquid separation of the gas-liquid two-phase refrigerant is realized in the gas-liquid separator 10, the saturated liquid refrigerant flows out from the liquid phase outlet, is throttled and depressurized to evaporation pressure through the second throttle valve 11, enters the evaporator 12 for evaporation refrigeration, then flows out from the refrigerant outlet of the evaporator 12, enters the compressor 13 and is compressed to intermediate pressure, at the moment, the first stop valve 14 is closed, the third stop valve 16 is opened, the refrigerant steam flowing out from the compressor 13 is mixed with the saturated gas refrigerant steam flowing out from the gas phase outlet of the gas-liquid separator 10 through the third stop valve 16, is sucked into the ejector 4 from the ejector 4 injection fluid inlet to be heated and pressurized, then flows out from the ejector 4 outlet to enter the refrigerant inlet of the condenser 5, and the cycle is completed by condensation and heat release.
Mode 2: the refrigeration economy is coupled with the circulation mode, and the refrigeration economy is started when the sunlight is extremely strong but the indoor refrigeration capacity is greatly consumed.
Mode 2 differs from mode 1 in that the spool of the three-way valve 8 is not deflected, the first outlet of the three-way valve 8 is fully open and the second outlet is closed. The refrigerant at the second outlet of the condenser 5 is throttled and depressurized to an intermediate pressure by the first throttle valve 7, and after the refrigerant flows in from the inlet of the three-way valve 8, the refrigerant flows out from the first outlet of the three-way valve 8, enters the first inlet of the gas-liquid separator 10, and then is subjected to gas-liquid separation. In the mode 2 state, the refrigerant does not flow through the energy storage device 9, the system does not store cold energy, and the operation steps of other systems are the same as those in the mode 1.
Mode 3: the refrigeration-cold storage part is in a coupling mode, and is started when sunlight is strong.
The difference between the modes 3 and 1 is that the first stop valve 14 is opened, the third stop valve 16 is closed, and the low-temperature and low-pressure refrigerant vapor flowing out from the refrigerant outlet of the evaporator 12 is compressed by the compressor 13 into high-temperature and high-pressure refrigerant vapor, and then mixed with the refrigerant vapor flowing out from the outlet of the ejector 4, and enters the condenser 5 to condense and release heat, thereby completing the cycle. The system can store cold energy while refrigerating, and other operation steps are the same as the mode 1.
Mode 4: and a refrigeration part is in a coupling mode, and is started when sunlight is weak.
The difference between the mode 4 and the mode 3 is that the valve core of the three-way valve 8 does not deflect, the first outlet of the three-way valve 8 is completely opened, the second outlet is closed, the refrigerant at the second outlet of the condenser 5 is throttled and reduced to the intermediate pressure by the first throttle valve 7, after the refrigerant flows in from the inlet of the three-way valve 8, the refrigerant completely flows out from the first outlet of the three-way valve 8 and enters the first inlet of the gas-liquid separator 10, the refrigerant does not flow through the energy storage device 9, the system does not store cold energy, and the operation steps of other systems are the same as those in the mode 3.
Mode 5: and the super-cooling steam compression mode is started when no sunlight is irradiated.
At this time, the first throttle valve 7 is completely opened and does not play a throttling role, the valve core of the three-way valve 8 is completely deflected, the first outlet of the three-way valve 8 is closed, the second outlet is opened, the liquid refrigerant at the second outlet of the condenser 5 is not throttled by the first throttle valve 7, the liquid refrigerant flows in from the inlet of the three-way valve 8, the liquid refrigerant flows out from the second outlet of the three-way valve 8 and enters the energy storage device 9, the energy storage device 9 releases the stored cold energy at this time, the phase-change material liquefies and absorbs heat, the heat release temperature of the liquid refrigerant is reduced to realize supercooling, then the supercooled liquid refrigerant flows out from the outlet of the energy storage device 9 and enters the gas-liquid separator 10 through the fourth stop valve 18, the second stop valve 15 is closed, the supercooled liquid refrigerant flows out from the liquid outlet of the gas-liquid separator 10, the supercooling refrigerant is throttled to the evaporation pressure through the second throttle valve 11 and then enters the evaporator 12 for refrigeration, the refrigerant flows out from the refrigerant outlet of the evaporator 12 after the refrigeration and enters the compressor to be compressed into high-temperature and high-pressure refrigerant steam, at this time, the first stop valve 14 is opened, the third stop valve 16 is closed, and the high-temperature refrigerant steam of the high-temperature refrigerant steam is condensed and enters the condenser 5 to complete the heat release cycle.
In conclusion, after the novel solar jet compression refrigeration system operates for a period of time, the required heat energy and electric energy are obviously smaller than those of the conventional solar jet compression refrigeration system, and the novel solar jet compression refrigeration system has the advantages of stable operation, high refrigerating capacity, capability of being used under different weather conditions, capability of meeting indoor refrigeration requirements and good energy-saving effect.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope of the present invention.
Claims (6)
1. The utility model provides a novel solar energy sprays-compression refrigerating system, includes solar energy and sprays refrigeration cycle and vapor compression refrigeration cycle, its characterized in that:
the solar jet refrigeration cycle comprises a solar heat collector (1), a circulating pump (2), a generator (3), an ejector (4), a condenser (5) and a refrigerant circulating pump (6) which are connected in sequence;
the steam compression refrigeration cycle comprises an energy storage device (9), a gas-liquid separator (10), a second throttling valve (11), an evaporator (12) and a compressor (13);
the refrigerant outlet of the condenser (5) is divided into two paths, one path is connected with the generator (3) through a refrigerant circulating pump (6), and the other path is connected with the inlet of a three-way valve (8) through a first throttling valve (7); a first outlet of the three-way valve (8) is connected to a first inlet of the gas-liquid separator (10), and a second outlet of the three-way valve is connected to an inlet of the energy storage device (9); an outlet of the energy storage device (9) is connected to a second inlet of the gas-liquid separator (10) through a fourth stop valve (18), and a liquid outlet of the gas-liquid separator (10) is connected to the second throttle valve (11);
an outlet of the compressor (13) is connected with a refrigerant inlet of the condenser (5) through a first stop valve (14); the gas outlet of the gas-liquid separator (10) is connected with the injection fluid inlet of the ejector through a second stop valve (15); the outlet of the compressor (13) is connected to the injection fluid inlet of the ejector (4) through a third stop valve (16);
the system comprises the following 5 operation modes:
mode 1: a refrigeration-storage economic coupling mode in which: a first outlet and a second outlet of the three-way valve (8) are both opened, the first stop valve (14) is closed, the second stop valve (15) is opened, the third stop valve (16) is opened, refrigerant steam flowing out of the compressor (13) is mixed with saturated gaseous refrigerant steam flowing out of a gas-liquid separator (10) gas-phase outlet through the third stop valve (16), and is sucked into the ejector (4) from an injection fluid inlet of the ejector (4) for temperature and pressure rise;
mode 2: a refrigeration economy coupling mode in which a first outlet of the three-way valve (8) is fully open and a second outlet is closed; other operation steps are the same as the mode 1;
mode 3: in the refrigeration-heat storage economic coupling mode, a first stop valve (14) is opened, a third stop valve (16) is closed, low-temperature low-pressure refrigerant steam flowing out of a refrigerant outlet of an evaporator (12) is compressed into high-temperature high-pressure refrigerant steam by a compressor (13), then is mixed with the refrigerant steam flowing out of an outlet of an ejector (4), and enters a condenser (5) to condense and release heat to complete a cycle; other operation steps are the same as the mode 1;
mode 4: a refrigeration section coupling mode in which: a first outlet of the three-way valve (8) is completely opened, a second outlet is closed, and other operation steps are the same as those in the mode 3;
mode 5: super-cooled steam compression mode in which: the first throttle valve (7) is fully opened, a first outlet of the three-way valve (8) is closed, and a second outlet is opened; the second stop valve (15) is closed, the first stop valve (14) is opened, and the third stop valve (16) is closed; the supercooled liquid refrigerant flows out of a liquid phase outlet of the gas-liquid separator (10), is throttled and depressurized to evaporation pressure through the second throttle valve (11), then enters the evaporator (12) for refrigeration, flows out of a refrigerant outlet of the evaporator (12) after refrigeration is completed, enters the compressor to be compressed into high-temperature and high-pressure refrigerant steam, and the high-temperature and high-pressure refrigerant steam enters the condenser (5) through the first stop valve (14) to be condensed and release heat to complete circulation.
2. The novel solar injection-compression refrigeration system as set forth in claim 1, wherein:
the solar air conditioner further comprises a controller, wherein the controller controls the steering of the three-way valve, the opening degrees of the first throttle valve and the second throttle valve and the opening and closing of the first stop valve, the second stop valve and the fourth stop valve according to the sunlight intensity and the indoor refrigerating capacity consumption degree.
3. The novel solar ejector-compression refrigeration system of claim 2, wherein:
the energy storage device is used for storing cold energy, and cold storage materials are arranged in the energy storage device.
4. The novel solar ejector-compression refrigeration system of claim 3, wherein:
the energy storage device comprises a medium channel and heat exchanger fins positioned on two sides of the medium channel, cold storage materials are filled around the heat exchanger fins, and one or more heat conduction additives are added into the cold storage materials.
5. The novel solar ejector-compression refrigeration system of claim 4, wherein:
the heat conduction additive is any one of graphite, graphene and iron oxide nanoparticles.
6. The novel solar injection-compression refrigeration system as set forth in claim 2, wherein:
the ejector comprises a mixing chamber and a primary nozzle, and the distance between the primary nozzle and the mixing chamber and the throat section area of the primary nozzle are both adjustable.
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| CN115046328A (en) * | 2022-06-01 | 2022-09-13 | 嵊州市浙江工业大学创新研究院 | Injection compression refrigeration system adopting phase-change material to recycle waste heat of cement plant |
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