CN110500824A - A kind of non-azeotropic working medium supercharging mechanical supercooling CO2Transcritical cooling system - Google Patents
A kind of non-azeotropic working medium supercharging mechanical supercooling CO2Transcritical cooling system Download PDFInfo
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- CN110500824A CN110500824A CN201910834735.7A CN201910834735A CN110500824A CN 110500824 A CN110500824 A CN 110500824A CN 201910834735 A CN201910834735 A CN 201910834735A CN 110500824 A CN110500824 A CN 110500824A
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- 238000001816 cooling Methods 0.000 title claims abstract description 57
- 238000004781 supercooling Methods 0.000 title claims abstract description 34
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 238000005057 refrigeration Methods 0.000 claims abstract description 20
- 239000003507 refrigerant Substances 0.000 claims description 23
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 21
- 230000002427 irreversible effect Effects 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 description 12
- 238000001704 evaporation Methods 0.000 description 11
- 230000008020 evaporation Effects 0.000 description 9
- 235000009508 confectionery Nutrition 0.000 description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000000505 pernicious effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- 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
- F25B41/22—Disposition of valves, e.g. of on-off valves or flow control valves between evaporator and compressor
-
- 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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
-
- 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
- F25B43/006—Accumulators
-
- 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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/10—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point with several cooling stages
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a kind of non-azeotropic working medium supercharging mechanicals, and CO is subcooled2Transcritical cooling system.CO of the invention2Trans-critical cycle cooling cycle system includes gas cooler, medium temperature grade cooling evaporator, low-temperature level cooling evaporator, throttle valve, evaporator, compressor；The non-azeotropic working medium supercharging mechanical supercooling circulatory system includes medium temperature grade compressor, condenser, high-temperature level throttle valve, liquid storage device, medium temperature grade throttle valve, by-passing valve, low-temperature level throttle valve, low-temperature level compressor.The present invention assisted SAPMAC method by non-azeotropic working medium supercharging mechanical, heat exchange is set to form more good Temperature Matching, it reduces heat transfer temperature difference, reduce the irreversible loss of heat transfer process, and then reduce the heat transfer irreversible loss of condenser and evaporator, be improved the efficiency of refrigeration cycle.
Description
Technical field
The present invention relates to refrigeration technology fields, and CO is subcooled more particularly to a kind of non-azeotropic working medium supercharging mechanical2Trans-critical cycle
Refrigeration system.
Background technique
As global warming, ozone layer such as are destroyed at the getting worse for environmental problems, for air-conditioning and refrigeration industry, most
Important research topic is to find new environmentally friendly natural refrigerants, and substitution has destruction to ozone layer and can generate
The working medium such as CFCs, HCFCs of greenhouse effects.CO2As refrigerant, due to its is nontoxic, abundance, with plain oil phase
Molten, the advantages that refrigerating effect per unit swept volume is big, more and more attention has been paid to.
But due to CO2Lower critical-temperature and higher critical pressure, cause refrigerating efficiency lower, especially work as environment
When temperature is higher, CO2Refrigerating capacity sharply decline, and power consumption increase.If to the CO of gas cooler outlet2Fluid carries out
Supercooling, with the increase of degree of supercooling, restriction loss is reduced, and circulation cooling capacity increases, and then can promote circulation COP.It is steamed by auxiliary
Vapour pressure contraction SAPMAC method, to CO2The CO of Trans-critical cycle refrigeration cycle gas cooler outlet2It carries out cooling method and is known as mechanical mistake
It is cold.Mechanical super cooling can not only increase refrigerating capacity, and can reduce the operation high pressure of major cycle, reduce compressor air-discharging pressure
Power extends the service life of compressor.
When mechanical super cooling circulation using pure refrigerant as refrigerant when, evaporative phase-change process temperature remains unchanged, but across facing
Boundary CO2Fluid cooling procedure is temperature-fall period, and the two heat transfer process temperature mismatches, and causes heat transfer process irreversible loss big.
And, evaporating temperature lower application higher for environment temperature, such as freezer, CO2Degree of supercooling is up to 20 DEG C or more.It is mechanical
Supercooling refrigeration cycle condensation side exchanges heat with air, evaporation side and CO2Fluid exchanges heat, and the temperature rise of air side does not surpass generally
Cross 8 DEG C, and CO2Temperature drop be 20 DEG C or so, and non-azeotropic working medium evaporation and the slip temperature of condensation process are not much different, and such as adopt
It is subcooled with conventional non-azeotropic working medium refrigeration cycle single-stage, air side and CO cannot be met simultaneously2The Temperature Matching of fluid side, thus
It can cause biggish irreversible loss again.
Therefore, the condensation and evaporation process point for improving with while realizing mechanical super cooling circulation need to be recycled to mechanical super cooling
Not with air and CO2Fluid forms good Temperature Matching, and then reduces the whole irreversible loss of circulation to the greatest extent, from
And lifting system entirety efficiency.
Summary of the invention
Present invention aims at, overcome above-mentioned the deficiencies in the prior art, and a kind of non-azeotropic working medium pressurization is provided
Mechanical super cooling CO2Trans-critical cycle cooling cycle system,
The present invention is by mechanical super cooling cooling cycle system and CO2Trans-critical cycle cooling cycle system forms, wherein mechanical super cooling
Cooling cycle system is that both vapor compression is pressurized refrigeration cycle, and refrigerant is low GWP mixed non-azeotropic refrigerant CO2/R1234ze、
CO2/ R1234yf, R41/R1234ze, R41/R1234yf, R32/R1234ze, R32/R1234yf or R32/R600a.
The technical solution used in the present invention is:
A kind of non-azeotropic working medium mechanical-assisted supercooling CO2Trans-critical cycle cooling cycle system, including non-azeotropic mixed working medium machine
Cooling cycle system and CO is subcooled in tool2Trans-critical cycle cooling cycle system；
The CO2Trans-critical cycle cooling cycle system includes gas cooler, medium temperature grade cooling evaporator, the cooling steaming of low-temperature level
Send out device, throttle valve, evaporator, compressor；The compressor outlet is connected with gas cooler entrance, gas cooler outlet with
Medium temperature grade cooling evaporator entrance is connected, and the outlet of medium temperature grade cooling evaporator is connected with low-temperature level cooling evaporator entrance, low temperature
The outlet of grade cooling evaporator is connect with expansion valve inlet, and expansion valve outlet is connected with evaporator inlet, evaporator inlet and compression
Machine is connected；
The non-azeotropic working medium supercharging mechanical supercooling circulatory system includes medium temperature grade compressor, condenser, high-temperature level throttling
Valve, liquid storage device, medium temperature grade throttle valve, by-passing valve, low-temperature level throttle valve, low-temperature level compressor；The medium temperature stage compressor outlet
It is connected with condenser inlet, condensator outlet is connected with high-temperature level throttling valve inlet, and high-temperature level throttling valve outlet enters with liquid storage device
Mouth is connected, and reservoir outlet is connected with bypass valve inlet, and bypass valve outlet is connected with medium temperature grade suction port of compressor；Liquid storage device is in
Warm grade throttling valve inlet is connected, and medium temperature grade throttling valve outlet is connected with medium temperature grade cooling evaporator entrance, the cooling evaporation of medium temperature grade
Device outlet is connected with medium temperature grade suction port of compressor；The liquid storage device is connected with low-temperature level throttling valve inlet, and low-temperature level throttle valve goes out
Mouth is connected with low-temperature level cooling evaporator entrance, and the outlet of low-temperature level cooling evaporator is connected with low-temperature level suction port of compressor, low temperature
Stage compressor outlet is connected with medium temperature grade suction port of compressor.
The medium temperature cooling evaporator, sub-cooled evaporator and condenser are counter-flow heat exchanger.
Non-azeotropic working medium supercharging mechanical is subcooled circularly cooling agent and uses natural refrigerant CO2, CO2The system of Trans-critical cycle refrigeration cycle
Cryogen is CO2/R1234ze、CO2/R1234yf、R41/R1234ze、R41/R1234yf、R32/R1234ze、R32/R1234yf
Or R32/R600a.
The low-temperature level compressor of non-azeotropic mixed working medium mechanical-assisted supercooling refrigeration system goes out low-temperature level cooling evaporator
Mouthful mixed non-azeotropic refrigerant be compressed to medium temperature grade evaporating pressure, with medium temperature cooling evaporator outlet medium temperature and medium pressure gas with
And the gas mixing in the gas-liquid separation through by-passing valve, enter medium temperature grade compressor later.Gas is compressed into high temperature and pressure gas
Body, enters condenser later, and the liquid of condensator outlet is first that gas-liquid two-phase fluid enters liquid storage through the throttling of medium temperature grade throttle valve
In device, realize gas-liquid separation in liquid storage device, liquid pass through in mild low-temperature level throttle valve throttled respectively to medium temperature and low-temperature level
Cooling evaporator, and evaporated in the cooling evaporator respectively, CO2Fluid is real followed by medium temperature and low-temperature level evaporator
Now to CO2Fluid carries out once cooling and secondary cooling, so that CO2Obtain higher degree of supercooling, the non-azeotrope work after heat absorption evaporation
Matter all becomes saturated air, respectively enters low temperature and medium temperature grade compressor is compressed, and completes mechanical super cooling circulation.
CO2The working medium filled in cooling cycle system is CO2, compressor by refrigerant compression at high temperature and high pressure gas, first
Exchange heat into gas cooler and air, later followed by medium temperature supercooling evaporator and low temperature supercooling evaporator and with it is non-
Azeotropic working medium is carried out continuously to exchange heat twice, after in throttle valve expand decompression, CO2Decompression becomes the biphase gas and liquid flow of low-temp low-pressure
Then body flows into evaporator and absorbs heat, sucks suction port of compressor after becoming low temperature low pressure gas, complete circulation.
Compared with prior art, the advantages and positive effects of the present invention are:
(1)CO2The refrigerant of refrigeration system is natural refrigerant CO2。CO2GWP be 1, ODP 0, it is safe and non-toxic it is non-combustible,
It is cheap easily to obtain, do not decompose generation pernicious gas, mechanical super cooling cycle fluid CO under the high temperature conditions yet2/R1234ze、CO2/
The GWP of R1234yf, R41/R1234ze, R41/R1234yf, R32/R1234ze, R32/R1234yf or R32/R600a are lower,
Refrigerant used in system is environmental-friendly refrigerant.
(2) mechanical super cooling circulation uses mixed non-azeotropic refrigerant, and temperature glide is suitable with the inlet and outlet temperature difference of air,
Refrigerant is alternating temperature process in condenser and evaporator phase transition process, wherein condenser side non-azeotropic refrigerant and air shape
At good Temperature Matching.Supercritical CO2It is cooled down twice in fluid subcooling process, the temperature drop of each subcooling process is not
Height forms good Temperature Matching with non-azeotropic refrigerant low temperature and medium temperature evaporation process, and heat exchange irreversible loss greatly reduces.
In conclusion the irreversible damage of heat exchange of the condenser and cooling evaporator recycled by lesser mechanical super cooling, obtains higher
CO2The degree of supercooling of gas cooler improves system energy efficiency, increases refrigerating capacity.
(3) by mechanical super cooling system to CO2The CO of system gas cooler outlet2It is subcooled, is lowered into expansion valve
Preceding CO2Temperature reduces expansion-loss, and further decreases CO2Run high pressure.
(4) mechanical-assisted crosses SAPMAC method liquid storage device and plays the role of flash tank, reduces evaporator inlet refrigerant enthalpy
Value, improves system performance.
(5) opposite CO2 transcritical cooling system, the small in size of mechanical super cooling circulation, wasted work are few, by configuring small refrigeration
Being obviously improved for performance can be realized in system, and at low cost, economic advantages are obvious.
Detailed description of the invention
Fig. 1 is that CO is subcooled in non-azeotropic working medium supercharging mechanical of the present invention2The CO of Trans-critical cycle cooling cycle system2Trans-critical cycle refrigeration
The Sweet service of circulation；
Fig. 2 is that CO is subcooled in non-azeotropic working medium supercharging mechanical of the present invention2Refrigeration is subcooled in the auxiliary of Trans-critical cycle cooling cycle system
The Sweet service of circulation；
Fig. 3 is that CO is subcooled in non-azeotropic working medium supercharging mechanical of the present invention2The schematic diagram of Trans-critical cycle cooling cycle system.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
The present invention includes the both vapor compression supercharging mechanical supercooling circulatory system and CO as shown in Figure 12Trans-critical cycle refrigeration cycle system
System, heavy line CO2Trans critical cycle (1 ' -2 ' -3 ' -4 ' -5 ' -6 ' -1 '), fine line are that the supercooling of both vapor compression supercharging mechanical follows
The low-temperature evaporation process (10-12) and high temperature evaporation process (6-7) of ring.Fig. 2 is non-azeotropic working medium supercharging mechanical of the present invention supercooling
CO2The Sweet service of the auxiliary supercooling refrigeration cycle of Trans-critical cycle cooling cycle system, wherein 3 ' -4 ' be CO2Level-one subcooling process,
6 ' -5 ' be CO2Second level subcooling process.
Present system is as shown in Figure 3:
Step 1: compressor 1 sucks the saturation CO of the low-temp low-pressure in 6 exit of evaporator2Gas compresses it into high temperature
The gas of high pressure, temperature reduces after being exchanged heat in gas cooler 2 with air, flows separately through medium temperature cooling evaporator later
3 exchange heat with sub-cooled evaporator 4 with mixed non-azeotropic refrigerant, realize CO2Supercooling enters back into the throttling drop of throttle valve 5
Pressure, becomes gas-liquid two-phase state.Become overheated gas after 6 evaporation endothermic of evaporator again and enter compressor, completes CO2Trans-critical cycle
Circulation.
Step 2: mechanical super cooling circulation low-temperature level compressor 14 absorbs the low-temp low-pressure in 4 exit of sub-cooled evaporator
Refrigerant compresses it into the overheated gas of medium temperature and medium pressure, with the saturated gas of medium temperature cooling evaporator 3 and from liquid storage device 10
Enter medium temperature grade compressor 7 after the gas-liquid two-phase state working medium mixing of bypass, high temperature and high pressure gas is compressed into, into condenser 8
With air heat-exchange.It is that gas-liquid two-phase enters in liquid storage device 10 through the throttling of medium temperature grade throttle valve 9, realizes gas-liquid point in liquid storage device 10
From, liquid flows to evaporator, gas bypass into 7 suction line of high-temperature level compressor, with medium temperature cooling evaporator 3 outlet and
Low-temperature level compressor 14, which exports after refrigerant is mixed together, enters medium temperature grade compressor 7.
Step 3: the gas-liquid two-phase fluid of medium temperature and medium pressure passes through medium temperature cooling evaporator 3 and CO2Primary heat exchange is carried out to become
The gas-liquid two-phase fluid of superheated vapor, low-temp low-pressure passes through sub-cooled evaporator 4 and CO2It carries out secondary heat exchange and becomes overheat steaming
Gas.It completes mechanical-assisted and crosses SAPMAC method.
Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited to upper
The specific embodiment stated, the above mentioned embodiment is only schematical, be not it is restrictive, this field it is common
Technical staff under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, may be used also
By make it is many in the form of, within these are all belonged to the scope of protection of the present invention.
Claims (3)
1. CO is subcooled in a kind of non-azeotropic working medium supercharging mechanical2Trans critical cycle refrigeration system, which is characterized in that by non-azeotropic working medium
The circulatory system and CO is subcooled in supercharging mechanical2Trans-critical cycle cooling cycle system coupling composition；
The CO2Trans-critical cycle cooling cycle system include gas cooler, medium temperature grade cooling evaporator, low-temperature level cooling evaporator,
Throttle valve, evaporator, compressor；The compressor outlet is connected with gas cooler entrance, gas cooler outlet and medium temperature
Grade cooling evaporator entrance is connected, and the outlet of medium temperature grade cooling evaporator is connected with low-temperature level cooling evaporator entrance, and low-temperature level is cold
But evaporator outlet is connect with expansion valve inlet, and expansion valve outlet is connected with evaporator inlet, evaporator inlet and compressor phase
Even；
The non-azeotropic working medium supercharging mechanical supercooling circulatory system includes medium temperature grade compressor, condenser, high-temperature level throttle valve, storage
Liquid device, medium temperature grade throttle valve, by-passing valve, low-temperature level throttle valve, low-temperature level compressor；The medium temperature stage compressor outlet and condensation
Device entrance is connected, and condensator outlet is connected with high-temperature level throttling valve inlet, and high-temperature level throttling valve outlet is connected with liquid storage device entrance,
Reservoir outlet is connected with bypass valve inlet, and bypass valve outlet is connected with medium temperature grade suction port of compressor；Liquid storage device and medium temperature grade section
It flows valve inlet to be connected, medium temperature grade throttling valve outlet is connected with medium temperature grade cooling evaporator entrance, the outlet of medium temperature grade cooling evaporator
It is connected with medium temperature grade suction port of compressor；The liquid storage device and low-temperature level throttling valve inlet are connected, low-temperature level throttling valve outlet with it is low
Warm grade cooling evaporator entrance is connected, and the outlet of low-temperature level cooling evaporator is connected with low-temperature level suction port of compressor, low-temperature level compression
Machine outlet is connected with medium temperature grade suction port of compressor.
2. CO is subcooled in non-azeotropic working medium supercharging mechanical according to claim 12Trans critical cycle refrigeration system, feature exist
In the medium temperature cooling evaporator, sub-cooled evaporator and condenser are counter-flow heat exchanger.
3. CO is subcooled in non-azeotropic working medium supercharging mechanical according to claim 12Trans critical cycle refrigeration system, feature exist
In non-azeotropic working medium supercharging mechanical is subcooled circularly cooling agent and uses natural refrigerant CO2, CO2The refrigerant of Trans-critical cycle refrigeration cycle is
CO2/R1234ze、CO2/ R1234yf, R41/R1234ze, R41/R1234yf, R32/R1234ze, R32/R1234yf or R32/
R600a。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910834735.7A CN110500824A (en) | 2019-09-05 | 2019-09-05 | A kind of non-azeotropic working medium supercharging mechanical supercooling CO2Transcritical cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910834735.7A CN110500824A (en) | 2019-09-05 | 2019-09-05 | A kind of non-azeotropic working medium supercharging mechanical supercooling CO2Transcritical cooling system |
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| CN110500824A true CN110500824A (en) | 2019-11-26 |
Family
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113776214A (en) * | 2021-09-18 | 2021-12-10 | 青岛科技大学 | Cascade refrigeration cycle system coupled with ejector and supercooling method |
| CN113776215A (en) * | 2021-09-18 | 2021-12-10 | 青岛科技大学 | Circulating system applied to cascade refrigeration or heat pump system and supercooling method |
| CN113956850A (en) * | 2021-10-18 | 2022-01-21 | 珠海格力电器股份有限公司 | Environment-friendly mixed refrigerant, preparation method thereof and refrigeration system |
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| WO2008019689A2 (en) * | 2006-08-18 | 2008-02-21 | Knudsen Køling A/S | A transcritical refrigeration system with a booster |
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| US20190153283A1 (en) * | 2017-11-17 | 2019-05-23 | Honeywell International Inc. | Heat transfer compositions, methods and systems |
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2019
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| JP2000161805A (en) * | 1998-11-27 | 2000-06-16 | Daikin Ind Ltd | Refrigerating apparatus |
| WO2008019689A2 (en) * | 2006-08-18 | 2008-02-21 | Knudsen Køling A/S | A transcritical refrigeration system with a booster |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113776214A (en) * | 2021-09-18 | 2021-12-10 | 青岛科技大学 | Cascade refrigeration cycle system coupled with ejector and supercooling method |
| CN113776215A (en) * | 2021-09-18 | 2021-12-10 | 青岛科技大学 | Circulating system applied to cascade refrigeration or heat pump system and supercooling method |
| CN113956850A (en) * | 2021-10-18 | 2022-01-21 | 珠海格力电器股份有限公司 | Environment-friendly mixed refrigerant, preparation method thereof and refrigeration system |
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Application publication date: 20191126 |