CN106766317A - A kind of CO of both vapor compression auxiliary supercooling2Trans-critical cycle kind of refrigeration cycle freezer - Google Patents
A kind of CO of both vapor compression auxiliary supercooling2Trans-critical cycle kind of refrigeration cycle freezer Download PDFInfo
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- CN106766317A CN106766317A CN201710052317.3A CN201710052317A CN106766317A CN 106766317 A CN106766317 A CN 106766317A CN 201710052317 A CN201710052317 A CN 201710052317A CN 106766317 A CN106766317 A CN 106766317A
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- Prior art keywords
- refrigeration
- injector
- freezing
- gas
- evaporator
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Classifications
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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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
- F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
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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)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses a kind of CO of both vapor compression auxiliary circulation2Transcritical cooling system.Main circulation loop of the present invention includes the main recycle compressor outlet being sequentially connected, gas cooler and CO2Cooling evaporator, CO2Cooling evaporation connects freezing injector entrance and refrigeration injector entrance respectively, and freezing is exported with injector and refrigeration injector exports connection gas-liquid separator gas access respectively；Gas-liquid separator gas vent connects main recycle compressor entrance；Gas-liquid separator liquid outlet respectively by and refrigeration expansion valve connect freezing evaporator inlet and refrigeration evaporator inlet；Freezing evaporator outlet and refrigeration evaporator outlet connect freezing injector and refrigeration injector respectively；Auxiliary circulation loop is by the auxiliary circulation compressor that is sequentially connected, auxiliary circulation condenser, auxiliary circulation throttling arrangement and CO2Cooling evaporator is constituted, and mixed non-azeotropic refrigerant is used in auxiliary circulation.The present invention can be greatly reduced the system high pressure and compressor exhaust temperature of major cycle, restriction loss is greatly decreased, refrigerating capacity is improved, and ensure that the environmental protection characteristic of system.
Description
Technical field
It is furnished with and is mixed using low GWP non-azeotrope the present invention relates to freezer refrigeration system technical field, more particularly to one kind
Close the CO of the both vapor compression auxiliary circulation of refrigerant2Trans-critical cycle kind of refrigeration cycle freezer.
Background technology
Climate change is the significant challenge that mankind nowadays society faces, and is damaged the ozone layer and with greenhouse effects higher
By or will be gradually disabled, natural refrigerant turn into current refrigeration industry study hotspot.In numerous natural refrigerants, most generation
Table and competitiveness are CO2。CO2Refrigeration system is the important directions of Refrigeration Technique development.
CO2Cooling cycle system is high due to its operating pressure, and throttling irreversible loss is big, causes circulation substantial deviation reverse
Carnot cycle, CO2Trans critical cycle efficiency is circulated less than conventional refrigerant.
Improve CO2Trans-critical cycle kind of refrigeration cycle efficiency, promotion CO2Refrigeration system application provides a new road, to mitigating temperature
Room effect, realize HCFCs substitute have important economic worth and social effect.
The content of the invention
The present invention is in order to overcome the deficiencies in the prior art, in CO2One kind in parallel is furnished with the basis of transcritical cooling system
And using the both vapor compression auxiliary circulation of low GWP mixed non-azeotropic refrigerants, use CO2Cooling evaporator realizes major cycle with auxiliary
The link of circulation, reduces the outlet temperature of major cycle gas cooler, reduces the irreversible loss in throttling process, reduces system
High pressure and compressor exhaust temperature, improve refrigerating capacity, and ensure the environmental protection characteristic of system.
The present invention to achieve the above object, is achieved through the following technical solutions, a kind of CO of both vapor compression auxiliary circulation2Across
Critical refrigeration systems, main circulation loop includes that the main recycle compressor 1 that is sequentially connected is exported, gas cooler 2 and CO2Cooling is steamed
Hair device 6, CO2Cooling evaporation connects the freezing entrance of injector 7 and the entrance of refrigeration injector 8 respectively, and freezing injector 7 goes out
Mouth and refrigeration injector 8 export connection gas-liquid separator 11 gas access respectively；Gas-liquid separator gas vent connection master follow
The entrance of ring compressor 1；The liquid outlet of gas-liquid separator 11 connects freezing evaporator 9 and enters by 12 and refrigeration expansion valve respectively
Mouth and the refrigeration entrance of evaporator 10；Freezing evaporator 9 is exported and refrigeration evaporator 10 exports connection freezing respectively with drawing
Emitter 7 and refrigeration injector 8；Auxiliary circulation loop by the auxiliary circulation compressor 3 that is sequentially connected, auxiliary circulation condenser 4,
Auxiliary circulation throttling arrangement 5 and CO2Cooling evaporator 6 is constituted, and mixed non-azeotropic refrigerant is used in auxiliary circulation.
Beneficial effect：Compared with prior art, by using mixed non-azeotropic refrigerant in auxiliary circulation, using auxiliary
The temperature-changing characteristic of mixed non-azeotropic refrigerant evaporation process and major cycle supercritical CO in circulation2Temperature-changing characteristic realize temperature
Match somebody with somebody, so as to reduce the irreversible loss that heat transfer temperature difference brings, improve and circulate overall thermodynamics consummating degree, lifting system performance,
By the evaporation process of auxiliary circulation by major cycle gas CO2Heat be transferred to atmospheric environment or cooling water, realize CO2Supercooling,
And then reduce restriction loss, increase refrigerating capacity.And major cycle throttling arrangement reclaims one instead of choke valve using injector
Divide the pressure potential of expansion process, so as to improve the pressure of inspiration(Pi) of compressor, reduce the input work of compressor, further improve system
The COP of system.
Brief description of the drawings
Fig. 1 is present systemT-sFigure.
Fig. 2 is schematic structural view of the invention.
In figure：1st, main recycle compressor, 2, gas cooler, 3, auxiliary circulation compressor, 4, auxiliary circulation condenser,
5th, auxiliary circulation throttling arrangement, 6, CO2Cooling evaporator, 7, freezing injector, 8, refrigeration injector, 9, freezing evaporation
Device, 10, refrigeration evaporator, 11, gas-liquid separator, 12, freezing expansion valve, 13, refrigeration expansion valve.
Specific embodiment
Core of the invention is, using mixed non-azeotropic refrigerant, to freeze compared to common pure refrigerant in auxiliary circulation
Agent, can effectively realize the Temperature Matching in subcooling process, so as to reduce the irreversible loss that heat transfer temperature difference brings, improve circulation whole
The thermodynamics consummating degree of body, lifting system performance；Method compared to expansion work is reclaimed using expanding machine, simplifies system knot
Structure, reduces cost.
As shown in Fig. 2 main circulation loop includes that the main recycle compressor 1 that is sequentially connected is exported, gas cooler 2 and CO2
Cooling evaporator 6, CO2Cooling evaporation connects the freezing entrance of injector 7 and the entrance of refrigeration injector 8 respectively, and freezing is with drawing
Emitter 7 is exported and refrigeration injector 8 exports connection gas-liquid separator 11 gas access respectively；Gas-liquid separator gas vent connects
Connect the entrance of main recycle compressor 1；The liquid outlet of gas-liquid separator 11 is connected freezing and is used by 12 and refrigeration expansion valve 13 respectively
The entrance of evaporator 9 and the refrigeration entrance of evaporator 10；Freezing evaporator 9 is exported and refrigeration evaporator 10 is exported and connected respectively
Freezing injector 7 and refrigeration injector 8；Auxiliary circulation loop is by the auxiliary circulation compressor 3 that is sequentially connected, auxiliary circulation
Condenser 4, auxiliary circulation throttling arrangement 5 and CO2Cooling evaporator 6 is constituted, and mixed non-azeotropic refrigerant is used in auxiliary circulation.
Mixed non-azeotropic refrigerant can use R41 (difluoromethane/pentafluoroethane)/R152a（1-1 Difluoroethanes）.
Fig. 1 is present systemT-sFigure, in figure：Circulation a-b-c-d-a is tradition CO2Trans-critical cycle choke valve kind of refrigeration cycle,
Circulation a-b-c "-d "-a are that had SAPMAC method, i.e. CO2Major cycle, circulation a '-b '-c '-d '-a ' are auxiliary circulation, refrigeration working medium
Conventional refrigerant may be selected.Limited by environment temperature（It is assumed to be 35 DEG C）, CO2The outlet temperature of gas cooler is higher, is
Reduce CO before throttling2Temperature, can be by the evaporation process of auxiliary circulation（d’-a’）By CO in major cycle2Subcooling process（c-
c”）Liberated heat is transferred to cooling water or atmospheric environment, realizes CO2Supercooling, and then reduce restriction loss, increase refrigerating capacity.
Realize the subcooler referred to as CO of the heat transfer process2Cooling evaporator.
CO2Cooling evaporator 6 is realized being coupled major cycle and auxiliary circulation, is novel C O2Trans-critical cycle kind of refrigeration cycle
Key building block.The CO of gas cooler outlet2It is supercriticality, produces larger temperature to slide in subcooling process
Move, temperature is gradually reduced.For auxiliary circulation side refrigerant, if pure refrigerant, its evaporation process is constant temperature process, and for
Non-azeotropic mixed working medium is alternating temperature process.For pure refrigerant, CO2Outlet side both sides refrigerant temperature difference is smaller, but entrance side temperature
Difference is very high, because higher temperatures difference produces very big heat transfer temperature difference irreversible loss during the refrigerant heat exchanger of both sides, reduces and follows
The overall thermodynamics consummating degree of ring, have impact on the systematic function of circulation.And for non-azeotropic mixed working medium, due to non-azeotrope mixing
There is temperature glide in thing, its saturation temperature gradually rises with the carrying out of evaporation process in the phase transition process of heat exchanger, with CO2's
Temperature change forms good Temperature Matching, reduces the irreversible loss in cooling evaporator heat transfer process, improves circulation
Overall thermodynamics consummating degree, improves circular flow performance.Each constituent element of non-azeotropic mixed working medium selects low GWP refrigerants,
Ensure that the refrigerant environment of auxiliary circulation is friendly
For CO2Trans-critical cycle kind of refrigeration cycle freezer, because system running pressure is high, can be had using injector instead of conventional throttle valve
Effect reclaims the pressure potential of expansion process, so as to improve the pressure of inspiration(Pi) of compressor, reduces the input work of compressor, and then improve
The COP of system.
Claims (2)
1. the CO that a kind of both vapor compression auxiliary is subcooled2Trans-critical cycle kind of refrigeration cycle freezer, it is characterised in that main circulation loop include according to
The main recycle compressor outlet of secondary connection, gas cooler and CO2Cooling evaporator, CO2Cooling evaporator connects freezing and uses respectively
Injector entrance and refrigeration injector entrance, freezing is exported with injector and refrigeration injector exports connection gas-liquid point respectively
From device gas access；Gas-liquid separator gas vent connects main recycle compressor entrance；Gas-liquid separator liquid outlet leads to respectively
Cross and refrigeration expansion valve connection freezing evaporator inlet and refrigeration evaporator inlet；Freezing evaporator outlet and refrigeration
Connect freezing injector and refrigeration injector respectively with evaporator outlet.
2. the CO that the both vapor compression auxiliary according to claims 1 is subcooled2Trans-critical cycle kind of refrigeration cycle freezer, it is characterised in that
The auxiliary circulation loop by the auxiliary circulation compressor that is sequentially connected, auxiliary circulation condenser, auxiliary circulation throttling arrangement and
CO2Cooling evaporator is constituted, and mixed non-azeotropic refrigerant is used in auxiliary circulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710052317.3A CN106766317A (en) | 2017-01-24 | 2017-01-24 | A kind of CO of both vapor compression auxiliary supercooling2Trans-critical cycle kind of refrigeration cycle freezer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710052317.3A CN106766317A (en) | 2017-01-24 | 2017-01-24 | A kind of CO of both vapor compression auxiliary supercooling2Trans-critical cycle kind of refrigeration cycle freezer |
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| CN106766317A true CN106766317A (en) | 2017-05-31 |
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| CN201710052317.3A Pending CN106766317A (en) | 2017-01-24 | 2017-01-24 | A kind of CO of both vapor compression auxiliary supercooling2Trans-critical cycle kind of refrigeration cycle freezer |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109551996A (en) * | 2018-12-05 | 2019-04-02 | 上海交通大学 | Assist the carbon dioxide automobile heat pump air-conditioning system of supercooling |
| CN110701811A (en) * | 2019-10-29 | 2020-01-17 | 中机国能炼化工程有限公司 | Injection supercharging step supercooling injection throttling transcritical CO2System and application |
| CN110701810A (en) * | 2019-10-29 | 2020-01-17 | 中机国能炼化工程有限公司 | Injection supercharging two-stage series connection supercooling double-temperature-zone refrigerating system and application |
| CN110701813A (en) * | 2019-10-29 | 2020-01-17 | 中机国能炼化工程有限公司 | High-pressure injection trans-critical CO2Multi-joint supply system and application |
| CN110701812A (en) * | 2019-10-29 | 2020-01-17 | 中机国能炼化工程有限公司 | Supercritical CO is striden in ejector pressure boost subcooling expander coupling2System and application |
| CN113513854A (en) * | 2021-08-09 | 2021-10-19 | 上海海洋大学 | Transcritical CO with high pressure ejector2Mechanical supercooling refrigerating system |
| CN113776214A (en) * | 2021-09-18 | 2021-12-10 | 青岛科技大学 | Cascade refrigeration cycle system coupled with ejector and supercooling method |
| CN115096011A (en) * | 2022-06-20 | 2022-09-23 | 江苏凌氢新能源科技有限公司 | Cascaded ejector multiple evaporator refrigeration system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109551996A (en) * | 2018-12-05 | 2019-04-02 | 上海交通大学 | Assist the carbon dioxide automobile heat pump air-conditioning system of supercooling |
| CN110701811A (en) * | 2019-10-29 | 2020-01-17 | 中机国能炼化工程有限公司 | Injection supercharging step supercooling injection throttling transcritical CO2System and application |
| CN110701810A (en) * | 2019-10-29 | 2020-01-17 | 中机国能炼化工程有限公司 | Injection supercharging two-stage series connection supercooling double-temperature-zone refrigerating system and application |
| CN110701813A (en) * | 2019-10-29 | 2020-01-17 | 中机国能炼化工程有限公司 | High-pressure injection trans-critical CO2Multi-joint supply system and application |
| CN110701812A (en) * | 2019-10-29 | 2020-01-17 | 中机国能炼化工程有限公司 | Supercritical CO is striden in ejector pressure boost subcooling expander coupling2System and application |
| CN113513854A (en) * | 2021-08-09 | 2021-10-19 | 上海海洋大学 | Transcritical CO with high pressure ejector2Mechanical supercooling refrigerating system |
| CN113776214A (en) * | 2021-09-18 | 2021-12-10 | 青岛科技大学 | Cascade refrigeration cycle system coupled with ejector and supercooling method |
| CN115096011A (en) * | 2022-06-20 | 2022-09-23 | 江苏凌氢新能源科技有限公司 | Cascaded ejector multiple evaporator refrigeration system |
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Application publication date: 20170531 |