CN106196685A - A kind of critical-cross carbon dioxide refrigeration system - Google Patents
A kind of critical-cross carbon dioxide refrigeration system Download PDFInfo
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- CN106196685A CN106196685A CN201610585929.4A CN201610585929A CN106196685A CN 106196685 A CN106196685 A CN 106196685A CN 201610585929 A CN201610585929 A CN 201610585929A CN 106196685 A CN106196685 A CN 106196685A
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- compressor
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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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Mechanical Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
A kind of critical-cross carbon dioxide refrigeration system, is same air vent including integral type expansion compressor, the air vent of first cylinder of compressor and the air vent of second parallel cylinder, and this air vent is connected with the entrance of gas cooler；The air inlet of first cylinder of compressor is connected with the outlet of vaporizer, and the air inlet of second cylinder of compressor is connected with the side outlet of gas-liquid separator；The entrance of decompressor is connected with the outlet of gas cooler, and the cold-producing medium of expander outlet entrance with gas-liquid separator after the throttling of electric expansion valve is connected；Gas-liquid separator hydraulic fluid side exports the cold-producing medium the flowed out entrance with vaporizer after the throttling of electric expansion valve and is connected；The present invention, by the way of using integral type expansion compressor, twin-tub to compress simultaneously and once expand twice throttling, can make the refrigeration performance of critical-cross carbon dioxide refrigeration system be improved.
Description
Technical field
The invention belongs to refrigeration technology field, be specifically related to a kind of critical-cross carbon dioxide refrigeration system.
Background technology
Owing to the environmental problem such as global air temperature warming, unusual weather conditions is day by day serious, environmental protection and energy saving become whole international community
One of focal issue.Refrigerating and air conditioning industry etc. in recent decades, a large amount of use CFCs and HCFCs refrigeration working mediums, cause air
Ozone hole and the harm of greenhouse effect, extensively admitted by people.CFCs is for ozone layer and the unfavorable shadow of atmospheric warming
Ring, protect environment, it is achieved CFCs substitutes becomes the problem that the whole world is paid close attention to jointly.HFCs class working medium, because not having for ozone layer
There is destructive power, become the important working medium substituting CFCs.But they chemical stabilizations, can accumulate after release, and this ultimately results in bright
Aobvious greenhouse effect.Although people can make great efforts synthesis performance more preferably working medium, but owing to the usage amount of cold-producing medium is very big,
Considerable part is the most inevitably had to leak in air.Any a large amount of synthetic material is discharged in nature, all
Can impact for environment, the most present a kind of universal viewpoint is to use natural refrigerant.Therefore the research of CO2 refrigerating plant
The most valued focus is become again with application.
Owing to natural refrigerant CO2 is with its good environmental protection characteristic, excellent heat-transfer character and sizable unit volume system
The advantages such as cold, front International Institute or Refrigeration chairman G.Lorentzen thinks that carbon dioxide is irreplaceable refrigeration working medium, and carries
Go out trans critical cycle theoretical, it is indicated that it is expected to play a significant role at air conditioning for automobiles and art of heat pumps.
Trans critical cycle is used as cold-producing medium using carbon dioxide, owing to hiigh pressure stage pressure is higher, the pressure reduction before and after throttling
Relatively big, the supercritical fluid of system is directly throttled to two-phase section, and the mass dryness fraction on the one hand causing two-phase working substance is higher, is unfavorable for system
The raising of cold energy power.On the other hand, the direction deviation that the constant enthalpy alignment entropy of throttling process increases is relatively big, causes the damage of throttling process
Lose the restriction loss much larger than conventional refrigerant.The system of basic critical-cross carbon dioxide circulation by compressor, gas cooler,
Throttling arrangement and vaporizer composition, system is 8 DEG C in evaporating temperature, and air cooler outlet temperature is 40 DEG C, and suction superheat is 5
DEG C, in the case of compressor isentropic efficiency is 0.7, the COP that CO 2 cross-critical circulates substantially is the scope of 2.5～3, circulation
The coefficient of performance of coefficient of performance conventional refrigerant to be far below circulation.
Summary of the invention
In order to overcome the defect of above-mentioned prior art, it is an object of the invention to provide a kind of critical-cross carbon dioxide refrigeration
System, it is possible to solve that conventional transcritical carbon dioxide recycle efficiency is relatively low, restriction loss is excessive, the mass dryness fraction of two-phase working substance after throttling
The problem that higher, refrigerating capacity is less.
In order to achieve the above object, the present invention adopts the following technical scheme that
A kind of critical-cross carbon dioxide refrigeration system, including integral type expansion-compression machine 1, integral type expansion-compression machine 1
In the air vent of first cylinder 108 of compressor 3 and the air vent of second cylinder 109 be same air vent 110, row
QI KOU 110 is connected with the entrance of gas cooler 6；3 first air inlets 106 of cylinder 108 of compressor and going out of vaporizer 5
Mouth is connected, and the air inlet 107 of 3 second cylinders 109 of compressor is connected with the side outlet of gas-liquid separator 8；
The entrance of the decompressor 2 in integral type expansion-compression machine 1 is connected with the outlet of gas cooler 6, decompressor 2
The cold-producing medium of outlet is connected with the entrance of gas-liquid separator 8 after A electric expansion valve 7 throttles, gas-liquid separator 8 hydraulic fluid side
The cold-producing medium that outlet is flowed out is connected with the entrance of vaporizer 5 after B electric expansion valve 4 throttles.
Described integral type expansion-compression machine 1 includes closed shell 103, and closed shell 103 bottom is fixed with compressor 3, close
The top of closed shell body 103 is fixed with decompressor 2, and one end of main shaft 105 is connected with compressor 3, and the other end is connected with decompressor 2；
The motor 104 for drive shaft 105 it is equipped with between compressor 3 and decompressor 2.
Compressor 3 in described integral type expansion-compression machine 1 is Double-cylinder rolling-rotor type compressor, and first gas
Cylinder 108 is parallelly compressed with second cylinder 109.
Decompressor 2 in described integral type expansion-compression machine 1 is scroll expansion machine or rolling rotor-type expander.
Beneficial effects of the present invention:
Critical-cross carbon dioxide refrigeration system of the present invention, the working medium of use is natural refrigerant carbon dioxide, permissible
Solve existing cold-producing medium welding and the problem of greenhouse effect.
Compared to existing conventional transcritical carbon dioxide refrigerating system, in inventive refrigeration system, compressor uses twin-tub
Compress simultaneously.So can increase the mass flowrate of cold-producing medium, and then make the COP of system improve.Refrigeration system have employed one
Secondary expansion adds the method for twice throttling, be possible not only to reduce restriction loss, it is also possible to make the carbon dioxide mass dryness fraction after throttling less,
Refrigeration quantitative change is big, and system COP averagely improves about 15%.Refrigeration system uses integral type expansion-compression machine, decompressor and pressure
Contracting machine is connected by an axle, and therefore the expansion work that decompressor is reclaimed can reduce as a part of work done during compression of compressor
The wasted work of compressor.In a word, this system is a kind of economy, effective, feasible improving countermeasure, can effectively improve Trans-critical cycle two
The coefficient of performance of carbonoxide refrigeration system.
Accompanying drawing explanation
Fig. 1 is the system schematic of kind of refrigeration cycle of the present invention；Wherein: 1 is integral type expansion-compression machine, and 2 is decompressor, 3
Being compressor, 4 is B electric expansion valve, and 5 is vaporizer, and 6 is gas cooler, and 7 is A electric expansion valve, and 8 is gas-liquid separator.
In Fig. 1, state point a～i on connecting line is to correspond respectively to state point a～i on Fig. 2 pressure-enthalpy chart.
Fig. 2 is the pressure-enthalpy chart of kind of refrigeration cycle of the present invention, and state point a～i in Fig. 2 corresponds respectively on Fig. 1 connecting line
State point a～i.
Fig. 3 is the diagrammatic sectional view of the first integral type expansion-compression machine of the present invention, uses scroll expansion machine, wherein:
101 is expander inlet, and 102 is expander exhaust gas mouth, and 103 is the housing of integral type expansion compressor, and 104 is motor, 105
Being main shaft, 106 is the air entry of first cylinder of compressor, and 108 is first cylinder of compressor, and 107 is compressor second
The air entry of individual cylinder, 109 is second cylinder of compressor, and 110 is the air vent of compressor.
Fig. 4 is the diagrammatic sectional view of the second integral type expansion-compression machine of the present invention, in this integral type expansion-compression machine
Decompressor uses rolling rotor-type expander structure, and remaining structure is identical with the first integral type expansion-compression machine structure；Its
In: 111 is expander inlet, and 112 is expander exhaust gas mouth.
Detailed description of the invention
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings.
As it is shown in figure 1, a kind of critical-cross carbon dioxide refrigeration system, including integral type expansion-compression machine 1, integral type is swollen
The air vent of first cylinder 108 of the compressor 3 in swollen-compressor 1 and the air vent of second cylinder 109 are same row
QI KOU 110, air vent 110 is connected with the entrance of gas cooler 6.The air inlet 106 of 3 first cylinders 108 of compressor with
The outlet of vaporizer 5 is connected, the air inlet 107 of 3 second cylinders 109 of compressor and the side outlet of gas-liquid separator 8
It is connected.
The entrance of the decompressor 2 in integral type expansion-compression machine 1 is connected with the outlet of gas cooler 6, decompressor 2
The cold-producing medium of outlet is connected with the entrance of gas-liquid separator 8 after A electric expansion valve 7 throttles.Gas-liquid separator 8 hydraulic fluid side
The cold-producing medium that outlet is flowed out is connected with the entrance of vaporizer 5 after B electric expansion valve 4 throttles.
With reference to Fig. 3, described integral type expansion-compression machine 1 includes that closed shell 103, closed shell 103 bottom are fixed with pressure
Contracting machine 3, the top of closed shell 103 are fixed with decompressor 2, and one end of main shaft 105 is connected with compressor 3, the other end and expansion
Machine 2 connects；The motor 104 for drive shaft 105 it is equipped with between compressor 3 and decompressor 2.
Compressor 3 in described integral type expansion-compression machine 1 is Double-cylinder rolling-rotor type compressor, and first gas
Cylinder 108 is parallelly compressed with second cylinder 109.
Decompressor 2 in described integral type expansion-compression machine 1 is scroll expansion machine or rolling rotor-type expander.
Described critical-cross carbon dioxide refrigeration system, uses the temperature once expanding the method reduction cold-producing medium adding twice throttling
Degree, decompressor is front, and two electric expansion valves are rear.
The operation principle of the present invention is: operationally, the carbon dioxide of low-temp low-pressure is respectively by compressing for refrigeration system
The air entry 106 of machine enters first cylinder 108 of compressor, is entered second cylinder 109 of compressor by air entry 107,
The supercritical fluid of boil down to High Temperature High Pressure simultaneously.Then it is drained in housing 103 by cylinder.The titanium dioxide of High Temperature High Pressure subsequently
Carbon is discharged by air vent 110.The carbon dioxide of High Temperature High Pressure enters in gas cooler 6 and cools down.Carbon dioxide after cooling
Being entered in decompressor by decompressor air entry 101 (or decompressor air entry 111 in Fig. 4) and expand, the expansion work of recovery can
Think that compressor importation power is to reduce energy consumption.Arrange from expander exhaust gas mouth 102 (or expander exhaust gas mouth 112 Fig. 4)
The carbon dioxide gone out is substantially close to saturated liquid line.Carbon dioxide carries out throttling for the first time through A electric expansion valve 7 subsequently.Joint
Carbon dioxide after stream enters gas-liquid separator 8, and carbon dioxide at this moment is in a two-phase state.Subsequently, in gas-liquid separator 8
Atmospheric carbon dioxide enters second cylinder 109 of compressor through pipeline and is compressed.Liquid titanium dioxide in gas-liquid separator 8
Carbon carries out flowing through vaporizer 5 after second time throttles through B electric expansion valve 4 and freezes, and enters back into the first of compressor afterwards
Individual cylinder 108 is compressed, and so circulates.
Being illustrated in figure 2 the circulation pressure-enthalpy diagram (P-h figure) of cooling cycle system work process of the present invention, illustrated is
System work process is: a → b is first cylinder 108 that the carbon dioxide of low-temp low-pressure is entered compressor by air inlet 106
The process of rear boil down to supercriticality, c → d is that the carbon dioxide of low-temp low-pressure is entered compressor by air inlet 107
The process of boil down to supercriticality after second cylinder 109.B, d → e is that supercritical carbon dioxide is drained into housing by cylinder
In 103, after being discharged subsequently, enter into the process cooled in gas cooler 6 by air vent 110.E → f is two after cooling down
Carbonoxide enters into the process expanded in decompressor by decompressor 2 air entry 101 (or decompressor 2 air entry 111 in Fig. 4),
The expansion work reclaimed can be that compressor importation power is to reduce energy consumption.F → g is that carbon dioxide is through A electric expansion valve 7
Carry out the process throttled for the first time.Carbon dioxide after throttling enters gas-liquid separator 8, and carbon dioxide at this moment is in biphase shape
State.G → c is that biphase carbon dioxide is isolated gaseous carbon dioxide in gas-liquid separator and enters second cylinder of compressor
The process of 109, g → h is the process that biphase carbon dioxide is separated into liquid carbon dioxide in gas-liquid separator 8.H → i is gas
Liquid CO 2 in liquid/gas separator 8 carries out, through B electric expansion valve 4, the process that second time throttles, and i → a is carbon dioxide
The process of evaporation endothermic in vaporizer 5.Above procedure constitutes whole circulation.
Claims (4)
1. a critical-cross carbon dioxide refrigeration system, including integral type expansion-compression machine (1), integral type expansion-compression machine
(1) air vent of first cylinder (108) of the compressor (3) in and the air vent of second cylinder (109) are same row
QI KOU (110), air vent (110) is connected with the entrance of gas cooler (6), entering of compressor (3) first cylinder (108)
QI KOU (106) is connected with the outlet of vaporizer (5), the air inlet (107) of (3) second cylinders (109) of compressor and gas-liquid
The side outlet of separator (8) is connected；
The entrance of the decompressor (2) in integral type expansion-compression machine (1) is connected with the outlet of gas cooler (6), decompressor
(2) cold-producing medium exported is connected with the entrance of gas-liquid separator (8) after A electric expansion valve (7) throttles.Gas-liquid separator
(8) cold-producing medium that hydraulic fluid side outlet is flowed out is connected with the entrance of vaporizer (5) after B electric expansion valve (4) throttles.
A kind of critical-cross carbon dioxide refrigeration system the most according to claim 1, it is characterised in that described integral type is swollen
Swollen-compressor (1) includes that closed shell (103), closed shell (103) bottom are fixed with compressor (3), closed shell (103)
Top be fixed with decompressor (2), one end of main shaft (105) is connected with compressor (3), and the other end is connected with decompressor (2)；?
The motor (104) for drive shaft (105) it is equipped with between compressor (3) and decompressor (2).
A kind of critical-cross carbon dioxide refrigeration system the most according to claim 1, it is characterised in that described integral type is swollen
Compressor (3) in swollen-compressor (1) is Double-cylinder rolling-rotor type compressor, and first cylinder (108) and second gas
Cylinder (109) is parallelly compressed.
A kind of critical-cross carbon dioxide refrigeration system the most according to claim 1, it is characterised in that described integral type is swollen
Decompressor (2) in swollen-compressor (1) is scroll expansion machine or rolling rotor-type expander.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610585929.4A CN106196685A (en) | 2016-07-22 | 2016-07-22 | A kind of critical-cross carbon dioxide refrigeration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610585929.4A CN106196685A (en) | 2016-07-22 | 2016-07-22 | A kind of critical-cross carbon dioxide refrigeration system |
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| CN106196685A true CN106196685A (en) | 2016-12-07 |
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| CN201610585929.4A Pending CN106196685A (en) | 2016-07-22 | 2016-07-22 | A kind of critical-cross carbon dioxide refrigeration system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612202A (en) * | 2018-12-28 | 2019-04-12 | 山东润银生物化工股份有限公司 | A method of synthesis ammonia circulating air condenses and separates liquefied ammonia |
| CN115264979A (en) * | 2022-08-02 | 2022-11-01 | 百尔制冷(无锡)有限公司 | Supercharged carbon dioxide refrigerating system |
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| CN2573964Y (en) * | 2002-10-08 | 2003-09-17 | 姚登洲 | Air expansion refrigerating device |
| CN1693820A (en) * | 2005-05-23 | 2005-11-09 | 西安交通大学 | Method for compression-expansion machine |
| JP2007178042A (en) * | 2005-12-27 | 2007-07-12 | Mitsubishi Electric Corp | Supercritical vapor compression type refrigerating cycle and cooling and heating air conditioning facility and heat pump hot-water supply machine using it |
| GB2446062A (en) * | 2007-01-26 | 2008-07-30 | Grasso Gmbh Refrigeration Tech | Carbon dioxide refrigeration system with compressors in two-stage arrangement |
| CN101910563A (en) * | 2008-01-29 | 2010-12-08 | 松下电器产业株式会社 | Expander-integrated compressor and refrigeration cycle device using the same |
| US20110005244A1 (en) * | 2009-07-07 | 2011-01-13 | Hamilton Sundstrand Corporation | Transcritical fluid cooling for aerospace applications |
| CN105444453A (en) * | 2015-12-18 | 2016-03-30 | 珠海格力电器股份有限公司 | Double-temperature refrigerating and heating system |
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2016
- 2016-07-22 CN CN201610585929.4A patent/CN106196685A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2573964Y (en) * | 2002-10-08 | 2003-09-17 | 姚登洲 | Air expansion refrigerating device |
| CN1693820A (en) * | 2005-05-23 | 2005-11-09 | 西安交通大学 | Method for compression-expansion machine |
| JP2007178042A (en) * | 2005-12-27 | 2007-07-12 | Mitsubishi Electric Corp | Supercritical vapor compression type refrigerating cycle and cooling and heating air conditioning facility and heat pump hot-water supply machine using it |
| GB2446062A (en) * | 2007-01-26 | 2008-07-30 | Grasso Gmbh Refrigeration Tech | Carbon dioxide refrigeration system with compressors in two-stage arrangement |
| CN101910563A (en) * | 2008-01-29 | 2010-12-08 | 松下电器产业株式会社 | Expander-integrated compressor and refrigeration cycle device using the same |
| US20110005244A1 (en) * | 2009-07-07 | 2011-01-13 | Hamilton Sundstrand Corporation | Transcritical fluid cooling for aerospace applications |
| CN105444453A (en) * | 2015-12-18 | 2016-03-30 | 珠海格力电器股份有限公司 | Double-temperature refrigerating and heating system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612202A (en) * | 2018-12-28 | 2019-04-12 | 山东润银生物化工股份有限公司 | A method of synthesis ammonia circulating air condenses and separates liquefied ammonia |
| CN115264979A (en) * | 2022-08-02 | 2022-11-01 | 百尔制冷(无锡)有限公司 | Supercharged carbon dioxide refrigerating system |
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Application publication date: 20161207 |
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