CN106839488A - Thermoelectricity subcooler expanding machine joint auxiliary supercooling CO2Transcritical cooling system - Google Patents

Thermoelectricity subcooler expanding machine joint auxiliary supercooling CO2Transcritical cooling system Download PDF

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Publication number
CN106839488A
CN106839488A CN201710192084.7A CN201710192084A CN106839488A CN 106839488 A CN106839488 A CN 106839488A CN 201710192084 A CN201710192084 A CN 201710192084A CN 106839488 A CN106839488 A CN 106839488A
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CN
China
Prior art keywords
expanding machine
thermoelectricity subcooler
compressor
thermoelectricity
subcooler
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Application number
CN201710192084.7A
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Chinese (zh)
Inventor
代宝民
刘圣春
卢芬平
姜文玲
孟憧景
盛杰
崔志杰
李正
陈启
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天津商业大学
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Priority to CN201710192084.7A priority Critical patent/CN106839488A/en
Publication of CN106839488A publication Critical patent/CN106839488A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B40/00Subcoolers, desuperheaters or superheaters
    • F25B40/02Subcoolers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements, e.g. for transferring liquid from evaporator to boiler
    • F25B41/06Flow restrictors, e.g. capillary tubes; Disposition thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B9/00Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2309/00Gas cycle refrigeration machines
    • F25B2309/06Compression machines, plant or systems characterised by the refrigerant being carbon dioxide
    • F25B2309/061Compression machines, plant or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies
    • Y02B30/72Electric or electronic refrigerant flow control

Abstract

The present invention relates to a kind of thermoelectricity subcooler expanding machine joint auxiliary supercooling CO2Transcritical cooling system, including compressor, evaporator, gas cooler, expanding machine and thermoelectricity subcooler, the compressor connects gas cooler, and the gas cooler connects thermoelectricity subcooler, and the thermoelectricity subcooler leads to and connects expanding machine, the expanding machine connection institute evaporator, the evaporator is connected with compressor, and the expanding machine connects power supervisor, and the power supervisor connects compressor and thermoelectricity subcooler by power supply circuit.The present invention replaces traditional choke valve can effectively to recover CO with expanding machine2Sizable restriction loss, supercritical CO in trans critical cycle2Fluid entered the external expansion work output electric energy of expanding machine, can be used to drive thermoelectricity subcooler to improve CO2Degree of supercooling, unnecessary electric energy can be supplied to compressor and use, reducing energy consumption;Two processes are cooperated more than, can effectively improve the utilization of energy and whole CO2The efficiency of transcritical cooling system.

Description

Thermoelectricity subcooler-expanding machine joint auxiliary supercooling CO2Transcritical cooling system

Technical field

The present invention relates to CO2Kind of refrigeration cycle technical field, more particularly to a kind of thermoelectricity subcooler and expanding machine joint auxiliary Supercooling CO2Transcritical cooling system.

Background technology

With the development of science and technology and society, the utilization of resources and environmental protection problem are increasingly noted by people.In refrigeration Eliminated due to having a significant impact to depletion of the ozone layer and greenhouse effects with widely used CFCs, HCFCs in heat pump assembly, Replace conventional refrigerants using HFCs class refrigerants one after another.It is existing《The Kyoto Protocol》List HFCs in greenhouse gases lists, the whole world Each state is all carrying forward vigorously work of the environmental protection refrigerant instead of high GWP refrigerant.CO2As a kind of environmentally friendly working medium, with Its plurality of advantages receives the concern of people again.1)、CO2To environment without destruction (ODP=0, GWP=1), 2) unit bodies Product refrigerating capacity is big, advantageously reduces equipment volume, 3), carbon dioxide viscosity it is low, its flow losses is small, heat-transfer effect is good, 4) change Learn property very stable etc..

But, CO2Some problems are still suffered from as invention refrigerant.CO2Critical-temperature be 31.1 DEG C, critical pressure is high Up to 7.38MPa, the operating pressure of system is very high.CO2Trans-critical cycle kind of refrigeration cycle is generally used for cryogenic refrigeration and super low temperature refrigeration, by In the limitation of outdoor temperature condition, gas cooler exit temperature is higher, slightly above environment temperature, restriction loss than larger, Cause the inefficient of whole system.

Therefore need it is proposed that a kind of scheme is to CO2Refrigeration system is improved, so as to increase substantially the effect of system Rate.

The content of the invention

Supercooling CO is aided in present invention aim at proposing that a kind of thermoelectricity subcooler-expanding machine is combined2Transcritical cooling system.

In order to solve problem above, scheme proposed by the invention is:

A kind of thermoelectricity subcooler-expanding machine joint auxiliary supercooling CO2Transcritical cooling system, including compressor, evaporator, Gas cooler, also including expanding machine and thermoelectricity subcooler, the compressor connects gas cooler by the first pipeline, is used for The supercritical CO for being formed will be compressed2Fluid sends into the gas cooler, and the gas cooler connects heat by the second pipeline Electric subcooler, for the supercritical CO2Thermoelectricity subcooler is sent to after fluid heat release, it is cold from gas by the thermoelectricity subcooler But the CO that device is exported2Heat is absorbed in fluid, is realized to CO2The supercooling of fluid, output cryogenic high pressure CO2Gas;The thermoelectricity mistake Cooler connects expanding machine by the 3rd pipeline, for by the cryogenic high pressure CO2Gas is sent to expanding machine, by the expanding machine pair Outer expansion work exports electric energy and low-temp low-pressure two-phase CO2Fluid is sent to the evaporation that the expanding machine is connected by the 4th pipeline Device, the evaporator is connected by the 5th pipeline with compressor, for by the gas-liquid two-phase CO after heat absorption2Fluid sends into the pressure Contracting machine is compressed and is processed into the supercritical CO2Fluid;The expanding machine connects power supervisor, and the power supervisor leads to Power supply circuit connection compressor and thermoelectricity subcooler are crossed, the power supervisor is used for the electric energy energy storage for forming expanding machine Deposit and realize that electric energy is distributed, to drive thermoelectricity subcooler, or unnecessary electric energy is supplied into compressor.

The thermoelectricity subcooler includes thermoelectric cooling module, and the upper side of the thermoelectric cooling module is fitted with carbon dioxide Pipeline, the downside of the thermoelectric cooling module is fitted with wind-cooling heat dissipating module or water-cooling radiating module, the carbon dioxide pipe Road is connected with second pipeline with the 3rd pipeline respectively.

The carbon dioxide pipeline uses porous flat pipe.

The porous flat pipe is made using aluminium material.

In CO2In transcritical cooling system, the CO of gas-liquid two-phase2After fluid absorbs heat from evaporator, into compressor air suction End, is supercritical CO by compressor compresses2Fluid, afterwards into gas cooler to surrounding environment heat release, now CO2Fluid Exothermic temperature is slightly above environment temperature, and then fluid is further cooled to cryogenic high pressure CO into thermoelectricity subcooler2Fluid, passes through Expanding machine is changed into the gas-liquid two-phase fluid of low-temp low-pressure after externally doing work, until absorbing heat into evaporator, complete whole system SAPMAC method.

In addition, CO2When by expanding machine, externally acting is changed into the gas-liquid two-phase fluid of low-temp low-pressure to supercritical fluid, Output electrical power storage is in power supervisor simultaneously.Reasonable distribution is carried out to the electric energy that expanding machine is exported by power supervisor, The electric energy of such as expanding machine output can drive the thermoelectricity subcooler, unnecessary electricity can to distribute for driving compressor, otherwise The electricity of deficiency can then be supplemented.Three cooperation is increased operation rate and performance.

The present invention has the advantages and positive effects that:

1)、CO2In kind of refrigeration cycle, CO2The operating pressure of fluid is high, replaces traditional choke valve effective with expanding machine Recover CO2Sizable restriction loss in trans critical cycle.

2), supercritical CO2Fluid entered the external expansion work output electric energy of expanding machine, can be used for driving thermoelectricity subcooler Improve CO2Degree of supercooling, unnecessary electric energy can be supplied to compressor and use, reducing energy consumption.

3), cooperating by two above process, can effectively improve the utilization of energy and whole CO2Trans-critical cycle The efficiency of refrigeration system.

Brief description of the drawings

Fig. 1 is thermoelectricity subcooler of the invention-expanding machine joint auxiliary supercooling CO2The schematic diagram of transcritical cooling system;

Fig. 2 is a kind of structural representation of thermoelectricity subcooler that the present invention is provided;

Fig. 3 is the structural representation of another thermoelectricity subcooler that the present invention is provided;

In figure:1st, compressor;2nd, gas cooler;3rd, expanding machine;4th, evaporator;5th, thermoelectricity subcooler;6th, power management Device.

Specific embodiment

As shown in figure 1, a kind of thermoelectricity subcooler-expanding machine joint auxiliary supercooling CO2Transcritical cooling system, including compression Machine 1, evaporator 4, gas cooler 2, also include expanding machine 3 and thermoelectricity subcooler 5, wherein, the compressor 1 passes through first Pipeline connect gas cooler 2, for by compress formed it is overcritical (temperature be 50 DEG C~150 DEG C, pressure be 7.5Mpa~ 14Mpa)CO2Fluid sends into the gas cooler 2, and the gas cooler 2 connects thermoelectricity subcooler 5 by the second pipeline, For to the supercritical CO2(temperature is 30 DEG C~45 DEG C after heat release, and pressure is 7.5Mpa~14Mpa) is sent to after fluid heat release Thermoelectricity subcooler 5, the thermoelectricity subcooler 5 is used for the CO from the outlet of gas cooler 22Heat is absorbed in fluid, is realized to CO2 The supercooling of fluid, output cryogenic high pressure (temperature is -20 DEG C~10 DEG C, and pressure is 7.5Mpa~14Mpa) CO2Gas;The heat Electric subcooler 5 connects expanding machine 3 by the 3rd pipeline, for by the cryogenic high pressure CO2Gas is sent to expanding machine 3, by described The external expansion work of expanding machine 3 exports electric energy and low-temp low-pressure (temperature is -5 DEG C~-20 DEG C, and pressure is 2Mpa~4.5Mpa) Two-phase CO2Fluid is sent to the evaporator 4 that the expanding machine 3 is connected by the 4th pipeline, the evaporator 4 by the 5th pipeline with The CO of compressor 12Entrance connect, for by after heat absorption low-temp low-pressure (temperature be -20 DEG C~10 DEG C, pressure be 2Mpa~ 4.5Mpa) gas-liquid two-phase CO2The fluid feeding compressor 1 is compressed and is processed into the supercritical CO2Fluid.

Wherein, the expanding machine comes with generator, and power supervisor 6, the power supply are connected by described generator Manager 6 is connected to compressor 1 and thermoelectricity subcooler 5 by power supply circuit, and power supervisor 6 is used for expanding machine and generating Electric energy energy storage that machine is formed simultaneously realizes the distribution of electric energy, for driving thermoelectricity subcooler, or unnecessary electric energy is supplied into pressure Contracting machine is used, and is prior art device, can directly purchase the power supervisor assembling of corresponding generating on the market.

It should be noted that in the present invention, the expanding machine connects power supervisor 6, the power supply pipe by generator Reason device 6 by power supply circuit distribute electric energy arrive to compressor 1 and thermoelectricity subcooler 5 be it is existing known in expanding machine and generator Generating electric power supply control system, can be realized using existing known technology and circuit structure, this is no longer carried out detailed Illustrate the circuit structure for generating electricity and powering.

Due to CO2Refrigeration system operating pressure is high, therefore uses expanding machine instead of quite big in choke valve recovery throttling process Loss, while CO2Fluid expansion acting generating drives the CO that thermoelectricity subcooler is exported to gas cooler2The further mistake of fluid It is cold, exothermic temperature is dropped to below environment temperature, refrigerating capacity is improved, moreover it is possible to reducing energy consumption, lifts CO2The property of refrigeration system Energy

The thermoelectricity subcooler is the semiconductor cooling device based on peltier effect, is powered and freeze.The thermoelectricity mistake Cooler includes thermoelectric cooling module, and the upper side of the thermoelectric cooling module is fitted with carbon dioxide pipeline, the thermoelectric-cooled The downside of module is fitted with heat abstractor, and the heat abstractor can be wind-cooling heat dissipating module or water-cooling radiating module, described Carbon dioxide pipeline is connected with second pipeline with the 3rd pipeline respectively.

Fig. 2 shows a kind of structure of the thermoelectricity subcooler, including thermoelectric cooling module 51, the thermoelectric cooling module Upper side is fitted with carbon dioxide pipeline 52, and the downside of the thermoelectric cooling module is fitted with wind-cooling heat dissipating module, wherein, institute Stating wind-cooling heat dissipating module includes air-cooled heat sink 4 and is located at the fan 3 of the air-cooled heat sink lower section.

The thermoelectric cooling module 1 is made up of some to thermocouple N, P, connects supply unit 54, is prior art construction. Effect is pasted according to pal, when electric current flows through thermoelectric cooling module, refrigeration effect is produced in the cold end of thermoelectric cooling module, in thermoelectricity Other one section of refrigerating module heats effect.

Wherein, the carbon dioxide pipeline uses porous flat pipe.The porous flat pipe is made using aluminium material.Preferably, The CO2The carbon dioxide pipe of thermoelectricity subcooler uses porous flat pipe, and the hydraulic diameter of porous flat pipe is smaller, therefore its pressure-bearing energy Power is greatly improved.Such structure also has the heat exchanger channels wall of an advantage, i.e. carbon dioxide pipe can be with thermoelectric-cooled mould The thermoelectric slice of block is brought into close contact, and passage is difficult to laminating if round.

Wherein, described porous flat pipe is micro-channel flat, and its internal axial direction has multiple apertures being evenly arranged Small coolant channel, interchannel is mutually closed, and can be made using aluminium material.

Wherein, described fan 53 and air-cooled heat sink 54 is for helping maintain steady temperature, thermoelectricity being flowed through in electric current During module 51, due to paltie effect, the heat of carbon dioxide in meeting absorbing carbon dioxide pipeline 52, so as to realize carbon dioxide Supercooling.The carbon dioxide pipeline 52 is used for CO2Flowed into from one end 521, flowed out to the other end 522.

Fig. 3 shows the structure of another thermoelectricity subcooler, including thermoelectric cooling module 51, the upside of the thermoelectric cooling module Face is fitted with carbon dioxide pipeline 52, and the downside of the thermoelectric cooling module is fitted with water-cooling radiating module 53.

The thermoelectric cooling module is made up of some to thermocouple N, P, connects supply unit 50, is prior art construction. Effect is pasted according to pal, when electric current flows through thermoelectric cooling module, refrigeration effect is produced in the cold end of thermoelectric cooling module, in thermoelectricity Other one section of refrigerating module heats effect.

As described in Example 1, the carbon dioxide pipeline is equally provided with using porous flat pipe, the i.e. even tube wall in flat tube Micropore.The flat tube can be made using aluminium material.

Wherein, the water-cooling radiating module is water-cooled pipeline, water inlet 531 and delivery port 532 with recirculated cooling water, Realize that cooling water circulation is conveyed.

Wherein, the water-cooling radiating module 2 can ensure its temperature constant state, when electric current flows through thermoelectric cooling module 1, by The heat of carbon dioxide in paltie effect, meeting absorbing carbon dioxide pipeline, so as to realize the supercooling of carbon dioxide.

In the present embodiment, the operation principle of the CO2 Trans-critical cycle systems of the thermoelectricity subcooler-expanding machine joint auxiliary supercooling It is:

First stage:Gas-liquid two-phase CO2Fluid enters the boil down to supercritical fluid of compressor 1 from after the heat absorption of evaporator 4, so Enter gas cooler 2 afterwards to surrounding environment heat release, now postcritical CO2The temperature of fluid is slightly above environment temperature.

Second stage:The CO that thermoelectricity subcooler 5 is exported from gas cooler 22Heat is absorbed in fluid, is realized to CO2Fluid Supercooling, now CO2It is the gas of cryogenic high pressure.

Phase III:The gas of cryogenic high pressure enters into expanding machine 3, and external expansion work exports electric energy, is stored in power supply In manager 6, the distribution of electric energy is coordinated by power supervisor, for driving thermoelectricity subcooler, or share a part of compressor Electric energy input.

Fourth stage:Evaporator is again introduced into from the low-temp low-pressure two-phase fluid out of expanding machine 3 and absorbs heat, so that complete Into the circulation of whole system.

Described CO2In Trans-critical cycle kind of refrigeration cycle, expanding machine used is prior art device, and the thermoelectricity subcooler is adopted Use CO2Thermoelectricity subcooler.

Wherein, the CO of the low-temp low-pressure2Two-phase fluid absorbs heat into evaporator and faces for super subsequently into compressor compresses Boundary CO2Fluid, subsequently enters gas cooler and is exchanged heat to surrounding environment, the CO of now gas cooler outlet2Temperature is slightly above ring Border temperature.

The CO of the slightly above high pressure of environment temperature that thermoelectricity subcooler exports out to gas cooler2The further mistake of fluid It is cold, make the CO of cryogenic high pressure2Gas.

The CO of cryogenic high pressure2Gas enters expanding machine, and expanding machine externally does work output electric energy, and energy storage is in power management In device, the distribution of electric energy is realized by power supervisor, for driving thermoelectricity subcooler, unnecessary electric energy can supply compressor to be made With.

From the CO of expanding machine low-temp low-pressure out2Two-phase fluid is again introduced into evaporator heat absorption, so as to complete whole system SAPMAC method.

A part of work(reclaimed using expanding machine exports electric energy, for the CO for driving thermoelectricity subcooler to export air cooler2 Fluid is further subcooled, and exothermic temperature is reduced to below environment temperature, and refrigerating capacity is improved, while unnecessary electric energy can be for Used to compressor, effective reducing energy consumption.In sum, CO2The efficiency of Trans-critical cycle system can significantly be improved.

The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (4)

1. a kind of thermoelectricity subcooler-expanding machine joint auxiliary is subcooled CO2Transcritical cooling system, including compressor, evaporator, gas Body cooler, it is characterised in that also including expanding machine and thermoelectricity subcooler, it is cold that the compressor connects gas by the first pipeline But device, for the supercritical CO for being formed will to be compressed2Fluid sends into the gas cooler, and the gas cooler is by the second pipe Road connects thermoelectricity subcooler, for the supercritical CO2Thermoelectricity subcooler is sent to after fluid heat release, by the thermoelectricity subcooler From the CO of gas cooler outlet2Heat is absorbed in fluid, is realized to CO2The supercooling of fluid, output cryogenic high pressure CO2Gas;Institute State thermoelectricity subcooler and expanding machine is connected by the 3rd pipeline, for by the cryogenic high pressure CO2Gas is sent to expanding machine, by described External expansion work output electric energy and the low-temp low-pressure two-phase CO of expanding machine2Fluid is sent to and connects the expanding machine by the 4th pipeline Evaporator, the evaporator is connected by the 5th pipeline with compressor, for by the gas-liquid two-phase CO after heat absorption2Fluid is sent into The compressor is compressed and is processed into the supercritical CO2Fluid;The expanding machine connects power supervisor, the power supply pipe Reason device connects compressor and thermoelectricity subcooler by power supply circuit, and the power supervisor is used for the electric energy for forming expanding machine Energy storage simultaneously realizes that electric energy is distributed, and to drive thermoelectricity subcooler, or unnecessary electric energy is supplied into compressor.
2. thermoelectricity subcooler-expanding machine joint auxiliary is subcooled CO according to claim 12Transcritical cooling system, its feature exists In, the thermoelectricity subcooler includes thermoelectric cooling module, and the upper side of the thermoelectric cooling module is fitted with carbon dioxide pipeline, The downside of the thermoelectric cooling module is fitted with wind-cooling heat dissipating module or water-cooling radiating module, the carbon dioxide pipeline difference It is connected with the 3rd pipeline with second pipeline.
3. thermoelectricity subcooler-expanding machine joint auxiliary is subcooled CO according to claim 22Transcritical cooling system, its feature exists In the carbon dioxide pipeline uses porous flat pipe.
4. thermoelectricity subcooler-expanding machine joint auxiliary is subcooled CO according to claim 32Transcritical cooling system, its feature exists In the porous flat pipe is made using aluminium material.
CN201710192084.7A 2017-03-28 2017-03-28 Thermoelectricity subcooler expanding machine joint auxiliary supercooling CO2Transcritical cooling system CN106839488A (en)

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CN107246746A (en) * 2017-07-21 2017-10-13 天津商业大学 A kind of CO being subcooled based on waste heat2Automotive air-conditioning system
CN107351645A (en) * 2017-07-21 2017-11-17 天津商业大学 A kind of CO for combining auxiliary supercooling based on waste heat overbottom pressure2Automotive air-conditioning system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107246746A (en) * 2017-07-21 2017-10-13 天津商业大学 A kind of CO being subcooled based on waste heat2Automotive air-conditioning system
CN107351645A (en) * 2017-07-21 2017-11-17 天津商业大学 A kind of CO for combining auxiliary supercooling based on waste heat overbottom pressure2Automotive air-conditioning system

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Application publication date: 20170613