KR20150076775A - Dual refrigerating system - Google Patents

Dual refrigerating system Download PDF

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Publication number
KR20150076775A
KR20150076775A KR1020130165344A KR20130165344A KR20150076775A KR 20150076775 A KR20150076775 A KR 20150076775A KR 1020130165344 A KR1020130165344 A KR 1020130165344A KR 20130165344 A KR20130165344 A KR 20130165344A KR 20150076775 A KR20150076775 A KR 20150076775A
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KR
South Korea
Prior art keywords
refrigerant
condenser
compressor
refrigerator
temperature
Prior art date
Application number
KR1020130165344A
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Korean (ko)
Inventor
구학근
정영록
Original Assignee
동명대학교산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to KR1020130165344A priority Critical patent/KR20150076775A/en
Publication of KR20150076775A publication Critical patent/KR20150076775A/en

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    • 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
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/003Filters
    • 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
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • 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
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B7/00Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
    • 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, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/10Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point with several cooling stages
    • 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
    • F25B2400/00General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07Details of compressors or related parts
    • F25B2400/072Intercoolers therefor

Abstract

[0001] The present invention relates to a dual refrigeration system, and more particularly to a dual refrigerating system comprising a first compressor, a first condenser, a first receiver, a first filter drier, a first expansion valve, And a second evaporator, a second evaporator, a second evaporator, a second condenser, a second receiver, a second filter drier, a second expansion valve, and a second evaporator, A pressure temperature regulator is further installed on the second compressor outlet side of the second refrigerating machine so as to prevent a decrease in efficiency due to a sudden increase in pressure and to eliminate the load of the first compressor of the first refrigerating machine And a subcooler is additionally provided between the pressure temperature regulator and the second condenser so that the refrigerant is primarily cooled by cooling the refrigerant flowing into the second condenser, Out The temperature and pressure of the compressor are rapidly increased at the outlet of the compressor of the second refrigerator to prevent the refrigerator efficiency from dropping and the load of the compressor of the first refrigerator can be removed, And a subcooler between the temperature regulator and the second condenser of the second refrigerator, so that the refrigerant introduced into the second condenser is first cooled and introduced, thereby realizing a cryogenic refrigeration cycle.

Description

[0002] Dual refrigerating system [0003]

The present invention relates to a two-way refrigeration system, and more particularly, to a two-way refrigeration system that can be installed in a mechanical manner without any restriction on location, can be realized at an extremely low temperature, Wherein ammonia is used as a refrigerant on the side of the first refrigerator, carbon dioxide is used as a refrigerant on the side of the second refrigerator, and pressure and temperature regulators are further provided on the compressor outlet side of the second refrigerator, It is possible to prevent the refrigerator efficiency from dropping due to a sudden rise in temperature or pressure at the compressor outlet of the car refrigerator and to remove the load of the compressor on the side of the first refrigerator and to reduce the load on the side of the compressor between the pressure and temperature regulator and the second condenser of the second refrigerator So that the refrigerant introduced into the second condenser is first cooled to be introduced into the second condenser The present invention relates to a two-way refrigeration system capable of realizing a cryogenic refrigeration cycle.

Generally, a freezer is a device that performs a mechanical operation or absorbs heat to cool a sealed container to a temperature lower than its surrounding temperature, and serves as a heat pump for moving heat toward a low temperature in the freezer, The operating fluid that conveys heat is called a refrigerant.

Such a refrigerator includes a compressor, a condenser, an expansion valve, an evaporator, and a pipe connecting the refrigerant to circulate the refrigerant. The cycle in which the refrigerant is refined by the compressor, the condenser, the expansion valve, and the evaporator along the pipe is called a cycle.

The two-way refrigeration system, which is a refrigeration system for a refrigerator in which two refrigerators are used in combination, is a high-temperature one-side refrigerator that processes a refrigeration load at an ultra-low temperature and a high-temperature one-side refrigerator that processes a condensation load of a low- Separated system.

In other words, the refrigerator is not condensed by water or air, but by another refrigerator.

This dual-refrigerating system can be used in an ultra-low temperature region because it has an advantage of being able to easily obtain an ultra-low temperature when the condensation temperature is low and the high-pressure refrigerant is used. Condensation of the high-temperature single-side refrigerating machine condenses with general air or water, The condenser of the high temperature side is combined with the evaporator of the high temperature side.

Since the low-temperature refrigerant is a high-pressure refrigerant, the binary refrigeration system is characterized in that an expansion valve is provided to maintain the pressure in the system at an appropriate pressure during operation stoppage.

FIG. 1 is a schematic view of a conventional two-way refrigeration system in which a Chlorinate-fluorocarbon (CFC) system and a Hydrofluorocarbon (HCFC) system such as R-22 and R- chloro-fluoro-carbon based refrigerant, wherein the first-side refrigerators and the second-side refrigerators are arranged in two rows, the first-side refrigerators are R-22 refrigerants, and the second- The refrigerant of R-23 is used.

Specifically, in the conventional two-way refrigeration system, the primary refrigerating machine (high-temperature side or high-pressure side) includes R-22 refrigerant and includes a compressor 11 for compressing the refrigerant to be sucked and liquefied at a relatively high temperature, , A condenser (12) for removing heat from the refrigerant to condense it, a receiver (13) for receiving refrigerant, a filter drier (14), a condenser (12) for easily evaporating the refrigerant liquid at a relatively high temperature And an evaporator 15 which evaporates heat from the low-temperature and low-pressure refrigerant liquid discharged from the expansion valve 15 and evaporates the evaporated refrigerant, thereby reducing the pressure of the refrigerant discharged from the evaporator 15, And a cascade heat exchanger (30).

The refrigeration cycle of the primary side refrigerator is the most typical refrigeration cycle of the related art, and the cascade heat exchanger 30 is heat exchanged with the condenser on the low pressure side, which will be described later.

The secondary side refrigerator (low-temperature side or low-pressure side) includes R-23 refrigerant, a compressor (21) for compressing the refrigerant to suck up the refrigerant to be liquefied at a relatively high temperature, A cascade heat exchanger 30 serving as a condenser, a receiver 23 for receiving a refrigerant, a filter drier 24, a cooler for removing refrigerant from the cascade heat exchanger 30 to easily evaporate the refrigerant liquid at a relatively high temperature, And an ultra-low temperature evaporator 26 for evaporating heat from the low-temperature and low-pressure refrigerant liquid discharged from the expansion valve 25 to vaporize the refrigerant liquid. .

In the secondary refrigerator, the cascade heat exchanger 30 functions as an evaporator in a high-pressure side refrigeration cycle and serves as a condenser in a low-pressure side refrigeration cycle.

1, reference numerals 17, 22, and 27 denote solenoid valves, reference numeral 28 denotes a high-pressure tank, and reference numeral 29 denotes an expansion valve. In the conventional two-way refrigeration system shown in FIG.

As described above, the conventional two-way refrigeration system uses refrigerants such as R-22 and R-23. However, due to the ozone layer destruction problem, the use of CFC refrigerant is prohibited, HCFC and HFC refrigerants are also suffering from global warming.

In recent years, there has been a growing interest in the use of natural refrigerants, which are environmentally friendly and have excellent thermal properties.

Korean Patent Laid-Open No. 10-2004-0053695 2004.06.24 Open

In order to solve the above problems, the present invention provides a refrigerator which prevents the refrigerator efficiency from dropping due to a sudden rise in temperature or pressure at the outlet of the second compressor of the second refrigerator, And to provide a two-way refrigeration system capable of cooling the refrigerator.

Another object of the present invention is to provide a cryogenic refrigeration cycle in which the refrigerant introduced into the second condenser is first cooled and then introduced into the refrigerator.

The present invention for achieving the above-mentioned objects is as follows. That is, the two-way refrigeration system according to the present invention comprises a first compressor for compressing the refrigerant to a high temperature and a high pressure, a first condenser for condensing the refrigerant of high temperature and high pressure compressed by the first compressor to a low temperature and high pressure, A first filter dryer for temporarily storing low-temperature high-pressure refrigerant condensed through a condenser, a first filter dryer for removing moisture contained in the refrigerant contained in the first receiver, A first expansion valve for controlling the flow rate of the refrigerant to be evaporated by evaporating the low temperature and high pressure refrigerant liquid contained in the receiver, and a first evaporator for vaporizing the refrigerant by heat exchange from the refrigerant liquid from the first expansion valve A primary refrigerator comprising: A second compressor for compressing the refrigerant at a high temperature and a high pressure, a second condenser for condensing the high temperature and high pressure refrigerant compressed by the second compressor to a low temperature and a high pressure, A second filter drier for removing moisture contained in the refrigerant contained in the second receiver, and a second filter drier for temporarily storing the refrigerant at a low temperature and pressure contained in the second receiver via the second condenser, And a second evaporator for evaporating the liquid to lower the pressure of the refrigerant and adjusting the flow rate of the refrigerant, and a second evaporator for evaporating the refrigerant by heat exchange with the outside from the refrigerant liquid from the second expansion valve In the dual refrigeration system, the refrigerant of the first refrigerator is applied as ammonia, the refrigerant of the second refrigerator is applied as carbon dioxide, The second refrigerator is provided with a second compressor for preventing a decrease in efficiency due to a sudden increase in temperature or pressure at an outlet of the second compressor and for removing a load of the first compressor of the first refrigerator, And a pressure temperature controller is further provided on the second compressor outlet side of the second compressor.

Preferably, a subcooler is additionally provided between the pressure thermostat and the second condenser so that the refrigerant is primarily cooled by cooling the refrigerant flowing into the second condenser, and is cooled and introduced.

At this time, the first evaporator and the second condenser are preferably installed inside the cascade heat exchanger.

Furthermore, the cascade heat exchanger is preferably applied as a heat insulating box type.

On the other hand, a fluid separator may be further provided between the subcooler and the second condenser.

The effect of the binary refrigeration system according to the present invention is as follows.

First, by further including a pressure temperature regulator on the outlet side of the second compressor of the second refrigerator, the temperature or pressure of the second compressor is rapidly increased at the outlet of the second refrigerator to prevent the refrigerator efficiency from dropping, The load of the first compressor of the first compressor can be removed.

Secondly, a subcooler is additionally provided between the pressure thermostat and the second condenser of the second refrigerator, so that the refrigerant introduced into the second condenser is first cooled and introduced, thereby realizing a cryogenic refrigeration cycle.

1 is a schematic diagram of a conventional binary refrigeration system;
Figure 2 is an illustration of a binary refrigeration system in accordance with the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a dual cooling system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is an exemplary view showing a binary refrigeration system according to the present invention. FIG.

As shown in FIG. 2, the dual refrigeration system according to the preferred embodiment of the present invention roughly includes: a first refrigerator 100 constituting a high temperature and high pressure refrigeration cycle; a second refrigerator 100 forming a low temperature and low pressure refrigeration cycle; And a refrigerator (200).

The first refrigerator (100) comprises a first compressor (110) for compressing the refrigerant to a high temperature and a high pressure, a second condenser (110) for condensing the high temperature high pressure refrigerant compressed by the first compressor 1 condenser 120, a first receiver 130 for temporarily storing low-temperature and high-pressure refrigerant condensed through the first condenser 120, and a second receiver 130 for storing the refrigerant contained in the refrigerant received in the first receiver 130 A first filter dryer 140 for removing moisture from the refrigerant; and a low-temperature and high-pressure refrigerant liquid accommodated in the first receiver 130 via the first condenser 120 to evaporate the refrigerant, And a first evaporator 160 for exchanging heat with the outside from the refrigerant discharged from the first expansion valve 150 to vaporize the refrigerant.

Here, the first receiver 130 temporarily stores the refrigerant liquefied in the first condenser 120, and is preferably provided in a sufficient capacity to supply and store the refrigerant according to the change of the refrigeration load of the refrigerator. will be.

The first receiver (130) can collect the refrigerant in the first receiver (130) when the first compressor (110) is stopped. Accordingly, when a failure occurs in the refrigerator, the first compressor So that the refrigerator can be easily maintained while the refrigerant is stably stored in the first receiver (130).

Further, in the first refrigerator 100 having the above-described structure, it is preferable that the refrigerant is applied as ammonia.

The second refrigerator 200 includes a second compressor 210 for compressing the refrigerant to a high temperature and a high pressure, a second compressor 210 for condensing the refrigerant of high temperature and high pressure compressed by the second compressor 210 to low temperature and high pressure, 2 condenser 220, a second receiver 230 for temporarily storing low-temperature and high-pressure refrigerant condensed through the second condenser 220, A second filter dryer 240 for removing moisture from the refrigerant; and a low-temperature and high-pressure refrigerant liquid accommodated in the second receiver 230 via the second condenser 220 to evaporate the low- And a second evaporator 260 for vaporizing the refrigerant by heat exchange with the outside from the refrigerant liquid discharged from the second expansion valve 250.

Here, the second receiver 230 temporarily stores liquefied refrigerant in the second condenser 220, and is preferably provided in a sufficient capacity to supply and store the refrigerant according to a change in refrigerating load of the refrigerator. will be.

In addition, the second receiver (230) can collect the refrigerant in the second receiver (230) when the second compressor (210) is stopped. Accordingly, when a failure occurs in the refrigerator, So that the refrigerator can be easily maintained while the refrigerant is stably stored in the second receiver (230).

Further, in the second refrigerator 200 constructed as described above, it is preferable that the refrigerant is applied as carbon dioxide.

A pressure temperature controller 270 is further provided at the outlet of the second compressor 210 of the second refrigerator 200 so that the refrigerant discharged from the second compressor 200 through the second compressor 210, It is possible to prevent the efficiency or the efficiency from dropping due to the sudden increase in temperature or pressure at the outlet of the first refrigerator 100 and to remove the load of the first compressor 110 of the first refrigerator 100.

In addition, the two-way refrigeration system according to the present invention as described above is configured so that the pressure temperature regulator 270, the second condenser 220, and the second condenser 220 are controlled so that the refrigerant is primarily cooled by cooling the refrigerant flowing into the second condenser 220, And a sub-cooler 280 is further provided between the sub-cooler 220.

As described above, since the subcooler 280 is additionally provided, the refrigerant flowing into the second condenser 220 can be primarily cooled and introduced, thereby realizing a cryogenic refrigeration cycle.

Meanwhile, in the two-way refrigeration system according to the present invention, the first evaporator 160 and the second condenser 220 are installed together in the cascade heat exchanger 300.

In this case, the cascade heat exchanger 300 is preferably applied as a heat insulation box type. Further, it is preferable that a oil separator 290 is additionally installed between the subcooler 280 and the second condenser 220.

Here, the oil separator 290 separates the oil, that is, separates the lubricating oil, which is mixed into the refrigerant in the particulate state, in the second compressor 210 so as not to flow into the second condenser 220 side.

That is, when the lubricating oil mixed in the particulate state is contained in the refrigerant and flows into the second condenser 220, an oil film is formed on the cooling pipe to deteriorate the thermoelectric state, and in the worst case, .

Therefore, the oil separator 290 can separate and remove the particulate lubricant contained in the refrigerant flowing into the second condenser 220, and through the second separator 220, It is possible to maintain a good heat-transfer state with respect to the cooling pipe of the heat exchanger.

According to the dual refrigeration system of the present invention as described above, the pressure refrigerator 200 further includes the pressure temperature controller 270 at the outlet of the second compressor 210 of the second refrigerator 200, The temperature or pressure at the outlet of the second compressor 210 of the first compressor 100 is increased so that the refrigerator efficiency is prevented from being lowered and the load of the first compressor 110 of the first refrigerant compressor 100 can be removed .

The auxiliary cooler 280 is further provided between the pressure thermostat 270 and the second condenser 220 of the second refrigerator 200 so that the refrigerant flowing into the second condenser 220 is supplied to the first condenser 220, It is possible to realize a cryogenic refrigeration cycle at a very low temperature.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, the invention is not limited thereto. Various modifications may be made by those skilled in the art. Are included in the scope of the present invention.

100: First freezer
110: first compressor 120: first condenser
130: first receiver 140: first filter dryer
150: first expansion valve 160: first evaporator
200: Secondary refrigerator
210: second compressor 220: second condenser
230: Second Receiver 240: Second Filter Dryer
250: second expansion valve 260: second evaporator
270: Pressure thermostat 280: Subcooler
290: oil separator
300: Cascade heat exchanger

Claims (5)

A first condenser (120) for condensing the high temperature and high pressure refrigerant compressed by the first compressor (110) to a low temperature and a high pressure; a second condenser A first filter dryer 130 for temporarily storing low temperature and high pressure refrigerant condensed through the first filter 120, a first filter dryer 130 for removing moisture contained in the refrigerant contained in the first receiver 130 A first expansion valve (150) for evaporating low temperature and high pressure refrigerant contained in the first receiver (130) via the first condenser (120) to lower the pressure and adjusting the refrigerant flow rate; A first refrigerator (100) comprising a first evaporator (160) for exchanging heat with the outside from the refrigerant discharged from the first expansion valve (150) to vaporize the refrigerant; A second compressor (210) for compressing the refrigerant to a high temperature and a high pressure, a second condenser (220) for condensing the high temperature and high pressure refrigerant compressed by the second compressor (210) to a low temperature and a high pressure, A second filter dryer 230 for temporarily storing low temperature and high pressure refrigerant condensed through the condenser 220, a second filter dryer 230 for removing moisture contained in the refrigerant contained in the second receiver 230, A second expansion valve 250 for controlling the flow rate of refrigerant by evaporating low temperature and high pressure refrigerant liquid stored in the second receiver 230 via the second condenser 220, And a second evaporator (260) for evaporating the refrigerant by heat exchange with the outside from the refrigerant discharged from the second expansion valve (250), the second refrigerator (200)
The refrigerant of the first refrigerator (100) is applied as ammonia, the refrigerant of the second refrigerator (200) is applied as carbon dioxide,
The temperature of the outlet of the second compressor 200 is prevented from being lowered due to a sudden increase in temperature or pressure, and the efficiency of the first compressor < RTI ID = 0.0 > Wherein a pressure temperature regulator (270) is further installed on the outlet side of the second compressor (210) of the second refrigerator (200) so as to remove the load of the second refrigerator (200).
The method according to claim 1,
A subcooler 280 is additionally installed between the pressure temperature regulator 270 and the second condenser 220 so that the refrigerant is primarily cooled by cooling the refrigerant flowing into the second condenser 220, Features dual refrigeration system.
3. The method of claim 2,
Wherein the first evaporator (160) and the second condenser (220) are installed together inside the cascade heat exchanger (300).
The method of claim 3,
Wherein the cascade heat exchanger (300) is applied as a heat insulation box type.
3. The method of claim 2,
And a fluid separator (290) is further provided between the subcooler (280) and the second condenser (220).
KR1020130165344A 2013-12-27 2013-12-27 Dual refrigerating system KR20150076775A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106016802A (en) * 2016-07-01 2016-10-12 杭州佳力斯韦姆新能源科技有限公司 Cascade CO2 heat pump capable of achieving defrosting through reversing of four-way valve and defrosting method of cascade CO2 heat pump
CN106766353A (en) * 2016-12-26 2017-05-31 天津商业大学 The refrigeration system of Two-stage Compression and autocascade cycle can be realized
CN109442783A (en) * 2018-11-06 2019-03-08 中建五局第三建设有限公司 A kind of cold-heat combined Regional Energy Supply Method of ultrahigh energy efficiency and system
CN109579337A (en) * 2018-11-26 2019-04-05 江苏天舒电器有限公司 A kind of superposition type hot wind control system and method
CN110030754A (en) * 2019-03-20 2019-07-19 浙江大学宁波理工学院 A kind of refrigeration system improving multichannel evaporator inlet refrigerant distributing uniformity
KR102173814B1 (en) * 2020-08-25 2020-11-04 (주)대성마리프 Cascade heat pump system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106016802A (en) * 2016-07-01 2016-10-12 杭州佳力斯韦姆新能源科技有限公司 Cascade CO2 heat pump capable of achieving defrosting through reversing of four-way valve and defrosting method of cascade CO2 heat pump
CN106766353A (en) * 2016-12-26 2017-05-31 天津商业大学 The refrigeration system of Two-stage Compression and autocascade cycle can be realized
CN106766353B (en) * 2016-12-26 2019-11-22 天津商业大学 It is able to achieve the refrigeration system of Two-stage Compression and autocascade cycle
CN109442783A (en) * 2018-11-06 2019-03-08 中建五局第三建设有限公司 A kind of cold-heat combined Regional Energy Supply Method of ultrahigh energy efficiency and system
CN109579337A (en) * 2018-11-26 2019-04-05 江苏天舒电器有限公司 A kind of superposition type hot wind control system and method
CN110030754A (en) * 2019-03-20 2019-07-19 浙江大学宁波理工学院 A kind of refrigeration system improving multichannel evaporator inlet refrigerant distributing uniformity
KR102173814B1 (en) * 2020-08-25 2020-11-04 (주)대성마리프 Cascade heat pump system

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