CN111288679A - Single-stage and double-stage switching evaporation supercooling ejector refrigeration heat pump circulation system - Google Patents

Single-stage and double-stage switching evaporation supercooling ejector refrigeration heat pump circulation system Download PDF

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Publication number
CN111288679A
CN111288679A CN202010158615.2A CN202010158615A CN111288679A CN 111288679 A CN111288679 A CN 111288679A CN 202010158615 A CN202010158615 A CN 202010158615A CN 111288679 A CN111288679 A CN 111288679A
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China
Prior art keywords
pipeline
compressor
evaporation
ejector
stage
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Pending
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CN202010158615.2A
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Chinese (zh)
Inventor
段超龙
陈志寿
杨能生
刘国栋
方习锋
颜洁
邹佳乐
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CHINA LIGHT INDUSTRY WUHAN DESIGN ENGINEERING CO LTD
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CHINA LIGHT INDUSTRY WUHAN DESIGN ENGINEERING CO LTD
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Priority to CN202010158615.2A priority Critical patent/CN111288679A/en
Publication of CN111288679A publication Critical patent/CN111288679A/en
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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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Abstract

The invention relates to a refrigeration heat pump circulating system of a single-stage and double-stage switching evaporation supercooling ejector, which comprises a first compressor, a second compressor, a four-way valve, a condensation heat exchanger, a first throttling valve, an evaporation supercooling device, an ejector, a vapor-liquid separator, a second throttling valve and an evaporation heat exchanger, wherein the first throttling valve is connected with the first throttling valve; according to the invention, the four-way valve can be used for realizing the switching of the parallel single-stage compression and the serial two-stage compression of the first compressor and the second compressor according to the operation condition; the new evaporation supercooling mode can reduce the gasification amount and throttling loss of the throttled working medium, is beneficial to the ejector to recover compression expansion work, and improves the COP of the system while increasing the refrigerating and heating capacities of the system; the problems that when the supercooling technologies such as a heat regenerator, air supply and enthalpy increase are implemented, the obtained supercooling degree is limited, the supercooling degree is limited by the middle replenishing pressure, the compression type is limited and the like are solved.

Description

Single-stage and double-stage switching evaporation supercooling ejector refrigeration heat pump circulation system
Technical Field
The invention belongs to the technical field of energy consumption for building air conditioning and heating, and particularly relates to a single-stage and double-stage switching evaporation supercooling ejector refrigeration heat pump circulating system which is suitable for using CO2The working medium and other refrigerant working media are used as the refrigeration cycle and the heat pump cycle of the refrigerant under the transcritical cycle and subcritical cycle modes.
Background
For the vapor compression type circulation, the supercooling degree of the condenser is increased, so that the refrigerating capacity of unit refrigerant flowing through the evaporator can be increased, and the COP of the system can be improved. The existing supercooling mode mainly adopts two modes of a regenerator and an economizer. Although both the regenerator and the economizer can achieve subcooling, the two are clearly different. For the regenerator, the degree of subcooling of the refrigerant before the throttle is increased while the degree of superheat at the compressor suction is also increased, with subcooling being beneficial for the system COP but superheat being detrimental thereto. For a quasi-two-stage compression system using an economizer, only a vapor-supplementing enthalpy-increasing turbocompressor can be used, and meanwhile, the refrigeration capacity of part of refrigerant is sacrificed and is limited by the intermediate vapor-supplementing pressure. When the vapor-supplementing enthalpy-increasing technology is implemented, the supercooling degree is limited by the middle supplementing pressure. For a single stage compression system using an economizer, the cycle has limited capability to increase system COP when achieving large subcooling, since the economizer and evaporator pressures are the same.
1. Heat regenerator
The regenerator is also called a gas-liquid heat exchanger. A heat exchange apparatus for subcooling and superheating a refrigerant liquid in a refrigeration system utilizes refrigerant vapor from an evaporator to cool the high pressure liquid prior to entering the evaporator.
The method is characterized in that: the gas entering the compressor can be changed into superheated steam by using the heat regenerator, so that liquid drops carried in return gas are gasified, and the compressor is prevented from generating liquid impact; the liquid entering the evaporator is supercooled, and throttling loss is reduced. The degree of subcooling of the refrigerant before the throttle is increased while the degree of superheat at the compressor suction is also increased, with subcooling being beneficial for the system COP but superheat being detrimental thereto.
2. Quasi-two-stage compression system adopting economizer
The gas-supplementing enthalpy-increasing scroll compressor is a compressor with a gas-supplementing structure, changes a one-way gas suction mode into a one-way gas suction mode and a one-way gas supplementing mode, and is also called a quasi-two-stage compressor. The air supply channel is provided with an air supply hole in the middle of the vortex disc, and gas state, or liquid, or gas-liquid mixture is sprayed to the compression cavity, so that the exhaust temperature is reduced, and the performance of the air supply channel under extreme working conditions is improved.
The method is characterized in that: the vapor-filling enthalpy-increasing scroll compressor reduces the enthalpy value of the rest part of the refrigerant by sacrificing a part of the refrigerant, thereby improving the energy efficiency, and replenishing the sacrificed gas state in the compression process to achieve the effect of reducing the exhaust temperature. Therefore, the performance can be better under the extreme working condition. But at the same time, the refrigeration capacity of part of the refrigerant is sacrificed, and the quasi-two-stage compression of the form can only use a turbo compressor and is limited by the intermediate air supply pressure. When the vapor-supplying enthalpy-increasing technology is implemented, a part of problems need to be solved, such as control strategies, matching of vapor-supplying throttling elements, consideration of economy and the like.
3. Single stage compression system using economizer
A single-stage compression system is adopted, and a one-path throttling evaporation mode is changed into a mode that one-path refrigerant working medium is evaporated in an economizer and used for supercooling the other-path refrigerant working medium. The circulation mode can obtain larger supercooling degree, but the supercooling degree of the system COP is limited, and the circulation mode cannot adjust the optimal supercooling degree to enable the system COP to reach the maximum value and cannot adjust the supercooling degree to improve the heating/refrigerating capacity of the refrigerating system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a refrigeration heat pump circulating system of a single-stage and double-stage switching evaporation supercooling ejector,
in order to solve the technical problems, the invention adopts the following technical scheme:
a single two-stage switching evaporative subcooling ejector refrigeration heat pump cycle system comprising: the system comprises a first compressor, a second compressor, a four-way valve, a condensing heat exchanger, a first throttling valve, an evaporation subcooler, an ejector, a gas-liquid separator, a second throttling valve and an evaporation heat exchanger;
the exhaust port of the first compressor is connected with the inlet end of the condensing heat exchanger through a first pipeline; an exhaust port of the second compressor is connected with a first port of the four-way valve through a second pipeline; the third pipeline is respectively communicated with the first pipeline and a fourth port of the four-way valve; the outlet end of the condensation heat exchanger is connected with the high-temperature side inlet of the evaporation subcooler through a fourth pipeline, the high-temperature side outlet of the evaporation subcooler is connected with the working fluid inlet of the ejector through a sixth pipeline, the outlet end of the ejector is connected with the suction inlet of the vapor-liquid separator through an eighth pipeline, the liquid working medium outlet of the vapor-liquid separator is connected with one end of the evaporation heat exchanger through a ninth pipeline, a second throttling valve and a tenth pipeline in sequence, and the other end of the evaporation heat exchanger is connected with the injection fluid inlet of the ejector through an eleventh pipeline; a gaseous working medium outlet of the gas-liquid separator is connected with a suction inlet of the second compressor through a twelfth pipeline; the fifth pipeline is connected with the fourth pipeline and an evaporation side inlet of the evaporation subcooler, a first throttle valve is arranged on the fifth pipeline, and an evaporation side outlet of the evaporation subcooler is connected with a suction inlet of the first compressor through a seventh pipeline; the thirteenth pipeline is connected with the seventh pipeline and a third port of the four-way valve, and a one-way valve is arranged on the thirteenth pipeline; and the fourteenth pipeline is connected with the seventh pipeline and the second port of the four-way valve.
In the invention, the evaporation subcooler preferably adopts an economizer, and can also adopt the forms of a flash evaporator, a heat exchanger and the like, thereby realizing the subcooling of the working medium entering the throttling valve, and the evaporation pressure of the evaporation subcooler can be adjusted according to the size of the subcooling degree.
In the invention, CO can be used as the recycled working medium2Working medium can be adopted, other refrigerant working media can be adopted, and the cycle is suitable for both transcritical and subcritical working mediaAnd (5) a system circulation mode.
The single-stage and double-stage switching evaporation supercooling refrigeration heat pump circulating system can be divided into circulating systems under two working conditions according to different working processes of the circulating system: single-stage evaporation supercooling circulation system, doublestage evaporation supercooling circulation system to satisfy the demand under the different work condition:
compared with the prior art, the invention has the following beneficial effects:
1. the method avoids the phenomenon that the super-cooling degree of the refrigerant before the throttling valve is increased by using a heat regenerator, and simultaneously, the superheat degree of a suction inlet of a compressor is also increased, wherein the super-cooling is beneficial to the system COP, but the superheat is harmful to the system COP.
2. The problems that the air-supplementing enthalpy-increasing turbo compressor adopting an economizer sacrifices the refrigerating capacity of part of refrigerant, the quasi-two-stage compression only can use the turbo compressor and is limited by the middle air-supplementing pressure are solved; the problem that the COP improvement capacity of the system is limited when large supercooling degree is obtained by adopting a single-stage compression system of the economizer is solved.
3. The supercooling circulation mode provided by the invention is beneficial to improving the actual running performance of the system, and reduces the irreversible loss caused by the throttling process of the ejector and the throttle valve, thereby improving the system efficiency; the gasification amount of the working medium after throttling is reduced, and the dryness of the nozzle outlet and the ejector outlet of the ejector is also reduced.
4. The temperature drop in the evaporation subcooler in the circulation system of the invention has an optimal value (i.e. corresponds to an optimal supercooling degree). The contradiction between the heat supply of the heat pump and the heat demand of the building when the air source heat pump runs in winter can be solved by adjusting the temperature drop in the evaporation subcooler.
5. The circulating system can realize single-stage and double-stage switching to deal with outdoor temperature change, thereby ensuring the requirements of cooling capacity, heating capacity and heating temperature and solving the heat supply and demand contradiction of air source heat pump heating.
Drawings
Fig. 1 is a structural schematic diagram of a refrigeration heat pump circulating system of a single-stage and double-stage switching evaporation supercooling ejector of the invention.
Reference numerals: 1-a first compressor; 101-suction inlet of first compressor; 102-a discharge port of the first compressor; 2-a second compressor; 201-suction inlet of second compressor; 202-a discharge port of the second compressor; 3-a four-way valve; 4-a condensing heat exchanger; 5-a first throttle valve; 6-an evaporation subcooler; 7-an ejector; 8-a vapor-liquid separator; 801-suction inlet of vapor-liquid separator; 802-a gaseous working medium outlet of the vapor-liquid separator; 803-liquid working medium outlet 803; 9-a second throttle valve; 10-an evaporative heat exchanger; 11-a one-way valve;
l01 — first line; l02 — second line; l03 — third line; l04 — fourth line; l05-fifth line; l06-sixth line; l07-seventh line; l08 — eighth line; l09-ninth line; l10-tenth line; l11 — eleventh line; l12-twelfth line; l13-thirteenth line; l14-fourteenth line;
a-a first port of a four-way valve; b-a second port of the four-way valve; c-a third port of the four-way valve; d-a fourth port of the four-way valve; e-a working fluid inlet of the ejector; f-the ejector fluid inlet of the ejector; g-outlet end of ejector.
Detailed Description
The present invention will be described in further detail with reference to examples for the purpose of facilitating understanding and practice of the invention by those of ordinary skill in the art, and it is to be understood that the present invention has been described in the illustrative embodiments and is not to be construed as limited thereto.
A single two-stage switching evaporative subcooling ejector refrigeration heat pump cycle system comprising: the system comprises a first compressor 1, a second compressor 2, a four-way valve 3, a condensing heat exchanger 4, a first throttle valve 5, an evaporation subcooler 6, an ejector 7, a vapor-liquid separator 8, a second throttle valve 9 and an evaporation heat exchanger 10;
the discharge outlet 102 of the first compressor 1 is connected to the inlet end of the condensing heat exchanger 4 through a first line L01; the discharge port 202 of the second compressor 2 is connected to the first port a of the four-way valve 3 through a second line L02; the third line L03 is respectively communicated with the first line L01 and a fourth port d of the four-way valve 3; the outlet end of the condensing heat exchanger 4 is connected with the high-temperature side inlet of the evaporating subcooler 6 through a fourth pipeline L04, the high-temperature side outlet of the evaporating subcooler 6 is connected with the working fluid inlet e of the ejector 7 through a sixth pipeline L06, the outlet end g of the ejector 7 is connected with the suction inlet 801 of the vapor-liquid separator 8 through an eighth pipeline L08, the liquid working medium outlet 803 of the vapor-liquid separator 8 is connected with one end of the evaporating heat exchanger 10 through a ninth pipeline L09, a second throttle valve 9 and a tenth pipeline L10 in sequence, and the other end of the evaporating heat exchanger 10 is connected with the injection fluid inlet f of the ejector 7 through an eleventh pipeline L11; the gaseous working medium outlet 802 of the gas-liquid separator 8 is connected with the suction inlet 201 of the second compressor 2 through a twelfth pipeline L12; the fifth pipeline L05 connects the fourth pipeline L04 and the evaporation side inlet of the evaporation subcooler 6, the fifth pipeline L05 is provided with the first throttle valve 5, and the evaporation side outlet of the evaporation subcooler 6 is connected with the suction port 101 of the first compressor 1 through the seventh pipeline L07; a thirteenth line L13 connects the seventh line L07 with the third port c of the four-way valve 3, the thirteenth line L13 is provided with a check valve 11, and the check valve 11 makes the third port c of the four-way valve 3 go in and out only; the fourteenth line L14 connects the seventh line L07 and the second port b of the four-way valve 3.
In the present invention, the system further comprises a first throttle valve 5, a second throttle valve 9 and a check valve 11; the first throttle valve 5 is provided on the fifth line L05, the second throttle valve 9 is provided on the ninth line L09, and the check valve 11 is provided on the thirteenth line L13.
In the invention, the evaporation subcooler preferably adopts an economizer, and can also adopt the forms of a flash evaporator, a heat exchanger and the like, thereby realizing the subcooling of the working medium entering the throttling valve, and the evaporation pressure of the evaporation subcooler can be adjusted according to the size of the subcooling degree.
In the invention, CO can be used as the recycled working medium2The working medium can also adopt other refrigerant working media, and the cycle is simultaneously suitable for two system cycle modes of transcritical and subcritical.
When the first compressor 1 and the second compressor 2 are in parallel single-stage compression operation:
as shown in fig. 1, when the first compressor 1 and the second compressor 2 are in parallel single-stage compression operation, the first port a and the fourth port d of the four-way valve 3 are communicated, the second port b and the third port c are communicated, the high-temperature high-pressure gas discharged by the second compressor 2 enters the first port a of the four-way valve 3 through the second pipeline L02, and after being discharged through the fourth port d of the four-way valve 3, the high-temperature high-pressure gas enters the first pipeline L01 through the third pipeline L03, and then joins with the high-temperature high-pressure gas discharged by the first compressor 1 in the first pipeline L01, and is divided into two paths after entering the condensing heat exchanger 4 for heat exchange: one path of working medium enters the evaporation subcooler 6 (or flash evaporator) for evaporation and heat absorption after being throttled by the first throttle valve 5, then returns to the suction port 101 of the first compressor 1 through the seventh pipeline L07, is discharged through the exhaust port 102 of the first compressor 1 after being compressed by the first compressor 1, and the other path of working medium is subcooled by the evaporation subcooler 6; the other path of the super-cooled working medium enters an injection fluid inlet e of the ejector 7, the low-pressure gaseous working medium in the evaporation heat exchanger 10 is mixed and lifted to be medium-pressure working medium under the action of the ejector 7, and wet steam leaving an outlet end g of the ejector 7 and entering the steam-liquid separator 8 is separated into liquid working medium and gaseous working medium; the liquid working medium in the gas-liquid separator 8 is throttled by the second throttle valve 9 and then enters the evaporation heat exchanger 10 to be evaporated and absorb heat, and then the low-pressure gaseous working medium is sucked by the ejector 7 to inject the fluid inlet f again; the gaseous working medium in the vapor-liquid separator 8 returns to the suction port 201 of the second compressor 2, is compressed by the second compressor 2, enters the first port a of the four-way valve through the second pipeline L02, is discharged through the fourth port d of the four-way valve, is sent into the first pipeline L01 through the third pipeline L03, and then is converged with the high-temperature and high-pressure gas discharged from the first compressor 1 and the second compressor 2 in the first pipeline L01.
The first compressor 1 and the second compressor 2 are connected in series and operated in a two-stage compression mode:
as shown in fig. 1, when the first compressor 1 and the second compressor 2 are connected in series and operate in a two-stage compression mode, the first port a and the second port b of the four-way valve 3 are communicated, the third port c and the fourth port d are communicated, and a high-temperature high-pressure gas discharged by the first compressor 1 is divided into two paths after heat exchange by the condensing heat exchanger 4: one path of working medium enters an evaporation subcooler 6 (or a flash evaporator) after being throttled by a first throttle valve 5 to evaporate and absorb heat, and the other path of working medium is subcooled; the other path of the super-cooled working medium enters a working fluid inlet e of the ejector 7, the low-pressure gaseous working medium in the evaporation heat exchanger 10 is mixed and lifted to be medium-pressure working medium under the action of the ejector 7, and wet steam leaving an outlet end g of the ejector 7 and entering the steam-liquid separator 8 is separated into liquid working medium and gaseous working medium; the liquid working medium in the gas-liquid separator 8 is throttled by the second throttle valve 9 and then enters the evaporation heat exchanger 10 to be evaporated and absorb heat, and then the low-pressure gaseous working medium is sucked by the ejector 7 to inject the fluid inlet f again; the gaseous working medium in the vapor-liquid separator returns to the suction inlet of the second compressor 2, is compressed by the second compressor 2, enters the first port a of the four-way valve through the second pipeline L02, is discharged through the second port b of the four-way valve, is sent into the seventh pipeline L07 through the fourteenth pipeline L14, is then converged with the medium-pressure working medium coming out of the evaporation subcooler 6 in the seventh pipeline L07, then returns to the suction inlet of the first compressor 1, and finally enters the first compressor 1.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (1)

1. A single-stage and double-stage switching evaporation supercooling ejector refrigeration heat pump circulating system comprises a first compressor (1), and is characterized by further comprising a second compressor (2), a four-way valve (3), a condensation heat exchanger (4), a first throttling valve (5), an evaporation supercooling device (6), an ejector (7), a vapor-liquid separator (8), a second throttling valve (9) and an evaporation heat exchanger (10);
the exhaust (102) of the first compressor (1) is connected to the inlet end of the condensing heat exchanger (4) via a first line (L01); an exhaust port (202) of the second compressor (2) is connected with a first port (a) of the four-way valve (3) through a second pipeline (L02); the third pipeline (L03) is respectively communicated with the first pipeline (L01) and the fourth port (d) of the four-way valve (3); the outlet end of the condensing heat exchanger (4) is connected with the high-temperature side inlet of the evaporating subcooler (6) through a fourth pipeline (L04), the high-temperature side outlet of the evaporating subcooler (6) is connected with the working fluid inlet (e) of the ejector (7) through a sixth pipeline (L06), the outlet end (g) of the ejector (7) is connected with the suction inlet (801) of the vapor-liquid separator (8) through an eighth pipeline (L08), the liquid working medium outlet (803) of the vapor-liquid separator (8) is connected with one end of the evaporating heat exchanger (10) through a ninth pipeline (L09), a second throttle valve (9) and a tenth pipeline (L10) in sequence, and the other end of the evaporating heat exchanger (10) is connected with the injection fluid inlet (f) of the ejector (7) through an eleventh pipeline (L11); a gaseous working medium outlet (802) of the gas-liquid separator (8) is connected with a suction inlet (201) of the second compressor (2) through a twelfth pipeline (L12); a fifth pipeline (L05) is connected with the fourth pipeline (L04) and an evaporation side inlet of the evaporation subcooler (6), a first throttle valve (5) is arranged on the fifth pipeline (L05), and an evaporation side outlet of the evaporation subcooler (6) is connected with a suction inlet (101) of the first compressor (1) through a seventh pipeline (L07); the thirteenth pipeline (L13) is connected with the seventh pipeline (L07) and the third port (c) of the four-way valve (3), and the thirteenth pipeline (L13) is provided with a one-way valve (11); the fourteenth line (L14) connects the seventh line (L07) and the second port (b) of the four-way valve (3).
CN202010158615.2A 2020-03-09 2020-03-09 Single-stage and double-stage switching evaporation supercooling ejector refrigeration heat pump circulation system Pending CN111288679A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111854225A (en) * 2020-07-29 2020-10-30 中国石油大学(华东) Multi-pressure-stage air supplementing type high-temperature heat pump steam system
CN113154557A (en) * 2021-03-19 2021-07-23 浙江理工大学 Quasi-two-stage compression four-pipe air conditioning system
CN113932482A (en) * 2021-11-05 2022-01-14 广州兰石技术开发有限公司 Energy-saving enthalpy difference laboratory heat exchange system capable of switching modes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111854225A (en) * 2020-07-29 2020-10-30 中国石油大学(华东) Multi-pressure-stage air supplementing type high-temperature heat pump steam system
CN113154557A (en) * 2021-03-19 2021-07-23 浙江理工大学 Quasi-two-stage compression four-pipe air conditioning system
CN113154557B (en) * 2021-03-19 2022-12-20 浙江理工大学 Quasi-two-stage compression four-pipe air conditioning system
CN113932482A (en) * 2021-11-05 2022-01-14 广州兰石技术开发有限公司 Energy-saving enthalpy difference laboratory heat exchange system capable of switching modes

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