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CN115096012A - Refrigerating system with gas-liquid relay - Google Patents

Refrigerating system with gas-liquid relay Download PDF

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Publication number
CN115096012A
CN115096012A CN202210746454.8A CN202210746454A CN115096012A CN 115096012 A CN115096012 A CN 115096012A CN 202210746454 A CN202210746454 A CN 202210746454A CN 115096012 A CN115096012 A CN 115096012A
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CN
China
Prior art keywords
gas
refrigerant
refrigeration
liquid relay
liquid
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Pending
Application number
CN202210746454.8A
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Chinese (zh)
Inventor
朱少李
郭祥
邵长鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pengniao Technology Shandong Co ltd
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Pengniao Technology Shandong Co ltd
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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Publication date
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Priority to CN202210746454.8A priority Critical patent/CN115096012A/en
Publication of CN115096012A publication Critical patent/CN115096012A/en
Pending legal-status Critical Current

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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
    • F25B5/00Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • 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
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • F25B41/34Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20709Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
    • H05K7/208Liquid cooling with phase change
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00Constructional details common to different types of electric apparatus
    • H05K7/20Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20709Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
    • H05K7/20836Thermal management, e.g. server temperature control

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

The invention discloses a refrigeration system with a gas-liquid relay, which relates to the technical field of refrigeration and comprises a compressor, a first evaporative condenser, an electronic expansion valve and the gas-liquid relay which are sequentially connected, wherein a first refrigerant outlet of the gas-liquid relay is communicated with a refrigerant inlet of a tail end evaporator and introduces a refrigerant into the tail end evaporator through a delivery pump; and a refrigerant outlet of the tail end evaporator is communicated with a first refrigerant inlet of the gas-liquid relay, and a second refrigerant outlet of the gas-liquid relay is communicated with the compressor. The invention adopts the gas-liquid relay as the intermediate container, the gas-liquid relay cancels a heat exchanger which utilizes the heat exchange between the refrigerant and the water, and provides transitional buffer for the gas-liquid mixture, thereby ensuring that the stable liquid refrigerant flows into the evaporator, and effectively preventing the liquid impact phenomenon. In addition, the condensation end adopts an evaporative condenser, heat is taken away through water circulation evaporation to condense the refrigerant, the heat exchange efficiency is high, the condensation temperature is effectively reduced, and the refrigeration efficiency is improved.

Description

Refrigerating system with gas-liquid relay
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigeration system with a gas-liquid relay.
Background
In the machine rooms of the industries such as data centers and the like, because a large number of electronic devices run simultaneously and the heat dissipation capacity is large, in order to ensure the normal running of the equipment, the equipment needs to be refrigerated not only in summer, but also in winter, particularly in northern areas of China, the outdoor air dry bulb temperature in winter and in spring and autumn is lower, the environment wet bulb temperature is also lower, and under the condition, the purpose of energy conservation cannot be realized because the compressor is still only started for refrigeration, and the waste of electric energy is caused.
In addition, the traditional refrigeration mode adopts chilled water and a refrigerant to exchange heat and is used as a refrigeration medium to carry out cooling, the heat capacity of water is small, so the required water flow is large, the power of conveying equipment is high, and meanwhile, the temperature rise is realized in the heat exchange process, so that the evaporation temperature of a corresponding refrigeration system is low, the power of a compressor is high, and the energy-saving effect is poor.
Disclosure of Invention
In view of the technical problems mentioned in the background art, the present invention provides a refrigeration system with a gas-liquid relay.
The invention adopts the following technical scheme: a refrigeration system with a gas-liquid relay comprises a compressor, a first evaporative condenser, an electronic expansion valve and the gas-liquid relay which are sequentially connected, wherein a first refrigerant outlet of the gas-liquid relay is communicated with a refrigerant inlet of a tail end evaporator and introduces a refrigerant into the tail end evaporator through a delivery pump so as to perform heat exchange; and a refrigerant outlet of the tail end evaporator is communicated with a first refrigerant inlet of the gas-liquid relay, and a second refrigerant outlet of the gas-liquid relay is communicated with the compressor, so that a first refrigerating loop for refrigerant circulation is formed.
Furthermore, a refrigerant outlet of the terminal evaporator is connected with a first refrigeration branch, a first electronic valve is connected to the first refrigeration branch, the first refrigeration branch is connected with the compressor in parallel, and can only be simultaneously conducted with one branch where the compressor is located, and when the first refrigeration branch is conducted, the compressor is closed to form a second refrigeration loop in which the refrigerant circulates.
Furthermore, the electronic expansion valve is connected with a second electronic valve in parallel, and when the first refrigeration loop is in a conducting state, the electronic expansion valve is opened; when the second refrigeration loop is in a conducting state, the second electronic valve is opened.
Furthermore, a third electric valve is connected on a connecting pipeline between a refrigerant outlet of the tail end evaporator and a first refrigerant inlet of the gas-liquid relay, the third electric valve is connected with a second refrigeration branch in parallel, a second evaporative condenser and a fourth electric valve are connected on the second refrigeration branch, and when the second refrigeration branch is in a conduction state, the second evaporative condenser, the gas-liquid relay and the tail end evaporator which are sequentially connected are communicated to form a third refrigeration loop.
Furthermore, the refrigerant used by the refrigeration system is a refrigerant adopting a phase-change material.
Further, the number of the end evaporators is multiple and the end evaporators are mutually connected in parallel.
Further, the evaporative condenser is a plate evaporative condenser.
Further, the compressor adopts an oil-free centrifugal compressor.
Compared with the prior art, the invention has the advantages that: in the working process of the refrigeration system with the gas-liquid relay, low-temperature and low-pressure refrigerant gas is compressed by a compressor and then is changed into high-temperature and high-pressure gas, the high-temperature and high-pressure liquid is formed by condensation of an evaporative condenser and is introduced into an electronic expansion valve, the temperature and the pressure are rapidly reduced, the volume is rapidly expanded, a low-temperature and low-pressure gas-liquid mixture is formed and then is introduced into the gas-liquid relay, the refrigerant is directly introduced into a tail end evaporator through a delivery pump for heat exchange, and the heat exchange efficiency is improved. The low-temperature low-pressure liquid refrigerant absorbs ambient heat in the evaporator to become low-temperature low-pressure gas, returns to the gas-liquid relay and starts the next refrigeration cycle. The intermediate container adopts the gas-liquid relay, the gas-liquid relay cancels a heat exchanger which utilizes the heat exchange between the refrigerant and water, the gas-liquid relay provides transitional buffer for a gas-liquid mixture, and the stable liquid refrigerant flowing into the evaporator is ensured, so that the liquid impact phenomenon is effectively prevented. In addition, the condensation end adopts an evaporative condenser, heat is taken away through water circulation evaporation to condense the refrigerant, the heat exchange efficiency is high, the condensation temperature is effectively reduced, and the refrigeration efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a first embodiment of the refrigeration system with a vapor-liquid relay according to the present invention;
FIG. 2 is a schematic diagram of the overall structure of a second embodiment of the refrigeration system with a vapor-liquid relay according to the present invention;
wherein: 1-compressor, 2-first evaporative condenser, 3-electronic expansion valve, 4-gas-liquid relay, 5-tail end evaporator, 6-delivery pump, 7-first refrigeration branch, 8-first electronic valve, 9-second electronic valve, 10-third electric valve, 11-second refrigeration branch, 12-second evaporative condenser, 13-fourth electric valve,
41-a first refrigerant outlet, 42-a first refrigerant inlet, 43-a second refrigerant outlet.
Detailed Description
Hereinafter, in order to facilitate the technical solution of the present invention for those skilled in the art to understand, further description will be made with reference to the accompanying drawings. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1, the refrigeration system with a gas-liquid relay provided in this embodiment is used for machine room cooling operation in industries such as data centers, and includes a compressor 1, a first evaporative condenser 2, an electronic expansion valve 3, and a gas-liquid relay 4 connected in sequence, where the gas-liquid relay 4 is used as an intermediate container, a first refrigerant outlet 41 of the gas-liquid relay is communicated with a refrigerant inlet of a terminal evaporator 5, and liquid refrigerant is introduced into the terminal evaporator 5 through a delivery pump 6 to perform heat exchange, thereby completing the refrigeration operation. The refrigerant outlet of the end evaporator 5 communicates with the first refrigerant inlet 42 of the gas-liquid relay 4, and the second refrigerant outlet 43 of the gas-liquid relay 4 communicates with the compressor 1. Therefore, in the present embodiment, the compressor 1, the first evaporative condenser 2, the electronic expansion valve 3, the gas-liquid relay device 4, and the end evaporator 5, which are connected in this order, form a first refrigeration circuit in which a refrigerant flows.
In the embodiment, the gas-liquid relay 4 is used as an intermediate container, a heat exchanger for exchanging heat between refrigerant and water is omitted, transitional buffering is provided for a gas-liquid mixture, stable liquid refrigerant flowing into the tail end evaporator 5 is ensured, and the liquid impact phenomenon is effectively prevented.
The tail end of the embodiment is different from a mode that a traditional water system utilizes sensible heat exchange, and utilizes refrigerant phase change heat exchange through direct evaporation of a refrigerant, so that the heat exchange effect is greatly improved, the evaporation and condensation temperature difference is greatly reduced, the compression ratio is reduced, the energy efficiency coefficient of the compressor 1 is greatly improved, the energy consumption of the delivery pump 6 is also reduced, and the effect of greatly saving energy is realized. In addition, when the embodiment is implemented specifically, the refrigerant is a refrigerant made of a phase-change material, such as freon, and the phase change of the refrigerant is utilized to directly exchange heat, so that the refrigeration efficiency is improved, and the heat exchange temperature difference loss in the refrigeration transmission process is avoided.
When the plate type evaporative condenser is specifically implemented, the first evaporative condenser 2 is a plate type evaporative condenser adopting a plate type heat exchange core body, heat is taken away through water circulation evaporation to condense a refrigerant, and compared with a conventional water cooling refrigeration mode and an air cooling refrigeration mode, the condensation temperature is reduced in different amplitudes, on one hand, the system pressure drop can be reduced, on the other hand, the heat exchange efficiency of the system can be improved, the condensation temperature is effectively reduced, and the refrigeration effect is improved.
In specific implementation, the end evaporator 5 may be parallel evaporators, and a plurality of evaporators correspond to one delivery pump 6. Of course, each or a part of the pumps may be provided to correspond to one of the transfer pumps 6, so that the overall heat exchange efficiency can be improved when the pumps are operated in a machine room with a large range.
It is worth mentioning that, this embodiment is different from the scroll compressor or the screw compressor that traditional refrigerating system adopted, and traditional scroll compressor or screw compressor use lubricating oil to drive, on the one hand, when lubricating oil and refrigerant mix, can influence the heat exchange efficiency of refrigerant, and on the other hand, the rotational speed of this type of compressor also can not be too high, therefore compression efficiency is lower. In specific implementation of the present embodiment, the compressor 1 is an oil-free centrifugal compressor, for example, a magnetic suspension centrifugal compressor can be used, such compressor can operate at a high rotation speed, and has high compression efficiency, and meanwhile, the compressor adopts an oil-free design and has no oil film thermal resistance, thereby further improving heat exchange efficiency.
In the working process of the refrigeration system with the gas-liquid relay in the embodiment, the low-temperature low-pressure refrigerant gas is compressed by the compressor 1 and then becomes high-temperature high-pressure gas, the high-temperature high-pressure gas is condensed by the first evaporative condenser 2 to form medium-temperature high-pressure liquid, the medium-temperature high-pressure liquid is introduced into the electronic expansion valve 3, the temperature and the pressure are rapidly reduced, the volume is rapidly expanded, a low-temperature low-pressure gas-liquid mixture is formed and then is introduced into the gas-liquid relay 4, and the low-temperature low-pressure gas-liquid mixture is introduced into the tail-end evaporator 5 through the delivery pump 6. The low-temperature low-pressure liquid refrigerant absorbs ambient heat in the end evaporator 5 to become low-temperature low-pressure gas, returns to the gas-liquid relay unit 4, and starts the next refrigeration cycle.
As an optimized design scheme of the first embodiment, please continue to refer to fig. 1, a first refrigeration branch 7 is connected to a refrigerant outlet of the end evaporator 5, a first electric valve 8 is connected to the first refrigeration branch 7, the first refrigeration branch 7 is connected in parallel with the compressor 1, and only one of the branches where the compressor 1 is located can be simultaneously conducted, and when the first refrigeration branch 7 is conducted, the compressor 1 is turned off to form a second refrigeration loop for refrigerant circulation. In this embodiment, the first refrigeration branch 7 is provided by the compressor 1, and then in a season with a cool climate, the first refrigeration branch 7 can be selectively turned on and the compressor 1 can be turned off to perform a natural cooling mode. As shown in fig. 1, in the natural cooling mode, the first electric valve 8 is opened, the compressor 1 is closed, the refrigerant flows out of the end evaporator 5, passes through the first electric valve 8, sequentially passes through the first evaporative condenser 2 for condensation, and is introduced into the electronic expansion valve 3, the temperature and the pressure are rapidly reduced, the volume is rapidly expanded, a low-temperature and low-pressure gas-liquid mixture is formed, then the gas-liquid mixture is input into the gas-liquid relay 4, and returns to the end evaporator 5 through the delivery pump 6, and the circulation in the natural cooling mode is realized, so that the effect of saving energy greatly is achieved.
It should be noted that, in the optimization scheme of this embodiment, the control of the first electric valve 8 may be implemented by both the ambient wet bulb temperature and the gas-liquid relay pressure, and in specific implementation, when the ambient wet bulb temperature is lower than the set threshold T1, the first electric valve 8 is automatically turned on, and the compressor 1 is automatically stopped, and when the pressure in the gas-liquid relay 4 is higher than the set threshold P1, the first electric valve 8 is automatically turned off, and the compressor 1 is automatically started.
In this embodiment, the electronic expansion valve 3 may also be connected in parallel with a second electric valve 8, and when the first refrigeration loop is in a conduction state, the electronic expansion valve 3 is opened, and at this time, the second electric valve 8 is in a closing state, and the refrigeration system starts a compressor refrigeration mode; when the second refrigeration loop is in a conduction state, the second electric valve 8 is opened, the electronic expansion valve 3 is in a closing state at the moment, the system can only be in a natural cooling state at the moment, the compressor 1 and the electronic expansion valve 3 stop running at the same time, a natural cold source is used to the maximum extent, and energy consumption is reduced.
Through the design of the optimized scheme, the first embodiment operates the compressor refrigeration mode in summer and operates the natural cooling mode in the cool seasons of spring and autumn, the operation mode can combine meteorological parameters and characteristic parameters of the unit, the unit operates under the control of the control system, and the purpose of energy conservation is achieved on the basis of meeting the temperature control. The embodiment of the optimization scheme improves the efficiency of the machine room refrigeration cycle in the industries such as data centers and the like, and can fully utilize the outdoor low temperature to directly cool the refrigerant circulating in the system, thereby reducing the power of the compressor 1.
Example two:
the same parts of this embodiment as those of the embodiment are not described herein. Please refer to fig. 2 for an overall structural schematic diagram of a second embodiment of the refrigeration system with a gas-liquid relay according to the present invention, which is different from the first embodiment in that a third electric valve 10 is connected to a connection pipeline between a refrigerant outlet of the end evaporator 5 and a first refrigerant inlet 42 of the gas-liquid relay 4, the third electric valve 10 is connected in parallel with a second refrigeration branch 11, the second refrigeration branch 11 is connected with a second evaporative condenser 12 and a fourth electric valve 13, and in this embodiment, the second evaporative condenser 12 also adopts a plate evaporative condenser with a plate heat exchange core.
When the second refrigeration branch 11 is in a conducting state, the second evaporative condenser 12, the gas-liquid relay 4 and the end evaporator 5 which are connected in sequence are communicated to form a third refrigeration loop, that is, in this embodiment, a second evaporative condenser 12 is additionally arranged, so that a mixed refrigeration mode is realized, the refrigeration cycle of the compressor and the natural cooling cycle can work simultaneously, and the refrigeration effect is further improved.
In the second embodiment, in the refrigeration mode of the compressor, the third electric valve 10 is opened, the fourth electric valve 13 is closed, at this time, the second refrigeration branch 11 is in a disconnected state, the flow direction of the refrigerant is as described in the first embodiment, the refrigerant gas with low temperature and low pressure is compressed by the compressor 1 and then becomes high-temperature and high-pressure gas, the high-temperature and high-pressure liquid is condensed by the first evaporative condenser 2 and then is introduced into the electronic expansion valve 3, a gas-liquid mixture with low temperature and low pressure is formed and then is input into the gas-liquid relay 4, and the gas-liquid mixture is introduced into the end evaporator 5 through the delivery pump 6. The low-temperature low-pressure liquid refrigerant absorbs ambient heat in the tail end evaporator 5 to become low-temperature low-pressure gas, returns to the gas-liquid relay 4, and starts the next refrigeration cycle, and at this time, the system can be understood to be in an operation state in a pure compressor refrigeration mode.
In the second embodiment, in the natural cooling mode, the third electric valve 10 is closed, the fourth electric valve 13 is opened, and at this time, the second refrigeration branch 11 is in an open state, and the compressor 1 is automatically closed. The refrigerant flows out of the end evaporator 1, is condensed by the second evaporative condenser 12, is directly input into the gas-liquid relay 4, and returns to the end evaporator 5 through the delivery pump 6, so that the circulation in the natural cooling mode is realized, and at this time, the system can be understood as being in the running state in the pure natural cooling mode.
The second embodiment of the present invention is innovative in that, in the pure natural cooling mode, the system can combine the meteorological parameters and the characteristic parameter of the unit itself to determine to realize the synchronous start of the compressor cooling mode, and at this time, the system is in the mixed cooling mode operation, that is, the system can synchronously realize the synchronous cooling of the compressor cooling mode while operating the natural cooling mode by using the natural cold source, so as to further improve the cooling effect of the cooling system.
In specific implementation, the control of the electric valves 1 and 2 is realized by the ambient wet bulb temperature and the pressure of the gas-liquid relay 4.
For example, when the ambient wet bulb temperature is higher than the set threshold T1, the third electric valve 10 is opened, the fourth electric valve 13 is closed, the second evaporative condenser 12 stops working, the compressor 1 is started, and the system operates in the compressor cooling mode.
When the environmental wet bulb temperature is lower than a set threshold value T1, the third electric valve 10 is closed, the fourth electric valve 13 is opened, the second evaporative condenser 2 is opened, the compressor 1 is not stopped at the moment, and the system runs a mixed refrigeration mode;
when the ambient wet bulb temperature is lower than a set value T2(T2< T1), the temperature is further reduced, in the mixed refrigeration mode, the compressor 1 stops operating, the first evaporative condenser 2 also stops synchronously, and the system only operates in a natural cooling mode at the moment; in addition, when the pressure of the gas-liquid relay is higher than the set value P1, the compressor 1 is started again, the first evaporative condenser is started, and the system can return to the mixed cooling mode again.
As can be seen from the above description, the refrigeration system of the present embodiment can implement multiple refrigeration operation modes according to seasonal variations, such as a compressor refrigeration mode in summer, a mixed refrigeration mode in spring and autumn, and a natural cooling mode in winter, and the operation modes can be automatically controlled and operated in combination with meteorological parameters and characteristic parameters of the unit itself, so as to achieve the purpose of energy saving while satisfying the temperature control.
The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should be made within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims (8)

1. A refrigerating system with a gas-liquid relay is characterized by comprising a compressor, a first evaporative condenser, an electronic expansion valve and the gas-liquid relay which are sequentially connected, wherein a first refrigerant outlet of the gas-liquid relay is communicated with a refrigerant inlet of a tail end evaporator and introduces a refrigerant into the tail end evaporator through a delivery pump so as to exchange heat; and a refrigerant outlet of the tail end evaporator is communicated with a first refrigerant inlet of the gas-liquid relay, and a second refrigerant outlet of the gas-liquid relay is communicated with the compressor, so that a first refrigerating loop through which refrigerants circulate is formed.
2. The refrigeration system with a gas-liquid relay according to claim 1, wherein a refrigerant outlet of the terminal evaporator is connected to a first refrigeration branch, the first refrigeration branch is connected to a first electric valve, the first refrigeration branch is connected in parallel with the compressor, and can be connected to only one of the branches where the compressor is located, and when the first refrigeration branch is connected, the compressor is closed to form a second refrigeration loop in which the refrigerant circulates.
3. The refrigerant system with vapor-liquid relay as set forth in claim 2, wherein said electronic expansion valve is connected in parallel with a second electrically operated valve, and said electronic expansion valve is opened when said first refrigerant circuit is in a conducting state; when the second refrigeration circuit is in a conduction state, the second electric valve is opened.
4. The refrigeration system with a gas-liquid relay according to claim 1, wherein a third electric valve is connected to a connection pipe between the refrigerant outlet of the terminal evaporator and the first refrigerant inlet of the gas-liquid relay, the third electric valve is connected in parallel with a second refrigeration branch, a second evaporative condenser and a fourth electric valve are connected to the second refrigeration branch, and when the second refrigeration branch is in a conduction state, the second evaporative condenser, the gas-liquid relay and the terminal evaporator which are sequentially connected are communicated to form a third refrigeration loop.
5. The refrigeration system with gas-liquid relay according to any one of claims 1 to 4, wherein the refrigerant used in the refrigeration system is a refrigerant using a phase-change material.
6. The vapor-liquid repeater according to any one of claims 1 to 4, wherein the number of the end evaporators is plural and they are connected in parallel with each other.
7. The refrigeration system with vapor-liquid relay according to any one of claims 1 to 4, wherein said evaporative condenser is a plate evaporative condenser.
8. The phase-change refrigeration system with vapor-liquid relay according to any one of claims 1 to 4, characterized in that the compressor is an oil-free centrifugal compressor.
CN202210746454.8A 2022-06-28 2022-06-28 Refrigerating system with gas-liquid relay Pending CN115096012A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5899091A (en) * 1997-12-15 1999-05-04 Carrier Corporation Refrigeration system with integrated economizer/oil cooler
US20140007613A1 (en) * 2011-03-16 2014-01-09 Nippon Soken, Inc. Cooling system
WO2019214297A1 (en) * 2018-05-09 2019-11-14 青岛海尔空调电子有限公司 Server room air conditioning system
CN108800646A (en) * 2018-06-17 2018-11-13 浙江国祥股份有限公司 A kind of evaporation cold air source heat pump unit
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CN111565543A (en) * 2020-05-11 2020-08-21 葛洲坝节能科技有限公司 Water-cooling natural cooling refrigerant direct cooling refrigeration system
CN113993360A (en) * 2021-11-29 2022-01-28 苏州浪潮智能科技有限公司 A data center energy-saving cooling system and method

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Application publication date: 20220923