US20140223957A1 - Compressor-free refrigeration system powered by heat source - Google Patents

Compressor-free refrigeration system powered by heat source Download PDF

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Publication number
US20140223957A1
US20140223957A1 US14/123,597 US201114123597A US2014223957A1 US 20140223957 A1 US20140223957 A1 US 20140223957A1 US 201114123597 A US201114123597 A US 201114123597A US 2014223957 A1 US2014223957 A1 US 2014223957A1
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United States
Prior art keywords
power generator
liquid
evaporator
refrigerating medium
working medium
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Abandoned
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US14/123,597
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English (en)
Inventor
Zhiming Wang
Chengwei Wang
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Individual
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Individual
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Publication of US20140223957A1 publication Critical patent/US20140223957A1/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
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • 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
    • F25B1/00—Compression machines, plants or systems with non-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
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • 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
    • F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
    • F25B23/006—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect boiling cooling systems
    • 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
    • F25B2300/00—Special arrangements or features for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/21—Reduction of parts

Definitions

  • the present patent application relates to a refrigeration system, in particular to a compressor-free refrigeration system powered by a heat source.
  • a conventional compression refrigerator consists of four parts: a compressor, a condenser, an evaporator, and an expansion valve.
  • the working process is as follows: a low-pressure gaseous heat exchange medium (e.g., Freon) vaporized in the evaporator is extracted by the compressor, compressed into high-pressure gas, and fed into the condenser; the high-pressure gas is refrigerated and condensed into high-pressure liquid in the condenser, throttled by the expansion valve into low-pressure liquid working medium, and fed back into the evaporator; the low-pressure liquid working medium at normal temperature in the evaporator absorbs heat from a refrigeration output; in that way, a refrigeration cycle is completed.
  • a low-pressure gaseous heat exchange medium e.g., Freon
  • the compression refrigeration technique has some drawbacks, such as high cost, installation inconvenience, high power consumption, and high noise.
  • the solar air-conditioner comprises an energy accumulator 2 , with a light-tube solar receiver 8 designed to convert light energy into heat energy arranged on one side of the energy accumulator 2 , and a tubular heat exchanger 3 containing a low-boiling working medium arranged in the cavity of the energy accumulator 2 .
  • the working medium is heated up and vaporized in the heat exchanger 3 , forming high-temperature and high-pressure gas; the gas is outputted from the heat exchanger 3 to an outdoor condenser 10 ; the temperature and pressure of the gas are decreased in the condenser 10 ; then, the gas is throttled by a throttle valve 12 .
  • the working medium is in low-temperature liquid state, and it flows into an indoor evaporator 11 and absorbs heat there, and thereby the indoor temperature is decreased.
  • the working medium flows through a booster 7 , a pressure valve 6 , and a solenoid-operated four-way valve into the heat exchanger 3 in the energy accumulator; in that way, a cycle is completed.
  • a booster 7 is used to drive the working medium in the evaporator to return to the heat exchanger, so as to accomplish working medium circulation.
  • Such a structure is still similar to a compressor, and doesn't thoroughly solve the problem of power required for driving the working medium to return from the evaporator to the heat exchanger after heat exchange.
  • the present invention provides a refrigeration system that utilizes a heat source instead of a compressor to achieve refrigeration.
  • the present invention provides a refrigeration system, comprising: a heat source designed to provide heat energy; a power generator designed to heat up a refrigerating medium with the heat source arranged in the power generator, so that the temperature and pressure of the refrigerating medium are increased and the refrigerating medium is vaporized; a condenser into which the liquid refrigerating medium flows from the power generator under the action of the pressure difference resulted from the high temperature in the power generator, and in which the temperature of the liquid refrigerating medium is decreased; a throttle valve which controls the liquid refrigerating medium flowing through the condenser to jet out from it under the action of the pressure difference, so that the pressure of the liquid refrigerating medium is decreased under the jet action and the liquid refrigerating medium absorbs heat; an evaporator into which the low-temperature and low-pressure refrigerating medium is jetted from the throttle valve, and in which the low-temperature and low-pressure refrigerating medium exchanges heat with a refrigeration output in the evaporator and
  • a variety of common heat sources can be used to heat up the working medium, so that the working medium can flow from the power generator into the evaporator; in addition, gravity is used as the power for driving the working medium to flow back from the evaporator into the power generator.
  • gravity action the upper valve and lower valve open in alternate, so that the pressure difference between the power generator and the evaporator is balanced twice with the reservoir, and thereby the liquid working medium is returned from the evaporator to the power generator after heat exchange and circulates. In that way, the difficulty in the return of the working medium as a result of the pressure difference between the power generator and the evaporator is solved reasonably.
  • FIG. 1 is a schematic diagram of a first embodiment of the refrigeration system in the present invention.
  • FIG. 2 is a schematic diagram of a working state of the liquid working medium, in which the upper valve is open.
  • FIG. 3 is a schematic diagram of a second embodiment of the refrigeration system in the present invention.
  • FIG. 4 is a schematic diagram of a refrigeration system in the prior art.
  • the refrigeration system in the present invention comprises: a heat source 1 that is designed to provide heat energy; a power generator 2 that contains a liquid working medium 3 and a gaseous working medium 4 , a condenser 5 , a throttle valve 7 , an evaporator 8 , a refrigeration output 10 , and a liquid working medium return unit 15 .
  • the power generator 2 utilizes the heat source 1 arranged in it to heat up the refrigerating medium comprising the liquid working medium 3 and gaseous working medium 4 , so that the temperature and pressure of the refrigerating medium are increased and the refrigerating medium is vaporized.
  • the liquid refrigerating medium 3 flows from the power generator 2 into the condenser, and the temperature of the liquid refrigerating medium is decreased in the condenser 5 .
  • the throttle valve 7 controls the liquid refrigerating medium flowing through the condenser to jet out from it under the action of the pressure difference, so that the pressure of the liquid refrigerating medium is decreased under the jet action and the liquid refrigerating medium absorbs heat.
  • the low-temperature and low-pressure refrigerating medium is jetted from the throttle valve 7 into the evaporator 8 , exchanges heat with the refrigeration output 10 in the evaporator, and is accumulated in a form of liquid refrigerating medium on the bottom of the evaporator 8 .
  • the liquid working medium accumulated on the bottom of the evaporator 8 flows back freely to the power generator under gravity action via the liquid working medium return unit 15 .
  • the liquid working medium return unit 15 comprises an upper valve 12 , a reservoir 13 , and a lower valve 14 , wherein, the upper end of the reservoir 13 is connected to the evaporator 8 via the upper valve 12 , the lower end of the reservoir 13 is connected to the power generator 2 via the lower valve 14 , and the upper valve 12 and lower valve 14 open sequentially, but don't open at the same time.
  • the evaporator 8 , liquid working medium return unit 15 , and power generator 2 are arranged from top to bottom in a vertical direction in turn.
  • the working process of the entire system is as follows: the liquid working medium 3 is heated up in the power generator 2 , so that the temperature and pressure of the liquid working medium 3 are increased and the liquid working medium 3 is vaporized.
  • the evaporator side is in low-temperature and low-pressure state, while the power generator side is in high-temperature and high-pressure state.
  • the temperature is 20° C. at the evaporator side and 60° C. at the power generator side.
  • the pressure at 20° C. is 0.4689 MPa and 1.427 MPa at 60° C., which is to say, the pressure difference between the evaporator side and the power generator side is 0.958 MPa.
  • the liquid working medium that is not vaporized in the lower part of the power generator flows out of the power generator 2 into the condenser 5 through a pipe outlet below the gas-liquid interface in the power generator 2 .
  • the temperature of the liquid working medium drops, but the liquid working medium is still in high-pressure state.
  • the high-pressure liquid working medium is jetted out through a throttle valve into the evaporator 8 .
  • the pressure of the liquid working medium drops, and the liquid working medium is vaporized and absorbs the heat from the refrigeration output in the evaporator; thus, heat exchange is accomplished.
  • a liquid working medium return unit 15 is arranged between the power generator and the evaporator.
  • the liquid working medium return unit 15 comprises an upper valve 12 (e.g., in the form of an electronic switch), a reservoir 13 , and a lower valve 14 (e.g., in the form of an electronic switch).
  • the upper end of the reservoir 13 is connected to the evaporator 8 via the upper valve 12
  • the lower end of the reservoir 13 is connected to the power generator 2 via the lower valve 14 .
  • the evaporator 8 , liquid working medium return unit 15 , and power generator 2 are arranged from top to bottom in a vertical direction in turn.
  • the gaseous working medium in the evaporator becomes low-temperature and low-pressure liquid working medium.
  • the liquid working medium is accumulated on the bottom of the evaporator.
  • the upper valve 12 connected to the bottom of the evaporator 8 opens at a specific time interval. Within a preset time after the upper valve is opened, the pressure between the reservoir 13 and the evaporator 8 will be balanced, and the liquid working medium on the bottom of the reservoir 13 will flow back freely into the reservoir 13 under gravity action, as shown in FIG. 2 . Then, the upper valve 12 is closed.
  • the lower valve 14 is opened; within a preset time after the lower valve 14 is opened, the pressure between the reservoir 13 and the power generator 2 will be balanced, and the liquid working medium in the reservoir 13 will flow back freely into the power generator 2 under gravity action in the same way. Then, the lower valve 14 is closed. As the upper valve and lower valve are opened in alternate, pressure isolation is achieved between the power generator and the evaporator. With the liquid working medium return unit 15 , the pressure difference between the power generator and the evaporator is maintained so that the system operation can continue, and the liquid working medium can flow back. A refrigeration cycle is accomplished through the above process.
  • the working medium can flow back from the evaporator to the power generator solely under gravity action, and a preset pressure difference is maintained between the power generator and the evaporator by means of the upper valve and lower valve, so that the entire system can continue its operation.
  • the time interval at which the valves are opened can be controlled by means of a controller.
  • water cooling or air cooling is used in the present invention.
  • two condensers connected in series are employed for duplex cooling, i.e., a heat storage water tank 20 , followed by an air-cooled condenser.
  • the refrigerating medium can be ammonia, F12, F22, F502, liquid nitrogen, or 134A, etc.
  • the compressor-free refrigeration system in the present invention has simple structure and lower cost, and is applicable to a variety of application scenarios.
  • the refrigeration system disclosed in the present invention can save energy. It can utilize a variety of common heat sources, such as water heaters and waste heat of boilers, etc., and doesn't consume electrical energy heavily when compared with compression refrigeration systems. In addition, the refrigeration system disclosed in the present invention doesn't have noise produced by compressor, and has low cost and wide applicability.
  • the implementers can employ different heat sources, such as solar heat source, electric heat source, or waste heat of boiler, etc., according to the local conditions.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
US14/123,597 2011-10-27 2011-11-04 Compressor-free refrigeration system powered by heat source Abandoned US20140223957A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN2011081400 2011-10-27
CN2011/081400 2011-10-27
PCT/CN2011/081806 WO2013060044A1 (zh) 2011-10-27 2011-11-04 用热源作动力的无压缩机的制冷系统

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US20140223957A1 true US20140223957A1 (en) 2014-08-14

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US14/123,597 Abandoned US20140223957A1 (en) 2011-10-27 2011-11-04 Compressor-free refrigeration system powered by heat source

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US (1) US20140223957A1 (enExample)
EP (1) EP2778568A1 (enExample)
JP (1) JP2014531013A (enExample)
WO (1) WO2013060044A1 (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106764990A (zh) * 2016-11-27 2017-05-31 侴乔力 梯级回热型凝汽源热泵驱动蒸汽锅炉
CN107120151A (zh) * 2017-05-11 2017-09-01 北京建筑大学 一种基于压力发电的自循环废热利用系统
CN107339828A (zh) * 2017-08-28 2017-11-10 张洪延 发电制冷装置
CN108151357A (zh) * 2017-11-29 2018-06-12 卡诺冷暖（广州）科技有限公司 一种加热式制冷循环方法及其装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019196840A (ja) * 2016-09-09 2019-11-14 株式会社デンソー 機器温調装置
CN106766357A (zh) * 2016-12-14 2017-05-31 大连理工大学 一种制冷剂泵驱动的太阳能pvt热电联供系统
CN107477912A (zh) * 2017-08-28 2017-12-15 吴伟营 加热式制冷循环系统
CN107883605A (zh) * 2017-12-07 2018-04-06 卡诺冷暖（广州）科技有限公司 一种加热式制冷设备
CN109855217B (zh) * 2019-02-01 2021-03-26 丁建民 一种无压缩机的热能空调及其空气调节方法

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106764990A (zh) * 2016-11-27 2017-05-31 侴乔力 梯级回热型凝汽源热泵驱动蒸汽锅炉
CN107120151A (zh) * 2017-05-11 2017-09-01 北京建筑大学 一种基于压力发电的自循环废热利用系统
CN107339828A (zh) * 2017-08-28 2017-11-10 张洪延 发电制冷装置
CN108151357A (zh) * 2017-11-29 2018-06-12 卡诺冷暖（广州）科技有限公司 一种加热式制冷循环方法及其装置

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JP2014531013A (ja) 2014-11-20
WO2013060044A1 (zh) 2013-05-02
EP2778568A1 (en) 2014-09-17

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