EP3670909B1 - Air cooling machine - Google Patents

Air cooling machine Download PDF

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Publication number
EP3670909B1
EP3670909B1 EP19215224.7A EP19215224A EP3670909B1 EP 3670909 B1 EP3670909 B1 EP 3670909B1 EP 19215224 A EP19215224 A EP 19215224A EP 3670909 B1 EP3670909 B1 EP 3670909B1
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EP
European Patent Office
Prior art keywords
air
cooling chamber
valve
compressor
heat exchanger
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP19215224.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3670909A1 (en
Inventor
Vladyslav Tsyplakov
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.)
Mirai Intex SAGL
Original Assignee
Mirai Intex SAGL
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Publication date
Application filed by Mirai Intex SAGL filed Critical Mirai Intex SAGL
Publication of EP3670909A1 publication Critical patent/EP3670909A1/en
Application granted granted Critical
Publication of EP3670909B1 publication Critical patent/EP3670909B1/en
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Classifications

    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/004—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0085—Systems using a compressed air circuit
    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • 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
    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/06—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using expanders
    • 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
    • F25B2400/00—Component parts or details not otherwise provided for in this subclass
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0403—Refrigeration circuit bypassing means for condensers
    • 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
    • F25B2400/00—Component parts or details not otherwise provided for in this subclass
    • F25B2400/14—Power generation using energy from the expansion of the refrigerant
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves

Definitions

  • the invention relates to an air cooling machine comprising a compressor whose inlet is connected to an air outlet of a cooling chamber via a heat exchanger, whereby the compressor outlet is connected to an air inlet of the cooling chamber via a cooler, the heat exchanger and a turbodetander, whereby the turbodetander is coupled to a motor of the compressor.
  • closed cycle regenerative gas cooling machines (see I. A. Sakunin, "Cooling machines", Mashinostroenie, 1985, pp. 360-367 , Fig. 8.2), which include a compressor, an embedded cooling device, a detander, a heat exchanger, a motor and a regenerator.
  • the gas flows into the compressor at a certain temperature and pressure, it is compressed and consequently its parameters change, the temperature increases. Thereafter, the gas flows to the embedded cooling device where it is cooled by passing water and is conveyed through the regenerator to the detander. Inside the regenerator, heat is removed from the "direct” stream by heating the "return” stream from the heat exchanger.
  • the detander the gas expands and its pressure decreases. Then the gas is supplied to the heat exchanger or a cooling chamber, the gas temperature increases and the gas then passes through the regenerator to the compressor.
  • the required temperatures are achieved by selecting the regeneration depth without increasing the pressure ratios in the compressor.
  • JP 2012 137218 A discloses an air cooling machine which comprises a compressor the inlet of which is connected via a heat exchanger and a dehumidifier to an air outlet from a cooling chamber, whereby the outlet of the compressor is via a cooler, the heat exchanger and a turbodetander connected to the air inlet from the cooling chamber and the turbodetander is coupled to the motor of the compressor. Downstream of the outlet of the compressor, a bypass air conduit is connected via the cooler and a bypass valve.
  • the bypass air conduit leads to the inlet of the turbodetander, whereby downstream of the outlet of the turbodetander there is a continuous bypass air conduit with a bypass valve which ends downstream of the air outlet from the cooling chamber, upstream of the dehumidifier which is arranged outside the cooling chamber and from the outlet of the dehumidifier, the air is guided via the heat exchanger to the inlet of the compressor.
  • the disadvantage of this solution is the fact that the defrosting of the dehumidifier cannot be separated from the defrosting of the air conduits and the heat exchanger.
  • the dehumidifier is arranged outside the cooling chamber in warm environment, which does not allow to remove snow and/or ice, because it will melt and freeze again and again, which results the the dehumidifier failure. Defrosting the heat exchanger will be extremely difficult, since all the air for defrosting flows from the compressor through the bypass air conduit to the turbodetander and from the turbodetander it continues via the dehumidifier and only then to the heat exchanger.
  • EP 1022521 A1 describes the provision of space heating and cooling by means of three four-way valves and the organization of return flow in some parts of the device, but does not allow the achievement of low temperatures because it does not comprise a heat exchanger.
  • the solution is designed to maintain climatic conditions in the room and cannot be used in an air cooling machine, which should achieve low temperatures, i.e. temperatures below -60 °C.
  • air as a cooling agent causes difficulties caused by the formation of ice (icing) at the point of contact with the object to be cooled inside the air cooling machine and in the air conduits. This is due to the water content in air and to its freezing and removal when the temperature drops. Freezing causes a decrease in the operating efficiency of the air cooling machine due to frequent machine maintenance operations and may lead to the machine being withdrawn from service. It should be emphasized that, firstly, removing ice from the air conduits and the devices of the air cooling machine is not an easy task; second, it is necessary to stop the system during this operation. This means that air cooling machines have significant limitations in terms of maximum continuous operation time.
  • the aim of the invention is therefore to reduce or completely eliminate the disadvantages of the background art, particularly to increase the efficiency of an air cooling machine and ensure the least frequent possible interruptions of the machine operation.
  • an air cooling machine whose principle consists in that downstream of an outlet of a compressor is for defrosting air conduits and a heat exchanger connected a bypass air conduit into which is inserted a bypass valve, openable for defrosting the air conduits and/or the heat exchanger, when the supply of cooling air or cooling water to the radiator is stopped, and a bypass air conduit continuing from the bypass valve terminates downstream of an outlet of a turbodetander, upstream of the heat exchanger for supplying warm air from the compressor outlet, whereby a first and second three-way valve or four-way two-position valve is arranged inside a cooling chamber at the air inlet of a cooling chamber and at the air outlet of the cooling chamber, whereby the valve is displaceable for defrosting the air conduits and/or the heat exchanger to a position in which the supplied air does not enter the cooling chamber, but returns from the first and second three-way valve or four-way two-position valve via the exchanger to the compressor, and a dehumi
  • the first and second three-way valve or four-way two-position valve is brought to a position in which the air from the turbodetander returns to the compressor and does not enter the cooling chamber and pass through the dehumidifier.
  • the air conduits or the heat exchanger freeze, they can be heated and the snow and ice can be melted without stopping the machine - only by interrupting the air supply to the cooling chamber and by returning this air to the compressor upstream of the cooling chamber, and the warm compressed air from the compressor is supplied via the bypass valve upstream of the heat exchanger, while at the same time the warm compressed air from the compressor is supplied via a cooler in which the cooling air or water supply is stopped.
  • a valve is arranged in the cooling chamber.
  • Another option for arranging the supply of warm compressed air from the compressor via the bypass valve is the exiting of the continuing bypass air duct from the bypass valve downstream of the outlet of the turbodetander and upstream of the first and second three-way valve or four-way two-position valve.
  • Fig. 1 shows a diagram with a two three-way valve
  • Fig. 2 shows a diagram with a valve in its operating position during cooling
  • Fig. 3 shows a diagram in a position during cleaning the dehumidifier or during defrosting.
  • the air cooling machine comprises a compressor 1, which is coupled to an electric motor 5 by a shaft 51 , and a turbodetander 4 .
  • the turbodetander 4 is coupled to the electric motor 5 by means of a shaft 52 , thus constituting one assembly with the compressor 1 .
  • the motor 5 is coupled to a well-known unillustrated frequency convertor which is part of the machine control system and serves to regulate the revolutions of the compressor 1 , of the motor 5 and of the turbodetander 4 .
  • the inlet 11 of the compressor 1 is connected to an air outlet 92 of the cooling chamber 9 via a heat exchanger 3 (recuperator).
  • the outlet 12 of the compressor 1 is via an air cooler 2 and the heat exchanger 3 connected to the inlet 41 of the turbodetander 4 , whose outlet 42 is connected to the air inlet 91 of the cooling chamber 9 via a first three-way valve 8 or a four-way two-position valve 8
  • a dehumidifier 7 which is connected to the inlet 11 of the compressor 1 via the first three-way valve 8 or four-way two-position valve 8 and heat exchanger 3 .
  • the first and second three-way valve 8 or four-way two-position valve 8 is arranged in the cooling chamber 9 , and so the cooling air which enters the cooling chamber 9 is not heated.
  • a bypass air conduit 61 Downstream of the outlet 12 of the compressor 1, a bypass air conduit 61 is connected to the outlet air conduit, a bypass valve 6 being inserted into the bypass air conduit 61 .
  • the continuing bypass air conduit 62 opens into the air conduit between the air outlet 92 of the cooling chamber 9 and the heat exchanger 3 .
  • the continuing bypass air conduit 62 opens into the cooling chamber 9 in the direction of the air flow downstream of the turbodetander 4 upstream of the first three-way valve 8 or four-way two-position valve 8 , that is, upstream of the air inlet 91 of the cooling chamber 9.
  • the dehumidifier 7 is coupled to a snow and ice conveyor (not shown) which is connected via a pressure valve (not shown) to the environment to which it conveys snow and ice and from which air is sucked through the pressure valve in the event of a pressure drop in the cooling chamber 9 .
  • a duct 21 Through the air cooler 2 is led a duct 21 through which cooling air or cooling water passes.
  • the described parts of the machine are coupled to a control system of the machine (not shown).
  • the control system is provided with a program for automatic control of the machine.
  • Air from the cooling chamber 9 is sucked into the compressor 1 , where it is compressed and its temperature is increasing.
  • compressed air enters the air cooler 2 , where it is cooled by passing part of its thermal energy to the cooling air or water which is supplied to the cooler 2 via the duct 21 and passes through the cooler 2 .
  • the compressed air is led to the heat exchanger 3 , where it is further cooled by heat exchange with an air flow which is discharged from the cooling chamber 9 and passes through the heat exchanger 3 .
  • the cooled compressed air is supplied to the turbodetander 4 , where it expands and consequently is cooled and transmits, through the turbine it rotates, additional torque to the shaft of the machine motor 5 , thereby reducing the power consumption of the motor 5 required for the operation of the compressor 1 .
  • the cold air is led to the cooling chamber 9 , passing through the first and second three-way valve 8 or the four-way two-position valve 8 .
  • the cooling performance is changed by varying the speed of the compressor 1 by means of a frequency converter. Increasing the speed of the compressor 1 increases the pressure in the system and, consequently, the degree of expansion in the turbodetander 4 , which results in a decrease in the temperature downstream of the turbodetander 4 .
  • Supplying cooler air to the cooling chamber 9 reduces also the temperature in the cooling chamber 9 .
  • Air from the cooling chamber 9 is discharged through the dehumidifier 7 , in which moisture from air is collected from air in the form of snow and/or ice.
  • the first and second three-way valve 8 or the four-way two-position valve 8 moves to a position in which the supplied air does not enter the cooling chamber 9, but returns from the first and second three-way valve 8 or the four-way two-position valve 8 via the exchanger 3 to the compressor 1 , as shown in Fig. 3 .
  • snow and/or ice is removed from the dehumidifier 7 , whereby neither the dehumidifier 7 , nor the cooling machine is heated.
  • the first and second three-way valve 8 or the four-way two-position valve 8 After removing snow and/or ice from the dehumidifier 7 , the first and second three-way valve 8 or the four-way two-position valve 8 returns to its operating position and air from the turbodetander 4 is again fed to the cooling chamber 9 and passes through the dehumidifier 7 .
  • the bypass valve 6 opens, the supply of the cooling air or cooling water to the cooler 2 is stopped and the first and second three-way valve 8 or the four-way two-position valve 8 moves to a position in which the supplied air does not enter the cooling chamber 9 , but returns from the first and second three-way valve 8 or the four-way two-position valve 8 through the heat exchanger 3 to the compressor 1 , as shown in Fig. 3 , whereby, before entering the heat exchanger 3 , it is mixed with the warm compressed air which passes through the bypass valve 6 . At the same time, the compressed and warm air from the outlet 12 of the compressor 1 which is not cooled in the cooler 2 enters the heat exchanger 3 .
  • the warm compressed air passing through the bypass valve 6 is supplied downstream of the turbodetander 4 upstream of the first and second three-way valve 8 or the four-way two-position valve 8 , that is, upstream of the air inlet 91 of the cooling chamber 9 .
  • the invention relates to the field of refrigeration technology and can be used for production of cooling units, freezing chambers, rapid cooling systems, air conditioning systems and/or temperature maintenance systems.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19215224.7A 2018-12-19 2019-12-11 Air cooling machine Active EP3670909B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CZ2018-720A CZ308332B6 (cs) 2018-12-19 2018-12-19 Vzduchový chladicí stroj

Publications (2)

Publication Number Publication Date
EP3670909A1 EP3670909A1 (en) 2020-06-24
EP3670909B1 true EP3670909B1 (en) 2024-10-09

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EP19215224.7A Active EP3670909B1 (en) 2018-12-19 2019-12-11 Air cooling machine

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CZ (1) CZ308332B6 (cs)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ308984B6 (cs) * 2020-08-11 2021-11-03 Mirai Intex Sagl Zařízení pro přípravu vzduchu pro vzduchový chladicí stroj
CZ308997B6 (cs) * 2020-10-08 2021-11-10 Mirai Intex Sagl Zařízení pro přípravu čisticího tlakového vzduchu na vzduchovém chladicím stroji
CZ2020548A3 (cs) 2020-10-08 2021-10-27 Mirai Intex Sagl Turbokompresorové soustrojí chladicího stroje
DE102022126025A1 (de) * 2022-10-07 2024-04-18 Transport Innovation Gmbh Mobile Kühltransportvorrichtung, Kraftfahrzeug oder Fahrzeuganhänger hiermit sowie deren Verwendung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1022521B1 (en) * 1997-09-29 2004-11-10 Sharp Kabushiki Kaisha Air cycling type air-conditioner
JP2008298322A (ja) * 2007-05-29 2008-12-11 Mayekawa Mfg Co Ltd 空気冷媒式冷凍装置
JP2019113209A (ja) * 2017-12-21 2019-07-11 三菱重工冷熱株式会社 空気冷媒サイクルを用いた冷却装置

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US4430867A (en) * 1981-08-24 1984-02-14 United Technologies Corporation Air cycle refrigeration system
JP3824757B2 (ja) * 1997-10-24 2006-09-20 鹿島建設株式会社 空気冷媒式冷凍装置
RU2156929C1 (ru) * 1999-12-28 2000-09-27 Панин Александр Андреевич Воздушная холодильная установка, турбодетандер-электрокомпрессор воздушной холодильной установки и турбинное колесо турбодетандера
US6327865B1 (en) * 2000-08-25 2001-12-11 Praxair Technology, Inc. Refrigeration system with coupling fluid stabilizing circuit
JP3747370B2 (ja) * 2002-03-26 2006-02-22 日本発条株式会社 空気サイクル式冷却装置
JPWO2006011297A1 (ja) * 2004-07-30 2008-05-01 三菱重工業株式会社 空気冷媒式冷却装置
JP2010025438A (ja) * 2008-07-18 2010-02-04 Ntn Corp 向流型プレートフィン式熱交換器およびコンテナ用空気サイクル冷凍システム
JP5320382B2 (ja) * 2010-12-24 2013-10-23 株式会社前川製作所 空気冷媒式冷凍装置のデフロスト方法及び装置
JP5934482B2 (ja) * 2011-08-26 2016-06-15 株式会社前川製作所 閉鎖型ガス循環式冷凍装置及びその運転方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1022521B1 (en) * 1997-09-29 2004-11-10 Sharp Kabushiki Kaisha Air cycling type air-conditioner
JP2008298322A (ja) * 2007-05-29 2008-12-11 Mayekawa Mfg Co Ltd 空気冷媒式冷凍装置
JP2019113209A (ja) * 2017-12-21 2019-07-11 三菱重工冷熱株式会社 空気冷媒サイクルを用いた冷却装置

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CZ2018720A3 (cs) 2020-05-20
EP3670909A1 (en) 2020-06-24
CZ308332B6 (cs) 2020-05-20

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