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EP2989397B1 - Procédé et dispositif de refroidissement d'un moteur - Google Patents

Procédé et dispositif de refroidissement d'un moteur Download PDF

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Publication number
EP2989397B1
EP2989397B1 EP14714996.7A EP14714996A EP2989397B1 EP 2989397 B1 EP2989397 B1 EP 2989397B1 EP 14714996 A EP14714996 A EP 14714996A EP 2989397 B1 EP2989397 B1 EP 2989397B1
Authority
EP
European Patent Office
Prior art keywords
refrigerant
compression stage
stage
motor
fraction
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
EP14714996.7A
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German (de)
English (en)
Other versions
EP2989397A1 (fr
Inventor
Max Meise
Simon Klink
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Publication of EP2989397A1 publication Critical patent/EP2989397A1/fr
Application granted granted Critical
Publication of EP2989397B1 publication Critical patent/EP2989397B1/fr
Active legal-status Critical Current
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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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • 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
    • F25B31/00—Compressor arrangements
    • F25B31/02—Compressor arrangements of motor-compressor units
    • F25B31/026—Compressor arrangements of motor-compressor units with compressor of rotary type
    • 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
    • F25B31/00—Compressor arrangements
    • F25B31/006—Cooling of compressor or motor
    • 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
    • F25B49/025—Motor control 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • 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—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators
    • 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
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator

Definitions

  • the invention relates to a method for cooling an engine according to the preamble of claim 1 and an apparatus for performing the method.
  • Such a refrigerant circuit with a two-stage compressor is used, for example, in connection with heat pumps.
  • the two compression stages of the compressor are driven by a motor that is mechanically connected to it.
  • the refrigerant gas is compressed from a low level to a medium level.
  • the pressure level is then increased further until the refrigerant has a high pressure level.
  • Heat can then be released from the refrigerant via a condenser connected downstream of the second compression stage, which is then expanded and can again absorb heat in an evaporator in order to be supplied in gaseous form to the first compression stage of the compressor.
  • such a refrigerant circuit can be used to heat or cool a room, for example.
  • the refrigerant also serves to cool the engine, which can be operated at an optimal operating temperature.
  • the motor of the compressor is usually cooled either by the coolant drawn in by the compressor or by the gaseous coolant that has already been compressed.
  • the engine waste heat is fed to the gaseous refrigerant either directly before or immediately after compression.
  • Refrigerant circuits with two-stage compressors which comprise a first compression stage and a second compression stage, are known to cool the engine with the refrigerant which is at a medium pressure level. This then happens either through the suction gas upstream of the second or second compression stage or through the compressed gas at the first or first compression stage.
  • the invention is based on the object of eliminating the disadvantages of the prior art and, in particular, of specifying a method and a device for cooling an engine in which the waste heat of the engine enters the cooling circuit can be returned without having a negative impact on the efficiency of the overall system.
  • the manufacturing effort and the regulatory effort should be as low as possible and be made with as few components as possible.
  • a method for cooling at least one engine that drives at least one at least two-stage compressor of a refrigerant circuit, which comprises at least a first compression stage and a second compression stage, wherein a refrigerant is passed through the refrigerant circuit, which in the first compression stage from a low pressure level to a medium pressure level and in the second compression stage from the medium pressure level to a high pressure level and after the second compression stage is released to the medium pressure level with heat
  • the engine is cooled with a two-phase refrigerant main flow, which the medium Has pressure level.
  • the two-phase main refrigerant flow contains both gaseous and liquid refrigerants. Since the main refrigerant flow, i.e. usually the entire refrigerant flow, is used for engine cooling, no additional expansion valves are required. Accordingly, no relevant regulation is required.
  • the waste heat dissipated by the engine has no negative impact on efficiency, since it has no negative impact on either the pressure side or the suction side of the compression stages.
  • the process is used between two of the compression levels. If there is more than one refrigerant compressor, the method can be used between two refrigerant compressors. It can also do more than one engine be cooled, where appropriate, each engine can be assigned its own refrigerant circuit.
  • the main refrigerant flow is separated into a liquid refrigerant part and a gaseous refrigerant part after cooling the engine, the gaseous refrigerant part being fed to the second compression stage and the liquid refrigerant part being fed to the first compression stage of the two-stage compressor.
  • the two-phase refrigerant main flow is separated into the two phases, the gaseous fraction being further compressed in the second compression stage.
  • this enables the gaseous refrigerant to be compressed very efficiently to a high pressure at high temperature.
  • the refrigerant is preferably evaporated before the first compression stage with the absorption of heat and condensed after the second compression stage with the emission of heat.
  • the liquid refrigerant part is expanded with subsequent evaporation in an evaporator, in which heat can be absorbed, for example, from the environment.
  • the previously liquid refrigerant part also changes into the gaseous phase and is supplied in gaseous form to the first compression stage of the two-stage compressor, where it is compressed and heated.
  • a condenser can be provided, for example, in which the previously gaseous refrigerant part is condensed and heat is emitted, for example, to the environment. From there, the refrigerant is carried on under high pressure and partially liquefied and finally expanded to the medium pressure level.
  • the refrigerant part after the first compression stage with that of the second compression stage Heat emission coming refrigerant part merged before use to cool the engine. This combines the two refrigerant parts so that the entire refrigerant flow is available for cooling the engine.
  • the refrigerant part is fed directly to the second compression step after the first compression stage, the gaseous middle part after cooling the engine being fed to the second compression stage and being brought together with the refrigerant part coming from the first compression stage, the refrigerant -The main flow-forming refrigerant coming from the second compression stage after heat is used to cool the engine.
  • the invention provides that it has a motor and a refrigerant circuit in which a two-stage compressor with a first compression stage and a second compression stage is arranged , which can be driven by the engine, an engine cooling system being integrated into the refrigerant circuit in such a way that a main refrigerant flow can flow through it, a phase separation element being arranged in the flow direction behind the engine cooling system, which is connected via a suction gas line for a gaseous refrigerant part with the second compression stage and is connected to the first compression stage of the two-stage refrigerant compressor via a first line for a liquid refrigerant part.
  • the entire refrigerant which is at a medium pressure level, can be used to cool the engine and the waste heat can be returned to the refrigerant circuit.
  • This does not have a negative impact on efficiency, since with the help of the phase separation element after the absorption of the engine's waste heat or after the engine cooling, a separation into a gaseous and a liquid refrigerant part takes place, whereby only the gaseous refrigerant part of the second compression stage is fed and thus further compressed. It can therefore be operated with high efficiency.
  • an evaporator and, if appropriate, a throttle element and, if appropriate, further components are arranged in the first line before the first compression stage. This allows the refrigerant part, which has been liquid up to that point, to be expanded and evaporated so that it can be supplied in gaseous form to the first compression stage.
  • the evaporator absorbs heat from an environment, which is thereby cooled.
  • the other components include, for example, filters or the like.
  • a condenser and optionally a throttle element and optionally further components are arranged in a second line of the refrigerant circuit after the second compression stage.
  • heat can be released from the gaseous refrigerant part to the environment after the second compression stage, as a result of which this refrigerant part is at least partially liquefied.
  • the subsequently arranged throttle element which can be designed, for example, as a simple throttle or as an expansion valve, then relaxes this refrigerant part, so that it can be used in liquid and / or gaseous form for engine cooling at a medium pressure level.
  • the other components can be designed, for example, as cooling elements for power electronics or the like.
  • a mixing device is arranged in the refrigerant circuit before the engine cooling, which is connected to a compressed gas line coming from the first compression stage and the second line.
  • the mixer coming from the first compression stage thus meets Refrigerant part and the refrigerant part coming from the second compression stage and can be routed together from there to the engine cooling.
  • the entire refrigerant flow thus serves to cool the engine.
  • the second line is connected to the engine cooling, a compressed gas line coming from the first compression stage opening into the suction gas line leading to the second compression stage.
  • the gaseous refrigerant part after the phase separation element can be combined with the refrigerant part running from the first to the second compression stage before the second compression stage. Even with this simplified structure, the entire refrigerant flow is led to the engine cooling system and used there to absorb waste heat. However, the refrigerant part coming from the first compression stage is not combined with the refrigerant part coming from the second compression stage directly before the engine cooling, but also only passes through the second compression stage.
  • Further components can be arranged in a refrigerant line between the engine cooling and the phase separating element. These are, for example, throttle elements and / or additional cooling elements, which are used, for example, to cool elements of power electronics.
  • the refrigerant compressor preferably has more than two compression stages, the method according to one of claims 1 to 5 being applied between two of the compression stages. A very strong cooling can also be achieved in this way.
  • the device has two refrigerant compressors, the method according to one of claims 1 to 5 being used between the refrigerant compressors or between compression stages of the refrigerant compressors, optionally with more than one engine cooling.
  • the device can therefore be used very universally.
  • FIG. 1 schematically shows a refrigerant circuit 1 of a heat pump, which has a two-stage compressor 2 with a first compression stage 3 and a second compression stage 4.
  • the two-stage compressor 2 is operated with a motor 5, a mechanical connection between the motor 5 and the compression stages 3, 4 of the two-stage compressor 2 not being shown for reasons of clarity.
  • the pressure level of a refrigerant is raised from a first pressure level first to a medium pressure level and then to a high pressure level.
  • a fluid that is liquid under excess pressure and becomes gaseous after pressure relief and heat absorption is used as the refrigerant.
  • the refrigerant is supplied, for example, in gaseous form and at low pressure to the first compression stage 3 of the compressor 2, where it is brought to a medium pressure level, while being heated at the same time.
  • a gaseous refrigerant portion then reaches the refrigerant circuit via a compressed gas line 6 Figure 1 to a mixing device 7 and is merged there with a refrigerant part coming from the second compression stage 4.
  • This refrigerant part had been supplied to the second compression stage of the compressor 2 in gaseous form and with a medium pressure level and was brought to a high pressure level in the second compression stage 4 while being heated.
  • the gaseous refrigerant part is then fed to a condenser 9 via a second line 8 after the second compression stage 4. There is a release of heat from the refrigerant part to an environment or heat sink 10.
  • the condensed heat medium part which can have both liquid and gaseous phases, is then expanded with the aid of a throttle element 11, which is designed, for example, as an expansion valve, to the average pressure level with which this coolant part arrives at the mixing device 7 and is brought together with the refrigerant part coming from the first compression stage 3.
  • a throttle element 11 which is designed, for example, as an expansion valve, to the average pressure level with which this coolant part arrives at the mixing device 7 and is brought together with the refrigerant part coming from the first compression stage 3.
  • the merged refrigerant parts that is to say the main refrigerant flow, which comprises the entire volume flow, passes from the mixing device 7 to an engine cooling of the engine 5 and absorbs heat from the engine 5 there.
  • the main refrigerant stream is then separated in a phase separation element 12 into the gaseous refrigerant part and the liquid refrigerant part.
  • the gaseous refrigerant part is then again fed to the second compression stage 4.
  • the liquid refrigerant part is expanded with the aid of a throttle element 13, which in turn can be designed as an expansion valve, and fed to an evaporator 14 at low pressure and low temperature, in which the liquid refrigerant part is converted into a gaseous phase.
  • the evaporator 14 absorbs heat from the environment or from a heat source 15, which is absorbed by the refrigerant part.
  • the throttle element 13 and the evaporator 14 are arranged in a first line 16, which connects the phase separating element 12 to the first compression stage 3 of the two-stage compressor 2. In the first compression stage 3 there is then an increase in the pressure of the refrigerant part evaporated in the evaporator 14, so that it can in turn be fed to the mixing device 7 at a medium pressure level and at an elevated temperature.
  • FIG. 2 shows an alternative preferred embodiment, in which corresponding elements are provided with the same reference numerals.
  • the refrigerant part is not fed to a mixing device upstream of the engine cooling, but rather directly to the second compression stage 4. Since the gaseous refrigerant part coming from the phase separation element 12 also The second compression stage 4 is supplied, the main refrigerant flow in the second compression stage 4 is brought to the high pressure level and heated. After heat has been given off and condensation in the condenser 9 and subsequent expansion via the throttle element 11, the main refrigerant flow, which has gaseous and liquid constituents, then cools the motor 5 and can absorb heat there.
  • the liquid refrigerant part separated from the main flow of refrigerant by the phase separating element 12 is guided via the first line 16 and is first expanded to a low pressure level with the help of the throttle element 13. Evaporation then takes place in the evaporator 14, so that it is finally supplied in gaseous form to the first compression stage 3 of the compressor 3 and is brought to an intermediate pressure level there with simultaneous heating, in order then to reach the second compression stage 4.
  • the motor which is required to drive the two-stage compressor, is cooled with the aid of the main refrigerant flow, that is to say through the entire refrigerant.
  • An additional bypass connection to branch off some of the refrigerant to cool the engine is not required. Accordingly, there is a simplified structure, in particular by reducing the number of expansion valves required and thus simpler regulation.
  • the engine's waste heat is returned to the refrigerant circuit without reducing the efficiency of the overall system due to the phase separation that occurs after the waste heat has been absorbed.
  • the procedure according to the invention can be adapted to a refrigeration cycle with a single-stage compressor with relatively little effort, wherein an intermediate injection and an internal heat exchanger or also an intermediate injection and a phase separation can be used in a phase separation element.
  • the refrigerant circuit can be reversed for defrosting and / or for cooling operation, but the phase separation element must always be flowed through in the same direction.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (11)

  1. Procédé de refroidissement d'un moteur, qui entraîne au moins un compresseur (2) au moins à deux étages d'un circuit de réfrigérant (1) qui comprend au moins un premier étage de compression (3) et un deuxième étage de compression (4), un réfrigérant étant guidé à travers le circuit de réfrigérant (1), lequel est amené dans le premier étage de compression (3) d'un niveau de pression bas à un niveau de pression moyen et dans le deuxième étage de compression (4) du niveau de pression moyen à un niveau de pression élevé et qui est détendu à la suite du deuxième étage de compression (4) par dégagement de chaleur au niveau de pression moyen,
    caractérisé en ce que
    le moteur (5) est refroidi avec le courant de réfrigérant total qui circule dans le circuit de réfrigérant en tant que courant principal de réfrigérant à deux phases, qui présente le niveau de pression moyen.
  2. Procédé selon la revendication 1, caractérisé en ce que le courant principal de réfrigérant, après le refroidissement du moteur (5), est séparé en une partie de réfrigérant liquide et une partie de réfrigérant gazeuse, la partie de réfrigérant gazeuse étant acheminée au deuxième étage de compression (4) et la partie de réfrigérant liquide étant acheminée au premier étage de compression (3) du compresseur (2) à deux étages.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le réfrigérant est évaporé avant le premier étage de compression (3) avec absorption de chaleur et est condensé après le deuxième étage de compression (4) avec dégagement de chaleur.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la partie de réfrigérant après le premier étage de compression (3) est réunie avec la partie de réfrigérant provenant du deuxième étage de compression (4) après dégagement de chaleur avant l'utilisation pour le refroidissement du moteur (5).
  5. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la partie de réfrigérant après le premier étage de compression (3) est acheminée directement au deuxième étage de compression (4), la partie de réfrigérant gazeuse après le refroidissement du moteur (5) étant acheminée au deuxième étage de compression (4) et étant réunie avec la partie de réfrigérant provenant du premier étage de compression (3) et le réfrigérant formant le courant principal de réfrigérant, provenant du deuxième étage de compression (4), étant utilisé après dégagement de chaleur pour refroidir le moteur (5).
  6. Dispositif, en particulier pompe à chaleur à deux étages, appareil de climatisation ou installation frigorifique, pour mettre en œuvre un procédé selon les revendications 1 à 5, comprenant un moteur (5) et un circuit de réfrigérant (1) dans lequel est disposé un compresseur (2) à deux étages avec un premier étage de compression (3) et un deuxième étage de compression (4), qui peut être entraîné par le moteur (5), caractérisé en ce qu'un refroidissement du moteur est incorporé dans le circuit de réfrigérant (1) de telle sorte qu'il puisse être parcouru par tout l'écoulement de courant de réfrigérant qui circule dans le circuit de réfrigérant sous forme de courant principal de réfrigérant à deux phases, un élément de séparation de phase (12) étant disposé dans la direction d'écoulement derrière le refroidissement du moteur, lequel est connecté par le biais d'une conduite de gaz d'aspiration (17) pour une partie de réfrigérant gazeuse au deuxième étage de compression (4) et par le biais d'une première conduite (16) pour une partie de réfrigérant liquide au premier étage de compression (3) du compresseur de réfrigérant (2) à deux étages.
  7. Dispositif selon la revendication 6, caractérisé en ce qu'un évaporateur (14) et éventuellement un élément d'étranglement (13) ainsi qu'éventuellement d'autres composants sont disposés dans la première conduite (16) avant le premier étage de compression (3).
  8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que dans une deuxième conduite (8) du circuit de réfrigérant (1) après le deuxième étage de compression (4) sont disposés un condenseur (9) et éventuellement un élément d'étranglement (11) ainsi qu'éventuellement d'autres composants.
  9. Dispositif selon l'une quelconque des revendications 6 à 8, caractérisé en ce que dans le circuit de réfrigérant (8) avant le refroidissement du moteur est disposé un dispositif de mélange qui est connecté à une conduite de gaz sous pression (6) provenant du premier étage de compression (3) et à la deuxième conduite (8).
  10. Dispositif selon l'une quelconque des revendications 6 à 8, caractérisé en ce que la deuxième conduite (8) est connectée au refroidissement du moteur, une conduite de gaz sous pression (6) provenant du premier étage de compression (3) débouchant dans la conduite de gaz d'aspiration (17) conduisant au deuxième étage de compression (4).
  11. Dispositif selon l'une quelconque des revendications 6 à 8, caractérisé en ce que des composants supplémentaires sont disposés dans une conduite de réfrigérant entre le refroidissement du moteur (5) et l'élément de séparation de phase (12).
EP14714996.7A 2013-04-23 2014-04-02 Procédé et dispositif de refroidissement d'un moteur Active EP2989397B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013207344.5A DE102013207344A1 (de) 2013-04-23 2013-04-23 Verfahren und Vorrichtung zum Kühlen eines Motors
PCT/EP2014/056567 WO2014173641A1 (fr) 2013-04-23 2014-04-02 Procédé et dispositif de refroidissement d'un moteur

Publications (2)

Publication Number Publication Date
EP2989397A1 EP2989397A1 (fr) 2016-03-02
EP2989397B1 true EP2989397B1 (fr) 2020-06-10

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EP14714996.7A Active EP2989397B1 (fr) 2013-04-23 2014-04-02 Procédé et dispositif de refroidissement d'un moteur

Country Status (5)

Country Link
US (1) US20160273812A1 (fr)
EP (1) EP2989397B1 (fr)
CN (1) CN105143790B (fr)
DE (1) DE102013207344A1 (fr)
WO (1) WO2014173641A1 (fr)

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Publication number Priority date Publication date Assignee Title
US10391835B2 (en) * 2015-05-15 2019-08-27 Ford Global Technologies, Llc System and method for de-icing a heat pump
EP3692309A1 (fr) * 2017-10-04 2020-08-12 BITZER Kühlmaschinenbau GmbH Système de compresseur frigorifique

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US2746269A (en) * 1955-03-17 1956-05-22 Trane Co Plural stage refrigerating apparatus
US3232074A (en) * 1963-11-04 1966-02-01 American Radiator & Standard Cooling means for dynamoelectric machines
FR2620205A1 (fr) * 1987-09-04 1989-03-10 Zimmern Bernard Compresseur hermetique pour refrigeration avec moteur refroidi par gaz d'economiseur
US6070421A (en) * 1996-04-18 2000-06-06 Samjin Co., Ltd. 5 or 8 kW refrigerating system and centrifugal compressor assembly for said system
CA2253195A1 (fr) * 1996-04-18 1997-10-23 Zakrytoe Aktsionernoe Obschestvo Nauchno-Proisvodstvennoe Obiedinenie "V Ic" Installation de refroidissement d'une puissance de 5 et 8 kw et systeme de compresseur centrifuge pour cette installation
KR100430091B1 (ko) * 1997-07-10 2004-07-15 엘지.필립스 엘시디 주식회사 액정표시장치
KR100288315B1 (ko) * 1999-03-15 2001-04-16 김평길 2단 원심압축기
US7600390B2 (en) * 2004-10-21 2009-10-13 Tecumseh Products Company Method and apparatus for control of carbon dioxide gas cooler pressure by use of a two-stage compressor
CN201488382U (zh) * 2009-09-11 2010-05-26 河南千年冷冻设备有限公司 一种双级制冷系统

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Also Published As

Publication number Publication date
DE102013207344A1 (de) 2014-10-23
EP2989397A1 (fr) 2016-03-02
US20160273812A1 (en) 2016-09-22
WO2014173641A1 (fr) 2014-10-30
CN105143790B (zh) 2018-02-23
CN105143790A (zh) 2015-12-09

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