EP2912388B1 - Procédé et dispositif de remplissage à haute cadence d'un circuit frigorifique à l'arrêt - Google Patents

Procédé et dispositif de remplissage à haute cadence d'un circuit frigorifique à l'arrêt Download PDF

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Publication number
EP2912388B1
EP2912388B1 EP13783549.2A EP13783549A EP2912388B1 EP 2912388 B1 EP2912388 B1 EP 2912388B1 EP 13783549 A EP13783549 A EP 13783549A EP 2912388 B1 EP2912388 B1 EP 2912388B1
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EP
European Patent Office
Prior art keywords
refrigerant
mixture
refrigerant fluid
circuit
inorganic
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EP13783549.2A
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German (de)
English (en)
French (fr)
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EP2912388A1 (fr
Inventor
Jean-Michel Garreau
Nicolas Toutain
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Fives Filling and Sealing
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Fives Filling and Sealing
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Publication of EP2912388A1 publication Critical patent/EP2912388A1/fr
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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
    • F25B45/00—Arrangements for charging or discharging 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
    • 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
    • F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component
    • 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
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/001—Charging refrigerant to a 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
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/003—Control issues for charging or collecting refrigerant to or from a 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
    • F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
    • F25B2345/004—Details for charging or discharging refrigerants; Service stations therefor with several tanks to collect or charge a cycle

Definitions

  • the present invention relates to the filling of a refrigeration circuit, or refrigeration circuit, when stopped (for example, a new circuit). It finds for example an application to the filling of a refrigeration circuit such as that of a fixed equipment, such as a heat pump, or of a mobile vehicle, such as the air conditioning of an automobile, on assembly lines. .
  • refrigerants commonly used today, we find for example the fluorinated derivatives of hydrocarbons R134a for cars and heat pumps, or fluorinated mixtures such as R407 and R410 for refrigeration units and heat pumps. These refrigerants are either pure products or mixtures which do not present a risk of separation at low pressure (less than 5 bars for example).
  • HFO1234yf is a fluorinated derivative of hydrocarbons. It nevertheless has several drawbacks such as its flammability, its price, approximately 100 times higher than that of current refrigerants, and its limited availability.
  • a more economical alternative consists of combining conventional fluids so as to obtain a mixture whose GWP complies with the new regulations for a price closer to that of current refrigerants and which can be used without risk of degradation and without major modification of the automotive air conditioning system with at least equal performance.
  • the mixture between two or three fluorinated hydrocarbon derivatives is usual, in particular for heat pumps.
  • these mixtures generally relate to fluids having similar thermodynamic characteristics to guarantee a certain homogeneity of the mixture and not risking separation of the compounds, which would alter the properties of the mixture and therefore the refrigeration performance of the equipment where it is installed.
  • New mixtures are appearing also comprising an inorganic refrigerant such as water, carbon dioxide or ammonia.
  • an inorganic refrigerant such as water, carbon dioxide or ammonia.
  • These mixtures are often good alternatives in terms of safety (because not flammable) to Highly flammable pure hydrocarbons such as butane, propane, pentane. They are also good alternatives to pure inorganic refrigerants which generally involve high pressures (materially incompatible with current automotive circuits).
  • these mixtures do not have sufficient homogeneity during their storage, which poses problems for their transfer because the proportions / compositions must be kept during these handling of refrigerants.
  • These mixtures can be composed of one or more fluorinated hydrocarbon derivatives and one or more inorganic compounds.
  • An example of a particularly advantageous zeotropic mixture is the mixture combining two fluorinated derivatives of hydrocarbons and CO2.
  • documents EP 1431684 A1 and WO 2009/053726 A2 disclose a refrigeration circuit with a refrigerant mixture comprising at least a first refrigerant fluid and at least one inorganic refrigerant fluid, the first refrigerant fluid comprising at least one fluorinated hydrocarbon derivative. They therefore implicitly disclose a filling method according to the preamble of claim 1 and a filling device according to the preamble of claim 6 of the refrigeration circuit at standstill.
  • J A difficulty in using such mixtures lies in defining a process for transferring fluid to the refrigeration circuit, and the device which implements it, which ultimately make it possible to obtain a homogeneous mixture with the proportions and the tolerances recommended by the chemist and having the desired characteristics.
  • the method must be able to be implemented by the device according to a use at high speed and / or on a mobile installation such as, for example, an automobile production line.
  • the refrigerant (the refrigerant) is alternately in the gaseous state and in the liquid state, its changes of state making it possible to take or give up the energy corresponding to its latent heat at the desired location.
  • Such a circuit comprises a compressor, the role of which is to supply the mechanical energy to the refrigerant to allow it to evolve, a condenser in which the refrigerant condenses and transfers the energy to the medium that is to be heated, a pressure reducer which makes it possible to lower the boiling point of the refrigerant and an evaporator in which the refrigerant evaporates taking the energy necessary for the medium which is to be cooled.
  • the aim of the invention is thus to solve the problems listed above. It aims to allow the high-speed filling of a shutdown refrigeration circuit with a mixture of fluids of different types, in particular a mixture of fluids derived from fluorinated hydrocarbons, such as HFC and HFO, and carbon dioxide ( CO2 or R744), so as to obtain in the end a homogeneous refrigerant mixture having advantageous characteristics at a limited cost and adapted to the new environmental constraints.
  • a mixture of fluids of different types in particular a mixture of fluids derived from fluorinated hydrocarbons, such as HFC and HFO, and carbon dioxide ( CO2 or R744)
  • the mixture fluorinated and inorganic
  • This preparation is made progressively, by maintaining a buffer stock level, with the characteristics requested by the chemist, and thus makes it possible to avoid a risk of deterioration of the mixture due to phase separation ( liquid / gas) for example.
  • the object of the invention is therefore, according to a first aspect, to provide a method of filling a refrigeration circuit with fluids of different natures comprising at least one fluorinated hydrocarbon derivative and at least one inorganic refrigerant so as to obtain in the end, a refrigerant in a homogeneous liquid phase at the desired temperature and pressure.
  • the fluorinated hydrocarbon derivative fluid (s) may be designated by the expression first refrigerant fluid.
  • first refrigerant fluid when a single fluorinated hydrocarbon derivative is used, the first refrigerant fluid corresponds to this fluorinated hydrocarbon derivative. But when several fluorinated hydrocarbon derivatives are used, the first refrigerant corresponds to the combination of these fluorinated hydrocarbon derivatives.
  • the subject of the invention is therefore a method according to claim 1, filling a refrigerant circuit at standstill with a refrigerant mixture in this refrigeration circuit comprising at least a first refrigerant fluid and at least one inorganic refrigerant fluid, the first refrigerant fluid. comprising at least one fluorinated hydrocarbon derivative.
  • the mixture of the first refrigerant fluid and the inorganic refrigerant fluid is injected into the refrigeration circuit.
  • the method of the invention comprises one or more of the characteristics presented below, which can be taken in isolation or according to all the technically possible combinations.
  • the mixture of the first refrigerant fluid and the inorganic refrigerant fluid must be carried out before the injection of the refrigerant mixture into the refrigeration circuit.
  • This mixing can be carried out by switching to a pressure several bars (preferably approximately 5 bars) higher than the saturated vapor pressure of the mixture.
  • This mixing can be carried out in parallel with the drawing or the evacuation of the refrigeration circuit in order to achieve high filling rates.
  • the refrigeration circuit is therefore evacuated before filling.
  • the inorganic refrigerant is either in the gas phase or in the liquid phase when added to the first refrigerant.
  • the inorganic refrigerant comprises, or is, carbon dioxide, or ammonia.
  • the process can be used on new or comparable circuits (purged and evacuated circuits). This process can only be used if the refrigeration circuit is stopped (excluding cold production), typically during the production of refrigeration units or circuits on assembly lines.
  • a device for filling a shutdown refrigeration circuit with a mixture of fluids of different natures so to finally obtain a homogeneous mixture in the liquid phase at the desired temperature and pressure, capable of allowing the implementation of the method presented above.
  • this refrigerant mixture comprising at least a first refrigerant fluid and at least one inorganic refrigerant fluid, the first refrigerant fluid comprising at least minus a fluorinated hydrocarbon derivative.
  • the device comprises a mixing device capable of allowing the mixing of a first refrigerating fluid and of an inorganic refrigerating fluid so as to obtain a homogeneous refrigerant mixture in liquid phase, a supply circuit capable of supplying the mixing device as a first refrigerant in liquid phase, a supply circuit capable of allowing the addition of the inorganic refrigerant fluid to the first refrigerant in liquid phase in the mixing device, and a filling device capable of connecting the mixing device to the circuit refrigerant so as to allow the injection of the homogeneous refrigerant mixture into the refrigeration circuit.
  • the technical characteristics of the filling device according to the invention are defined in claim 6.
  • the device comprises one or more of the characteristics presented below, which can be taken in isolation or according to all the technically possible combinations.
  • the supply circuit for the first liquid phase refrigerant comprises at least one supply circuit for a fluorinated hydrocarbon derivative and at least one supply circuit for another fluorinated hydrocarbon derivative.
  • the mixing device comprises a pressure sensor and a temperature sensor capable of supplying the respective pressure and temperature information of the refrigerant mixture in the mixing device, to the regulating means.
  • a vacuum line is provided, in order to allow the evacuation of the firorific circuit before it is filled.
  • the device may include several filling circuits able to connect the mixing device to several refrigeration circuits so as to allow the injection of the homogeneous refrigerant mixture into these refrigeration circuits.
  • the addition of a tank in the filling circuit can be used in order to ensure a permanent availability of mixture.
  • the device therefore makes it possible to initially inject the first refrigerant fluid in liquid phase, consisting of a fluorinated hydrocarbon derivative in liquid phase, or of a premix of fluorinated hydrocarbon derivatives in liquid phase, via a counter , for example mass. Then, the device makes it possible to inject the inorganic refrigerant, such as CO2, in the gas phase, via a meter, for example by mass.
  • Obtaining or having a first refrigerant fluid formed from a homogeneous mixture of several fluorinated hydrocarbon derivatives does not generally pose a problem because they often have similar physical characteristics.
  • Such a pre-mix of the two (or more) fluorinated hydrocarbon derivatives can be carried out on site by dedicated equipment, in masked time. It can also be delivered on site, ready for use, by a refrigerant fluid supplier.
  • the fluorinated derivatives feed circuit advantageously comprises an incondensable trap so as to guarantee the quality of the mixture.
  • the injection of CO2 after that of the fluorinated hydrocarbon derivatives makes it possible to sweep the common section of the supply pipe of the refrigeration circuit in which the premix of the fluorinated hydrocarbon derivatives then circulates the CO2, and d '' inject the premix that remained in this section into the circuit.
  • the common section of piping is then returned to negative pressure to optimize the following cycle.
  • connection of the filling circuit to the refrigeration circuit can be made by an adapter without re-suction of the fluid present in the common section of piping because a rejection of CO2 in the ambient air when the adapter is removed does not pose a problem. no problem (the fluorinated hydrocarbons having been swept away by the CO2).
  • the filling of CO2 in the gas phase is also advantageous for safety reasons. It is in fact used under a limited pressure and, in the event of a leak, it does not undergo any liquid-gas phase transformation liable to generate burns to the operators.
  • gaseous CO2 under a limited pressure less than 20 bars, rather than liquid under a higher pressure, of around 90 bars, also makes it possible to reduce the overall energy consumption by reducing the energy required for compression. and the elimination of the obligation to refrigerate liquid CO2 for keep at a temperature below the critical point temperature (31 ° C under 90 bars).
  • this solution encourages the use of an automatic connection system to the refrigeration circuit with little dead volume between the refrigeration circuit and the isolation valves of the fluorinated fluids and CO2 supply circuits if the desired metering precision is important. and if the quantities to be transferred are low because then the dead volume becomes not insignificant in comparison with the volume of the circuit.
  • This solution makes it possible to dispense with the step of re-suctioning the fluids contained in the common section and avoids multiple connections / disconnections to the circuit causing loss of time, leaks and risk of pollution of the circuit.
  • the device for mixing the first refrigerant fluid and the inorganic refrigerant such as CO2 can comprise a buffer tank.
  • the mixing device may include a second buffer tank such that the mixture circulates back and forth or continuously between the two tanks.
  • obtaining a certain homogeneity also imposes specific pressure and temperature conditions, depending on the mixtures used in order to keep the whole in the liquid phase and in order to promote the dissolution of CO 2 in the mixture.
  • the inorganic refrigerant fluid added to the mixture of fluorinated hydrocarbon derivatives in the buffer tank is liquid and not gaseous.
  • this has less advantage, for example in the case of the use of CO2, because of the safety and pressure constraints for injecting the CO2 in the liquid phase.
  • a buffer tank possibly two buffer tanks, makes it possible to obtain an even higher rate because the transfer of the mixture takes place in a single step under pressure after its preparation in masked time of the refrigeration circuit evacuation. .
  • liquid inorganic refrigerant such as liquid CO2 requires certain precautions. It is in particular necessary to manage the problems of risk of ice and those which result from a high pressure, of approximately 100 bars. Some embodiments are therefore less advantageous, especially if the inorganic refrigerant is CO2.
  • the refrigerant fluid In a stopped refrigeration circuit, the refrigerant fluid is homogeneous in composition but is in the liquid phase in the normally liquid part of the circuit and in the gas phase in the gaseous part of the circuit.
  • the latter In the case of a mixture of fluorinated derivatives of hydrocarbons and CO2, when stopped, the latter partially changes to the gaseous state on the normally liquid part of the circuit, with a partial migration of CO2 to the gaseous part of the circuit. circuit. It is therefore necessary that the mixing of the fluids in the refrigeration circuit can be carried out rapidly when the refrigeration circuit is put into service so that the thermodynamic properties of the mixture can be rapidly achieved.
  • the efficiency of the air conditioning will in fact be lower as long as the CO2 is not dissolved and a quasi-homogeneous mixture is not obtained.
  • the refrigeration circuit since the CO2 molecule is smaller in size than the molecules of fluorinated hydrocarbon derivatives, the refrigeration circuit must be more airtight. Since absolute sealing is not possible in practice, the greater CO2 leakage leads to a change over time in the proportions between the constituents and a lower thermodynamic efficiency of the mixture.
  • the fluorinated derivatives are recovered to be recycled while the CO2, as well as any dissolved air, can be released to the atmosphere (preferably with an evacuation outside the building).
  • the refrigeration circuit compressor works with oil directly dissolved in the refrigeration circuit with the fluids, it is partially driven during recovery refrigerant. In order to be able to reuse the fluids, it is necessary to separate the oil from the fluorinated derivatives. This operation can be carried out before or after the extraction of the CO2 from the mixture. Thus, the recovered and now clean fluid can be reinjected into the machine without additional treatment.
  • the mixture intended to fill the refrigeration circuit 1 comprises two fluids derived from fluorinated hydrocarbons and a single inorganic fluid.
  • the device comprises two supply lines of fluids derived from fluorinated hydrocarbons 28 and 29 similar, each making it possible to connect the device to a source of one of the fluorinated derivatives of hydrocarbons in the liquid state.
  • references 28 and 29 are used both to designate the two supply lines 28, 29 which can be connected to respective sources of the two fluorinated hydrocarbon derivatives in the liquid state, as well as these fluorinated derivatives. of hydrocarbons 28, 29 themselves.
  • the device further comprises an inorganic fluid supply line 27 making it possible to connect the device to a source of CO2 in the gaseous state.
  • the reference 27 is used both to designate the supply line 27 which can be connected to a source of CO2 in the gaseous state, and also to the CO2 27 itself.
  • the device also comprises a vacuum line 30 allowing the refrigeration circuit 1 to be evacuated before it is filled.
  • the feed lines for fluorinated hydrocarbon derivatives 28 and 29 each include in particular a first isolation valve 60, a pressure gauge 63, a mass flowmeter 65, and a second isolation valve 67.
  • the CO2 supply line 27 comprises in particular a first isolation valve 61, a flow regulator 62, a pressure gauge 64, a mass flow meter 66 and a second isolation valve 68.
  • the reservoir 31 is equipped with a recirculation circuit 32 contributing to the mixing of the three components.
  • This recirculation circuit 32 comprises a pump 33, an isolation valve 34 and an exchanger 35 making it possible to maintain the mixture at the required temperature.
  • This reservoir 31 is also equipped with a pressure sensor 36 and a temperature sensor 37.
  • Regulation means receive the pressure and temperature information respectively from the pressure sensor 36 and from the temperature sensor 37, and can regulate this pressure and this temperature by acting in particular on the pump 33, the valve isolation 34 and exchanger 35.
  • the reservoir 31 is connected to the refrigeration circuit 1 through a filling circuit 48 comprising in particular the following members: an isolation valve 38, a mass flowmeter 44, a pressure gauge 45, a filter 46, a distribution block 47.
  • a valve 42 placed upstream of the mass flow meter 44, is connected to a discharge pipe 43.
  • connection between the distribution block 47 and the refrigeration circuit 1 is made by two separate channels, a channel 50 connected to the high pressure part of the refrigeration circuit 1 and a channel 49 connected to the low pressure part of the refrigeration circuit 1.
  • connection of the channels 49 and 50 to the refrigeration circuit 1 can be obtained by the usual means of the state of the art, depending on the type of refrigeration circuit 1 and the field of application.
  • the filling circuit 48 allowing the injection of the refrigerant mixture into the refrigeration circuit 1 after the preparation of the mixture in the mixing device 31, 32, is disconnected from the mixing device 31, 32.
  • each vehicle has a filling circuit 48 on board and each filling circuit 48 can be connected to a single mixing device 31, 32.
  • the invention is not limited to the above description in which it is a question of preparing a mixture comprising two fluids derived from fluorinated hydrocarbons and a single inorganic fluid, and of filling the refrigeration circuit 1 with this mixture.
  • the process of the invention makes it possible, by adjusting the thermodynamic parameters according to the proportions required for the mixture, to maintain the homogeneity of the mixture and a high filling rate.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Air-Conditioning For Vehicles (AREA)
EP13783549.2A 2012-10-26 2013-10-25 Procédé et dispositif de remplissage à haute cadence d'un circuit frigorifique à l'arrêt Active EP2912388B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1260268A FR2997483A3 (fr) 2012-10-26 2012-10-26 Procede et dispositif de remplissage a haute cadence d'un circuit frigorifique avec des fluides de natures differentes de sorte d'obtenir au final un fluide refrigerant homogene
FR1261748A FR2997484B1 (fr) 2012-10-26 2012-12-06 Procede et dispositif de remplissage a haute cadence d'un circuit frigorifique
PCT/EP2013/072439 WO2014064270A1 (fr) 2012-10-26 2013-10-25 Procédé et dispositif de remplissage à haute cadence d'un circuit frigorifique à l'arrêt

Publications (2)

Publication Number Publication Date
EP2912388A1 EP2912388A1 (fr) 2015-09-02
EP2912388B1 true EP2912388B1 (fr) 2021-05-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13783549.2A Active EP2912388B1 (fr) 2012-10-26 2013-10-25 Procédé et dispositif de remplissage à haute cadence d'un circuit frigorifique à l'arrêt

Country Status (5)

Country Link
EP (1) EP2912388B1 (ja)
JP (1) JP2015536438A (ja)
CN (1) CN104870912B (ja)
FR (2) FR2997483A3 (ja)
WO (1) WO2014064270A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106766432A (zh) * 2016-11-20 2017-05-31 嘉兴顾翔制冷设备有限公司 一种制冷液添加装置
CN108444157B (zh) * 2018-04-09 2023-09-22 杨厚成 一种用于声能制冷机的混合工质充注系统及充注方法

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JPH0867870A (ja) * 1994-08-29 1996-03-12 Daikin Ind Ltd 冷媒組成物
JPH08313120A (ja) * 1995-05-15 1996-11-29 Matsushita Electric Ind Co Ltd ３成分混合冷媒充填装置および充填方法
JP3287260B2 (ja) * 1997-04-07 2002-06-04 ダイキン工業株式会社 冷凍装置及びその冷媒充填方法
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JP2004198062A (ja) * 2002-12-20 2004-07-15 Sanyo Electric Co Ltd 冷凍装置
JP2004198063A (ja) * 2002-12-20 2004-07-15 Sanyo Electric Co Ltd 非共沸混合冷媒および冷凍サイクル、並びに冷凍装置
CN100381769C (zh) * 2003-11-25 2008-04-16 大金工业株式会社 冷冻装置
JP4366245B2 (ja) * 2004-05-24 2009-11-18 アイシン精機株式会社 冷媒供給装置
JP2006241221A (ja) * 2005-03-01 2006-09-14 Japan Petroleum Exploration Co Ltd カーエアコン用冷媒組成物
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JP2009222356A (ja) * 2008-03-18 2009-10-01 Daikin Ind Ltd 冷凍装置及び冷媒充填方法
US20090301108A1 (en) * 2008-06-05 2009-12-10 Alstom Technology Ltd Multi-refrigerant cooling system with provisions for adjustment of refrigerant composition

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Publication number Publication date
JP2015536438A (ja) 2015-12-21
FR2997484B1 (fr) 2017-10-06
FR2997483A3 (fr) 2014-05-02
CN104870912B (zh) 2017-06-09
FR2997484A1 (fr) 2014-05-02
WO2014064270A1 (fr) 2014-05-01
CN104870912A (zh) 2015-08-26
EP2912388A1 (fr) 2015-09-02

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