US20070056312A1 - Cooling System - Google Patents

Cooling System Download PDF

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Publication number
US20070056312A1
US20070056312A1 US11/530,459 US53045906A US2007056312A1 US 20070056312 A1 US20070056312 A1 US 20070056312A1 US 53045906 A US53045906 A US 53045906A US 2007056312 A1 US2007056312 A1 US 2007056312A1
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United States
Prior art keywords
refrigerant
circuit
heat exchanger
cooling system
heat medium
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.)
Abandoned
Application number
US11/530,459
Inventor
Makoto Kobayashi
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Sanden Holdings Corp
Original Assignee
Sanden Holdings Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2005262468A priority Critical patent/JP2007071519A/en
Priority to JP2005-262468 priority
Application filed by Sanden Holdings Corp filed Critical Sanden Holdings Corp
Assigned to SANDEN CORPORATION reassignment SANDEN CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOBAYASHI, MAKOTO
Publication of US20070056312A1 publication Critical patent/US20070056312A1/en
Application status is Abandoned legal-status Critical

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B7/00Compression machines, plant, or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B9/00Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • F25B9/008Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2400/00General 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
    • F25B2400/22Refrigeration systems for supermarkets
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B25/00Machines, plant, or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005Machines, plant, or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems

Abstract

A cooling system provided with a first freezing circuit which comprises a first compressor, a first condenser, a first expansion mechanism and a first heat exchanger and in which a first refrigerant is circulated; a second freezing circuit which comprises a second compressor, a second heat exchanger, a second expansion mechanism and an evaporator and in which a second refrigerant is circulated; and a heat medium circuit in which a heat medium for exchanging heat between the first refrigerant of the first heat exchanger and the second refrigerant of the second heat exchanger is circulated, wherein the first freezing circuit is arranged on the exterior side and the second freezing circuit is arranged in the machinery room of a thermal system on the interior side.

Description

    BACKGROUND OF THE INVENTION
  • (i) Field of the Invention
  • The present invention relates to a cooling system for use in air conditioning systems, freezers, refrigerators, refrigerated showcases and the like.
  • (ii) Description of the Related Art
  • Previously, the refrigerant generally used in cooling systems for use in air conditioning systems, freezers, refrigerators, refrigerated showcases and the like was chlorofluorocarbon (CFC). However, the depletion of the ozone layer surrounding the earth by CFC has posed an environmental problem. To address this problem, cooling systems using a natural refrigerant, such as ammonia or carbon dioxide, as an alternative to CFC have come into use in recent years. Known such cooling systems include, for instance, a unified cooling system having a compressor, a condenser, an expansion valve and an evaporator which are installed in a refrigerated showcase, but such a unified cooling system is poor in freezing efficiency.
  • In this connection, as a solution to the problem with the unified cooling system, there are known a cooling system shown in FIG. 3 and a dual cooling system shown in FIG. 4.
  • Each of the cooling systems shown in FIG. 3 and FIG. 4 is configured of an ammonia circuit 51 and a carbon dioxide circuit 52. The ammonia circuit 51 is further provided with a compressor 51 a, a condenser 51 b, an expansion valve 51 c and an external heat exchanger 53. The refrigerant used by the ammonia circuit 51 is ammonia. The carbon dioxide circuit 52 is further provided with a compressor 52 a, an expansion valve 52 b, an evaporator 52 c and the external heat exchanger 53. The refrigerant used by the carbon dioxide circuit 52 is carbon dioxide. The compressor 52 a and the external heat exchanger 53 are connected to each other by piping 53 a, and the expansion valve 52 b and the external heat exchanger 53 are connected to each other by piping 53 b.
  • The cooling system shown in FIG. 3, configured in this way, has the compressor 52 a, the expansion valve 52 b and the evaporator 52 c arranged in a refrigerated showcase C arranged on an interior A side (indicated by double-dot chain lines in FIG. 3). The cooling system shown in FIG. 4 has the expansion valve 52 b and the evaporator 52 c in a refrigerated showcase C arranged on the interior A side (indicated by double-dot chain lines in FIG. 4). Further, each of the cooling systems shown in FIG. 3 and FIG. 4 has the ammonia circuit 51 on an exterior B side.
  • However, each of the cooling systems shown in FIG. 3 and FIG. 4 has the piping 53 a within which a high-temperature high-pressure refrigerant flows or the piping 53 b within which a high-pressure refrigerant flows arranged in the state of being exposed on the interior A. The arrangement of the piping 53 a and the piping 53 b arranged in the state of being exposed on the interior A makes the cooling systems shown in FIG. 3 and FIG. 4 subject to the fear of allowing the refrigerant to leak out indoors.
  • Also, in each of the cooling systems shown in FIG. 3 and FIG. 4 may need long-extended piping 53 a or 53 b depending on the location of the refrigerated showcase C placed on the interior A side. Where the piping 53 a or 53 b is long, the required quantity of the refrigerant to be sealed in increases correspondingly. Therefore, in the cooling system shown in FIG. 3 and FIG. 4, if the high-pressure refrigerant leaks to the interior A, a large quantity of the refrigerant may leak out to the interior A.
  • SUMMARY OF THE INVENTION
  • An object of the present invention is to provide a safe cooling system which can prevent its refrigerant from leaking into the room (except the machinery room for the indoor unit of the thermal system).
  • In order to achieve the object stated above, the cooling system according to the invention is provided with a first freezing circuit which comprises a first compressor, a first condenser, a first expansion mechanism and a first heat exchanger and in which a first refrigerant is circulated; a second freezing circuit which comprises a second compressor, a second heat exchanger, a second expansion mechanism and an evaporator and in which a second refrigerant is circulated; and a heat medium circuit in which a heat medium for exchanging heat between the first refrigerant of the first heat exchanger and the second refrigerant of the second heat exchanger is circulated, wherein the first freezing circuit is arranged on the exterior side and the second freezing circuit is arranged in the machinery room of a thermal system on the interior side.
  • This cooling system has its first freezing circuit in which the high-pressure first refrigerant circulates installed on the exterior side. The cooling system has its second freezing circuit in which the high-pressure second refrigerant circulates installed in the machinery room of a thermal system arranged on the interior side. The arrangement of the first freezing circuit on the exterior side and of the second freezing circuit in the machinery room means the interior arrangement of no piping in which the high-pressure first refrigerant or the high-pressure second refrigerant flows (except the piping in the machinery room of the thermal system). This means enhanced safety because there is no fear of leaking of the high-pressure first refrigerant or the high-pressure second refrigerant into the room. Furthermore, this cooling system has a heat medium circuit intervening between the first freezing circuit and the second freezing circuit. This heat medium circuit enables heat to be exchanged between the first refrigerant of the first freezing circuit and the second refrigerant of the second freezing circuit. The intervening presence of the heat medium circuit makes it unnecessary to elongate the piping of the first freezing circuit or of the second freezing circuit even if the machinery room of the thermal system is installed rather far from the exterior side. Therefore, the required quantity of the first refrigerant or the second refrigerant can be minimized and accordingly the safety of operation can be enhanced.
  • The above-stated objects and other objects, features and advantages of the invention will become more apparent from the following description when taken in conjunction with the accompanying drawings.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 shows a schematic configuration of a cooling system of a first preferred embodiment of the present invention;
  • FIG. 2 shows a schematic configuration of a cooling system of a second preferred embodiment of the invention;
  • FIG. 3 shows a schematic configuration of a conventional cooling system; and
  • FIG. 4 shows a schematic configuration of another conventional cooling system.
  • DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • FIG. 1 shows a first preferred embodiment of the invention.
  • This cooling system comprises a first freezing circuit 10, a second freezing circuit 20 and a heat medium circuit 30.
  • The first freezing circuit 10 is provided with a first compressor 11, a first condenser 12, a first expansion valve 13, which is a first expansion mechanism, and a first heat exchanger 14. This first freezing circuit 10 circulates a first refrigerant in the sequence of the first compressor 11→the first condenser 12→the first expansion valve 13→the first heat exchanger 14→the first compressor 11. The first refrigerant used in the first freezing circuit 10 is a natural refrigerant (e.g., ammonia).
  • The second freezing circuit 20 is provided with a second compressor 21, a second heat exchanger 22, a second expansion valve 23, which is a second expansion mechanism, and an evaporator 24. This second freezing circuit 20 circulates a second refrigerant in the sequence of the second compressor 21→the second heat exchanger 22→the second expansion valve 23→the evaporator 24→the second compressor 21. The second refrigerant used in the second freezing circuit 20 is the natural refrigerant (e.g., carbon dioxide).
  • The heat medium circuit 30 is provided with the first heat exchanger 14, the second heat exchanger 22 and a circulating pump 31. The first heat exchanger 14 is shared by the first freezing circuit 10 and the heat medium circuit 30. The second heat exchanger 22 is shared by the second freezing circuit 20 and the heat medium circuit 30. The heat medium circuit 30 circulates a heat medium in the sequence of the first heat exchanger 14→the circulating pump 31→the second heat exchanger 22→the first heat exchanger 14. The heat medium used in this heat medium circuit 30 is brine (e.g., a calcium chloride solution) or water.
  • The cooling system configured as described has the first freezing circuit 10 and the first heat exchanger 14 installed on an exterior B side. Further, the cooling system has the second freezing circuit 20 and the second heat exchanger 22 installed in a machinery room of a refrigerated showcase C, which is a thermal system arranged on an interior A (indicated by double-dot chain lines in FIG. 1) side.
  • Next, the operation of the cooling system shown in FIG. 1 will be described.
  • The first refrigerant of the first freezing circuit 10 circulates in the sequence of the first compressor 11→the first condenser 12→the first expansion valve 13→the first heat exchanger 14→the first compressor 11 (see the broken arrow in FIG. 1). The second refrigerant of the second freezing circuit 20 circulates in the sequence of the second compressor 21→the second heat exchanger 22→the second expansion valve 23→the evaporator 24→the second compressor 21 (see the solid arrow in FIG. 1). Further, the heat medium of the heat medium circuit 30 circulates in the sequence of the first heat exchanger 14→the circulating pump 31→the second heat exchanger 22→the first heat exchanger 14 (see the bold arrow in FIG. 1). The circulation of the first refrigerant, the second refrigerant or the heat medium in the circuit 10, 20 or 30, respectively causes heat to be exchanged in the first heat exchanger 14 between the first refrigerant flowing in the first freezing circuit 10 and the heat medium flowing in the heat medium circuit 30 or, in the second heat exchanger 22, between the second refrigerant flowing in the second freezing circuit 20 and the heat medium flowing in the heat medium circuit 30. These heat exchanges cause the refrigerated showcase C arranged on the interior A side to be refrigerated by the cooled second refrigerant.
  • In the cooling system of this embodiment, the first freezing circuit 10 in which the high-pressure first refrigerant circulates is arranged outside the room, and the second freezing circuit 20 in which the high-pressure second refrigerant circulates is arranged inside the refrigerated showcase C. This arrangement prevents the piping in which the high-pressure first refrigerant or the second refrigerant flows from being placed on the interior A side (except the piping in the machinery room of the refrigerated showcase C). Therefore, the cooling system of this embodiment can be enhanced in safety because there is no fear of leaking of the high-pressure first refrigerant or second refrigerant into the room.
  • Further in the cooling system of this embodiment, the heat medium circuit 30 intervenes between the first freezing circuit 10 and the second freezing circuit 20. This makes it unnecessary to elongate the piping of the first freezing circuit 10 or of the second freezing circuit 20 even if the refrigerated showcase C is installed rather far from the exterior B. Therefore, the cooling system of this embodiment can serve to minimize the required quantity of the first refrigerant or the second refrigerant and accordingly to enhance the safety of operation.
  • FIG. 2 shows a second embodiment of the invention. The same constituent parts as those in the cooling system 1 shown in FIG. 1 are represented by respectively the sane reference numerals and their description will be dispensed with.
  • The cooling system shown in FIG. 2 differs from the cooling system shown in FIG. 1 in that a heat medium circuit 40 is a known thermo-siphon type circuit using natural convection.
  • The cooling system shown in FIG. 2 also differs from the cooling system shown in FIG. 1 in that a low-pressure working fluid is used as the heat medium for the heat medium circuit 40.
  • The heat medium circuit 40 comprises the first heat exchanger 14 and the second heat exchanger 22. Thus, the first heat exchanger 14 is shared by the first freezing circuit 10 and the heat medium circuit 40, and the second heat exchanger 22 is shared by the second freezing circuit 20 and the heat medium circuit 40. Further, since a thermo-siphon type circuit is used as the heat medium circuit 40, the heat medium circuit 40 circulates the low-pressure working fluid in the sequence of the first heat exchanger 14→the second heat exchanger 22→the first heat exchanger 14 by utilizing natural convection. The working fluid used in this heat medium circuit 30 is a low-pressure refrigerant (e.g., water or alcohol).
  • The cooling system configured as described above has the first freezing circuit 10 and the first heat exchanger 14 installed on the exterior B side. Further, the cooling system has the second freezing circuit 20 and the second heat exchanger 22 installed in the machinery room of the refrigerated showcase C, which is the thermal system arranged on the interior A (indicated by double-dot chain lines in FIG. 2) side.
  • Next, the operation of the cooling system shown in FIG. 2 will be described.
  • As the circulation of the first refrigerant in the first freezing circuit 10 and that of the second refrigerant in the second freezing circuit 20 are the same as in the first embodiment described above, their description will be dispensed with. The working fluid of the heat medium circuit 40 circulates in the sequence of the first heat exchanger 14→the second heat exchanger 22→the first heat exchanger 14 (see the bold arrow in FIG. 2). The circulation of the first refrigerant, the second refrigerant or the working fluid in the circuit 10, 20 or 40 respectively causes heat to be exchanged in the first heat exchanger 14 between the first refrigerant flowing in the first freezing circuit 10 and the low-pressure working fluid flowing in the heat medium circuit 40 and in the second heat exchanger 22 between the second refrigerant flowing in the second freezing circuit 20 and the low-pressure working fluid flowing in the heat medium circuit 40. These heat exchanges cause the refrigerated showcase C arranged on the interior A side to be refrigerated by the cooled second refrigerant.
  • In the cooling system of this embodiment, the working fluid flowing in the heat medium circuit 40 arranged on the interior A side is low in pressure. The low pressure of the working fluid means that the cooling system of this embodiment has no high-pressure piping on the interior A side, resulting in enhanced safety. The other effects and advantages of the cooling system shown in FIG. 2 are the same as those of the cooling system shown in FIG. 1.
  • In the first and second embodiments described above, the second freezing circuit 20 and the second heat exchanger 22 are arranged in the refrigerated showcase C, which is a machinery room, but this is not the only possible arrangement. For instance, the second freezing circuit 20 and the second heat exchanger 22 may as well be arranged within an air conditioning system, a freezer or a refrigerator, which is a thermal system.
  • The preferred embodiments described in this specification are only illustrative but not limiting. The scope of the invention is stated in the appended claims, and all the variations that can be covered by the meanings of those claims are included in the present invention.

Claims (5)

1. A cooling system comprising:
a first freezing circuit which comprises a first compressor, a first condenser, a first expansion mechanism and a first heat exchanger and in which a first refrigerant is circulated;
a second freezing circuit which comprises a second compressor, a second heat exchanger, a second expansion mechanism and an evaporator and in which a second refrigerant is circulated; and
a heat medium circuit in which a heat medium for exchanging heat between the first refrigerant of the first heat exchanger and the second refrigerant of the second heat exchanger is circulated, wherein:
the first freezing circuit is arranged on a exterior side and the second freezing circuit is arranged in a machinery room of a thermal system on a interior side.
2. The cooling system according to claim 1, wherein
the heat medium circuit is so configured that the heat medium is circulated between the first heat exchanger and the second heat exchanger with a pump.
3. The cooling system according to claim 1, wherein
the heat medium circuit is so configured that the heat medium is circulated between the first heat exchanger and the second heat exchanger with a thermo-siphon.
4. The cooling system according to claim 1, wherein
the first refrigerant is ammonia.
5. The cooling system according to claim 1, wherein
the second refrigerant is carbon dioxide.
US11/530,459 2005-09-09 2006-09-09 Cooling System Abandoned US20070056312A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2005262468A JP2007071519A (en) 2005-09-09 2005-09-09 Cooling system
JP2005-262468 2005-09-09

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JP (1) JP2007071519A (en)
CN (1) CN1928461A (en)

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WO2009062526A1 (en) * 2007-11-13 2009-05-22 Carrier Corporation Refrigerating system and method for refrigerating
US20090272128A1 (en) * 2008-05-02 2009-11-05 Kysor Industrial Corporation Cascade cooling system with intercycle cooling
US20110094246A1 (en) * 2007-09-18 2011-04-28 Carrier Corporation Methods and systems for controlling integrated air conditioning systems
US20110138849A1 (en) * 2008-08-26 2011-06-16 Hoshizaki Denki Kabushiki Kaisha Cooling Device
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US20120117996A1 (en) * 2010-11-17 2012-05-17 Hill Phoenix, Inc. Cascade refrigeration system with modular ammonia chiller units
US20120210736A1 (en) * 2011-02-17 2012-08-23 Rocky Research Cascade floating intermediate temperature heat pump system
US20140260404A1 (en) * 2011-09-30 2014-09-18 Carrier Corporation High efficiency refrigeration system
AU2010315264B2 (en) * 2009-11-03 2016-03-31 The Chemours Company Fc, Llc. Cascade refrigeration system with fluoroolefin refrigerant
WO2017060733A1 (en) * 2015-10-08 2017-04-13 Isentra Ltd Water-cooled carbon dioxide refrigeration system
US9657977B2 (en) 2010-11-17 2017-05-23 Hill Phoenix, Inc. Cascade refrigeration system with modular ammonia chiller units
US9664424B2 (en) 2010-11-17 2017-05-30 Hill Phoenix, Inc. Cascade refrigeration system with modular ammonia chiller units
US20170191711A1 (en) * 2016-01-05 2017-07-06 Carrier Corporation Two phase loop distributed hvac&r system
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US9909790B2 (en) * 2007-09-18 2018-03-06 Carrier Corporation Methods and systems for controlling integrated air conditioning systems
US20110094246A1 (en) * 2007-09-18 2011-04-28 Carrier Corporation Methods and systems for controlling integrated air conditioning systems
US8316654B2 (en) 2007-11-13 2012-11-27 Carrier Corporation Refrigerating system and method for refrigerating
WO2009062526A1 (en) * 2007-11-13 2009-05-22 Carrier Corporation Refrigerating system and method for refrigerating
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US20090272128A1 (en) * 2008-05-02 2009-11-05 Kysor Industrial Corporation Cascade cooling system with intercycle cooling
US20110138849A1 (en) * 2008-08-26 2011-06-16 Hoshizaki Denki Kabushiki Kaisha Cooling Device
AU2010315264B2 (en) * 2009-11-03 2016-03-31 The Chemours Company Fc, Llc. Cascade refrigeration system with fluoroolefin refrigerant
CN102135345A (en) * 2009-12-31 2011-07-27 Lg电子株式会社 Water circulation system associated with refrigerant cycle
US20120085107A1 (en) * 2010-03-12 2012-04-12 Titan, Inc. Heat transfer processes and equipment for industrial applications
US20120117996A1 (en) * 2010-11-17 2012-05-17 Hill Phoenix, Inc. Cascade refrigeration system with modular ammonia chiller units
US9657977B2 (en) 2010-11-17 2017-05-23 Hill Phoenix, Inc. Cascade refrigeration system with modular ammonia chiller units
US9541311B2 (en) * 2010-11-17 2017-01-10 Hill Phoenix, Inc. Cascade refrigeration system with modular ammonia chiller units
US9664424B2 (en) 2010-11-17 2017-05-30 Hill Phoenix, Inc. Cascade refrigeration system with modular ammonia chiller units
US9239174B2 (en) * 2011-02-17 2016-01-19 Rocky Research Cascade floating intermediate temperature heat pump system
US20120210736A1 (en) * 2011-02-17 2012-08-23 Rocky Research Cascade floating intermediate temperature heat pump system
US20140260404A1 (en) * 2011-09-30 2014-09-18 Carrier Corporation High efficiency refrigeration system
GB2543086B (en) * 2015-10-08 2018-05-02 Isentra Ltd Water-cooled carbon dioxide refrigeration system
WO2017060733A1 (en) * 2015-10-08 2017-04-13 Isentra Ltd Water-cooled carbon dioxide refrigeration system
US20170191711A1 (en) * 2016-01-05 2017-07-06 Carrier Corporation Two phase loop distributed hvac&r system
US10429101B2 (en) 2016-01-05 2019-10-01 Carrier Corporation Modular two phase loop distributed HVACandR system
US10429102B2 (en) * 2016-01-05 2019-10-01 Carrier Corporation Two phase loop distributed HVACandR system
EP3199456A1 (en) * 2016-02-01 2017-08-02 General Electric Company Aircraft thermal management system

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