EP4137755A1 - Fonctionnement amélioré d'un économiseur dans un refroidisseur - Google Patents

Fonctionnement amélioré d'un économiseur dans un refroidisseur Download PDF

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Publication number
EP4137755A1
EP4137755A1 EP22190720.7A EP22190720A EP4137755A1 EP 4137755 A1 EP4137755 A1 EP 4137755A1 EP 22190720 A EP22190720 A EP 22190720A EP 4137755 A1 EP4137755 A1 EP 4137755A1
Authority
EP
European Patent Office
Prior art keywords
flow path
economizer
heat exchanger
refrigerant
main flow
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.)
Withdrawn
Application number
EP22190720.7A
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German (de)
English (en)
Inventor
Biswajit Mitra
Hsihua Li
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.)
Carrier Corp
Original Assignee
Carrier Corp
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Filing date
Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Publication of EP4137755A1 publication Critical patent/EP4137755A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/02—Subcoolers
    • 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
    • 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
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
    • 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

Definitions

  • Exemplary embodiments of the present disclosure relate to refrigeration systems, and more particularly, to an economizer heat exchanger for use in a chilled refrigeration system.
  • vapor compression refrigerant heat transfer loop One of the most common technologies in use for residential and commercial refrigeration and air conditioning is the vapor compression refrigerant heat transfer loop.
  • These loops typically circulate a refrigerant having appropriate thermodynamic properties through a loop that comprises a compressor, a heat rejection heat exchanger (i.e., heat exchanger condenser), an expansion device and a heat absorption heat exchanger (i.e., heat exchanger evaporator).
  • Vapor compression refrigerant loops effectively provide cooling and refrigeration in a variety of settings, and in some situations can be run in reverse as a heat pump.
  • An economizer is a refrigerant-refrigerant heat exchanger having a main pass and an economizer pass. At a location upstream from the economizer, the refrigerant is separated and provided to the main pass and the economizer pass in parallel.
  • the refrigerant provided to the economizer may include refrigerant vapor bypass from the condenser, which would negatively impact the operation of the expansion device, and therefore the efficiency of the refrigeration system.
  • a refrigeration system includes a compressor, a heat rejecting heat exchanger, an expansion device, and a heat absorbing heat exchanger fluidly connected to form a closed loop through which a refrigerant is configured to circulate.
  • An economizer heat exchanger is located downstream from an outlet of the heat rejecting heat exchanger and upstream from the expansion device relative to a flow of the refrigerant.
  • the economizer heat exchanger has a main flow path and an economizer flow path formed therein. All liquid refrigerant provided at an outlet of the heat rejecting heat exchanger is provided to the main flow path.
  • a portion of the refrigerant may be provided to the main flow path and the economizer flow path in series.
  • the refrigeration system may further comprise a subcooler arranged directly downstream from and in fluid communication with the heat rejecting heat exchanger, wherein an outlet of the subcooler may be fluidly connected to an inlet of the main flow path.
  • All the liquid refrigerant provided at the outlet of the subcooler may be provided to the main flow path.
  • the expansion device and the economizer flow path may be arranged in parallel relative to an outlet of the main flow path.
  • the compressor may include a primary suction inlet and an economizer suction inlet, the heat absorbing heat exchanger being fluidly connected to the primary suction inlet, and the economizer flow path being fluidly connected to the economizer suction inlet.
  • the refrigeration system may further comprise an economizer expansion device arranged downstream from the outlet of the main flow path and directly upstream from the economizer flow path.
  • An inlet of the main flow path may be arranged at a first side of the economizer heat exchanger and an inlet of the economizer flow path may be arranged at a second, opposite side of the economizer heat exchanger.
  • a refrigeration system includes a compressor, a heat rejecting heat exchanger, an expansion device, and a heat absorbing heat exchanger fluidly connected to form a closed loop through which a refrigerant is configured to circulate.
  • An economizer heat exchanger is located downstream from an outlet of the heat rejecting heat exchanger and upstream from the expansion device relative to a flow of the refrigerant.
  • the economizer heat exchanger has a main flow path and an economizer flow path formed therein.
  • An inlet of the economizer flow path is fluidly coupled to an outlet of the main flow path such that a portion of the refrigerant is provided to the main flow path and the economizer flow path in series.
  • All liquid refrigerant output from the heat rejecting heat exchanger may be provided to the main flow path.
  • the expansion device and the economizer flow path may be arranged in parallel relative to the outlet of the main flow path.
  • the compressor may include a primary suction inlet and an economizer suction inlet, the heat absorbing heat exchanger being fluidly connected to the primary suction inlet, and the economizer flow path being fluidly connected to the economizer suction inlet.
  • the refrigeration system may comprise an economizer expansion device arranged downstream from the outlet of the main flow path and directly upstream from the economizer flow path.
  • the refrigeration system may comprise a subcooler arranged directly downstream from and in fluid communication with the heat rejecting heat exchanger, wherein an outlet of the subcooler may be fluidly connected to an inlet of the main flow path.
  • All of the liquid refrigerant provided at the outlet of the subcooler may be provided to the main flow path.
  • An inlet of the main flow path may be arranged at a first side of the economizer heat exchanger and the inlet of the economizer flow path may be arranged at a second, opposite side of the economizer heat exchanger.
  • a method of operating a refrigeration system includes condensing and cooling a refrigerant, further cooling the refrigerant within a main flow path of an economizer heat exchanger, separating the refrigerant at an outlet of the main flow path into a first portion and a second portion, and heating the second portion of the refrigerant provided within an economizer flow path of the economizer heat exchanger.
  • the condensing and cooling may occur within a subcooler and all liquid refrigerant at the outlet of the subcooler may be provided to the main flow path.
  • the method may further comprise lowering an enthalpy of the second portion of the refrigerant, wherein lowering the enthalpy may occur prior to heating the second portion of the refrigerant within the economizer flow path.
  • the method may further comprise providing the first portion of the refrigerant at the outlet of the main flow path to an expansion device and a heat absorbing heat exchanger in series.
  • Fig. 1 (the Figure) is a schematic diagram of an exemplary refrigeration system.
  • the refrigeration system 20 includes a compressor 22, a heat rejecting heat exchanger 24, an economizer heat exchanger 26, an expansion device 28, and a heat absorbing heat exchanger 30 arranged in fluid communication to form a closed loop circuit.
  • the schematics and configuration shown are merely an example of a refrigeration system and are not intended to be limiting.
  • refrigeration systems may include controllers, receivers, filters, dryers, additional valves, heat exchangers, sensors, indicators, etc. without departing from the scope of the present disclosure.
  • high temperature, high pressure refrigerant vapor R is configured to exit from a discharge port 32 of the compressor 22 and is provided to the heat rejecting heat exchanger (i.e., a condenser or a gas cooler).
  • the heat rejecting heat exchanger 24 is a shell and tube heat exchanger.
  • a secondary fluid such as water for example, is configured to flow through the interior of the tubes and the refrigerant may be configured to flow over the outside of the tubes, through the shell.
  • all of the refrigerant output from the heat rejecting heat exchanger 24 is configured to flow to a subcooler 34, which increases the refrigerant subcooling.
  • the subcooler 34 may be positioned adjacent to or integrally formed with the heat rejection heat exchanger such that within the subcooler 34, the water flowing through the tubes therein is configured to further cool the refrigerant flowing around the tubes.
  • the fluid used to cool the refrigerant within the subcooler 34 is distinct from the fluid used to cool the refrigerant within the heat rejecting heat exchanger 24 are also contemplated herein.
  • embodiments where the subcooler 34 is a separate from the heat rejection heat exchanger 24 are also within the scope of the disclosure.
  • the configuration of the subcooler 34 may be different than the configuration of the heat rejection heat exchanger 24.
  • other suitable types of configurations of the subcooler include a refrigerant to air heat exchanger.
  • the economizer heat exchanger 26 Located downstream from the subcooler 34 is the economizer heat exchanger 26. Although the economizer heat exchanger is illustrated as being located directly downstream from the outlet of the subcooler 34, it should be understood that embodiments where one or more other components of the refrigeration system are located between the subcooler 34 and the economizer heat exchanger 26 are also contemplated herein. In an embodiment, the economizer heat exchanger 26 is a brazed plated fin heat exchanger. However, other suitable types of heat exchangers are also within the scope of the disclosure. Further, the economizer heat exchanger 26 is a refrigerant-refrigerant heat exchanger and therefore has a plurality of distinct fluid flow paths formed therein. In the illustrated, non-limiting embodiment, the economizer heat exchanger 26 has a first flow path and a second flow path, represented at 36 and 38, respectively.
  • the outlet of the subcooler 34 is fluidly coupled to an inlet of the first flow path 36, also referred to herein as the "main flow path", of the economizer heat exchanger 26.
  • the main flow path also referred to herein as the "main flow path" of the economizer heat exchanger 26.
  • any remaining refrigerant vapor within the subcooler 34 may be returned to the compressor 22, the substantially entire flow of liquid refrigerant provided at the outlet of the subcooler 34 is delivered to the main flow path 36 of the economizer heat exchanger 26.
  • the main flow path 36 is illustrated as a single pass through the economizer heat exchanger 26, it should be understood that in other embodiment the main flow path 36 may include a plurality of passes through the economizer heat exchanger 26.
  • the flow of refrigerant is divided into a first portion R1 and a second portion R2 configured to flow in parallel to separate components of the refrigeration system.
  • the first portion R1 of the refrigerant provided at the outlet of the main flow path 36 of the economizer heat exchanger 26 is configured to flow to the expansion device 28.
  • the heat absorption heat exchanger i.e., an evaporator 30.
  • the heat absorption heat exchanger is a shell and tube heat exchanger.
  • a secondary fluid such as water for example, is configured to flow through the interior of the tubes and the refrigerant may be configured to flow over the outside of the tubes, through the shell.
  • the resulting cooled water may then be used to condition an air flow to be delivered to an area of a building or another location to be conditioned by the refrigeration system.
  • the heat absorbing heat exchanger 30 is a refrigerant to air heat exchanger such that the heat absorbing heat exchanger 30 directly conditions the air flow to be provided to an area to be conditioned are also within the scope of the disclosure.
  • the first portion R1 of refrigerant output from the heat absorbing heat exchanger 30 is provided via a first compressor inlet path to a primary suction inlet 40 of the compressor 22. Accordingly, the fluid loop of the first portion R1 of the refrigerant includes the compressor 22, heat rejecting heat exchanger 24, subcooler 34, main flow path 36 of the economizer heat exchanger 26, expansion device 28, and heat absorbing heat exchanger 30.
  • An economizer expansion device 42 is arranged downstream from the outlet of the main flow path 36 of the economizer heat exchanger 26, and upstream from the second flow path 38, also referred to herein as the "economizer flow path" of the economizer heat exchanger 26. Accordingly, the second portion R2 of the refrigerant is provided to the economizer expansion device 42 which serves to expand and cool the second portion R2 of refrigerant. From the economizer expansion device 42, the second portion of the refrigerant is provided to an inlet of the economizer flow path 38 of the economizer heat exchanger 26. Accordingly, the second portion R2 of the refrigerant is configured to flow through the main flow path 36 and the economizer flow path 38 of the economizer heat exchanger 26 in series.
  • the inlet of the main flow path 36 and the inlet of the economizer flow path 38 are arranged at opposite sides or ends of the economizer heat exchanger 26.
  • the inlets of both flow paths could be arranged at the same side of the economizer heat exchanger 26 or at adjacent sides of the economizer heat exchanger 26.
  • the outlets of both the main flow path 36 and the inlet of the economizer flow path 38 may be arranged at opposite sides, the same side, or adjacent sides depending on the desired flow configuration of the economizer heat exchanger 26.
  • the economizer flow path 38 is illustrated as a single pass, it should be understood that in some embodiments, the economizer flow path 38 may include a plurality of passes through the economizer heat exchanger 26.
  • the second portion R2 of the refrigerant is configured to absorb heat from the refrigerant R within the main flow path 36, thereby cooling the refrigerant R within the main flow path 36. As a result of this heat transfer, the second portion R2 of the refrigerant within the economizer flow path 38 may become a vapor. From the outlet of the economizer flow path 38, the second portion of the refrigerant is provided to an economizer suction inlet 44 located at an in intermediate portion of the compressor 22. Accordingly, the second portion R2 of the refrigerant bypasses the expansion device 28 and the heat absorbing heat exchanger 30 of the refrigeration system 20.
  • the fluid loop of the second portion R2 of the refrigerant includes the compressor 22, heat rejecting heat exchanger 24, subcooler 34, main flow path 36 of the economizer heat exchanger 26, economizer expansion device 42, and economizer flow path 3 8 of the economizer heat exchanger 26.
  • the piping configuration of the refrigeration system 20 is simplified. Further, such a configuration ensures that the second portion R2 of the refrigerant provided to the economizer flow path 38 has a lower enthalpy and amount of vapor therein, thereby enhancing operation of the economizer heat exchanger 26 and the refrigeration system 20.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP22190720.7A 2021-08-21 2022-08-17 Fonctionnement amélioré d'un économiseur dans un refroidisseur Withdrawn EP4137755A1 (fr)

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US202163235715P 2021-08-21 2021-08-21

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EP4137755A1 true EP4137755A1 (fr) 2023-02-22

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EP22190720.7A Withdrawn EP4137755A1 (fr) 2021-08-21 2022-08-17 Fonctionnement amélioré d'un économiseur dans un refroidisseur

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US (1) US20230053834A1 (fr)
EP (1) EP4137755A1 (fr)
CN (1) CN115711497A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4008980A1 (fr) * 2020-12-04 2022-06-08 Carrier Corporation Procédé de refroidissement d'un réfrigérant, système associé et condenseur associé

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007111586A1 (fr) * 2006-03-27 2007-10-04 Carrier Corporation système réfrigérant avec circuits Économiseurs étagés parallèles employant une compression multi-étage
US20090113900A1 (en) * 2005-06-08 2009-05-07 Carrier Corporation Methods and apparatus for operating air conditioning systems with an economizer cycle

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007155229A (ja) * 2005-12-06 2007-06-21 Sanden Corp 蒸気圧縮式冷凍サイクル
EP2005079B1 (fr) * 2006-03-27 2016-12-07 Carrier Corporation Système de réfrigération avec circuits d'économiseur étagés en parallèle et compresseur principal à un ou deux étages
CN101568769A (zh) * 2006-12-26 2009-10-28 开利公司 具有经济器、中间冷却器和多级压缩机的制冷剂系统
US20090025405A1 (en) * 2007-07-27 2009-01-29 Johnson Controls Technology Company Economized Vapor Compression Circuit
JP4947197B2 (ja) * 2010-07-15 2012-06-06 ダイキン工業株式会社 ヒートポンプシステム
JP5579243B2 (ja) * 2012-10-26 2014-08-27 三菱電機株式会社 冷凍サイクル装置
EP3910263B1 (fr) * 2019-01-07 2023-09-06 Mitsubishi Electric Corporation Dispositif à cycle de réfrigération

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090113900A1 (en) * 2005-06-08 2009-05-07 Carrier Corporation Methods and apparatus for operating air conditioning systems with an economizer cycle
WO2007111586A1 (fr) * 2006-03-27 2007-10-04 Carrier Corporation système réfrigérant avec circuits Économiseurs étagés parallèles employant une compression multi-étage

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CN115711497A (zh) 2023-02-24
US20230053834A1 (en) 2023-02-23

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