EP3175184B1 - Appareil de réfrigération comportant un circuit de dégivrage d'évaporateur de compartiment congélation - Google Patents

Appareil de réfrigération comportant un circuit de dégivrage d'évaporateur de compartiment congélation Download PDF

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Publication number
EP3175184B1
EP3175184B1 EP14747609.7A EP14747609A EP3175184B1 EP 3175184 B1 EP3175184 B1 EP 3175184B1 EP 14747609 A EP14747609 A EP 14747609A EP 3175184 B1 EP3175184 B1 EP 3175184B1
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EP
European Patent Office
Prior art keywords
coil
refrigerant
freezing
compressor
circuit
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Active
Application number
EP14747609.7A
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German (de)
English (en)
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EP3175184A1 (fr
Inventor
Tugba SARICAY
Turgay Ercan
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Arcelik AS
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Arcelik AS
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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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
    • 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
    • F25B2400/0403—Refrigeration circuit bypassing means for the condenser
    • 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
    • F25B2400/0411—Refrigeration circuit bypassing means for the expansion valve or capillary tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2511—Evaporator distribution valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel

Definitions

  • the present invention relates to a refrigeration appliance provided with an improved defrost mechanism.
  • a closed refrigerant circuit having a compressible refrigerant which flows through a compressor, a condenser, a refrigerant expansion element and an evaporator.
  • a refrigerant compressed in the compressor is typically condensed into a liquid by the condenser, and then evaporated in the evaporator.
  • the condenser effects transfer of thermal energy from the compressed refrigerant to the ambient air and the evaporator transfers thermal energy from the ambient air in the refrigeration compartment to the compressed refrigerant.
  • the compressed refrigerant in the refrigerant circuit is in superheated vapor phase while leaving the compressor. It transforms into the liquid-vapor state in the condenser and then into the liquid state enroute to the refrigerant expansion element.
  • the refrigerant changes to liquid-vapor phase in the refrigerant expansion element while the pressure thereof is being reduced.
  • refrigeration appliances are usually equipped with a system for automatically defrosting the cooling coil at specified intervals so that the ice accumulated on the cooling coil surface is melted and the resultant water is drained away.
  • a system may provide that feeding of the compressed refrigerant to the evaporator is temporarily interrupted and a hot refrigerant is directed to the evaporator to defrost the ice collected on the surfaces thereof. The flow of hot refrigerant to the cooling coil is subsequently stopped and the circulation of compressed refrigerant is continued.
  • a defrost heater can alternatively be employed to thaw or defrost the ice formed.
  • such a unit not only requires electric power expenditure but also causes reduced efficiency due to temperature fluctuations.
  • EP1334321 discloses a defrosting method for a refrigeration appliance having multiple refrigeration compartments, specifically a fresh food compartment and a freezer compartment, which comprises a fresh food evaporator for cooling the fresh food compartment and a freezer evaporator for cooling the freezer compartment.
  • the fresh food evaporator is composed of two separate evaporators namely a first sub-evaporator and a second sub-evaporator. Sub-evaporators are arranged in parallel and both of the sub-evaporators are used sequentially for cooling the fresh-food compartment. This enables continuous cooling of the fresh food compartment and defrosting of the fresh food evaporator concurrently.
  • EP 2 677 252 A1 discloses a similar refrigeration appliance with two evaporators and switching valves to control the refrigerant flow.
  • the present invention is devised under the recognition that an improved defrost system specifically dedicated to a freezer evaporator and effecting the defrost operation thereof in a substantially accelerated manner remains a need.
  • the present invention provides a refrigeration appliance having a freezer evaporator defrost system by which the ice formed on the freezer cooling coil surface of the appliance can be efficiently and rapidly thawed.
  • the present invention therefore provides a refrigeration appliance having a freezer cooling coil defrost system as provided by the characterizing features defined in Claim 1.
  • Primary object of the present invention is to provide an improved freezer cooling coil defrost system in a refrigeration appliance.
  • the present invention proposes a refrigeration appliance having one fresh food compartment along with a freezer compartment.
  • a compressor, a condenser coil, a cooling coil in association with said fresh food compartment and a freezing coil in association with said freezer compartment are provided.
  • a switching valve is provided to be located directly before the freezing coil such that it allows selective fluid communication to the freezing coil from a cooling, defrost or freezing circuit lines.
  • the switching valve is both in connection with the cooling coil and a refrigerant expansion element in separate lines. It is in direct communication with the compressor to transfer a hot refrigerant directly to the freezing coil through the defrost circuit line.
  • the switching valve while completing the freezing circuit from the condenser, through the refrigerant expansion element and the freezing coil to the compressor, also provides a return line for the refrigerant flowing through the cooling coil.
  • the present invention relates to a refrigeration appliance with a fresh food refrigeration compartment and a freezer compartment, said appliance further having a compressor (2) compressing a refrigerant to a high temperature and a high pressure, the compressor (2) typically having a suction inlet and a high pressure outlet.
  • a condenser coil (3) in connection with the high-pressure outlet of the compressor (2) is provided to condensate the refrigerant into a liquid.
  • Fig. 1 demonstrates a conventional refrigeration and defrost circuit having operably connected thereto in serial order a compressor (2), a condenser coil (3), a freezing coil (8), i.e. the freezing evaporator and a cooling coil (5), i.e. the fresh food evaporator.
  • a defrosting system in the form of a defrost heater (13) typically provides defrosting of the freezing coil (8) at specified intervals in an automated manner so that the ice accumulated on the surfaces of the freezing coil (8) is melted, the ice formed is thawed.
  • the freezing coil (8) evaporating the refrigerant has an inlet connected to a first refrigerant expansion element (6) and an outlet connected to the cooling coil (5).
  • the cooling and freezing coils (5, 8) may typically have a refrigerant flowing pipe and a multitude of plate-shaped fins extending in parallel in an equidistant manner.
  • Fig. 2 demonstrates another refrigeration and defrost circuit having operably connected thereto in serial order a compressor (2), a condenser coil (3), a cooling coil (5) and a freezing coil (8).
  • a switching valve (4) connects the outlet of the condenser coil (3) selectively to a first refrigerant expansion element (6) or to a second refrigerant expansion element (7). Said switching valve (4) therefore controls the flowing direction of the refrigerant through a cooling circuit line (9) or a freezing circuit line (11).
  • the compressor (2) circulates a compressible refrigerant to the condenser coil (3) in which the refrigerant is condensed into liquid due to transfer of thermal energy from the compressed refrigerant to the ambient air.
  • the cooling circuit line (9) the refrigerant flows through the first refrigerant expansion element (6) typically in the form of a capillary tube, changing to liquid-vapor phase while its pressure is reduced.
  • the refrigerant is then evaporated in the cooling coil (5) due to heat exchange with the air in the fresh food compartment and returns to the compressor (2) through a compressor return line (12) passing through the freezing coil (8).
  • the compressor (2) circulates the compressible refrigerant to the condenser coil (3), flowing through the freezing circuit line (11) and through the second refrigerant expansion element (7) to the freezer coil (8).
  • the compressor (2) may circulate hot refrigerant to the freezing coil (8) through a defrost circuit line (10) such that the freezing coil (8) is defrosted.
  • an improved defrost system such that the defrost operation of the freezer coil (8) is effected in a substantially accelerated manner.
  • a switching valve (4) is situated right before the freezing coil (8) and in connection with the cooling coil (5) and the second refrigerant expansion element (7) in separate lines.
  • the switching valve (4) being in direct communication with the compressor (2) can transfer the hot refrigerant directly to the freezing coil (8) through a defrost circuit line (10).
  • the switching valve's (4) outlets serve as inlets in the manner that three outlets thereof fluidly communicate with the cooling, defrost and freezing circuit lines (9, 10, 11). Therefore, the structural configuration of the defrost circuit line (10) in accordance with the present invention is advantageous in that the hot gas is not circulated to the condenser coil (3) first, since the compressor (2) directly communicates with the freezing coil (8) by means of the switching valve (4).
  • the switching valve (4) can communicate with the second refrigerant expansion element (7) and the cooling coil (5) in separate lines so as to complete the freezing circuit line (11) for the freezing coil (8) and to simultaneously form a return line (12) for the refrigerant flowing through the cooling coil (5).
  • the switching valve (4) is an electrically operated valve realized in the form of a solenoid valve. These units are solenoid valves having selectively opening outlets to the cooling, defrost or freezing circuit lines (9, 10 and 11) in accordance with the operation mode of the refrigeration and defrost circuit (1). More specifically, the switching valve (4) selectively allows refrigerant flow in the cooling circuit line (9), the defrost circuit line (10) or the freezing circuit line (11).
  • the present invention proposes a refrigeration appliance having at least one fresh food refrigeration compartment and at least one freezer compartment, the refrigeration appliance having a refrigeration and defrost circuit (1) comprising a compressor (2) for compressing a refrigerant to a high temperature and a high pressure, a condenser coil (3) in connection with the compressor (2) and in which the refrigerant is condensable into liquid, a cooling coil (5) in connection with the condenser coil (3) through a first refrigerant expansion element (6) and a freezing coil (8) in connection with the condenser coil (3) through a second refrigerant expansion element (7).
  • a refrigeration and defrost circuit (1) comprising a compressor (2) for compressing a refrigerant to a high temperature and a high pressure, a condenser coil (3) in connection with the compressor (2) and in which the refrigerant is condensable into liquid, a cooling coil (5) in connection with the condenser coil (3) through a first refrigerant expansion element (6) and a freezing coil
  • a switching valve (4) is situated directly before the freezing coil (8) and in connection with the cooling coil (5) and the second refrigerant expansion element (7) in separate lines.
  • the switching valve (4) is in direct communication with the compressor (2) to transfer a hot refrigerant directly to the freezing coil (8) through a defrost circuit line (10).
  • the switching valve (4) fluidly communicates with the cooling coil (5) in a cooling circuit line (9) and with the second refrigerant expansion element (7) in a freezing circuit line (11).
  • the switching valve (4) completes the freezing circuit line (11) for the freezing coil (8) and simultaneously forms a return line (12) for the refrigerant flowing through the cooling coil (5).
  • the present invention therefore affords a refrigeration and defrost circuit (1) by which the ice accumulation problem is addressed so as to efficiently thaw the ice formed on the freezing coil (8) surface in an accelerated manner. More specifically, the present invention ensures that the compressor (2) directly communicates with the freezing coil (8) by means of the switching valve (4), the latter being in fluid communication with the second refrigerant expansion element (7) and the cooling coil (5) in separate lines so as to complete the freezing circuit line (11) for the freezing coil (8) and simultaneously form the return line (12) for the refrigerant flowing through the cooling coil (5).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Defrosting Systems (AREA)

Claims (1)

  1. Appareil de réfrigération comportant au moins un compartiment de réfrigération pour aliments frais et au moins un compartiment congélateur, l'appareil de réfrigération comportant un circuit de réfrigération et de dégivrage (1) comprenant un compresseur (2) pour comprimer un réfrigérant à haute température et à haute pression, un serpentin de condenseur (3) en liaison avec le compresseur (2) et dans lequel le réfrigérant est condensable en liquide, un serpentin de refroidissement (5) associé audit au moins un compartiment pour aliments frais et en liaison avec le serpentin de condenseur (3) à travers un premier élément d'expansion de réfrigérant (6) et un serpentin de congélation (8) associé audit au moins un compartiment de congélation et en liaison avec ledit serpentin de condenseur (3) par l'intermédiaire d'un second élément d'expansion de réfrigérant (7), dans lequel il est prévu une vanne de commutation (4) est située directement devant le serpentin de congélation (8) et en relation avec le serpentin de refroidissement (5) et le second élément d'expansion de réfrigérant (7) dans des conduites séparées,
    dans lequel la vanne de commutation (4) est en communication directe avec le compresseur (2) pour transférer un réfrigérant chaud directement au serpentin de congélation (8) à travers une ligne de circuit de dégivrage (10) en ce que le réfrigérant chaud ne circule pas dans le condenseur (3) d'abord,
    dans lequel la vanne de commutation (4) communique de manière fluide avec le serpentin de refroidissement (5) dans une ligne de circuit de refroidissement (9) et avec le second élément d'expansion de réfrigérant (7) dans une ligne de circuit de congélation (11),
    l'appareil de réfrigération étant caractérisé
    en ce que la vanne de commutation (4) complète la conduite de circuit de congélation (11) pour le serpentin de congélation (8) et forme simultanément une conduite de retour (12) pour le réfrigérant circulant dans le serpentin de refroidissement (5),
    la vanne de commutation (4) permettant au réfrigérant de s'écouler sélectivement dans la ligne de circuit de refroidissement (9), la ligne de circuit de dégivrage (10) ou la ligne de circuit de congélation (11) comme suit:
    dans lequel dans un circuit de dégivrage, le réfrigérant suit un circuit: le compresseur (2) - la ligne de circuit de dégivrage (10) - la vanne de commutation (4) - le serpentin de congélation (8) - le compresseur (2),
    dans lequel dans un circuit de refroidissement le réfrigérant suit le circuit: le compresseur (2) - le serpentin du condenseur (3) - le premier élément d'expansion du réfrigérant (6) - la ligne du circuit de refroidissement (9) - le serpentin de refroidissement (5) - le retour ligne (12) - la vanne de commutation (4) - le serpentin de congélation (8) - le compresseur (2), et
    dans un circuit de congélation, le réfrigérant suit le circuit: le compresseur (2) - le serpentin du condenseur (3) - la ligne du circuit de congélation (11) - le deuxième élément d'expansion du réfrigérant (7) - la vanne de commutation (4) - le serpentin (8) - le compresseur (2).
EP14747609.7A 2014-07-31 2014-07-31 Appareil de réfrigération comportant un circuit de dégivrage d'évaporateur de compartiment congélation Active EP3175184B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/066477 WO2016015768A1 (fr) 2014-07-31 2014-07-31 Appareil de réfrigération comportant un circuit de dégivrage d'évaporateur de compartiment congélation

Publications (2)

Publication Number Publication Date
EP3175184A1 EP3175184A1 (fr) 2017-06-07
EP3175184B1 true EP3175184B1 (fr) 2018-03-21

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EP14747609.7A Active EP3175184B1 (fr) 2014-07-31 2014-07-31 Appareil de réfrigération comportant un circuit de dégivrage d'évaporateur de compartiment congélation

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EP (1) EP3175184B1 (fr)
TR (1) TR201808809T4 (fr)
WO (1) WO2016015768A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102480701B1 (ko) * 2015-07-28 2022-12-23 엘지전자 주식회사 냉장고

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04356677A (ja) * 1991-05-29 1992-12-10 Sharp Corp 蓄冷式冷蔵庫
KR0182726B1 (ko) * 1996-03-28 1999-05-01 윤종용 독립냉각방식 냉장고의 제상장치
KR101366279B1 (ko) * 2007-11-05 2014-02-20 엘지전자 주식회사 냉장고 및 그 제어방법
KR101962129B1 (ko) * 2012-06-22 2019-07-17 엘지전자 주식회사 냉장고

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EP3175184A1 (fr) 2017-06-07
WO2016015768A1 (fr) 2016-02-04
TR201808809T4 (tr) 2018-07-23

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