EP2938943B1 - Cooling device with combined heater for dew and frost prevention - Google Patents

Cooling device with combined heater for dew and frost prevention Download PDF

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Publication number
EP2938943B1
EP2938943B1 EP12813056.4A EP12813056A EP2938943B1 EP 2938943 B1 EP2938943 B1 EP 2938943B1 EP 12813056 A EP12813056 A EP 12813056A EP 2938943 B1 EP2938943 B1 EP 2938943B1
Authority
EP
European Patent Office
Prior art keywords
rear wall
heater
evaporator
cooling device
storage compartment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12813056.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2938943A1 (en
Inventor
Yasin AKSIN
Yigit OZSACMACI
Turgay Ercan
Gokhan Ozseker
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.)
Arcelik AS
Original Assignee
Arcelik AS
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
Application filed by Arcelik AS filed Critical Arcelik AS
Priority to PL12813056T priority Critical patent/PL2938943T3/pl
Publication of EP2938943A1 publication Critical patent/EP2938943A1/en
Application granted granted Critical
Publication of EP2938943B1 publication Critical patent/EP2938943B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • 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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/02—Detecting the presence of frost or condensate
    • 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
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • 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
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/16—Convertible refrigerators

Definitions

  • the present invention relates to a cooling device comprising a storage compartment capable of operating either as a deep-freezer or as a fresh food refrigerator, such as the cooling device disclosed in EP0181781 (A ).
  • the invention comprises a combined heater and eliminates the need for using, a usually metal, heat shield for protecting the usually plastic rear wall of the storage volume of the cooling device from reverse heat flow from the evaporator, thus reducing the number of assembly parts and the material costs, eventually resulting in facilitation of the manufacturing process.
  • Cooling devices allowing optional use for refrigeration of perishable materials e.g. as a fresh food refrigerator or alternatively, as a deep-freeze, utilize an evaporator which is usually located between the rear wall of the storage compartment and the outer housing of the device.
  • the evaporator serves for reducing the temperature of circulating air within the cooling device.
  • the surface temperature of the evaporator may go as low as -27 deg. Celcius, which is way below the freezing temperature of water, eventually causing frost of the humidity contained in the circulating air. Nonetheless, the adjacent surface of the rear wall of storage compartment to the evaporator usually has a temperature between 2-10 deg. Celcius, when operated in fresh food preserving mode of the device. This temperature difference may cause dew formation on the inner surface of rear wall of the storage compartment adjacent to the evaporator.
  • a dew prevention device namely an evaporator shield heater for continuous operation when the device is in fresh food refrigeration mode, is placed beneath a metal heat shield which protects the generally plastic rear wall, eventually preventing it from chronic contact with dew or water in liquid form.
  • a usually metal heat shield is placed between the rear wall of the storage compartment and the evaporator, said shield also preventing sharp evaporator fins from damaging the back surface of the rear wall of the storage compartment.
  • a second heater specifically a defrost heater is utilized for discrete operation in order to melt constantly accumulating frost on the cold evaporator surface.
  • Assembly of such a system requires montage of a defrost heater neighboring to the evaporator, including a metal heat shield between the rear wall of the storage compartment and the evaporator for protecting said rear wall from sharp evaporator fins, and an evaporator shield heater on the back surface of said metal heat shield.
  • dew prevention is intended by heating the door periphery.
  • This design does not relate to the problem of dew deposition on the coldest surface points i.e. surfaces adjacent to the evaporator, where the dew deposition is most intense inside the refrigeration volume.
  • JP2006220358 (A ), a heating unit is located right on the backside of the rear wall of the storage compartment of a refrigerator, which was intended for cold air humidity deposition, in order to provide dew-and frost prevention around its vicinity.
  • one of the objects of the present invention is to provide a dew and frost prevention system for cooling devices having both refrigeration and freezer modes, said system having a simplified structure with reduced parts and facilitated assembly and providing a cooling device equipped with a system as such.
  • a cooling device capable of operating either as a deep-freezer or as a fresh food refrigerator.
  • the device comprises a storage compartment and an evaporator located outside of said storage compartment.
  • the storage compartment has a rear wall to which the evaporator is attached.
  • the cooling device further comprises a combined heater having a defrost heater placed in thermal communication with said evaporator, and a heater placed in between said evaporator and the rear wall of the storage compartment such that said rear wall heater remains in thermal communication with both the evaporator and the rear wall of said storage compartment.
  • the rear wall heater cushions in between said evaporator and said rear wall.
  • the cooling device further comprises a controller which is configured to energize the heater of the rear wall of the storage compartment when the device is in fresh food refrigerator mode.
  • the rear wall heater in use, prevents dew formation on the rear surfaces of the storage compartment of the cooling device.
  • the controller may be configured to energize both the rear wall heater and the defrost heater when the device is in defrost cycle.
  • a defrost cycle is an operational mode during which frost formed on the evaporator is thaw out.
  • a frost sensor may be located around the evaporator for facilitating detection of frost formation and commencing a subsequent defrost cycle.
  • the defrost heater according to the present invention is suitably located on a plane parallel to the plane of the rear wall heater.
  • the cooling device may further comprise a thermal insulation sheet between the evaporator and the rear wall heater. The purpose of the thermal insulation sheet is to reduce the heat flow from inside the storage room of the cooling device towards the evaporator so that dew formation in the storage room of the cooling device is reduced.
  • the inner assembly of a cooling device comprises an evaporator (4) which is placed behind the rear wall (1) of the storage compartment of the device and which serves for cooling the air circulated by a fan (8).
  • the device further comprises a rear wall heater (5a) for preventing dew formation and potential liquid water deposition on the inside of the storage volume of cooling device; a defrost heater (5b) for removing the deposited ice on the cold evaporator surface caused by frozen water content of the circulated air, and a controller which is not shown in the figures.
  • Cooling devices allowing optional use as a fresh food refrigerator or as a deep freezer, usually utilize an evaporator (4) which is located outside of the storage volume of the device.
  • a dew prevention device namely an evaporator shield heater (2) operated during fresh food refrigeration mode, is placed behind and/or beneath an evaporator shield (3) for protecting the generally plastic rear wall (1) from being subject to chronic contact with water which forms due to the vast temperature difference of the evaporator (4) and the refrigeration compartment surfaces.
  • an evaporator shield (3) is placed in between the rear wall (1) of the storage compartment and the evaporator (4), said shield further preventing the possibility of sharp evaporator fins from damaging the back surfaces of the rear wall (1) of the storage compartment.
  • the controller is configured to energize, as necessary to prevent dew formation, the rear wall heater (5a) when the device is in fresh food refrigerator mode.
  • said controller may energize both the rear wall heater (5a) and the defrost heater (5b) in order to shorten the duration of the defrost cycle.
  • the rear wall heater (5a) in this latter case may help to melt down the frost accumulated on the evaporator. It must be kept in mind that the rear wall heater (5a) is placed in thermal communication with the evaporator and heat produced by the rear wall heater (5a) can easily be conveyed, through the metal body of the evaporator, to the opposite side of the evaporator (4) in order to help the frost heater (5b) melt accumulated frost.
  • the rear wall heater (5a) cushions in between the rear wall (1) of the storage compartment of the cooling device and the evaporator (4) and this physical contact helps the heat produced by the rear wall heater (5a) be swiftly transferred through the body of the heater, which has very good heat transfer properties.
  • the present invention solves the problem of frost and dew prevention with a simplified design having a facilitated assembly.
  • the present invention proposes an easy to install combined heater (5a, 5b) installed directly on the evaporator (4), in which one part, namely rear wall heater (5a) is used to heat the rear wall (1) on its back surface, whereas the second part, namely defrost heater (5b).
  • Both heaters (5a,5b) are operable by a controller based on the operating mode of the device and settings of the user and operational conditions.
  • Fig. 1 shows a sectional side view of the cooling device according to the present invention. Components like the compressor are removed for simplicity. Having removed the front door (7), the inner volume of the cooling device of Fig. 1 is depicted in Fig. 2 . The rear wall (1) of the storage compartment of the cooling device is depicted in Fig. 3 .
  • Fig. 5 depicts the cross sectional view C-C of the cooling device of Fig. 4 according to the present invention.
  • the rear wall heater (5a) is in thermal contact with the rear wall (1) of the storage compartment and the evaporator (4) and cushions in between the same.
  • Fig. 5 depicts the rear wall heater (5a) as a planar heater located on the frontal surface of the evaporator (4) whereas the defrost heater (5b) is depicted on a plane in parallel to the plane of the rear wall heater (5a), located on the rear or opposite surface of the evaporator.
  • a combined two part heater (5a,5b) is placed in direct contact with the evaporator (4) and without employing any isolation layer between said evaporator (4) and said combined two-part heater (5a,5b).
  • This embodiment has an advantage of utilizing part of the heat transferred from the rear wall heater (5a) to function also as defrosting means; thus the work load on the defrost heater (5b) can be minimized and the periodic heating durations can be shortened, eventually resulting in lower energy consumption of the cooling device. It further results in an enhanced cooling performance of the evaporator (4), and hence shorter power-off term during defrost cycles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Defrosting Systems (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
EP12813056.4A 2012-12-28 2012-12-28 Cooling device with combined heater for dew and frost prevention Active EP2938943B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12813056T PL2938943T3 (pl) 2012-12-28 2012-12-28 Urządzenie chłodzące z połączoną nagrzewnicą do zapobiegania powstawaniu rosy i szronu

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2012/077099 WO2014101962A1 (en) 2012-12-28 2012-12-28 Cooling device with combined heater for dew and frost prevention

Publications (2)

Publication Number Publication Date
EP2938943A1 EP2938943A1 (en) 2015-11-04
EP2938943B1 true EP2938943B1 (en) 2022-02-09

Family

ID=47522643

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12813056.4A Active EP2938943B1 (en) 2012-12-28 2012-12-28 Cooling device with combined heater for dew and frost prevention

Country Status (4)

Country Link
EP (1) EP2938943B1 (zh)
CN (1) CN105051473B (zh)
PL (1) PL2938943T3 (zh)
WO (1) WO2014101962A1 (zh)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0181781A2 (en) * 1984-11-15 1986-05-21 Kabushiki Kaisha Toshiba Refrigerator having mode-change chamber capable of operation within freezing, chill and refrigeration temperature ranges

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53130560A (en) 1977-04-20 1978-11-14 Hitachi Ltd Refrigerator
US5011101A (en) 1987-11-02 1991-04-30 Whirlpool Corporation Surface mounting spring clip
KR970075782A (ko) * 1996-05-31 1997-12-10 배순훈 냉각기 일체형 제상히터를 이용한 착상판 제상장치
JPH11118302A (ja) * 1997-10-15 1999-04-30 Matsushita Refrig Co Ltd 空気冷却装置
JP4476522B2 (ja) * 2001-08-15 2010-06-09 三菱電機株式会社 除霜ヒ−タ付き蒸発器及び該蒸発器使用の冷蔵庫
US6729152B2 (en) * 2001-10-24 2004-05-04 Carrier Corporation Thermal shield for evaporator with plastic outer covering
US6666043B2 (en) 2002-05-07 2003-12-23 Lg Electronics, Inc. Dewfall preventing device of refrigerator
KR100518885B1 (ko) * 2003-06-23 2005-09-30 엘지전자 주식회사 냉장고의 면상히터 고정구조
KR100577427B1 (ko) * 2004-08-19 2006-05-08 삼성전자주식회사 냉장고
JP2006220358A (ja) 2005-02-10 2006-08-24 Matsushita Electric Ind Co Ltd 冷蔵庫
JP2010038528A (ja) * 2008-07-10 2010-02-18 Toshiba Corp 冷蔵庫
WO2011080089A2 (en) * 2009-12-30 2011-07-07 Arcelik Anonim Sirketi A cooling device
JP2012042143A (ja) * 2010-08-20 2012-03-01 Hitachi Appliances Inc 冷蔵庫
CN202328985U (zh) * 2011-09-13 2012-07-11 珠海格力电器股份有限公司 冰箱

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0181781A2 (en) * 1984-11-15 1986-05-21 Kabushiki Kaisha Toshiba Refrigerator having mode-change chamber capable of operation within freezing, chill and refrigeration temperature ranges

Also Published As

Publication number Publication date
CN105051473B (zh) 2017-05-03
EP2938943A1 (en) 2015-11-04
CN105051473A (zh) 2015-11-11
WO2014101962A1 (en) 2014-07-03
PL2938943T3 (pl) 2022-05-16

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