EP1407203A1 - Dispositif permettant le degivrage rapide de la surface d'evaporateurs - Google Patents

Dispositif permettant le degivrage rapide de la surface d'evaporateurs

Info

Publication number
EP1407203A1
EP1407203A1 EP02741166A EP02741166A EP1407203A1 EP 1407203 A1 EP1407203 A1 EP 1407203A1 EP 02741166 A EP02741166 A EP 02741166A EP 02741166 A EP02741166 A EP 02741166A EP 1407203 A1 EP1407203 A1 EP 1407203A1
Authority
EP
European Patent Office
Prior art keywords
cooling plates
rapid defrosting
resistive sheet
ptf
evaporators according
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Withdrawn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
EP02741166A
Other languages
German (de)
English (en)
Inventor
Valerio Bresolin
Danielle Ragazzon
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.)
ALPER Srl
Original Assignee
ALPER Srl
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 ALPER Srl filed Critical ALPER Srl
Publication of EP1407203A1 publication Critical patent/EP1407203A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • 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

Definitions

  • a device for the rapid defrosting of the surface of evaporators is provided.
  • the present invention relates to a device which is applied to an evaporator in order to defrost the ice layer build-up, used in refrigeration circuits or units.
  • the evaporators in refrigerating circuits usually consist of a number of cooling plates parallelly arranged and suitably spaced therebetween. Openings are obtained in the cooling plates, inside which a cooling coil is inserted.
  • a refrigerant circulates inside the cooling coil which, thanks to the physical contact and, then, to the thermal exchange between the coil and the cooling plates, allows for the lowering of the temperature of the plates and, consequently the cooling of the space wherein the evaporator is contained.
  • the aim of the present invention is to create a device which permits to fully use the characteristics offered by the resistive sheets and, then, a device wherein the heat exchange between the resistive sheets and said cooling plates is more fully optimized.
  • a device for the rapid defrosting of the surface of evaporators comprising pellicular resistive means, said evaporator including a number of cooling plates spaced parallelly spaced apart therebetween having openings in which a cooling coil is inserted, characterized in that said pellicular resistive means comprise at least one PTF resistive sheet, said at least one PTF resistive sheet and said cooling plates being physically in contact therebetween, that said physical contact is located in a number of areas and that, at said physical contact areas, surfaces of thermal exchange are provided so as to increase the efficiency of heat transmission from said at least one PTF resistive sheet to said cooling plates.
  • the surfaces of thermal exchange are made of perpendicular flaps located on the edges of the cooling plates, the perpendicular flaps being located substantially in a plane and said at least one PTF resistive sheet being placed on the perpendicular flaps.
  • the heat transmission between the PTF resistive sheet and the cooling plates occurs over a large surface of contact, therefore allowing for an optimum distribution of the heat generation.
  • the defrosting time is notably decreased and, at the same time, it is possible to decrease the electrical power dissipated by the PTF resistive sheet.
  • said perpendicular flaps are obtained by L-bending the adj acent edges of said cooling plates.
  • FIG. 1 is a partial and schematic prospective view of a device according to the present invention.
  • FIG. 2 is a partial prospective view of a cooling plate of the device of figure 1;
  • figure 3 is a partial cross section of the evaporator of figure 1 ;
  • FIG. 4 is a partial cross section of the evaporator containing the device according to a first variant of the invention
  • FIG. 5 is a partial prospective view of a cooling plate according to a second variant of the invention.
  • FIG. 6 is a top view of a resistive sheet according to a third variant of the invention.
  • An evaporator indicated by 10 is represented in figure 1, comprising a device 12 for the rapid defrosting of the surface of the evaporator.
  • the evaporator 10 comprises a number of cooling plates 14 (shown better in figure 2) each having a rectangular shape with an L-shaped bended edge 14a to form a perpendicular flap 16.
  • the dimensions of the L-shaped bended edges 14 are the same so as the perpendicular flaps 1 are arranged on the same plane.
  • Openings 18 are made in the cooling plates 14 inside which a cooling coil 20 is inserted and is comprised of rectilinear portions 21a and curved portions 21b, as represented in figure 3.
  • the openings 18 have wide, and circle-like ends 18a, so as to house the rectilinear portions 21a of the cooling coil 20 which orthogonally passes into all the cooling plates 14.
  • the device 12 comprises a resistive sheet 22 of the PTF-type (polymer thick film) placed on the perpendicular flaps 16 of the cooling plates 14.
  • the PTF resistive sheet 22 contains various conductive areas or tracks 22a electrically connected therebetween which are supplied by an electrical supply source.
  • the resistive sheet 22 has preferably PTC characteristics (positive coefficient temperature) so that, when the temperature increases, the value of the electrical resistance increases, thus limiting the electrical current which flows into it.
  • edges 14a of the cooling plates 14 may all be L-bent on the same side, as indicated in figure 2, or each edge 14a may be indifferently bent on one side or on the other side. Furthemore, it is possible to bend all the edges 14a of the cooling plates 14, or only a limited number of them, for example only the odd numbers, i.e. the first one, the third one and so on. In order to assure a sufficient transmission of heat, the number of the cooling plates 14, in which the edges 14a have been bent into an L-shape, should be preferably greater than 30% of the total amount.
  • the perpendicular flaps 16 extend over a length equal to that of the cooling plates 14 and over a width equal to at least two times the thickness of the cooling plates 14.
  • the device 12 consists of applying a resistive sheet 22 over the edges 14a of the cooling plates 14 by interposing a thermal conductive paste 30, of a well- known type such as those composed of silicone and metallic oxides.
  • the paste 20 allows for an efficacious transmission of the heat from the resistive sheet 22 to the edges 14a of the cooling plates 14.
  • the paste 30 should be adhesive and electrically insulated.
  • the adhesive paste 30 allows for a firm fixing of the resistive sheet 22 to the edges 14a of the cooling plates 14 and, being electrically insulated, it avoids electrical contacts between the parts under tension (the resistive sheet 12) and the evaporator 10, in case of laceration of the resistive sheet 22.
  • FIG 5 a second variant of the invention is represented, wherein the resistive sheets 122 have the same shape, but slightly smaller in respect to that of the cooling plates 14, and they are placed over the surfaces of the cooling plates 14. Openings 124 are made into the resistive sheets 122 so that the latter do not cover the openings 18 of the cooling plates 14. It is possible to apply a resistive sheet 122 over each cooling plate 124, or only over a reduced number of them, but preferably greater than 30%.
  • FIG 6 a third variant of the invention is illustrated, wherein the resistive sheets 222 used are comb-shaped with prongs 224 designed to be inserted into the openings 18 of the cooling plates 14.
  • the width of the prongs 222 must be equal to the width of the openings 18 of the cooling plates 14.
  • the total number of the resistive sheets 222 and, then, of the prongs 224 could fill all the openings 18 of the cooling plates 14, or only a reduced number of them, but still preferably more than 30% of the total amount. It is evident mat conceptually and functionally equivalent variants fall inside the protection field of the present invention.
  • thermically conductive paste 30 it is possible to use a thermically conductive paste 30 also in cases wherein the resistive sheet 22 is placed over the flaps 16 obtained by L- bending the ends 14a of the cooling plates 14.

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)

Abstract

L'invention concerne un dispositif permettant un dégivrage rapide (12), lequel dispositif comprend des feuilles résistives (22) déposées par dessus un évaporateur (10) qui contient plusieurs plaques de refroidissement (14). Les feuilles résistives (22) et les plaques de refroidissement (14) sont physiquement en contact; le contact physique s'établit dans plusieurs zones dans lesquelles sont situées des surfaces (16, 30) d'échange thermique, de manière à améliorer l'efficacité de la transmission de chaleur depuis les feuilles résistives (22) vers les plaques de refroidissement (14).
EP02741166A 2001-07-17 2002-05-30 Dispositif permettant le degivrage rapide de la surface d'evaporateurs Withdrawn EP1407203A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ITVE20010033 ITVE20010033A1 (it) 2001-07-17 2001-07-17 Dispositivo per il rapido sbrinamento di evaporatori
ITVE20010033 2001-07-17
PCT/IT2002/000349 WO2003008880A1 (fr) 2001-07-17 2002-05-30 Dispositif permettant le degivrage rapide de la surface d'evaporateurs

Publications (1)

Publication Number Publication Date
EP1407203A1 true EP1407203A1 (fr) 2004-04-14

Family

ID=11461082

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02741166A Withdrawn EP1407203A1 (fr) 2001-07-17 2002-05-30 Dispositif permettant le degivrage rapide de la surface d'evaporateurs

Country Status (3)

Country Link
EP (1) EP1407203A1 (fr)
IT (1) ITVE20010033A1 (fr)
WO (1) WO2003008880A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100664051B1 (ko) * 2003-04-08 2007-01-03 엘지전자 주식회사 열교환기의 제상장치
SE0303235D0 (sv) 2003-12-01 2003-12-01 Dometic Sweden Ab Heat exchanger arrangement
SE0303234D0 (sv) 2003-12-01 2003-12-01 Dometic Sweden Ab Refrigerator and method
DE102010038384A1 (de) * 2010-07-23 2012-01-26 BSH Bosch und Siemens Hausgeräte GmbH Kältegerät mit Abtaueinrichtung
DE102011087029A1 (de) * 2011-11-24 2013-05-29 BSH Bosch und Siemens Hausgeräte GmbH Verdampfer für ein Kältegerät und Kältegerät
PL4102154T3 (pl) * 2021-06-08 2024-06-24 Hauser Gmbh Wymiennik ciepła dla szafy chłodniczej
CN117989797A (zh) * 2022-10-31 2024-05-07 青岛海尔电冰箱有限公司 用于冰箱的化霜加热装置及冰箱

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1284419A (fr) * 1961-03-21 1962-02-09 Siemens Elektrogeraete Gmbh évaporateur pour machines frigorifiques équipé d'un dispositif de dégivrage pouvant être chauffé électriquement
DE1816640A1 (de) 1968-12-23 1970-07-02 Robert Steger Elektrisch betriebenes Abtaugeraet fuer Kuehlschraenke,Kuehltruhen und sonstige Kuehleinrichtungen,doppelt isoliert mit drahtlosen Heizleitern
US4432211A (en) * 1980-11-17 1984-02-21 Hitachi, Ltd. Defrosting apparatus
US5993698A (en) * 1997-11-06 1999-11-30 Acheson Industries, Inc. Electrical device containing positive temperature coefficient resistor composition and method of manufacturing the device
IT244406Y1 (it) * 1998-11-27 2002-03-11 Whirlpool Co Dispositivo per lo scongelamento rapido di un vano di unrefrigeratore quale un vano congelatore o similare

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO03008880A1 *

Also Published As

Publication number Publication date
ITVE20010033A1 (it) 2003-01-17
WO2003008880A1 (fr) 2003-01-30

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