WO2003008880A1 - A device for the rapid defrosting of the surface of evaporators - Google Patents
A device for the rapid defrosting of the surface of evaporators Download PDFInfo
- Publication number
- WO2003008880A1 WO2003008880A1 PCT/IT2002/000349 IT0200349W WO03008880A1 WO 2003008880 A1 WO2003008880 A1 WO 2003008880A1 IT 0200349 W IT0200349 W IT 0200349W WO 03008880 A1 WO03008880 A1 WO 03008880A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cooling plates
- rapid defrosting
- resistive sheet
- ptf
- evaporators according
- Prior art date
Links
- 238000010257 thawing Methods 0.000 title claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 60
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 3
- 208000034693 Laceration Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02741166A EP1407203A1 (en) | 2001-07-17 | 2002-05-30 | A device for the rapid defrosting of the surface of evaporators |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITVE01A000033 | 2001-07-17 | ||
ITVE20010033 ITVE20010033A1 (en) | 2001-07-17 | 2001-07-17 | DEVICE FOR QUICK DEFROSTING OF EVAPORATORS |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003008880A1 true WO2003008880A1 (en) | 2003-01-30 |
Family
ID=11461082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT2002/000349 WO2003008880A1 (en) | 2001-07-17 | 2002-05-30 | A device for the rapid defrosting of the surface of evaporators |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1407203A1 (en) |
IT (1) | ITVE20010033A1 (en) |
WO (1) | WO2003008880A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1467165A1 (en) * | 2003-04-08 | 2004-10-13 | Lg Electronics Inc. | Defroster for heat exchanger and fabrication method thereof |
EP1538411A2 (en) | 2003-12-01 | 2005-06-08 | Dometic Sweden AB | Heat exchanger arrangement |
US7237402B2 (en) | 2003-12-01 | 2007-07-03 | Dometic Sweden Ab | Refrigerator and method |
WO2012010422A3 (en) * | 2010-07-23 | 2012-04-12 | BSH Bosch und Siemens Hausgeräte GmbH | Refrigeration device with a defrosting device |
WO2013076004A3 (en) * | 2011-11-24 | 2013-09-26 | BSH Bosch und Siemens Hausgeräte GmbH | Evaporator for a refrigeration device and refrigeration device |
EP4102154A1 (en) * | 2021-06-08 | 2022-12-14 | Hauser GmbH | Heat exchanger for a refrigerated cabinet |
WO2024093781A1 (en) * | 2022-10-31 | 2024-05-10 | 青岛海尔电冰箱有限公司 | Defrosting heating device for refrigerator, and refrigerator |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1284419A (en) * | 1961-03-21 | 1962-02-09 | Siemens Elektrogeraete Gmbh | evaporator for refrigeration machines equipped with a defrosting device which can be electrically heated |
DE1816640A1 (en) | 1968-12-23 | 1970-07-02 | Robert Steger | Electrically operated defrosting device for refrigerators, freezers and other cooling devices, double insulated with wireless heating conductors |
US4432211A (en) * | 1980-11-17 | 1984-02-21 | Hitachi, Ltd. | Defrosting apparatus |
EP0918339A2 (en) * | 1997-11-06 | 1999-05-26 | Acheson Industries, Inc. | Electrical device containing positive temperature coefficient resistor composition and method of manufacturing the device |
EP1004835A2 (en) * | 1998-11-27 | 2000-05-31 | Whirlpool Corporation | Device for rapidly defrosting a refrigerator compartment, such as a freezer compartment or the like |
-
2001
- 2001-07-17 IT ITVE20010033 patent/ITVE20010033A1/en unknown
-
2002
- 2002-05-30 WO PCT/IT2002/000349 patent/WO2003008880A1/en not_active Application Discontinuation
- 2002-05-30 EP EP02741166A patent/EP1407203A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1284419A (en) * | 1961-03-21 | 1962-02-09 | Siemens Elektrogeraete Gmbh | evaporator for refrigeration machines equipped with a defrosting device which can be electrically heated |
DE1816640A1 (en) | 1968-12-23 | 1970-07-02 | Robert Steger | Electrically operated defrosting device for refrigerators, freezers and other cooling devices, double insulated with wireless heating conductors |
US4432211A (en) * | 1980-11-17 | 1984-02-21 | Hitachi, Ltd. | Defrosting apparatus |
EP0918339A2 (en) * | 1997-11-06 | 1999-05-26 | Acheson Industries, Inc. | Electrical device containing positive temperature coefficient resistor composition and method of manufacturing the device |
EP1004835A2 (en) * | 1998-11-27 | 2000-05-31 | Whirlpool Corporation | Device for rapidly defrosting a refrigerator compartment, such as a freezer compartment or the like |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1467165A1 (en) * | 2003-04-08 | 2004-10-13 | Lg Electronics Inc. | Defroster for heat exchanger and fabrication method thereof |
US7030344B2 (en) | 2003-04-08 | 2006-04-18 | Lg Electronics Inc. | Defroster for heat exchanger and fabrication method thereof |
EP1538411A2 (en) | 2003-12-01 | 2005-06-08 | Dometic Sweden AB | Heat exchanger arrangement |
US7036332B2 (en) | 2003-12-01 | 2006-05-02 | Dometic Sweden Ab | Heat exchanger arrangement |
US7237402B2 (en) | 2003-12-01 | 2007-07-03 | Dometic Sweden Ab | Refrigerator and method |
WO2012010422A3 (en) * | 2010-07-23 | 2012-04-12 | BSH Bosch und Siemens Hausgeräte GmbH | Refrigeration device with a defrosting device |
WO2013076004A3 (en) * | 2011-11-24 | 2013-09-26 | BSH Bosch und Siemens Hausgeräte GmbH | Evaporator for a refrigeration device and refrigeration device |
CN104364596A (en) * | 2011-11-24 | 2015-02-18 | Bsh博世和西门子家用电器有限公司 | Evaporator for a refrigeration device and refrigeration device |
EP4102154A1 (en) * | 2021-06-08 | 2022-12-14 | Hauser GmbH | Heat exchanger for a refrigerated cabinet |
WO2024093781A1 (en) * | 2022-10-31 | 2024-05-10 | 青岛海尔电冰箱有限公司 | Defrosting heating device for refrigerator, and refrigerator |
Also Published As
Publication number | Publication date |
---|---|
ITVE20010033A1 (en) | 2003-01-17 |
EP1407203A1 (en) | 2004-04-14 |
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