EP4102154B1 - Wärmetauscher für ein kühlmöbel - Google Patents

Wärmetauscher für ein kühlmöbel Download PDF

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Publication number
EP4102154B1
EP4102154B1 EP21178283.4A EP21178283A EP4102154B1 EP 4102154 B1 EP4102154 B1 EP 4102154B1 EP 21178283 A EP21178283 A EP 21178283A EP 4102154 B1 EP4102154 B1 EP 4102154B1
Authority
EP
European Patent Office
Prior art keywords
heat
heating element
heat exchanger
slats
end sections
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
EP21178283.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP4102154A1 (de
Inventor
Manfred Gabriel
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.)
Hauser GmbH
Original Assignee
Hauser GmbH
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 Hauser GmbH filed Critical Hauser GmbH
Priority to PL21178283.4T priority Critical patent/PL4102154T3/pl
Priority to HUE21178283A priority patent/HUE065403T2/hu
Priority to EP21178283.4A priority patent/EP4102154B1/de
Publication of EP4102154A1 publication Critical patent/EP4102154A1/de
Application granted granted Critical
Publication of EP4102154B1 publication Critical patent/EP4102154B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • 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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater non-flexible
    • H05B3/28—Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54

Definitions

  • the invention relates to a heat exchanger for a refrigerator with a fin package forming a flow channel and an electric defrost heater.
  • Heat exchangers with integrated defrost heating are known from the prior art.
  • the DE20203571 U1 shows such a heat exchanger with a flow channel for cooling air, in which grooves running transversely to the flow direction parallel to the longitudinal axis of the heat exchanger are provided. These grooves protrude into the flow channel and are used to accommodate heating elements for defrosting the heat exchanger.
  • the heating elements By arranging the heating elements in the grooves, the contact between the heating element and the heat exchanger is improved, thereby increasing the defrosting efficiency. Likewise, defective heating elements can be easily removed thanks to this arrangement.
  • the disadvantage of the prior art is that the heating elements are arranged within the flow channel due to their storage in the grooves. This reduces the effective cross section of the flow channel and also means that the amount of heat released by the heating elements directly heats the air to be cooled and thus not only slows down the defrosting process, but also reduces the cooling capacity of the heat exchanger during the defrosting process.
  • the DE20203571 U1 describes an arrangement of the heating elements on the outside of the heat exchanger in order not to reduce the flow cross section, but this leads to increased power loss of the heating elements In this case, a significant part of the heat energy released is not released to the heat exchanger, but to the environment.
  • the invention is therefore based on the object of designing a heat exchanger of the type described at the beginning, which can be defrosted efficiently and energy-savingly, particularly during operation, without impairing its cooling performance.
  • KR 100 686 764 B1 discloses a heat exchanger according to the preamble of claim 1.
  • the defrost heater comprises a surface heating element which adjoins the flow channel and runs at least in sections parallel to it and which is connected in a heat-conducting manner to adjacent end sections of the slats. Due to its spatial arrangement, the defrost heater does not have any element that protrudes into the flow channel. On the one hand, this does not reduce the effective flow cross section of the flow channel and, on the other hand, no power loss is generated for direct heating of the cooling fluid flow in the flow channel.
  • a surface heating element such as a heating foil, emits its heat predominantly transversely to an effective heat emission surface and thus enables a larger one Contact surface with the slats. This increases the heat input into the slats via heat conduction and reduces the heating of the cooling fluid in the flow channel, especially since the layer of ice on the slats that melts during defrosting insulates the cooling fluid from the heated slats.
  • the thermal energy can be introduced into the slats more efficiently and energy consumption can thus be reduced if the surface heating element is directly adjacent to the adjacent end sections of the slats. This means that the heat-conducting contact between the end sections of the fins and the Surface heating element is manufactured without any other intermediate components. As a result of these measures, energy or Heat losses are reduced because no energy is dissipated from any intermediate components or directed away from the slats.
  • the proportion of heat energy that is transferred by heat conduction can be increased by having the end sections of the slats run parallel to the surface heating element.
  • the parallel course increases the surface area of the slats that is available for contact with the surface heating element and thus for heat conduction. If the distance between mutually parallel slats is not changed at the same time, the air gaps between the end sections of the slats also become smaller, as a result of which the proportion of the amount of heat that is transferred through thermal radiation decreases in favor of more efficient heat conduction.
  • the fastest and most uniform defrosting result possible can be achieved and unnecessary heating of the cooling fluid can be avoided if at least 15%, preferably 30%, even more preferably 75% of the end sections of the Slats are connected to the surface heating element in a heat-conducting manner.
  • the heat input into the slats is extremely uniform, and it has been found that from this percentage onwards, heat conduction between the individual slats can largely be avoided and the ice layer that insulates the slats from the cooling fluid melts evenly. This largely avoids the selective heat input into the cooling fluid in areas in which the ice layer has already melted while further heating is required to melt other areas.
  • the dimensioning of the surface heating element can be easily adapted to the dimensions of the fin package to be heated if the surface heating element includes a heating cable.
  • a flat thermal bridge such as a heat-conducting plate or a heat-conducting foil, is adapted to the dimensions of the lamella pack and connected to the end sections of the lamellas in a heat-conducting manner. This thermal bridge is then heated using a heating cable, creating an effective heat dissipation surface.
  • the flat, easy-to-machine component of the surface heating element needs to be adapted to the dimensions of the lamella pack, with the heating cable being laid, for example, in a meandering shape on the thermal bridge depending on its length and connected to it in a heat-conducting manner.
  • the side of the surface heating element opposite the slats is covered with thermal insulation.
  • the thermal insulation has a heat reflection layer facing the slat pack, so that the surface heating element essentially only releases its heat energy in the direction of the slats.
  • the slats are heated less as the distance from the surface heating element increases, high heating outputs are required for correspondingly long slats in order to sufficiently defrost the end sections of the slats facing away from the surface heating element. Since the required heating output per length is not constant due to dissipation effects, this can lead to high energy requirements for longer slats. However, this energy requirement for efficient defrosting can be reduced and the heat exchanger can be defrosted more quickly if at least two surface heating elements are provided, which are connected in a heat-conducting manner on two opposite sides of the fin stack to adjacent end sections of the fins on one side. That's what it will be If the heat energy is applied to the slat pack from opposite sides, the slats only need to be defrosted along half their length, which means that the required heating output per length can be kept in an energetically efficient range.
  • a heat exchanger according to the invention for a refrigerated cabinet comprises a flow channel 1 formed by a plate pack, through which a cooling fluid, such as air, passes through in the flow direction 2, and an electric defrost heater.
  • the defrost heater is provided for defrosting the slats 5 and has a surface heating element 3, which is connected in a heat-conducting manner to the end sections 4 of the slats 5 of the slat pack.
  • the surface heating element 3 is connected directly to the adjacent end sections 4.
  • the interaction surface and thus the heat conduction between the end sections 4 of the slats 5 and the surface heating element 3 can be increased if the end sections 4 of the slats 5 run parallel to the surface heating element 3. This additionally reduces the proportion of thermal energy that is given off via thermal radiation and therefore cannot be specifically introduced into the slats 5.
  • the surface heating element can be composed of several components, for example it can include a heating cable 6, which is arranged in a meandering shape on a heat-conducting plate 7.
  • the thermal energy is supplied via the heating cable 6 and introduced into the end sections 4 of the slats 5 via the surface of the heat-conducting plate 7.
  • a significant advantage is that the effective heat emission surface of the surface heating element 3, i.e In this case, the free surface of the heat-conducting plate 7 can be easily adapted to the surface of the plate pack. So all you have to do is cut the easy-to-process and cheap heat-conducting plate 7 and arrange the heating cable 6 on it.
  • the thermal insulation 8 also has a heat reflection layer (not shown), for example an aluminum foil, on the side facing the end sections 4 of the slats 5. The heat energy otherwise absorbed by the thermal insulation 8 can therefore also be conducted into the end sections 4 of the slats 5.
  • a cooling line 9, through which an evaporating refrigerant flows, is connected to the fins 5 in order to cool them.
  • the slats 5 can be defrosted in a more energy-saving manner if a surface heating element 3 is provided on opposite sides of the slat pack.
  • the heat energy supplied to each surface heating element 3 can be dimensioned such that it only defrosts the slats 5 up to the middle, as a result of which less energy is dissipated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Defrosting Systems (AREA)
EP21178283.4A 2021-06-08 2021-06-08 Wärmetauscher für ein kühlmöbel Active EP4102154B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL21178283.4T PL4102154T3 (pl) 2021-06-08 2021-06-08 Wymiennik ciepła dla szafy chłodniczej
HUE21178283A HUE065403T2 (hu) 2021-06-08 2021-06-08 Hõcserélõ hûtõszekrényhez
EP21178283.4A EP4102154B1 (de) 2021-06-08 2021-06-08 Wärmetauscher für ein kühlmöbel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21178283.4A EP4102154B1 (de) 2021-06-08 2021-06-08 Wärmetauscher für ein kühlmöbel

Publications (2)

Publication Number Publication Date
EP4102154A1 EP4102154A1 (de) 2022-12-14
EP4102154B1 true EP4102154B1 (de) 2024-01-17

Family

ID=76355275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21178283.4A Active EP4102154B1 (de) 2021-06-08 2021-06-08 Wärmetauscher für ein kühlmöbel

Country Status (3)

Country Link
EP (1) EP4102154B1 (pl)
HU (1) HUE065403T2 (pl)
PL (1) PL4102154T3 (pl)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2251295B (en) * 1990-12-31 1994-09-28 Samsung Electronics Co Ltd Defrost assembly
ITVE20010033A1 (it) * 2001-07-17 2003-01-17 Alper Srl Dispositivo per il rapido sbrinamento di evaporatori
DE20203571U1 (de) 2002-03-06 2002-05-29 Linde Ag, 65189 Wiesbaden Verdampfer mit integrierter Abtauheizung
KR100686764B1 (ko) * 2003-06-18 2007-02-23 엘지전자 주식회사 면상히터
KR101037651B1 (ko) * 2008-06-27 2011-05-30 주식회사 아모그린텍 제상용 면상 히터
DE102011006862A1 (de) * 2011-04-06 2012-10-11 BSH Bosch und Siemens Hausgeräte GmbH Verdampferbaugruppe für ein Kältegerät

Also Published As

Publication number Publication date
PL4102154T3 (pl) 2024-06-24
HUE065403T2 (hu) 2024-05-28
EP4102154A1 (de) 2022-12-14

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