EP4102154B1 - Heat exchanger for a refrigerated cabinet - Google Patents
Heat exchanger for a refrigerated cabinet Download PDFInfo
- 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.)
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- 238000010438 heat treatment Methods 0.000 claims description 60
- 238000009413 insulation Methods 0.000 claims description 8
- 238000010257 thawing Methods 0.000 description 9
- 239000012809 cooling fluid Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 241000446313 Lamella Species 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
Images
Classifications
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- 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
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- 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
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- 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 plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
- H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
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- 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.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Defrosting Systems (AREA)
Description
Die Erfindung bezieht sich auf einen Wärmetauscher für ein Kühlmöbel mit einem einen Strömungskanal bildenden Lamellenpaket und einer elektrischen Abtauheizung.The invention relates to a heat exchanger for a refrigerator with a fin package forming a flow channel and an electric defrost heater.
Aus dem Stand der Technik sind Wärmetauscher mit integrierter Abtauheizung bekannt. Die
Nachteilig am Stand der Technik ist allerdings, dass die Heizstäbe aufgrund ihrer Lagerung in den Nuten innerhalb des Strömungskanals angeordnet sind. Dies verringert den effektiven Querschnitt des Strömungskanals und führt außerdem dazu, dass mit der von den Heizstäben abgegebenen Wärmemenge auch direkt die zu kühlende Luft erwärmt und damit nicht nur der Abtauvorgang verlangsamt, sondern auch die Kühlleistung des Wärmetauschers während dem Abtauvorgang gesenkt wird. Die
Der Erfindung liegt somit die Aufgabe zugrunde, einen Wärmetauscher der eingangs geschilderten Art so auszugestalten, der insbesondere während des Betriebs effizient und energiesparend abgetaut werden kann, ohne dabei seine Kühlleistung zu beeinträchtigen.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.
Die Aufgabe wird gelöst durch einen Wärmetauscher mit dem Merkmalen des Anspruchs 1, wobei die Abtauheizung ein an den Strömungskanal anschließendes und wenigstens abschnittsweise parallel zu diesem verlaufendes Flächenheizelement umfasst, das mit benachbarten Endabschnitten der Lamellen wärmeleitend verbunden ist. Aufgrund ihrer räumlichen Anordnung weist die Abtauheizung kein Element auf, das in den Strömungskanal ragt. Damit wird einerseits der effektive Strömungsquerschnitt des Strömungskanals nicht verringert und andererseits wird keine Verlustleistung zur direkten Erwärmung des Kühlfluidstroms im Strömungskanal generiert. Im Gegensatz zu einem Heizstab, der Wärmeenergie im Wesentlichen radial zu seiner Längsachse abgibt und mehrere Lamellen ausschließlich punktuell entlang seiner Längsachse wärmeleitend kontaktieren kann, gibt ein Flächenheizelement, wie beispielweise eine Heizfolie, seine Wärmemenge überwiegend quer zu einer effektiven Wärmeabgabefläche ab und ermöglicht somit eine größere Kontaktfläche mit den Lamellen. Dadurch wird der Wärmeeintrag in die Lamellen über Wärmeleitung erhöht und die Erwärmung des Kühlfluids im Strömungskanal vermindert, zumal die beim Abtauen abzuschmelzende Eisschicht auf den Lamellen das Kühlfluid gegenüber den erwärmten Lamellen isoliert.The object is achieved by a heat exchanger with the features of
Obwohl die Wärmeleitung zwischen den Endabschnitten der Lamellen und dem Flächenheizelement auch über zwischenliegende Bleche oder andere Bauteile erfolgen kann, kann die Wärmeenergie effizienter in die Lamellen eingeleitet und so der Energieverbrauch gesenkt werden, wenn das Flächenheizelement direkt an die benachbarten Endabschnitte der Lamellen angrenzt. Dies bedeutet, dass der wärmeleitende Kontakt zwischen den Endabschnitten der Lamellen und dem Flächenheizelement ohne weitere dazwischenliegende Bauteile hergestellt wird. Zufolge dieser Maßnahmen können Energie-bzw. Wärmeverluste verringert werden, da keine Energie von etwaigen dazwischenliegenden Bauelementen dissipiert, bzw. von den Lamellen weggeleitet wird.Although the heat conduction between the end sections of the slats and the surface heating element can also take place via intermediate metal sheets or other components, 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.
Der Anteil an Wärmeenergie, der mittels Wärmeleitung übertragen wird, kann gesteigert werden, indem die Endabschnitte der Lamellen parallel zum Flächenheizelement verlaufen. Durch den parallelen Verlauf wird die Oberfläche der Lamellen, die zum Kontakt mit dem Flächenheizelement und damit zur Wärmeleitung zur Verfügung steht, vergrößert. Wird der Abstand zwischen zueinander parallel verlaufenden Lamellen nicht gleichzeitig verändert, verkleinern sich zusätzlich die Luftspalte zwischen den Endabschnitten der Lamellen, wodurch der Anteil der Wärmemenge, die durch Wärmestrahlung übertragen wird, zugunsten der effizienteren Wärmeleitung sinkt.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.
Auch wenn der Wärmeeintrag bevorzugter Weise möglichst in die Endabschnitte aller Lamellen eingeleitet werden soll, kann bereits ein möglichst rasches und gleichmäßiges Abtauergebnis erzielt und eine unnötige Erwärmung des Kühlfluids vermieden werden, wenn wenigstens 15%, bevorzugt 30%, noch bevorzugter 75% der Endabschnitte der Lamellen mit dem Flächenheizelement wärmeleitend verbunden sind. Auf diese Weise erfolgt der Wärmeeintrag in die Lamellen äußerst gleichmäßig, wobei sich herausgestellt hat, dass ab diesem Prozentsatz eine Wärmeleitung zwischen den einzelnen Lamellen weitgehend unterbleiben kann und somit die die Lamellen gegenüber dem Kühlfluid isolierende Eisschicht gleichmäßig abschmilzt. Dadurch wird der punktuelle Wärmeeintrag in das Kühlfluid in Bereichen, in denen die Eisschicht bereits abgeschmolzen ist während eine weitere Erwärmung zum Abschmelzen anderer Bereiche erforderlich ist, weitgehend vermieden.Even if the heat input should preferably be introduced into the end sections of all slats as far as possible, 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. In this way, 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.
Die Dimensionierung des Flächenheizelements kann einfach an die Dimensionen des zu heizenden Lamellenpakets angepasst werden, wenn das Flächenheizelement ein Heizkabel umfasst. So kann beispielsweise zuerst eine flächige Wärmebrücke, wie beispielsweise ein Wärmeleitblech oder eine Wärmeleitfolie, an die Dimensionen des Lamellenpakets angepasst und wärmeleitend mit den Endabschnitten der Lamellen verbunden werden. Anschließend wird diese Wärmebrücke mittels Heizkabel beheizt, sodass eine effektive Wärmeabgabefläche entsteht. So muss nur die flächige, einfach zu bearbeitende Komponente des Flächenheizelements an die Dimensionen des Lamellenpakets angepasst werden, wobei das Heizkabel je nach Länge beispielsweise mäanderförmig auf der Wärmebrücke verlegt und mit dieser wärmeleitend verbunden wird.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. For example, one can first 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. So only 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.
Damit keine hohe Verlustleistung generiert wird und außer dem Wärmetauscher keine weiteren Komponenten des Kühlmöbels beheizt werden, wird erfindungsgemäß die den Lamellen gegenüberliegende Seite des Flächenheizelementes mit einer Wärmeisolierung abgedeckt. So kann die vom Flächenheizelement abgegebene Wärmemenge räumlich gezielter in die Endabschnitte der Lamellen eingeleitet werden, während die Isolationsschicht benachbarte Bauteile thermisch abschirmt. Dadurch kann die Temperatur im Kühlmöbel konstanter gehalten werden, was den Energieverbrauch senkt. Erfindungsgemäß weist die Wärmeisolierung eine dem Lamellenpaket zugewandte Wärmereflektionsschicht auf, sodass das Flächenheizelement seine Wärmeenergie im Wesentlichen nur in Richtung der Lamellen abgibt.So that no high power loss is generated and no other components of the refrigerated cabinet are heated apart from the heat exchanger, according to the invention the side of the surface heating element opposite the slats is covered with thermal insulation. In this way, the amount of heat emitted by the surface heating element can be introduced into the end sections of the slats in a more spatially targeted manner, while the insulation layer thermally shields neighboring components. This allows the temperature in the refrigerator to be kept more constant, which reduces energy consumption. According to the invention, 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.
Da die den Lamellen mit zunehmender Entfernung von dem Flächenheizelement weniger erwärmt werden, sind bei entsprechend langen Lamellen starke Heizleistungen nötig um die dem Flächenheizelement abgewandten Endabschnitte der Lamellen hinreichend abzutauen. Da die benötigte Heizleistung pro Länge aufgrund von Dissipationseffekten aber nicht konstant ist, kann dies zu hohem Energiebedarf bei längeren Lamellen führen. Dieser Energiebedarf zum effizienten Abtauen kann allerdings gesenkt und der Wärmetauscher schneller abgetaut werden, wenn wenigstens zwei Flächenheizelemente vorgesehen sind, die an zwei gegenüberliegenden Seiten des Lamellenpakets mit benachbarten Endabschnitten der Lamellen einer Seite wärmeleitend verbunden sind. Wird nämlich das Lamellenpaket von gegenüberliegenden Seiten mit der Wärmeenergie beaufschlagt, müssen die Lamellen nur jeweils zur halben Länge abgetaut werden, wodurch die benötigte Heizleistung pro Länge in einem energetisch effizienten Bereich gehalten werden kann.Since 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.
In der Zeichnung ist der Erfindungsgegenstand beispielsweise dargestellt. Es zeigen
-
Fig. 1 eine schematische Vorderansicht des erfindungsgemäßen Wärmetauschers, -
Fig. 2 , eine schematische Draufsicht auf den Wärmetauscher und -
Fig. 3 eine derFig. 1 entsprechende Ansicht mit zwei Flächenheizelementen.
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Fig. 1 a schematic front view of the heat exchanger according to the invention, -
Fig. 2 , a schematic top view of the heat exchanger and -
Fig. 3 one of theFig. 1 Corresponding view with two surface heating elements.
Ein erfindungsgemäßer Wärmetauscher für ein Kühlmöbel umfasst einen von einem Lamellenpaket gebildeten Strömungskanal 1, der von einem Kühlfluid, wie beispielsweise Luft, in der Strömungsrichtung 2 durchlaufen wird, und eine elektrische Abtauheizung. Die Abtauheizung ist zum Abtauen der Lamellen 5 vorgesehen und weist ein Flächenheizelement 3, welches mit den Endabschnitten4 der Lamellen 5 des Lamellenpakets wärmeleitend verbunden ist, auf. Um die vom Flächenheizelement 3 abgegebene Wärmeenergie möglichst effizient und mit möglichst geringer Verlustleistung in die Lamellen 5 einzuleiten, ist das Flächenheizelement 3 direkt mit den benachbarten Endabschnitten 4 verbunden. Die Interaktionsfläche und damit die Wärmeleitung zwischen den Endabschnitten 4 der Lamellen 5 und dem Flächenheizelement 3 kann erhöht werden, wenn die Endabschnitte 4 der Lamellen 5 parallel zum Flächenheizelement 3 verlaufen. Dies verringert zusätzlich den Anteil der Wärmeenergie, die über Wärmestrahlung abgegeben wird und damit nicht gezielt in die Lamellen 5 eingeleitet werden kann.A heat exchanger according to the invention for a refrigerated cabinet comprises a
Das Flächenheizelement kann aus mehreren Bauteilen zusammengesetzt sein, beispielsweise kann es ein Heizkabel 6 umfassen, welches mäanderförmig auf einem Wärmeleitblech 7 angeordnet ist. In diesem Fall wird die Wärmeenergie über das Heizkabel 6 zugeführt, und über die Oberfläche des Wärmeleitblechs 7 in die Endabschnitte 4 der Lamellen 5 eingeleitet. Ein wesentlicher Vorteil dabei liegt darin, dass die effektive Wärmeabgabefläche des Flächenheizelements 3, also in diesem Fall die freie Oberfläche des Wärmeleitblechs 7, einfach an die Oberfläche des Lamellenpakets angepasst werden kann. So muss nur das einfach zu verarbeitende und billige Wärmeleitblech 7 zugeschnitten und das Heizkabel 6 auf diesem angeordnet werden. Da ausschließlich die Lamellen 5 abgetaut werden sollen, gilt es zu vermeiden, dass ein Teil der Wärmeenergie an andere Bauteile des Kühlmöbels abgegeben wird und dadurch sowohl die Abtau-, als auch die Kühlleistung gesenkt wird. Deswegen ist die den Lamellen 5 gegenüberliegenden Seite des Flächenheizelements 3 mit einer Wärmeisolierung 8 abgedeckt. Erfindungsgemäß weist die Wärmeisolierung 8 auf der den Endabschnitten 4 der Lamellen 5 zugewandten Seite noch eine Wärmereflexionsschicht (nicht dargestellt) auf, beispielsweise eine Aluminiumfolie. Somit kann die sonst von der Wärmeisolierung 8 aufgenommene Wärmenergie ebenfalls in die Endabschnitte 4 der Lamellen 5 geleitet werden. Eine Kühlleitung 9, die von einem verdampfenden Kältemittel durchströmt wird, ist mit den Lamellen 5 verbunden, um diese abzukühlen. Die Lamellen 5 können energiesparender abgetaut werden, wenn an gegenüberliegenden Seiten des Lamellenpakets ein Flächenheizelement 3 vorgesehen ist. So kann die zugeführte Wärmeenergie jedes Flächenheizelements 3 so bemessen sein, dass sie die Lamellen 5 nur bis zur Mitte abtaut, wodurch weniger Energie dissipiert wird.The surface heating element can be composed of several components, for example it can include a
Claims (6)
- Heat exchanger for a refrigerated cabinet with a fin stack forming a flow channel (1) and an electric defrost heater, wherein the defrost heater comprises a sheet-type heating element (3) adjoining the flow channel (1) and extending at least in sections parallel thereto, which is connected in a heat-conducting manner to adjacent end sections (4) of the fins (5), the side of the sheet-type heating element (3) opposite the fins (5) being covered with a heat insulation (8), characterized in that the heat insulation (8) has a heat-reflecting layer on the side facing the end sections (4) of the fins (5).
- Heat exchanger according to claim 1, characterized in that the sheet-type heating element (3) is directly adjoining the adjacent end sections (4) of the fins (5).
- Heat exchanger according to claim 1 or 2, characterized in that the end sections (4) of the fins (5) run parallel to the sheet-type heating element (3).
- Heat exchanger according to one of claims 1 to 3, characterized in that at least 15% of the end sections (4) of the fins (5) are connected to the sheet-type heating element (3) in a heat-conducting manner.
- Heat exchanger according to one of claims 1 to 4, characterized in that the sheet-type heating element comprises a heating cable (6).
- Heat exchanger according to one of claims 1 to 5, characterized in that at least two sheet-type heating elements (3) are provided, which are connected in a heat-conducting manner to adjacent end sections (4) of the fins (5) of one side on two opposite sides of the fin pack.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21178283.4A EP4102154B1 (en) | 2021-06-08 | 2021-06-08 | Heat exchanger for a refrigerated cabinet |
| HUE21178283A HUE065403T2 (en) | 2021-06-08 | 2021-06-08 | Heat exchanger for a refrigerated cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21178283.4A EP4102154B1 (en) | 2021-06-08 | 2021-06-08 | Heat exchanger for a refrigerated cabinet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4102154A1 EP4102154A1 (en) | 2022-12-14 |
| EP4102154B1 true EP4102154B1 (en) | 2024-01-17 |
Family
ID=76355275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21178283.4A Active EP4102154B1 (en) | 2021-06-08 | 2021-06-08 | Heat exchanger for a refrigerated cabinet |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP4102154B1 (en) |
| HU (1) | HUE065403T2 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2251295B (en) * | 1990-12-31 | 1994-09-28 | Samsung Electronics Co Ltd | Defrost assembly |
| ITVE20010033A1 (en) * | 2001-07-17 | 2003-01-17 | Alper Srl | DEVICE FOR QUICK DEFROSTING OF EVAPORATORS |
| DE20203571U1 (en) | 2002-03-06 | 2002-05-29 | Linde Ag | Evaporator with integrated defrost heater |
| KR100686764B1 (en) * | 2003-06-18 | 2007-02-23 | 엘지전자 주식회사 | Rexam heater |
| KR101037651B1 (en) * | 2008-06-27 | 2011-05-30 | 주식회사 아모그린텍 | Defrost Heater of Surface Type |
| DE102011006862A1 (en) * | 2011-04-06 | 2012-10-11 | BSH Bosch und Siemens Hausgeräte GmbH | Evaporator assembly for a refrigeration device |
-
2021
- 2021-06-08 EP EP21178283.4A patent/EP4102154B1/en active Active
- 2021-06-08 HU HUE21178283A patent/HUE065403T2/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| HUE065403T2 (en) | 2024-05-28 |
| EP4102154A1 (en) | 2022-12-14 |
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