EP3230664B1 - Réfrigérateur no-frost - Google Patents

Réfrigérateur no-frost Download PDF

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Publication number
EP3230664B1
EP3230664B1 EP15801445.6A EP15801445A EP3230664B1 EP 3230664 B1 EP3230664 B1 EP 3230664B1 EP 15801445 A EP15801445 A EP 15801445A EP 3230664 B1 EP3230664 B1 EP 3230664B1
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EP
European Patent Office
Prior art keywords
evaporator
refrigerator according
thermosiphon
passage
valve
Prior art date
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Active
Application number
EP15801445.6A
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German (de)
English (en)
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EP3230664A1 (fr
Inventor
Niels Liengaard
Matthias Mrzyglod
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP3230664A1 publication Critical patent/EP3230664A1/fr
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    • 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
    • F25D21/12—Removing frost by hot-fluid circulating system separate from the refrigerant system
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B23/00—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect
    • F25B23/006—Machines, plants or systems, with a single mode of operation not covered by groups F25B1/00 - F25B21/00, e.g. using selective radiation effect boiling cooling systems
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
    • F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F28D1/0478—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag the conduits having a non-circular cross-section
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/02—Details of evaporators
    • F25B2339/023—Evaporators consisting of one or several sheets on one face of which is fixed a refrigerant carrying coil
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2339/00—Details of evaporators; Details of condensers
    • F25B2339/04—Details of condensers
    • F25B2339/047—Water-cooled condensers
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/11—Sensor to detect if defrost is necessary
    • 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
    • F28F1/122—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 and being formed of wires
    • 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
    • F28F1/14—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 and extending longitudinally
    • F28F1/22—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 and extending longitudinally the means having portions engaging further tubular elements

Definitions

  • the present invention relates to a refrigeration device, in particular a household refrigeration device, with an automatically defrosting evaporator.
  • a refrigeration device in particular a household refrigeration device, with an automatically defrosting evaporator.
  • Such refrigeration devices are also known as "no-frost refrigeration devices”.
  • the evaporator Since the evaporator always forms the coldest point in the storage chamber of a refrigeration device, moisture that is given off by the refrigerated goods or that enters the storage chamber with the ambient air when a door is opened is deposited on the evaporator.
  • the layer of ice that forms in this way hinders the exchange of heat between the evaporator and the rest of the storage chamber and must therefore be removed from time to time in order to ensure energy-efficient operation of the refrigeration device.
  • a refrigeration device with a multi-channel coextruded evaporator in which a main channel is provided to carry a refrigerant and a defrosting fluid can circulate between a secondary channel of the evaporator and an external heat source.
  • CA 894 525 A describes a refrigeration device with a refrigeration machine, the evaporator of which is arranged above the condenser and in which the evaporator and condenser can be connected in a standstill phase of the compressor in such a way that liquid refrigerant flows from the evaporator to the condenser and at the same time refrigerant vapor rises from the condenser to the evaporator.
  • the object of the invention is to create a refrigeration device that enables even more energy-efficient defrosting.
  • the object is achieved by a refrigeration device with the features of claim 1.
  • a refrigeration device with the features of claim 1.
  • the condenser With the help of the thermosiphon, a large amount of heat can be transported to the evaporator in a short time, which is taken from the condenser serving as a heat reservoir and therefore does not affect the energy balance of the refrigeration device.
  • the condenser If the refrigeration machine was still in operation immediately before the start of the defrosting process, the condenser is significantly warmer than the more distant surroundings, and its high temperature enables rapid heat transfer to the evaporator. After the defrosting process, the condenser can be colder than the more distant surroundings, which in turn improves the efficiency of the refrigeration machine when it resumes operation after defrosting.
  • the cooling that the condenser experiences through the defrosting of the evaporator of the first storage chamber can, however, also be made immediately usable again during the defrosting to cool the second storage chamber.
  • a passage, hereinafter referred to as the first passage, between an inner area in thermal contact with the evaporator and an outer area of the thermosiphon in thermal contact with the heat reservoir should be able to be shut off by a valve in order to prevent heat transfer to the evaporator outside the defrosting phases To suppress refrigeration device.
  • a control unit is provided in order to estimate an amount of ice that has accumulated on the evaporator and to open the valve if the estimated amount of ice exceeds a limit value.
  • Such control units are known per se, but are conventionally mostly used to switch an electrical defrost heater instead of the valve.
  • the heating power that the thermosiphon can supply to the evaporator is heavily dependent on the temperature of the heat reservoir, so that the duration of a defrosting process can vary.
  • the control unit should therefore be equipped with a temperature sensor on the inner area of the thermosiphon or be connected to the evaporator and set up to close the valve when the temperature detected by the temperature sensor exceeds a limit value.
  • the first passage extends downward from a lower end of the inner region to the outer region.
  • a heat transfer medium that condenses in the inner area of the thermosiphon during defrosting and collects at the lower end of the inner area can reach the outer area driven by gravity and evaporate there again.
  • a second passage is preferably also provided between the inner and outer area, so that heat carrier vapor can return from the outer area to the inner area via a different passage than the one through which the liquid heat carrier flows. In this way, the flows between the inner and outer areas do not interfere with each other, and a high heat transfer rate can be achieved without the need for forced circulation of the heat transfer medium.
  • the second passage should run at least in sections from the outer area downwards to the inner area. If the first passage is blocked by the valve and the inner area is considerably colder than the outer area, a stable temperature stratification can be achieved in the passage, which minimizes the flow of heat into the storage chamber via the second passage.
  • the inner area of the thermosiphon preferably comprises a heat transfer line that runs through the evaporator itself.
  • the evaporator is a lamellar evaporator
  • such a heat transfer line can - in the same way as usually a refrigerant line - cross the lamellar evaporator.
  • a refrigerant line and the heat transfer line can run next to one another on this.
  • the evaporator can comprise a multi-channel tube, one channel of the multi-channel tube carrying the refrigerant of the refrigerating machine and another channel carrying the heat transfer medium of the thermosiphon.
  • the outer area of the thermosiphon can include a heat transfer line that runs through the condenser.
  • Fig. 1 is a schematic representation of the refrigeration device according to the invention.
  • a body 1 each surrounded by a thermal insulation layer 2, two compartments, here a freezer compartment 3 and a normal refrigerator compartment 4, are cut out.
  • Evaporators 5, 6 of the two compartments 3, 4 are connected to a compressor 8 via a common suction line 7.
  • a condenser 9 is connected to an output of the compressor 8.
  • a line 10 emanating from the condenser 9 branches off at a directional control valve 11 into two capillaries 12, 13, each of which leads back to one of the evaporators 5, 6.
  • thermosiphon 14 for defrosting this layer of ice comprises an inner area 15 inside the freezer compartment 3 and an outer area 16 outside the thermal insulation layer 2.
  • the inner area 15 is formed by a heat transfer line 17 which runs through the evaporator 5; the outer region 16 is formed by a heat transfer line 18 in the condenser 9.
  • the outer area 16 is at least partially lower than the inner area 15, so that refrigerant condensed in the evaporator 5, which converges at a lowest point 19 of the heat transfer line 17 in the evaporator 5, is driven from there solely by gravity via a first passage 20 through the Thermal insulation layer 2 can flow to the condenser 9, provided that a valve 21 arranged in the first passage 20 is open.
  • thermosiphon 14 enables heat to be transported to the evaporator 5 only as long as the valve 21 is open.
  • An electronic control unit 24 is used to control the valve 21, which is designed to measure the amount of ice on the basis of various criteria known per se, such as the running time of the compressor 8 since the last defrosting process, the frequency of door openings in the freezer compartment 3 since the last defrosting process, etc. To estimate the evaporator 5 and to open the valve 21 as soon as the estimated amount of ice exceeds a limit value.
  • a temperature sensor 25 is attached to the evaporator 5 adjacent to the lowest point 19. As soon as the temperature detected by this temperature sensor 25 rises above 0 ° C. in the course of a defrosting process, it can be assumed that the evaporator 5 is free of ice; then the control unit 24 closes the valve 21 again.
  • Fig. 2 shows a schematic section through the thermal insulation layer 2 of the refrigeration device with the evaporator 5 arranged on the side of the freezer compartment 3 and the condenser 9 exposed on the outside.
  • the passage 20 slopes down its entire length to the outer area 16 of the heat siphon 14, on the condenser 9 so that heat transfer medium which condenses in the inner area 15 can automatically flow off to the outer area 16 when the valve 21 is open.
  • the valve 21 is closed, condensed heat transfer medium can accumulate in the inner area 15 and in the passage 20 above the valve 21, but does not get into the outer area 16.
  • the inner and outer areas 15, 16 of the thermosiphon 14 can, as in FIG Fig. 2 indicated, in the form of hollow plates which are in intimate thermal contact with the evaporator 5 or the condenser 9 on one of their main surfaces.
  • a structure is preferred in which the regions 15, 16 of the heat siphon each form integral components of the evaporator 5 and the condenser 9, respectively.
  • a first example of such a structure is shown Fig. 3 using the example of a rollbond heat exchanger.
  • tubes are side by side Heat transfer line 17 and a line 27 for the refrigerant circulated by the compressor 8 are laid.
  • FIG. 4 A corresponding arrangement of heat transfer line 17 and refrigerant line 27 is shown Fig. 4
  • the lines 17, 27 together with the wires 28 connecting them here form a wire tube heat exchanger which can be used both as an evaporator 5 and as a condenser 9.
  • Fig. 5 shows a side view of a fin evaporator.
  • the refrigerant line 27 forms, in a manner known per se, an upper and a lower layer 29, 30 of straight sections 34 which cross the lamellae 31 vertically and run in the direction of view of the viewer and which alternate with one another on the side of the evaporator facing the viewer or, in dashed lines shown, on the side facing away from it protruding arches 32 are connected.
  • Another arch 33 protruding beyond the lamellae 31 establishes a row connection between the two layers 29, 30.
  • the heat transfer line 17 also forms an upper and a lower layer 35, 36, but, unlike the layers 29, 30, these lie exactly in one plane so that they are continuously sloping over their entire length. In this way, liquid heat transfer medium, irrespective of where it forms in layers 35, 36, can flow freely in heat transfer line 17 to the lowest point 19 of evaporator 5 and from there to outer area 16 of heat siphon 14.
  • Fig. 6 shows a fragment of a heat exchanger formed from multi-channel tube 37.
  • the multi-channel pipe 37 extruded from metal, in particular aluminum, has a band-shaped elongated cross section and can easily be bent in an orientation in which its main surfaces 38, 39 form the outer and inner sides of a bend.
  • the channels 40 of the multi-channel pipe 37 each alternately belong to the heat transfer line 17 and the refrigerant line 27 and thus enable extremely rapid heating of the evaporator during defrosting.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Defrosting Systems (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Claims (10)

  1. Appareil frigorifique comprenant une première chambre de stockage (3) entourée par une couche d'isolation thermique (2), une machine frigorifique qui comprend un évaporateur (5) réfrigérant la première chambre de stockage (3) et un compresseur (8) entraînant la circulation de fluide réfrigérant à travers l'évaporateur (5), et un thermosiphon (14) qui est en contact thermique avec l'évaporateur (5) et avec un réservoir thermique en dehors de la couche d'isolation thermique (2), dans lequel un premier passage (20) entre une partie intérieure (15) du thermosiphon (14), en contact avec l'évaporateur (5), et une partie extérieure (16) du thermosiphon (14), en contact thermique avec le réservoir thermique, peut être obturé au moyen d'une vanne (21), caractérisé en ce que le réservoir thermique est un condenseur (9) de la machine frigorifique, dans lequel la machine frigorifique comprend un deuxième évaporateur (6) destiné à réfrigérer une deuxième chambre de stockage (4), lequel peut être alimenté en fluide réfrigérant par le compresseur (7) pendant que la vanne (21) est ouverte, et dans lequel une unité de commande (24) est configurée pour évaluer une quantité de glace accumulée sur l'évaporateur et ouvrir la vanne (21) lorsque la quantité de glace évaluée dépasse une valeur limite.
  2. Appareil frigorifique selon la revendication 1, caractérisé en ce que l'unité de commande (24) est reliée à un capteur de température (25) sur la partie intérieure (15) du thermosiphon (14) ou sur l'évaporateur (5), et est configurée pour fermer la vanne (21) lorsque la température saisie par le capteur de température (25) dépasse une valeur limite.
  3. Appareil frigorifique selon la revendication 1 ou 2, caractérisé en ce que le premier passage (20) s'étend d'une extrémité inférieure de la partie intérieure (15) vers le bas en direction de la partie extérieure (16).
  4. Appareil frigorifique selon l'une quelconque des revendications 1 à 3, caractérisé par un deuxième passage (22) entre la partie intérieure et la partie extérieure (15, 16).
  5. Appareil frigorifique selon la revendication 4, caractérisé en ce que le deuxième passage (22) s'étend au moins par sections vers le bas, de la partie extérieure (16) vers la partie intérieure (15).
  6. Appareil frigorifique selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la partie intérieure (15) du thermosiphon (14) comprend une conduite de fluide caloporteur (17) qui s'étend à travers l'évaporateur (5).
  7. Appareil frigorifique selon la revendication 6, caractérisé en ce que l'évaporateur (5) est un évaporateur à lamelles et en ce que la conduite de fluide caloporteur (17) croise les lamelles (31) de l'évaporateur à lamelles.
  8. Appareil frigorifique selon la revendication 6, caractérisé en ce que l'évaporateur est un évaporateur à plaques dans lequel une conduite de fluide réfrigérant (27) et la conduite de fluide caloporteur (17) s'étendent côte à côte sur une plaque de base (26).
  9. Appareil frigorifique selon la revendication 6, caractérisé en ce que l'évaporateur (5) comprend un tube à canaux multiples (37), dans lequel un canal (40, 27) du tube à canaux multiples (37) conduit le fluide réfrigérant et un autre canal (40, 17) conduit un fluide caloporteur du thermosiphon (14).
  10. Appareil frigorifique selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie extérieure (16) du thermosiphon (14) comprend une conduite de fluide caloporteur (18) qui s'étend à travers le condenseur (9).
EP15801445.6A 2014-12-08 2015-11-27 Réfrigérateur no-frost Active EP3230664B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014225102.8A DE102014225102A1 (de) 2014-12-08 2014-12-08 No-Frost-Kältegerät
PCT/EP2015/077963 WO2016091621A1 (fr) 2014-12-08 2015-11-27 Appareil frigorifique antigivre

Publications (2)

Publication Number Publication Date
EP3230664A1 EP3230664A1 (fr) 2017-10-18
EP3230664B1 true EP3230664B1 (fr) 2021-07-07

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EP15801445.6A Active EP3230664B1 (fr) 2014-12-08 2015-11-27 Réfrigérateur no-frost

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EP (1) EP3230664B1 (fr)
CN (1) CN107003058A (fr)
DE (1) DE102014225102A1 (fr)
WO (1) WO2016091621A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3109572B1 (fr) * 2015-06-22 2019-05-01 Lg Electronics Inc. Réfrigérateur
EP3521735A1 (fr) * 2018-01-31 2019-08-07 Vestel Elektronik Sanayi ve Ticaret A.S. Appareil de réfrigération et procédé de dégivrage d'un appareil de réfrigération
CN110173945A (zh) * 2019-05-07 2019-08-27 湖北美的电冰箱有限公司 制冷设备
CN110173953A (zh) * 2019-05-07 2019-08-27 湖北美的电冰箱有限公司 制冷设备及其化霜控制方法

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CA894525A (en) * 1972-03-07 F. H. Bodcher Vilhelm Defrosting device for compression refrigerating machine
KR19990005704A (ko) * 1997-06-30 1999-01-25 배순훈 냉장고의 제상장치
JP2000121236A (ja) * 1998-10-20 2000-04-28 Matsushita Refrig Co Ltd 冷蔵庫
CN2390161Y (zh) * 1999-08-19 2000-08-02 广东科龙电器股份有限公司 热管式除霜电冰箱
KR100431348B1 (ko) * 2002-03-20 2004-05-12 삼성전자주식회사 냉장고
CN203100325U (zh) * 2012-07-11 2013-07-31 广州南洋理工职业学院 冰箱热油除霜系统
US9046287B2 (en) * 2013-03-15 2015-06-02 Whirlpool Corporation Specialty cooling features using extruded evaporator
CN203501611U (zh) * 2013-07-01 2014-03-26 福州富雪岛制冷设备有限公司 能除霜的冷却系统

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Also Published As

Publication number Publication date
WO2016091621A1 (fr) 2016-06-16
EP3230664A1 (fr) 2017-10-18
CN107003058A (zh) 2017-08-01
DE102014225102A1 (de) 2016-06-09

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