Classifications

• • 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
  • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
• • 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
  • F25D23/00—General constructional features
  • F25D23/06—Walls
  • F25D23/061—Walls with conduit means
• • 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
  • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. 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
  • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
  • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
  • F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
  • F28D7/085—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions
• • 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
  • F25B2339/022—Evaporators constructed from a pair of plates forming a space in which is located 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
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
  • F25D11/006—Self-contained movable devices, e.g. domestic refrigerators with cold storage accumulators

Definitions

• the present invention relates to a refrigeration device and an evaporator for a refrigeration device, in particular a so-called cold-wall evaporator.
• Such evaporators are usually represented by free-hanging or foamed roll bond or tube-plate systems.
• An object of the present invention is to provide a refrigeration device or an evaporator for a refrigeration device, which can be manufactured inexpensively and without high demands on the dimensional accuracy, in particular the evenness, of the evaporator, and which nevertheless have an intimate contact and a highly effective heat exchange with the Allow wall of a refrigerated goods container.
• an evaporator with a coolant channel guided between two side walls, in which at least one of the side walls, which is provided for contact with the wall of the refrigerated goods container, is formed from a flexible material or a refrigeration device equipped with such an evaporator ,
• Such an evaporator wall is able to adapt to the shape of the refrigerated goods container wall and to follow its course in intimate contact, even if the refrigerated goods container wall is not exactly flat.
• Such a flexible wall can be made from a plastic film, preferably from a weldable plastic material.
• a plastic material has a lower specific thermal conductivity than metals conventionally used for such an evaporator wall; however, since the film has no mechanical support function, it can be thinner than conventional metal walls and thus have a comparable or even higher heat transfer coefficient.
• the refrigerant channel inside the evaporator is expediently formed by a pipeline, and the evaporator contains a heat-transferring fluid in thermal contact with the pipeline.
• a fluid can perform convection movements during operation of the evaporator, as a result of which highly efficient heat transfer between the side wall and the coolant channel is possible even over greater distances.
• the two side walls of the evaporator can be in one piece and tightly connected at their common edge; this allows the use of different materials for the two walls, e.g. a thin-walled film without inherent rigidity for that side wall of the evaporator which is intended for contact with the wall of the refrigerated goods container, and a rigid, thick-walled film or a plate for the opposite wall.
• the production is simplified if the side walls are formed in one piece by a bag or hose.
• the evaporator is easy to manufacture by using a tube to first form it into a bag by closing an opening and then inserting the pipeline through the remaining opening of the bag and filling the fluid and then also sealing this opening.
• the side walls are expediently at a distance from them Edge connected locally so that they can not move far enough apart to hold all of the filled fluid in the lower area of the evaporator.
• local connections between the side walls are expediently in each case at one Inside formed by bends in the pipeline. A complementary local connection on the outside of the bend prevents the pipeline from slipping in the opposite direction.
• At least one elongated local connection extends across the side walls crossing the pipeline.
• Such an elongated connection is preferably oriented horizontally and forms a tight separation between two chambers for the fluid.
• the evaporator is divided into a plurality of sections lying vertically one above the other, between which no fluid exchange is possible. In this way it is excluded that the fluid can collect in a lower area of the evaporator and an upper area falls dry.
• An aqueous medium in particular a brine solution, is preferably used as the heat-transfer fluid.
• the brine can contain corrosion-preventing additives.
• a refrigeration device has an evaporator of the type described above in intimate contact with the wall of its refrigerated goods container. Contact can be ensured by gluing the evaporator to the wall.
• a freezing point below the operating temperature of the evaporator will be chosen for the fluid, so that convection of the fluid and thus an effective heat exchange is always possible.
• the freezing point of the fluid below a target temperature of the refrigerated goods container, but above a lowest possible temperature of the refrigerant, which generally depends on the nature of the refrigerant and the design of the refrigeration device of the refrigeration device.
• Such a selection of the freezing point leads to a throttling of the cooling capacity due to freezing and loss of the convection movement of the fluid when the target temperature of the refrigerated goods container is undershot, and can thus prevent unwanted hypothermia.
• a particularly practical application for this is a combination device with at least two refrigerated goods containers provided for different storage temperatures.
• the evaporators of both refrigerated goods containers can be supplied in series with the same coolant flow, and as soon as the target temperature of the warmer refrigerated goods container is undershot and the fluid in its evaporator freezes, its heat transfer efficiency decreases, so that the available cooling capacity essentially benefits the refrigerated goods container with the lower storage temperature.
• FIG. 1 shows a front view of an evaporator according to the invention in a first embodiment
• FIG. 2 shows a section through the evaporator from FIG. 1 along the line II-II from FIG. 1;
• FIG. 3 shows a second embodiment of the evaporator in a front view analogous to FIG. 1;
• FIG. 4 shows a section through the evaporator from FIG. 3 along the line IV-IV from FIG. 3;
• FIG. 5 shows a detail of an evaporator according to a modification of FIG. 3
• FIG. 6 is a front view of a third embodiment of the evaporator
• FIG. 7 shows a horizontal section through a refrigeration device equipped with an evaporator according to the invention.
• Fig. 8 is a partial vertical section through a refrigerator with two refrigerated goods containers, which are equipped with evaporators according to the invention.
• Fig. 1 shows a front view of an evaporator according to a first embodiment of the invention.
• Fig. 2 shows the same evaporator mounted on a wall of the refrigerated goods container of a refrigerator.
• the evaporator 1 is essentially constructed from two flexible foils 2, 3 made of a weldable plastic material, between which a rigid pipeline 4, preferably made of highly heat-conducting metal, is arranged for a refrigerant.
• the pipeline has a meandering or zigzag-like course, with straight vertical sections connected by 180 ° bends.
• the foils are tightly connected to one another by a circumferential weld at their edge 5.
• Supply and discharge connections 6, 7 for the refrigerant are led out in an upper section of the edge 5 between the two foils 2, 3.
• Three elongated local connections 8 in the form of weld seams extend from one side to the other over the entire width of the evaporator and cross the pipeline 4 several times. They divide the surface of the evaporator into four closely delimited sections 9 of essentially the same size contain approximately equal amounts of a brine serving as heat exchange fluid. In the area of the elongated connections, the foils 2, 3 adhere firmly to the pipeline 4, so that slipping of the foils 2, 3 in relation to the pipeline 4, which could lead to obstructions when installing the evaporator, is largely ruled out.
• elongated local connections can also be provided.
• one of the two foils, foil 3 lies essentially over the entire surface of a rear wall 10 of the refrigerated goods container of a refrigeration device.
• the film 3 is expediently glued to the rear wall 10. This can be accomplished in a simple manner by setting up the refrigerated goods container with a horizontally oriented rear wall 10, coating the rear wall and / or the film 3 with adhesive, and placing the brine-filled evaporator 1 on the rear wall 10. Since the film 3 is thin-walled and flexible, the weight of the evaporator 1 alone is sufficient to ensure that the film 3 at least in the area of the sections 9 clings tightly to the rear wall 10 and thus forms an intimate contact with the latter, even if the Back wall 10 is not exactly flat.
• FIG. 3 shows a modification of the evaporator from FIG. 1, in which the connections 8 are not designed as a continuous weld seam, but rather as a multiplicity of spot welds which allow an exchange of brine between the sections 9 'delimited by the connections 8' ,
• the height h of the sections is not constant, as in the embodiment in FIG. 1, but takes it from below towards the top and is selected such that essentially the same thickness d of the sections results in the weight of the brine in all sections 9 ', as shown in FIG. 4.
• FIG. 5 shows a detail of a modified version of the evaporator from FIG. 3.
• a filler neck 11 for the brine is formed from two extensions of the foils 2, 3 that are partially welded together.
• This variant allows the foils 2, 3 to be welded to one another in the region of the edge 5 and the connections 8 ′, and only then, preferably after the evaporator has been installed on the rear wall 10, to be filled in with the brine.
• This has the advantage that the evaporator, as long as it has not yet been installed, has only a low weight, which is for the most part the weight of the pipeline 4. There is therefore no danger that improper handling will lead to deformation of the pipeline 4 before installation.
• FIG. 6 shows a third embodiment of the evaporator. It differs from the ones described above on the one hand in the orientation of the pipeline 4, which here is predominantly composed of horizontal straight sections 13 connected by 180 ° bends 12.
• Elongated connections 9 "between the foils 2, 3 extend in the vertical direction and each consist of a plurality of individual welding spots which are arranged above and below each horizontal section in order to prevent the foils 2, 3 from slipping in the vertical direction.
• Further local Connections 14 are each provided on the inside of the bends 12 to prevent the foils from slipping sideways to the outside, complementary connections 15 are located opposite them on the outside of the bends 12. These connections 14, 15 are also designed as welding points or seams
• These connections 8, 14, 15 offer a high degree of security against slipping of the foils 2, 3 against the pipeline 4 even when the evaporator is filled with brine.
• Fig. 7 shows a horizontal section through a refrigerator according to the invention.
• Its box-shaped housing essentially consists of an outer housing wall 15 made of sheet metal, and a refrigerated goods container 16 arranged therein, which is, for example, drawn in one piece from plastic, the housing wall 15 and the refrigerated goods container 16 delimiting a space 17 between them.
• the evaporator 1 is arranged in intimate contact with the rear wall 10 of the refrigerated goods container 16. After mounting the evaporator 1 on the rear wall 10 and joining together the outer housing wall 15 and the refrigerated goods container 16, the intermediate space 17 has been filled with a heat-insulating foam material 18 which also extends over the entire rear side of the evaporator 1.
• the pipes of both evaporators 1, 1 ' are connected in series so that the same coolant flow flows through them.
• the composition of the brine is different in the evaporators 1, 1 ', specifically for the evaporator 1' of the cooling compartment 21 so that its freezing point is at most slightly below the freezing point of pure water, the freezing point of the brine in the evaporator 1 is in contrast considerably deeper.

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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)
• Devices That Are Associated With Refrigeration Equipment (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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ID=7686955

Family Applications (1)

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Cited By (1)

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Citations (7)

• 2001
  • 2001-06-01 DE DE2001126818 patent/DE10126818A1/de not_active Withdrawn
• 2002
  • 2002-05-27 WO PCT/EP2002/005804 patent/WO2002099344A1/de active Application Filing
  • 2002-05-27 PL PL367236A patent/PL199573B1/pl not_active IP Right Cessation
  • 2002-05-27 CN CN 02810923 patent/CN1289883C/zh not_active Expired - Fee Related
  • 2002-05-27 EP EP02754587A patent/EP1397624A1/de not_active Withdrawn

Patent Citations (7)

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