Classifications

• • 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
  • F25B39/00—Evaporators; Condensers
  • F25B39/02—Evaporators
• • 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
• • 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
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2275/00—Fastening; Joining
  • F28F2275/02—Fastening; Joining by using bonding materials; by embedding elements in particular materials
  • F28F2275/025—Fastening; Joining by using bonding materials; by embedding elements in particular materials by using adhesives

Definitions

• the present invention relates to a heat exchanger, such as an evaporator, a condenser or the like, for a refrigeration device with a circuit board, a pipeline arranged in heat-conducting contact with the circuit board for a refrigerant and a holding material layer adhering to the circuit board and the pipeline, and a Method of manufacturing such a heat exchanger.
• a heat exchanger such as an evaporator, a condenser or the like
• a heat exchanger of this type and a method for its production are known from DE 109 38 773 A1.
• a meandering bent pipe is held against a circuit board, and the spaces between the meanders of the pipe are filled with a shaving agent.
• This holding means can be an expanded polyurethane foam or castable thermosetting plastics.
• Such holding means are expensive and the crosslinking that takes place during their curing or foaming makes their recovery and reuse difficult when such a heat exchanger is to be recycled.
• the object of the present invention is to create an inexpensive, recycling-friendly heat exchanger for a refrigerator and a method for its production.
• the object is achieved by a heat exchanger with the features of claim 1 and a method with the features of claim 13.
• bitumen composition as a holding material layer has the advantage, on the one hand, that such materials are available inexpensively, and, on the other hand, they are recycling-friendly, since after the dismantling of such a heat exchanger into its components, the bitumen material obtained without significant processing and without loss of quality for the production of a new heat exchanger or other purposes.
• the use of the bitumen composition after it has cooled ensures intimate contact of the pipeline with the carrier board, which improves the thermal efficiency of the heat exchanger.
• the mass of bitumen together Settling also has a heat or cold storage effect, which in the case of an evaporator serves to reduce the energy consumption of a refrigerator.
• connection between the carrier board and the pipeline achieved by the bitumen composition is mechanically very stressable and thus the heat exchanger is very dimensionally stable in handling in the manufacturing process of a large series production.
• bitumen composition Due to the conformability of the bitumen composition mentioned, it follows the pipeline and the carrier board with precise contours, as a result of which no moisture can diffuse between the pipeline and the carrier board, so that a risk of corrosion or the risk of ice formation leading to detachment of the pipeline from the carrier board is avoided.
• the pipeline can have a flattened cross section with the widespread side facing the circuit board in order to ensure a flat contact between the pipeline and the circuit board.
• the flat contact ensures heat-conducting contact between the pipeline and the circuit board even under unfavorable production conditions.
• an adhesive layer can preferably be provided which connects the holding material layer to the circuit board at least locally.
• This adhesive layer preferably consists of a heat-activatable adhesive. This simplifies the manufacture of the heat exchanger, since the adhesive layer can be attached unprotected to a plate made of the bitumen composition used to form the holding material layer, and its effectiveness is gained by melting when the holding material layer is heated.
• bitumen composition can contain between about 50 and 80% filler.
• the filler which can be a single material or a material mixture, can be selected, for example, from the point of view of minimizing costs, improving the thermal conductivity or optimizing the heat storage capacity of the holding material layer.
• a high heat storage capacity means that in a refrigeration device in which the evaporator according to the invention is installed, the compressor must run for a long time until a temperature sensor attached to the evaporator detects that the temperature falls below a lower limit at which the evaporator is switched off.
• Preferred fillers are crushed rock or iron.
• the protective material layer can be provided with a lacquer layer on its side facing away from the circuit board for protection.
• the holding material layer expediently has an average thickness in the range between 0.5 to 2 mm, preferably between 1.0 and 1.5 mm.
• a heat exchanger of the type described above is possible in a simple manner by forming a stack comprising a circuit board, a pipe for a refrigerant and a plate made of a bitumen composition, and then heating the film and pressing the stack.
• Figure 1 is a perspective view of an evaporator as an example of a heat exchanger according to the invention.
• FIG. 2 shows a partial section through the evaporator from FIG. 1;
• FIG. 3 steps of a method for manufacturing the evaporator.
• the evaporator shown in FIG. 1 in a perspective view is made up of a flat circuit board 1 made of aluminum sheet, on which a refrigerant line 2 made of a tube also made of aluminum is arranged in a meandering manner.
• the circuit board 1 and the refrigerant line 2 are covered by a holding material layer 3 made of a bitumen composition.
• the bitumen composition consists of approx. 25% by weight of polymer-modified bitumen, 3% by weight of a plastic and approx. 72% by weight of rock powder as filler.
• the proportion of the rock can be 50 to 80% by weight.
• Dense natural stone which is suitable as a starting material for the production of such rock powder, typically has a heat storage number S of approximately 700 Wh / m 3 K, in contrast to a value S »515 Wh / m 3 K for bitumen.
• the heat storage number of the holding material layer with 72% by weight of rock powder (corresponding to a volume fraction of approx. 50%) can be calculated at approx. 610 Wh / m 3 K.
• the heat storage capacity of this holding material layer is therefore almost 20% higher than that of a holding material layer of only the same thickness consisting of bitumen, and at the same time the material costs of the layer containing rock meal are lower.
• the refrigerant line 2 does not have an exactly round, but rather a flattened, rather elliptical cross-section, as a result of which the refrigerant line 2 and the circuit board 1 touch at least approximately flatly.
• the holding material layer 3 extends into gussets 4, which are located on both sides of the contact zone between the refrigerant line 2 and the plate 1.
• the massive shark Tematerial Mrs 3 ensures better heat transfer between the circuit board 1 and the refrigerant line 2 than would be possible with conventional use of a polyurethane foam as a holding material.
• the flattened shape of the refrigerant line 2 results in a smaller thickness of the holding material layer 3 in the gussets 4 than would be the case with a round line 2. This is also favorable for an efficient heat exchange between the circuit board 1 and the refrigerant line 2.
• a layer 5 made of a hot glue which, because of its much smaller thickness compared to the circuit board 1 and the holding material layer 3, can only be seen as a line in the figure.
• FIG. 3 Individual steps in the manufacture of the evaporator according to the invention are shown in FIG. 3.
• a stack is formed, the layers of which consist of the bitumen composition in each case through the circuit board 1, the refrigerant line 2 and a 1.2 mm thick plate 6.
• the adhesive layer 5 is located on the underside of the plate 6 facing the circuit board 1 and the refrigerant line 2. Since the adhesive of the layer 5 does not adhere when the plate is cold, the plate 6 together with the layer 5 can be conveniently prefabricated and handled; Measures to protect the adhesive power for the time between the manufacture and use of the plate 6 are not necessary.
• the refrigerant line 2 does not yet have to lie on the circuit board 1 over its entire length; a slight ripple of the refrigerant line 2 perpendicular to the surface of the circuit board 1, as shown in FIG. 3A, is permissible.
• a stamp 7 is pressed against the top of the plate 6.
• the plate 6 is cold and therefore stiff; the pressing force of the plunger 7 causes the refrigerant line 2 to be pressed against the board 1 over its entire length.
• the plunger 7 is provided with channels 9 on its underside facing the plate 6, the course of which corresponds to that of the refrigerant line 2.
• the stamp 7 made of elastomeric plastic such. B. silicone with a hardness of z. B. 20 Shore A and a material thickness of 20 mm.
• a stamp made of elastomeric plastic with an adapted shear hardness that does not lead to damage to the refrigerant line there is no need to insert the channel course of the refrigerant line on the underside of the stamp
• bitumen of the plate 6 flowable, and the plate 6 is pressed against the circuit board 1 in the spaces 8 between adjacent sections of the refrigerant line 2.
• the toughness of the bitumen composition is adjusted such that it becomes fluid enough to penetrate the gusset 4 between the circuit board 1 and the refrigerant line 2, but is still tough enough to allow any local lifting of parts of the refrigerant line 2 from the circuit board to prevent.
• the channels 9 of the plunger 7 can also be provided locally with projections (not shown) which are pressed through the plate 6 when it is heated and with the refrigerant line 2 come into direct contact to keep them pressed against the circuit board 1.
• the melting point of the hot-melt adhesive of the adhesive layer 5 is selected such that it melts during the heating and shaping of the plate 6 and then, after cooling, firmly connects the again solidified holding material layer 3 to the circuit board 1 and the refrigerant line 2.
• the adhesive layer 5 can extend over the entire underside of the plate 6 or only over parts thereof.
• a lacquer layer in particular shellac lacquer, can be applied to seal the exposed surface of the holding material layer 3.
• bitumen composition can be recovered in a simple manner by recycling the evaporator by deforming the evaporator in the cold
• Condition brittle holding material layer 3 is blasted off in pieces or by the connection between the evaporator being cooled strongly, for example with the aid of dry ice. see holding material layer 3 and refrigerant line 2 or circuit board 1 is broken.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Geometry (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Laminated Bodies (AREA)
• Adhesives Or Adhesive Processes (AREA)

Applications Claiming Priority (5)

Publications (1)

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Family Applications (1)

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• 2003
  • 2003-04-25 BR BR0309563-0A patent/BR0309563A/pt not_active IP Right Cessation
  • 2003-04-25 PL PL371433A patent/PL205439B1/pl not_active IP Right Cessation
  • 2003-04-25 AU AU2003222840A patent/AU2003222840A1/en not_active Abandoned
  • 2003-04-25 RU RU2004130490/06A patent/RU2317501C2/ru not_active IP Right Cessation
  • 2003-04-25 CN CNB038094568A patent/CN1309998C/zh not_active Expired - Fee Related
  • 2003-04-25 WO PCT/EP2003/004337 patent/WO2003091636A1/de not_active Application Discontinuation
  • 2003-04-25 EP EP03718791A patent/EP1502059A1/de not_active Withdrawn
• 2004
  • 2004-10-26 US US10/973,694 patent/US7222662B2/en not_active Expired - Fee Related

Non-Patent Citations (1)

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