EP2158434A1 - Condenseur de paroi arrière de réfrigérateurs de ménage - Google Patents

Condenseur de paroi arrière de réfrigérateurs de ménage

Info

Publication number
EP2158434A1
EP2158434A1 EP08758094A EP08758094A EP2158434A1 EP 2158434 A1 EP2158434 A1 EP 2158434A1 EP 08758094 A EP08758094 A EP 08758094A EP 08758094 A EP08758094 A EP 08758094A EP 2158434 A1 EP2158434 A1 EP 2158434A1
Authority
EP
European Patent Office
Prior art keywords
condenser according
condenser
line
lines
refrigerant
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.)
Withdrawn
Application number
EP08758094A
Other languages
German (de)
English (en)
Inventor
Olaf Hempel
Eberhard Wobst
Carsten Heinrich
Markus Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institut fuer Luft und Kaeltetechnik Gemeinnuetzige GmbH
Original Assignee
Institut fuer Luft und Kaeltetechnik Gemeinnuetzige GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE200710023696 external-priority patent/DE102007023696B4/de
Priority claimed from DE200710023673 external-priority patent/DE102007023673B4/de
Priority claimed from DE102007023672A external-priority patent/DE102007023672A1/de
Application filed by Institut fuer Luft und Kaeltetechnik Gemeinnuetzige GmbH filed Critical Institut fuer Luft und Kaeltetechnik Gemeinnuetzige GmbH
Publication of EP2158434A1 publication Critical patent/EP2158434A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F25B39/00—Evaporators; Condensers
    • F25B39/04—Condensers
    • 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
    • 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
    • F28D1/053—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 straight
    • F28D1/0535—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 straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
    • 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F28F13/182—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing especially adapted for evaporator or condenser surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2240/00—Spacing means

Definitions

  • the invention relates to a condenser for refrigeration appliances with free convection, in particular household refrigerators such as refrigerators, freezers or fridge freezers, which is simple and inexpensive to produce and has a high efficiency.
  • refrigerators that operate on other cooling principles, such.
  • absorber cooling units which are characterized by a low noise, or thermoelectric cooling units that allow compact designs, in addition to these specific advantages, however, have the disadvantage of a much higher energy consumption, they find only in niche application.
  • a compressor compresses a gaseous refrigerant that heats up.
  • the refrigerant is passed through a condenser located on the outside of the unit.
  • the condenser releases heat to the environment and condenses. Thereafter, the refrigerant flows to reduce the pressure via a throttle, such.
  • a throttle such as an expansion valve or capillary tube, located in the inside of the refrigerator evaporator. In this the refrigerant evaporates and cools down strongly.
  • the evaporator allows for heat exchange, thereby cooling the interior of the refrigerator.
  • the condenser used for domestic refrigerators usually consist of a meandering curved pipe to which wire ribs are welded for better heat dissipation. To the heat transfer by heat radiation on To increase, the pipe and the wire ribs are painted black. The condenser is located mainly on the back of the refrigerator.
  • EP 0 125 642 A2 proposes a refrigerator with a rear wall condenser which merely consists of a meander-shaped curved pipeline.
  • the straight pipe sections have an elliptical cross section, the curved one circular. Since tubes with an elliptical cross-section have a larger surface compared to tubes with a circular cross-section, the welding of wires or sheets is dispensed with. Although this will However, the efficiency of the heat exchange is not improved.
  • EP 0 843 138 A1 describes a back wall condenser for domestic refrigerators, which shows a meander-shaped bent pipe which is clamped between two sheets. One of the two plates forms with a third plate a container which is filled with a liquid of high heat capacity.
  • CN 1616904 A discloses a back-wall condenser consisting of two horizontally superposed pipes connected by means of many pipes connected in parallel and vertically arranged.
  • the vertical tubes have a diameter of 1 to 3 mm, that is, they are comparatively thin.
  • the refrigerant is distributed to the vertical tubes, in the underlying tube this is collected again.
  • a sheet may be attached to the pipes.
  • many thin tubes or microchannel lines By using many thin tubes or microchannel lines, a large surface area and thus a good heat exchange can be achieved.
  • the use of thin tubes or micro-channel lines makes, in order to avoid excessive pressure losses, a parallel circuit necessary, which increases the production cost. It is also disadvantageous that the air flow runs continuously along the tubes or microchannel lines, so that comparatively thick, laminar boundary layers are built up there, which prevent optimal heat dissipation.
  • condenser for forced convection refrigerators are known in which extruded aluminum profile lines are used, which are band-shaped and have a plurality of parallel channels.
  • EP 1 557 622 A2 US 2006/0144076 A1 and DE 10 2004 024 825 A1 describe condenser for forced convection with headers and condenser without headers corresponding in US 2005/0076506 A1 and JP 06317363.
  • the object of the invention is to eliminate the disadvantages of the prior art.
  • a condenser is to be created for household refrigerators with free convection, which has a high efficiency and is simple and inexpensive to produce.
  • the condenser for refrigeration appliances with free convection at least one line for the refrigerant, which is formed like a strip whose width is at least twice their thickness and in which there are at least two separate, side by side extending channels.
  • the line runs edgewise and for the most part almost parallel to the lower edge of the refrigeration device.
  • the flow of the individual lines through the air takes place by free convection, ie from below or above.
  • the air hits the narrow edges of the lines.
  • the upper edge of the preceding is offset parallel to the lower edge of the subsequent line section in the flow direction.
  • a fresh start of the air flow takes place at each line section and the insulating laminar boundary layer at the line sections is consequently kept thin.
  • the efficiency of the condenser can be increased by up to 15%.
  • the parallel displacement between the upper and lower edges is achieved in that either the line sections are arranged offset in parallel in the flow direction or these are tilted. From a flow point of view, only tilt angles between 0 and 45 ° make sense. It is also conceivable to simultaneously displace and tilt the line sections; however, this does not achieve any particular advantage.
  • the condenser in which this is characterized in that it has a particularly small flow resistance on the refrigerant side, the condenser has a vertically arranged one
  • the two manifolds may have a round, namely circular, semi-circular, elliptical and oval, or angular, namely triangular, square or rectangular, flow cross-section.
  • a distribution device can be integrated in the collecting tube at the entrance.
  • the headers are connected by a plurality of horizontally located and at different heights parallel to each other arranged lines for the refrigerant mainly in parallel. Through installations in the headers but also a series connection of all lines or a series connection of several parallel lines can be generated, so that the refrigerant flows through the condenser meandering from top to bottom.
  • the lines run straight between the headers or are bent horizontally wave or meandering.
  • a plurality of lines are arranged side by side, usually parallel spaced, on a horizontal plane. It is advantageous to install spacers between these lines, for example in the form of sheets. This creates a secondary heat exchanger surface at the same time.
  • the line for the refrigerant bent in at least one flat-shaped layer runs spiral, helical, helical, helical or three-dimensional meandering.
  • no headers are used.
  • the preferred three-dimensional meandering arrangement of the conduit means that it is meandering in lateral view and also has a spatial depth.
  • Such a conduit thus typically has a helical or helical course in space, but does not have the otherwise usual round or elliptical cross-sectional areas in the case of screws / helices, but has a cross-section (in plan view) which is either in the form of an oblong Rectangles with rounded corners or the shape of the outline of an elongated "eight" has.
  • the condenser For the common domestic refrigerators, it is sufficient in this embodiment to use for the condenser only one line, which is preferably bent three-dimensional meandering. Such a condenser is particularly easy to manufacture and ensures a sufficiently good heat exchange between refrigerant and ambient air. However, arrangements are also conceivable for specific applications, which consist of a plurality of separate lines, possibly spaced apart from one another, or of lines arranged in a plurality of superimposed layers.
  • the pipes are usually made of aluminum, since aluminum has a good thermal conductivity, is inexpensive and can be bent well. By providing the pipes with a coating which has a high emission coefficient, an increase in the heat output by thermal radiation to the ambient air is achieved.
  • compact condensers for forced convection refrigerating appliances could also be produced from extruded profile tubes which are bent in such a way that several layers are arranged one behind the other in the flow direction, whereby line sections one behind the other are staggered relative to one another.
  • Fig. 4 a condenser (without manifolds) with three-dimensional meandering curved line.
  • the line 1 according to FIG. 1 consists of extruded aluminum profile tubes, with a width of 2.54 cm and a thickness of 2.1 mm.
  • the sides 5 of the profile tubes 1 are rounded, z. B. with a radius of 1 mm.
  • profiles 1 are covered with black lacquer.
  • the profiles 1 are standardized and therefore inexpensive.
  • the line 1 has thirteen channels 3, 4, which serve for the passage of the refrigerant 2.
  • the channels 3 have a square cross section with rounded corners, wherein the edge length is approximately 1, 5 mm.
  • the two outer channels 4 are approximately rectangular, but the outwardly facing side is rounded.
  • the channels 4 are in Example 1, 5 mm long and 0.5 mm wide.
  • Fig. 2 in the condenser with collecting tubes 9, these are connected by a plurality of pairs of lines 1 arranged in parallel one above the other, the pairs each extending on a horizontal plane and being spaced apart by the spacers 8 (see Fig. 3).
  • the arranged on adjacent levels pairs of lines 1 are each offset in the flow direction to each other (not shown).
  • the line 1 is three-dimensional meandering bent.
  • the bending radii are approx. 1, 5 cm.
  • the parallel lines 1 each have a distance of about 3 to 8 cm, that is, they are relatively dense arranged (see Fig. 4). Due to the large number of parallel fenden channels a large flow cross-section for the refrigerant is provided so that even with a large length of the line 1, the pressure loss of the refrigerant is kept low.
  • each of the line sections which form superimposed turns of the meander, offset in the flow direction to each other.
  • the condenser is particularly simple and inexpensive to produce, since no welding of components is necessary.
  • a large surface of the condenser is achieved by the flat, band-like shape of the lines 1 and their dense, parallel or meandering arrangement. Due to the staggered arrangement of the profile tubes 1 takes place on the long sides of all profiles, each a restart of the air flow. As a result, the insulating, laminar boundary layer is kept thin there and ensures effective heat transfer.
  • the surface of the condenser can be further increased with the same tube length by profile tubes 1 are used with rib structure.
  • the entire surface of the condenser is set in the operation of the refrigerator in a very short time at the same temperature.
  • the condensers are simple and inexpensive to produce, since the extruded aluminum profile tubes cost standard components are used. The cleaning of the condenser is easily possible, whereby their constancy of performance can be ensured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

L'invention concerne un condenseur pour appareils de réfrigération à convection libre, notamment pour réfrigérateurs de ménage, ce condenseur comportant au moins un conduit (1) en forme de bande dont la largeur représente au moins le double de son épaisseur. Ce conduit comprend au moins deux canaux (3,4) séparés adjacents et il s'étend, lors d'une utilisation conforme à sa destination, sur chant et en grande partie pratiquement parallèlement au bord inférieur du réfrigérateur. Sur les segments de conduit disposés les uns derrière les autres dans le sens de l'écoulement, le bord supérieur du segment de conduit précédent est décalé en parallèle au bord inférieur du segment de conduit suivant, dans le sens de l'écoulement. L'utilisation de tubes profilés en aluminium extrudé du commerce permet de fabriquer un condenseur peu onéreux présentant d'excellentes propriétés d'échange thermique.
EP08758094A 2007-05-22 2008-05-20 Condenseur de paroi arrière de réfrigérateurs de ménage Withdrawn EP2158434A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE200710023696 DE102007023696B4 (de) 2007-05-22 2007-05-22 Verflüssiger für Haushaltskältegeräte
DE200710023673 DE102007023673B4 (de) 2007-05-22 2007-05-22 Rückwandverflüssiger für Haushaltskältegeräte
DE102007023672A DE102007023672A1 (de) 2007-05-22 2007-05-22 Kompaktverflüssiger für Haushaltskältegeräte mit erzwungener Konvektion
PCT/DE2008/000853 WO2008141626A1 (fr) 2007-05-22 2008-05-20 Condenseur de paroi arrière de réfrigérateurs de ménage

Publications (1)

Publication Number Publication Date
EP2158434A1 true EP2158434A1 (fr) 2010-03-03

Family

ID=39665973

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08758094A Withdrawn EP2158434A1 (fr) 2007-05-22 2008-05-20 Condenseur de paroi arrière de réfrigérateurs de ménage

Country Status (5)

Country Link
US (1) US20100206531A1 (fr)
EP (1) EP2158434A1 (fr)
KR (1) KR101468912B1 (fr)
CN (1) CN101680690B (fr)
WO (1) WO2008141626A1 (fr)

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ES2385767B1 (es) * 2009-04-15 2013-06-17 Bsh Electrodomesticos España S.A. Licuador así como también bomba de calor y aparato doméstico con un licuador de tal tipo.
CN103968699B (zh) * 2014-05-21 2016-08-17 合肥华凌股份有限公司 换热管、蒸发器组件、冷凝器组件和制冷设备
DE102017201081A1 (de) * 2016-01-25 2017-07-27 Hanon Systems Rohr für einen Wärmetauscher
CN112710107B (zh) * 2020-12-07 2022-06-14 佛山市盈特金属制品有限公司 一种冷凝器

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Also Published As

Publication number Publication date
WO2008141626A1 (fr) 2008-11-27
KR101468912B1 (ko) 2014-12-04
CN101680690A (zh) 2010-03-24
KR20100032388A (ko) 2010-03-25
US20100206531A1 (en) 2010-08-19
CN101680690B (zh) 2014-05-28

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