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EP2593727A2 - Système d'évaporateur à canaux multiples - Google Patents

Système d'évaporateur à canaux multiples

Info

Publication number
EP2593727A2
EP2593727A2 EP12723104.1A EP12723104A EP2593727A2 EP 2593727 A2 EP2593727 A2 EP 2593727A2 EP 12723104 A EP12723104 A EP 12723104A EP 2593727 A2 EP2593727 A2 EP 2593727A2
Authority
EP
European Patent Office
Prior art keywords
channel evaporator
evaporator
channels
channel
cover
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Withdrawn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
EP12723104.1A
Other languages
German (de)
English (en)
Inventor
Günther EBERHARD
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.)
Liebherr Hausgeraete Ochsenhausen GmbH
Bundy Refreigeration GmbH
Original Assignee
Liebherr Hausgeraete Ochsenhausen GmbH
Bundy Refreigeration 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 DE201120109995 external-priority patent/DE202011109995U1/de
Application filed by Liebherr Hausgeraete Ochsenhausen GmbH, Bundy Refreigeration GmbH filed Critical Liebherr Hausgeraete Ochsenhausen GmbH
Publication of EP2593727A2 publication Critical patent/EP2593727A2/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/067—Evaporator fan units
    • 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
    • F28D1/0233—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 air flow channels
    • F28D1/024—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 air flow channels with an air driving 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
    • F28D1/0471—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 having a non-circular cross-section
    • 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
    • F28D1/0475—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 having a single U-bend
    • F28D1/0476—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 having a single U-bend the conduits having a non-circular cross-section
    • 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
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/01—Geometry problems, e.g. for reducing size
    • 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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/065—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return
    • F25D2317/0655—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the air return through the top
    • 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
    • F28D2001/0253—Particular components
    • F28D2001/026—Cores
    • F28D2001/0273—Cores having special shape, e.g. curved, annular

Definitions

  • the present invention relates to a multi-channel evaporator system with at least one multi-channel evaporator having a plurality of channels, which are flowed through during operation of the multi-channel evaporator of refrigerant.
  • Cooling and / or freezing appliances known from the prior art generally have one or more refrigerant circuits, which comprise at least one evaporator, which is flowed through by refrigerant during operation of the compressor and due to the evaporation of the refrigerant extracts heat from the compartment to be cooled ,
  • the evaporators are known in numerous different embodiments.
  • One possible embodiment is multichannel evaporators or microchannel evaporators which, compared to other types of evaporators, have smaller channels for the passage of refrigerant.
  • the channels of such multi-channel evaporators may be in the mm range or below. They have a comparatively large surface, with which the refrigerant comes into contact.
  • no-frost refrigeration appliances is in constant growth, which is due to an increase in convenience for the user of the appliance.
  • no-frost evaporator or no-frost devices are sometimes associated with disadvantages in which it is the large volume, the non-uniform flow of the tube register and the associated non-uniform frosting of the evaporator tubes, the sometimes poor thermal contact between the fins and the pipe register, which can be very high expenses for the installation of an electric evaporator heater, the energy consumption for the operation of the defrost heater, as well as in the sometimes not optimal energy efficiency.
  • the present invention is therefore based on the object to provide a multi-channel evaporator system or a multi-channel evaporator, with which these aforementioned disadvantages can be avoided.
  • a multi-channel evaporator system having the features of claim 1. Thereafter, it is provided that the multi-channel evaporator is at least partially curved and that at least one fan is provided, which is arranged such that the fan promotes air even or exclusively in the radial direction over the curved executed multi-channel evaporator.
  • the evaporator may thus be a radial heat exchanger, which has at least one centrally, preferably centrally arranged blower, which is surrounded at least partially by the multichannel evaporator and that in operation delivers the conveyed air in such a way that the ducts or pipes of the Multi-channel evaporator are swept by air, wherein at least one direction component of the air is in the radial direction of the plurality of channels of the evaporator. There is thus no exclusively tangential flow.
  • the multichannel evaporator system it is conceivable for the multichannel evaporator system to have at least one central blower, that is to say a blower arranged in the middle of the evaporator tube, which has a suction side and having a pressure side and that the multi-channel evaporator extends around the fan and / or around the suction side and / or around the pressure side, the multi-channel evaporator is fully or only in a partial area around the fan or the suction side and / or the pressure side can extend.
  • a central blower that is to say a blower arranged in the middle of the evaporator tube, which has a suction side and having a pressure side and that the multi-channel evaporator extends around the fan and / or around the suction side and / or around the pressure side, the multi-channel evaporator is fully or only in a partial area around the fan or the suction side and / or the pressure side can extend.
  • the multichannel evaporator may include one or more tubes, preferably flat tubes, in which the plurality of channels are and which are curved so as to extend partially or completely around the fan.
  • the tubes or the flat tubes may in turn have a plane or curved surface.
  • the present invention further relates to a multi-channel evaporator having a plurality of channels, which are flowed through during operation of the multi-channel evaporator of refrigerant, wherein the multi-channel evaporator is at least partially curved and has two or more superimposed layers of channels between which at least one gap is provided for the passage of air, wherein the two or more superimposed layers are formed as separate evaporator sections or form components of a common evaporator section.
  • the multi-channel evaporator is at least partially curved and has two or more superimposed layers of channels between which at least one gap is provided for the passage of air, wherein the two or more superimposed layers are formed as separate evaporator sections or form components of a common evaporator section.
  • the plurality of channels is arranged in a flat tube and this flat tube extends perpendicular to the central axis of the multi-channel evaporator.
  • the multi-channel evaporator (hereinafter referred to as "evaporator”) may thus have a central axis in which preferably the at least one fan is located and which forms the longitudinal axis of the evaporator. It is bar that or preferably radially curved flat tubes extend at an angle perpendicular to this central axis.
  • the angle between the central axis of the multichannel evaporator and the flat tube is> 45 ° and particularly preferably> 75 °.
  • the plurality of channels or a tube receiving them without ribs or other projections i. are designed to be untouched.
  • targeted formation of germs can be counteracted, from which a tire surface of the evaporator can emanate.
  • the blower can be an axial blower, preferably a modified axial blower or a radial blower. It is preferably provided that the blower leads the conveyed air uniformly over the entire surface of the evaporator tubes, in particular the flat tubes.
  • the evaporator is constructed of microchannel pipes or channels and has these.
  • lamellar bands to increase the heat exchanger surface is deliberately omitted to avoid the targeted installation of germs, which may emanate from the surface.
  • At least one capillary for supplying refrigerant to the plurality of channels may be provided, wherein it is conceivable that the at least one capillary is arranged in a centrally arranged channel of the plurality of channels.
  • One end of the plurality of channels may be capped by or into which extends at least one capillary for supplying refrigerant, wherein it is preferably provided that the plurality of channels are arranged side by side and the capillary into a centrally disposed channel extends.
  • One end, preferably the other end of the plurality of channels may communicate with a suction line leading to a compressor of a refrigerant circuit of a refrigerator and / or freezer.
  • the flow through the evaporator with refrigerant is of great importance. In order to ensure this in an optimal manner, preferably two paths can be taken.
  • the capillary is introduced into the resulting volume.
  • the other end of the evaporator tube or the Microchannelrohres is connected to the suction line and the heat transfer between the capillary and suction line is designed as usual, the external.
  • the capillary is passed through the suction line and so far into the central channel of the evaporator tube or the MPE flat tube protrudes, as it due to their length is required.
  • the immersion depth should be at least 75% of the length of the evaporator tube or of the flat tube.
  • the end of this evaporator tube or flat tube is suitably closed by the suction line.
  • the suction line can also be performed from the Microchannelrohr or evaporator tube.
  • the Microchannelrohr or evaporator tube It should be taken into account in the economic efficiency of the production of the Radial Scriübertragers, since a continuous production of the spiral is not possible.
  • the plurality of channels is arranged side by side, so that they form a flat tube or are received in a flat tube and / or that the plurality of superimposed layers of the multi-channel evaporator consist of a helically wound tube, in particular flat tube.
  • the individual channels of the evaporator may have a diameter or a hydraulic diameter in the range of 0.1 mm to 5 mm, preferably> 1 mm.
  • the cross section of the individual channels can be in the range between 1 mm 2 and 30 mm 2 , preferably in the range between 4 mm 2 and 20 mm 2 .
  • the cross-sectional profile of the channels may be square, round, elliptical and preferably rectangular.
  • the channels have a greater width than their height, so that there are flat channels or the multi-channel evaporator is designed as a flat tube.
  • the height and the width of the channels is preferably in the range ⁇ 2 cm, preferably in the range ⁇ 1 cm.
  • the channels may have a size (height x width) in the range of 1 x 2 mm to 5 x 10 mm, i. the height preferably varies in the range between 1 mm and 5 mm and the width in the range between 2 mm and 10 mm.
  • Possible examples are channels with the dimensions (height x width) 2 x 3 mm and 2 x 10 mm.
  • Evaporators with one or more of the aforementioned properties are also referred to as microchannel evaporators within the scope of the invention.
  • the plurality of channels may be in thermally conductive contact with at least one cover, in particular with at least one bottom plate and / or with another cover, in particular with a cap in combination, wherein it is preferably provided that the bottom plate is surrounded on both sides with air, so that this also serves as an active evaporator surface.
  • Conceivable is an evaporator assembly with integrated radial heat exchanger Microchannel flat tube, which is uniformly supplied with air by means of a centrally located fan.
  • At least one electric defrost heater is provided, which is preferably arranged at the outflow end of the evaporator and preferably such that it extends at least partially in one of the channels of the plurality of channels in heat-conducting contact and / or such that between two Legs, preferably flexible legs of a tube extending in heat-conducting contact, in which the plurality of channels is arranged or which forms the plurality of channels.
  • the multi-channel evaporator is partially or completely provided on its surface to prevent frost deposition with a hydrophobic or with a superhydrophobic coating.
  • Another effective measure against unwanted frost formation is the installation of a sufficiently large, active evaporator surface, the result of a small temperature difference between the evaporator surface and the air in the freezer compartment or in the compartment in which the evaporator is located.
  • a uniform and thin layer of frost, which nevertheless forms during operation, is eliminated by the running down of the fan in the standstill phase of the refrigeration system.
  • both a heat transport as also a mass transport from the evaporator to the stored frozen food. This leads to the regression of the frost layer on the evaporator and the formation of such a frozen food.
  • This mode of operation also builds up a desiccation of the stored goods in frozen goods storage compartment.
  • Another measure for preventing unwanted frost formation is a suitable superhydrophobic coating of the evaporator surface.
  • frost formation in the refrigerator and / or freezer necessitates severe frost formation, it must be removed by means of an electric defrost heater, which is connected to the flat tubes with good thermal conductivity.
  • an electric defrost heater which is connected to the flat tubes with good thermal conductivity.
  • One possibility is to integrate or arrange this defrost heater in or on the evaporator tube, in particular in or on the microchannel tube.
  • the plurality of channels is at least partially surrounded by a cover, preferably by a cap, which in turn is at least partially surrounded by a module cover, wherein the fan is arranged such that between the cover of the module cover at least one flow channel results, promoted by the air by means of the blower, is preferably aspirated.
  • the plurality of channels is at least partially surrounded by a cover, preferably by a cap, in which a collecting channel for discharging condensation water is arranged, wherein it is preferably provided that the surface in a for the avoidance of Ice deposit is designed suitable shape and provided with a superhydrophobic coating and / or it is preferably provided that the collecting channel is in heat-conducting contact with the plurality of channels in communication.
  • the present invention further relates to a refrigerator and / or freezer according to claim 16, characterized in that the multi-channel evaporator or the multi-channel evaporator system at or in the region of the inner container, preferably at or in the region of the ceiling of the inner container preferably one Freezer compartment of the device is arranged, wherein it is preferably provided that the multi-channel evaporator or the multi-channel evaporator system has at least one cover, preferably at least one bottom plate and that the bottom plate or the other cover is arranged on or in the region of the inner container.
  • the multi-channel evaporator or the multi-channel evaporator system preferably comprising the plurality of channels, the blower, one or more covers, in particular the bottom plate and / or one or more cover caps or the like and at least one line for condensate drainage as common Assembly are executed.
  • the preferably provided slightly inclined mounting of the evaporator assembly on the ceiling of the refrigerator and / or freezer makes the transport of the condensate from the built-in cap, heated collecting trough to the outside possible.
  • the cap is made of a good heat-conducting material, preferably made of aluminum and connected in a suitable form good thermal conductivity with the flat tubes or evaporator tubes. This good heat-conducting connection and the use of aluminum make it possible to dispense with both an electrical heating of the cap, as well as to use the cap as the active evaporator surface.
  • the condensate pipe is also heated electrically.
  • the invention further relates to a method for producing a refrigerator and / or freezer according to one of claims 16 to 18, wherein first the assembly according to claim 18 is introduced as a preassembled module in the device and then an assembly cover is mounted.
  • the entire assembly without module cover is prefabricated mounted on the ceiling of the freezer compartment. After installation, which also serves the air duct assembly cover is attached.
  • the invention further relates to a method of operating a multi-channel evaporator or multi-channel evaporator system according to one of claims 1 to 15 or a refrigerator and / or freezer according to one of claims 16 to 19, wherein the fan, the surfaces, preferably all surfaces of Preferably, a plurality of channels is uniformly supplied with air and continues to operate after the compressor of the refrigerant circuit has been switched off, in order to be able to remove a possible frost accumulation on the evaporator or on the majority of the channels and / or on one or more covers.
  • the airflow in the refrigerator and / or freezer may be that of appliances with a classic evaporator assembly.
  • By reducing the overall height of the previous module from over 200 mm to now about 70 mm for the newly designed assembly results in an increase in the gross volume of at least 15%.
  • the above values are exemplary values which do not limit the invention.
  • FIG. 1 shows a sectional view through the door-side region of a multi-channel evaporator system according to the invention
  • Figure 2 different arrangement options of the capillary and the suction tube to the microchannel flat tube and
  • FIG. 3 shows a perspective view of a microchannel flat tube and a plan view of an end region of the microchannel flat tube.
  • FIG. 1 shows the upper end region of a freezer compartment, the cooled interior of which is delimited by a door (not shown) arranged to the right of the evaporator subassembly and by the inner container 100.
  • the multi-channel evaporator system As can be seen in FIG. 1, in the ceiling area of the inner container 100, i. at its deck-side section the multi-channel evaporator system according to the invention.
  • This comprises one or more flat tubes 10, in which a plurality of channels 12 are arranged to guide the refrigerant.
  • the channels 12 may be separated by walls or else e.g. through openings in the wall with each other.
  • the flat tube 10 arranged at the top is provided with reference numerals of the channels 12.
  • the flat tubes 10 may be components of a flat tube wound around a central axis A having a helical pitch, or may be a plurality of flat tubes 10 made of a plurality of individual flat tubes and communicating with each other so that the refrigerant sequentially supplies them can flow through.
  • the individual layers of the flat tube 10 may be parallel or at an angle to each other.
  • the flat tubes 10 are annular, ie they have a curvature in plan view.
  • the blower 20 is located in the center or in the center of this curvature.
  • the blower 20 is arranged and designed such that it draws in and exhausts air radially, so that the air from the inside to the outside radially or at least partially in the radial direction from each other spaced layers of the flat tubes 10 and the flat tube portion flows around both sides.
  • the reference numeral S the gaps between the individual layers of the flat tubes 10 are marked, these extend over the entire radial extent and in the circumferential direction of the flat tubes 10th
  • Reference numeral 30 denotes the floor panel, reference numeral 40 a cover cap and reference numeral 50 an assembly cover.
  • Intake openings in the outer module cover 50 allow air to pass through a channel 60 formed by the outer module cover 50 and the cap 40 into the fan 20 provided with an inlet nozzle.
  • both a modified axial fan, as well as a radial fan, each designed as a compact module, are used.
  • the fan 20 conveys the air through the radial heat exchanger, i. through the evaporator, which is fixed to the floor panel 30 on the ceiling of the freezer, in an annular space formed by the cap 40.
  • the bottom plate 30 is connected with good thermal conductivity with the radial heat exchanger or with the evaporator tubes and designed so that it bilaterally with air um-. is flowed and thus can be used to increase the evaporator surface.
  • the air exits through a slot which is formed from the housing rear wall or the rear wall of the inner container and module cover 50.
  • the flow through the cooled interior and the drawers therein is carried out in a known manner.
  • all heat transfer surfaces are optimally exposed to air, which on the one hand ensures optimum mass transfer coefficient, but on the other hand also results in ideal heat transfer conditions.
  • the size of the installed evaporator surface can significantly influence the temperature of the evaporators and, at the same time, the pressure ratio of the cycle.
  • Figure 2 shows the end of the evaporator tube 10.
  • the internal heat exchanger is integrated into the suction line.
  • Reference numeral 70 denotes the capillary through which the liquid refrigerant is supplied to the evaporator.
  • Reference numeral 80 denotes the suction line leading to the compressor, through which the evaporated refrigerant is supplied to the compressor.
  • the non-illustrated side of the evaporator tube, in particular of the flat tube 10 is closed, for example, with a cap, the capillary 70 is guided through the suction line 80 and so far into the central channel of the evaporator tube or the MPE - flat tube led in, as required by their length , However, the immersion depth should be at least 75% of the length of the evaporator tube or of the flat tube 10.
  • the end of this evaporator tube or flat tube 10 is suitably closed by the suction line. In the embodiment according to FIG. 2, top illustration, the suction line is closed on one side. The vaporized refrigerant is discharged in the direction in which the capillary 70 extends in the suction line 80.
  • bottom view shows an embodiment in which the suction line 80 is open on both sides, wherein in one end of the suction line 80, the capillary 70 is inserted and the vaporized refrigerant is discharged through the other end.
  • FIG. 3 top view of the end portion of the flat tube 10 can be seen, which is flowed around in the direction of arrow on both sides of air, wherein in the central channel 12, the capillary 70 is inserted.
  • the reference numeral 90 designates the electric defrost heater, which may be inserted into one of the channels 12 or inserted between two legs 14 in the edge region of the flat tube, which are bent towards each other so that the defrost heating 90 is received therein, as shown in FIG. bottom diagram shows.

Landscapes

  • 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)
  • Geometry (AREA)
  • Defrosting Systems (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

L'invention concerne un système d'évaporateur à canaux multiples, qui comprend au moins un évaporateur à canaux multiples présentant une pluralité de canaux qui sont parcourus par un fluide frigorigène lorsque ledit évaporateur à canaux multiples est en service. L'invention se caractérise en ce que l'évaporateur à canaux multiples est conçu de manière incurvée au moins par endroits et en ce qu'il comprend au moins une soufflante qui est montée de sorte que ladite soufflante achemine de l'air également ou exclusivement dans la direction radiale au-dessus de l'évaporateur à canaux multiples conçu de manière incurvée.
EP12723104.1A 2011-05-10 2012-05-04 Système d'évaporateur à canaux multiples Withdrawn EP2593727A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE201120109995 DE202011109995U1 (de) 2011-05-10 2011-05-10 Microchannel Verdampfersystem mit neuartiger Luftführung für No-Frost Gefriergeräte
DE201210005248 DE102012005248A1 (de) 2011-05-10 2012-03-14 Mehrkanal-Verdampfersytem
PCT/EP2012/001935 WO2012156035A2 (fr) 2011-05-10 2012-05-04 Système d'évaporateur à canaux multiples

Publications (1)

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EP2593727A2 true EP2593727A2 (fr) 2013-05-22

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EP12723104.1A Withdrawn EP2593727A2 (fr) 2011-05-10 2012-05-04 Système d'évaporateur à canaux multiples

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EP (1) EP2593727A2 (fr)
DE (1) DE102012005248A1 (fr)
WO (1) WO2012156035A2 (fr)

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CN109341146A (zh) * 2018-09-27 2019-02-15 海信（山东）冰箱有限公司 一种微通道换热器组件及冰箱
CN110160284B (zh) * 2019-04-15 2021-09-21 合肥华凌股份有限公司 制冷设备
CN116086047A (zh) * 2023-01-16 2023-05-09 合肥华凌股份有限公司 一种换热装置及冰箱

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WO2012156035A3 (fr) 2013-05-16
DE102012005248A1 (de) 2013-05-16
WO2012156035A2 (fr) 2012-11-22

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