Classifications

• • 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
  • F28F1/126—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 consisting of zig-zag shaped fins
  • F28F1/128—Fins with openings, e.g. louvered fins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C23/00—Extruding metal; Impact extrusion
  • B21C23/02—Making uncoated products
  • B21C23/04—Making uncoated products by direct extrusion
  • B21C23/08—Making wire, bars, tubes
  • B21C23/085—Making tubes
• • 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
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D53/00—Making other particular articles
  • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
  • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
  • B21D53/085—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal with fins places on zig-zag tubes or parallel tubes
• • 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
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
  • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
  • F28D2021/007—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
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
  • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
  • F28D2021/0071—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
  • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
  • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded

Definitions

• the present invention relates to micro channel (multi-port) based heat exchangers for heat exchange or heat recovery in systems such as refrigeration or heat pump systems, in particular a condenser or evaporator in such systems.
• Micro channel type heat exchangers based on Multi Port Extruded profiles of aluminium are known where serpentine fins, also of aluminium, are provided in the longitudinal direction of and between the extruded tubes or channels.
• the fins are commonly brazed to the profiles at their elbow outer faces (as can be seen in the attached Fig. 1 ).
• Heat exchangers of such type are for instance known from JP laid open publication No. 3-13794
• Fig. 1 shows in perspective view part of a commonly known MPE based heat exchanger with serpentine fin assembly
• Fig. 2 shows a perspective view part of a MPE based heat exchanger with a serpentine fin assembly according to the invention
• Fig. 3 shows examples of extruded profiles that may suitably be used in connection with the present invention
• Fig. 4 shows an expanded view of an assembly of a part of a web-MPE based heat exchanger with a serpentine fin assembly according to the invention
• Fig. 5 shows an embodiment of the extrusion and fin design according to the invention where the crests or bends of the fins are partly removed
• Fig. 6 shows a cross section of the assembly shown in Fig. 5 and how the fins are adopted to and brazed to the extrusions
• Fig. 7 shows an alternative embodiment of the invention where the fins are provided with a "louvre" design.
• Fig. 8 is an illustration of different louver and air flow designs
• Fig. 9 shows alternative serpentine fin enhancement designs shows a further serpentine fin design with optimized reduction of heat transfer in the air flow direction, shows an embodiment of a web-MPE design with optimized braze flanges, shows still another alternative web-MPE design where part of the web material between the ports or tubes of the extrusion is removed.
• a) is a perspective view and b) is a cross section of part of fin and tube embodiment showing a modification with improved bonding/brazing properties.
• Fig. 1 shows in perspective view part of a commonly known MPE based heat exchanger 1 with serpentine fin assembly.
• the serpentine fin 2 of the heat exchanger is provided in the longitudinal direction standing between the multi tube extrusions 3, 4 and is attached to the extrusions at their crests or bends 5 outer faces by means of the brazing 6.
• a heat exchanger of this type is normally composed of a number of such extrusions 3 with "layers" of fins 2 and extrusions 3, 4 (one above the other), depending on the size and heat exchange capacity of the heat exchanger.
• Fig. 2 shows part of a heat exchanger according to the invention where the serpentine fins 9 are provided transversally in relation to the extrusions 7, 8 and laying with their sharp edges 10, 11 perpendicular to the extrusions 7, 8.
• the heat exchanger according to the invention as shown in Fig. 2 may be composed of one, a few, or number of extrusions 3, 4 (see corresponding Fig. 1 ) side by side, with "layers" of fins 9 depending on the size and heat exchange capacity of the heat exchanger.
• the bends of the fins 9 may stretch beyond the side edges of the extrusions 7, 8.
• extruded profiles that may suitably be used in connection with the present invention, i.e. the ordinary multi-port (or channel) extrusion, so-called MPE 5, 7, 8 as mentioned above and shown in figures 1 and 2 and a web type extrusion with "individual" tubes or micro channels 13 interlinked with a thinner flanges or webs 14 in the following referred to as web-MPE..
• Fig. 4 shows an expanded view of an assembly of a part of a web-MPE 12 based heat exchanger with a serpentine fin 16 assembly according to the invention including a manifold 15.
• Heat exchangers of this type is commonly provided with two manifolds, an inlet manifold and outlet manifold and this is therefore just an illustration showing only one manifold 15.
• Fig. 4 also shows by means of arrows the direction of the refrigerant flowing in the web-MPE micro ports or tubes 17, respectively the direction of the air flowing on the outside of the heat-exchanger in the transversal direction of the web-MPE 12 but alongside the serpentine fins 16.
• Fig. 5 further shows an embodiment of the extrusion 12 and fin 18 design according to the invention where the crests or bends of the fins are cut and partly removed, at 19, respectively 20. This is done to enhance and improve the air flow through the fins.
• Fig. 6 still further shows a cross section of a similar assembly as shown in Fig. 5. As can be seen in this figure, part of the material of the fins 18 are removed and thereby adapted to the flanges or web sections 14 of the profiles 12 such that the fins 18 may be connected to the profiles basically along the total outer surface (web 14 including tubes 17) by brazing 21. This will improve the connection between the fins and extrusions and enhance heat transfer between the profile and fin.
• an alternative may be to connect the fins to the tubes only as is indicated in Fig 5.
• Fig. 7 shows an alternative embodiment of the invention where the serpentine fins 22 are provided with a "louver" 23 design to enhance convection of heat from the fins to the air or vice versa (depending on application).
• the fins 22 are provided with vertical slits where the metal along the slits is pressed inwards or outwards creating transversal louvers 23 which are designed to pick up air directing it through the created openings in the fin.
• Fig. 8 which shows different louver and air flow designs.
• the crests or bends of the serpentine fins may be open or closed as stated in the figure.
• Fig. 9 where the fins are provided with lengthwise 25 or crosswise 24 wave designs.
• Other designs may also be possible such as herringbone pattern.
• Fig. 10 shows a design where one or more heat transfer separation zones 31 can be punched in the fin. Similar design is used in the deeper F&T heat exchanger design to suppress heat transfer in the air flow direction.
• Fig. 11 shows an alternative web-MPE design where the ports or tubes of the extrusions 26 are provided with outwardly protruding flanges 27 improving the brazing connection between the fins and extrusions as well as the heat transfer between the fins and aid extrusions.
• Fig. 12 shows an extrusion web design where part of the material of webs 29 is removed to enable drainage between the tubes and when needed to reduce heat transfer in transversal direction of the tubes. If more of the web material is removed, the heat transfer is correspondingly also reduced. This design may be used to optimise heat transfer.
• Fig. 13 a) shows a perspective view and b) is a cross section of part of fin 30 and tube 31 embodiment where the lower part 32 of the fin 30 is buckled outwards to improve the bonding or brazing (attachment) of the fin to the tubes.
• the invention as defined in the claims is not delimited to the example as described above and shown in the figures.
• the heat exchanger can be used, not only as condenser or evaporator in a refrigeration system, but in any system where heat is exchanged or recovered.
• the expression multi tube as defined in the claim may include single or multi tube extruded profiles of aluminium.

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Citations (7)

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• 2014
  • 2014-01-30 KR KR1020157027185A patent/KR102228486B1/ko active IP Right Grant
  • 2014-01-30 EP EP14756963.6A patent/EP2962055B1/en active Active
  • 2014-01-30 CN CN201480024807.7A patent/CN105556235B/zh active Active
  • 2014-01-30 WO PCT/NO2014/000009 patent/WO2014133395A1/en active Application Filing

Patent Citations (7)

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