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
  • F28F1/02—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
  • 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
  • F28D1/0472—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 helically or spirally coiled
  • F28D1/0473—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 helically or spirally coiled 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
  • 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
  • F28D7/02—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 helically coiled
  • F28D7/022—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 helically coiled the conduits of two or more media in heat-exchange relationship being helically coiled, the coils having a cylindrical configuration
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2260/00—Heat exchangers or heat exchange elements having special size, e.g. microstructures
  • F28F2260/02—Heat exchangers or heat exchange elements having special size, e.g. microstructures having microchannels

Definitions

• the subject of the present invention is a microchannel exchanger of the type including the features mentioned in the preamble of the main claim.
• the present invention lends itself particularly, although not exclusively, to application in exchangers with reduced power, of less than 5 kW.
• thermal exchange elements having a high thermal efficiency which comprise two or more pluralities of rectilinear passages of the microchannel type, parallel to one another, and traversed by two or more fluids in thermal contact with one another.
• the principal aim of the present invention is to provide a microchannel exchanger which is structurally and functionally designed to remedy the drawbacks mentioned with reference to the prior art cited, in such a manner as to be effectively usable for applications which require compact geometries and reduced overall dimensions.
• Figure 1 is an axonometric view of a microchannel exchanger produced according to the invention.
• FIG. 2 is a plan view from above of the exchanger of Figure 1
• - Figure 3 is an axonometric view of a detail of the exchanger of
• a microchannel exchanger is indicated as a whole by 1.
• the exchanger 1 comprises a first plurality of microchannels 2, parallel to one another, and a second plurality of microchannels 3, parallel to one another.
• Each of the pluralities of microchannels 2, 3 is provided with respective longitudinal ends for inlet 2a, 3a and outlet 2b, 3b and is respectively traversable by a first and a second heat exchange fluid, which are shown schematically in Figure 1 by the arrows 10a, 10b and 20a, 20b, respectively.
• the arrows 10a, 10b respectively represent the inlet and the outlet of the first heat exchange fluid in the exchanger 1, while the arrows 20a, 20b respectively represent the inlet and the outlet of the second heat exchange fluid in the exchanger 1.
• the longitudinal inlet ends 2a, 3a of the plurality of channels 2, 3 are connected to a respective inlet manifold 4, 5.
• the longitudinal outlet ends 2b, 3b are connected to a respective outlet manifold 6, 7.
• the inlet and outlet manifolds 4, 5, 6 and 7 are of conventional type in shape and dimensions, commonly available on the market.
• the first heat exchange fluid traverses the first plurality of microchannels 2 from the inlet manifold 4 to the outlet manifold 6; the second heat exchange fluid traverses the second plurality of microchannels 3 from the inlet manifold 5 to the outlet manifold 7.
• the two pluralities of microchannels 2, 3 are wound in respective helixes about a winding axis Y in such a manner that, in a plan view ( Figure 2) perpendicular to the winding axis Y, the first plurality of microchannels 2 extends from the inlet manifold 4 to the outlet manifold 6 in a clockwise direction about the axis Y and the second plurality of microchannels extends from the inlet manifold 5 to the outlet manifold 7 in an anticlockwise direction about the same axis Y.
• Each of the two pluralities of channels 2, 3 comprises two multiport tubes 11a, b, 12a, b, respectively.
• Each of the multiport tubes 11a, lib and 12a, 12b has a cross-section flattened along a respective flattening axis X which is orientated in the exchanger 1 so as to be approximately parallel to the winding axis Y.
• each plurality of microchannels comprises three or more multiport tubes interposed between the multiport tubes of the other plurality of microchannels.
• the exchanger 1 is thus formed of helixes of multiport tubes, wound coaxially about the axis Y and with turns that are alongside one another so as to form a cylindrical wall 15, having a longitudinal axis coinciding with the axis Y.
• the exchanger 1 comprises a first and a second axial end 100, 110, opposed to each other and placed respectively at the opposed bases of the cylindrical wall 15.
• the cylindrical wall 15 comprises a plurality of adjacent layers (four layers 15a,b,c,d in the example in the drawings), each corresponding to a respective multiport tube.
• the first, outer layer 15a is formed by the helical winding of the multiport tube 11a
• the second layer 15b is formed by the helical winding of the multiport tube 12a
• the third layer 15c is formed by the helical winding of the multiport tube lib
• the fourth, inner layer 15d, facing towards the axis Y is formed by the helical winding of the multiport tube 12b.
• the microchannels 2, 3 are wound about the axis Y in such a manner that the inlet manifolds 4, 5 are placed at the first axial end 100 of the exchanger 1 and the outlet manifolds 6, 7 are placed at the second axial end 110 of the exchanger 1.
• the microchannels 2, 3 are wound about the axis Y in such a manner that the inlet manifold 4 and the outlet manifold 7 are placed at the first axial end 100 of the exchanger 1 and the inlet manifold 5 and the outlet manifold 6 are placed at the second axial end 110 of the exchanger 1.
• two inlet and/or outlet manifolds are placed in positions spaced apart along the edge of the respective base of the wall 15.
• a method of manufacturing the exchanger 1 comprises the following successive steps of: a. arranging the multiport tubes 11a, lib and 12a, 12b of flattened cross-section along the flattening axis X, so as to obtain the respective pluralities of microchannels 2 and 3, b. winding the multiport tube 12b in a helix about the winding axis Y, from the end 100 to the end 110 of the exchanger 1, with the turns of the helix alongside one another so as to form the layer 15d of the cylindrical wall 15.
• the multiport tube 12b is disposed so that the axes X and Y are parallel to each other. In the plan view in Figure 2 the multiport tube 12b is wound in an anticlockwise direction about the axis Y, c.
• the multiport tube lib is wound in a clockwise direction about the axis Y.
• the ends of the multiport tubes lib and 12b are disposed so as to be spaced apart from each other, d.
• the multiport tube 12a is wound in a helix about the winding axis Y so that the axes X and Y are parallel to each other and the turns of the helix are alongside one another, so as to form the layer 15b of the cylindrical wall 15, adjacent to the layer 15c.
• the tubes 12a, 12b are wound in such a manner as to be parallel to each other.
• the multiport tube 12a is wound in an anticlockwise direction about the axis Y, e.
• the multiport tube 11a is wound in a clockwise direction about the axis Y, f. connecting the inlet manifold 4 to the inlet end 2a of the multiport tubes 11a, lib and the outlet manifold 5 to the outlet end 2b of the multiport tubes 11a, lib, g. connecting the inlet manifold 5 to the inlet end 3a of the multiport tubes 12a, 12b and the outlet manifold 7 to the outlet end 3b of the multiport tubes 12a, 12b.
• the invention thus solves the problem mentioned with reference to the prior art cited, making it possible to obtain low-powered microchannel exchangers of compact dimensions and simple construction while at the same time allowing the production costs to be contained. Moreover, the fact that, at each of the axial ends 100, 110 of the exchanger, the inlet and outlet manifolds are spaced apart from one another, facilitates the connection of the exchanger to the installation into which it is being inserted.
• the exchanger lends itself particularly, although not exclusively, to heat exchange between gases and/or compressed gases, for example compressed air, or to exchange between a working fluid and a cooling gas (evaporator or condenser).
• gases and/or compressed gases for example compressed air
• a cooling gas evaporator or condenser
• An example of use for the exchanger described above is that of a pre- exchange circuit in an air dehumidifier, in which the first heat exchange fluid is hot moist air and the second heat exchange fluid is dry cool air.

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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)
• Physical Or Chemical Processes And Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (5)

Citations (5)

• 2009
  • 2009-04-27 IT ITPD2009A000111A patent/IT1396671B1/it active
• 2010
  • 2010-04-26 WO PCT/EP2010/055512 patent/WO2010125017A1/en active Application Filing

Patent Citations (5)

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