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
  • F28D1/03—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 plate-like or laminated conduits
  • F28D1/0308—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 plate-like or laminated conduits the conduits being formed by paired plates touching each other
  • F28D1/0325—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 plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another
  • F28D1/0333—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 plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another the plates having integrated connecting members
• • 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
  • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
• • 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
  • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
  • F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
  • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
  • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
• • 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
  • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
  • F28D2020/0004—Particular heat storage apparatus
  • F28D2020/0008—Particular heat storage apparatus the heat storage material being enclosed in plate-like or laminated elements, e.g. in plates having internal compartments
• • 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
  • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
  • F28D2020/0004—Particular heat storage apparatus
  • F28D2020/0013—Particular heat storage apparatus the heat storage material being enclosed in elements attached to or integral with heat exchange conduits
• • 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
  • F28D2021/008—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for vehicles
  • F28D2021/0085—Evaporators
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/14—Thermal energy storage

Definitions

• the invention relates to a heat exchanger between at least a first fluid and a second fluid, for example used in the automotive field and more particularly to a heat exchanger comprising a plurality of channels for the circulation of the first fluid.
• the invention relates in particular to a heat exchange element of a heat exchanger.
• a heat exchanger has the function of ensuring a heat exchange between a first fluid circulating inside a plurality of channels and an external fluid passing through the heat exchanger.
• the external fluid may be a gaseous flow such as air intended to be blown into the passenger compartment of the vehicle.
• the heat exchange allows to refresh the air blown.
• the channels conventionally open into collectors whose particular function is to allow fluid communication between all the channels or part of this plurality of channels.
• the heat exchanger is connected to the remainder of a fluid circulation circuit, for example an air conditioning circuit for a motor vehicle.
• a fluid circulation circuit for example an air conditioning circuit for a motor vehicle.
• the circulation of the fluid inside the circuit is provided by a compressor driven directly by the engine of the motor vehicle.
• the first fluid may be a refrigerant.
• the thermal storage material may be a frigory storage material.
• it can take the form of a solid material, liquid, or phase change known under the acronym PCM for English "Phase Change Material”.
• the coolant cools both the air passing through the heat exchanger and the thermal storage material.
• the thermal storage material restores the cold (more precisely frigories) to the air passing through the heat exchanger when the engine is shut down.
• the bundle of the heat exchanger comprises a plurality of heat exchange elements, which can also be called tubes, formed of at least a first plate and a second plate also called cooling plates, and a separating plate interposed between the first and second refrigerant plates.
• the first and second refrigerant plates respectively have at least one circulation channel of a first fluid and at least one reservoir of the thermal storage material.
• the separating plate has a plurality of orifices for communicating the channel or channels of circulation of the first plate respectively with a channel of the second plate, or to put in communication the tanks of the two plates.
• the assembly of the two refrigerant plates and the separator plate increases the thickness of the tube relative to a conventional evaporator, especially about 20% which increases the pressure drop on the air.
• the traffic channels may exhibit oscillations and both Refrigerant plates can be arranged in opposition, so that the oscillations of the channels of the two plates are in opposition of phase.
• the filling of the storage material can be achieved by means of at least one orifice supplying a central tank and a plurality of additional holes, for example oblong, are arranged on the separating plate in overlap with lateral tanks of the two. refrigerant plates so that the filling of the central tank ensures the filling of the lateral tanks of the two plates.
• each heat exchange element has covering areas of the tanks to the right of which the partition plate comprises oblong holes. Such a constraint consequently prevents the refrigerant hydraulic section necessary to increase the thermal performance of the exchanger to be increased.
• the heat exchange elements are respectively formed by the assembly of a pair of plates.
• Each plate respectively comprising at least one circulation channel of the first fluid and at least one reservoir of a thermal storage material for a heat exchange between the first fluid and the thermal storage material.
• the plates respectively have two external circulation channels of the first fluid and an intermediate reservoir of a thermal storage material arranged between the two circulation channels.
• the channels and tanks are for example made by stamping and extend substantially rectilinear manner.
• such a heat exchanger may not achieve a certain level of performance required by car manufacturers.
• one of the known solutions of the prior art proposes to have the excrescences on the channels for the circulation of the first fluid.
• the invention therefore aims to provide a heat exchanger with improved performance at least partially overcomes the disadvantages of the prior art.
• the subject of the invention is a heat exchange element comprising at least two assembled plates, said plates respectively having at least one circulation channel of the first fluid and at least one reservoir of a thermal storage material, characterized in that the heat exchange element further comprises at least one inner fin arranged between said two plates.
• the presence of the internal fin between the two plates provides a mechanical strength to the two plates on either side of the inner fin to reduce the thickness of the plates forming the heat exchange element.
• This fin promotes the freezing of the thermal storage material in the reservoirs of the plates.
• the arrangement of the inner fin between the two plates forming the heat exchanger thus improves the performance of the heat exchanger.
• Said heat exchange element may further comprise one or more of the following characteristics, taken separately or in combination:
• said at least one fin is soldered to the two plates on either side of the fin; said plates respectively have two circulation channels of the first fluid and an intermediate reservoir of a thermal storage material arranged between the two circulation channels;
• said at least one fin has two external portions arranged respectively opposite the circulation channels of the two plates and a central portion arranged opposite the reservoirs;
• said at least one fin is substantially corrugated
• said outer and central portions of said at least one fin are substantially corrugated and said at least one fin comprises substantially flat portions of separation between said corrugated portions;
• said heat exchange element has sealing junction zones between, on the one hand, two circulation channels facing the two plates and, on the other hand, two tanks opposite the two plates;
• the channels for the circulation of the first fluid and the tanks for receiving the thermal storage material of said plates are made by stamping.
• the invention also relates to a heat exchanger between at least first and second fluids, comprising a beam provided with at least one heat exchange element as defined above.
• said exchanger is used as an evaporator in an air conditioning circuit.
• FIG. 1 is a perspective view of a heat exchanger according to the invention
• FIG. 2 is a partially exploded view of the heat exchanger of FIG. 1;
• FIG. 3 is a perspective view of an interlayer of the heat exchanger of FIG. 1;
• FIG. 4a is an exploded perspective view of a heat exchange element of the heat exchanger of FIG. 1; ,
• FIG. 4b is a partially assembled view of the heat exchange element of FIG. 4a
• FIG. 5 is a perspective view of an internal fin of the heat exchange element of FIGS. 4a and 4b.
• FIG. 6 is a sectional view of the heat exchange element of Figures 4a and 4b.
• FIG. 1 is a schematic view of a heat exchanger according to the invention.
• This heat exchanger can be used in particular as an evaporator of an air conditioning circuit of a motor vehicle.
• the heat exchanger 1 allows a heat exchange between a first fluid, such as a heat transfer fluid, and a second fluid, such as a gas flow such as an air flow passing through the heat exchanger 1, as shown schematically. by the arrow A in Figure 1.
• the heat exchanger 1 allows a circulation of the heat transfer fluid in one or more passes.
• the circulation of the heat transfer fluid is in six passes: PI, P2, P3, P4, P5, P6.
• the direction of circulation of the heat transfer fluid is shown schematically by arrows.
• other circulation of the coolant can be provided, for example a circulation in four passes.
• the heat exchanger 1 has a generally parallelepipedal shape.
• the heat exchanger 1 comprises a bundle of heat exchange elements 3, the latter being intended to contain on the one hand a heat transfer fluid and on the other hand a thermal storage material.
• the heat transfer fluid may be a refrigerant, for example RI 34a.
• the thermal storage material may be a frigory storage material.
• it can take the form of a solid material, liquid, or phase change known under the acronym PCM for English "Phase Change Material”.
• the bundle comprises a successive stack of aligned heat exchange elements 3, such as heat exchange tubes 3.
• This beam also has, according to the illustrated embodiment, two closure plates 5 at its longitudinal ends on either side of the heat exchange tubes 3. At least one closure plate 5 has orifices 7 opening into the tubes 9 for the supply of heat transfer fluid and the discharge of the heat transfer fluid.
• only one of the closing plates 5 comprises an inlet pipe and an outlet pipe 9.
• the exchanger 1 may further comprise heat exchange pads 21 (see Figure 3), arranged in each case between two heat exchange tubes 3 adjacent.
• a spacer 21 is each placed in the space left free between two heat exchange tubes 3.
• the function of the spacer 21 is to increase the heat exchange surface between a thermal storage material, a fluid coolant contained in the heat exchange tubes 3 and a gas flow, such as the air flow A outside through the heat exchanger 1.
• the spacers 21 may be formed from a metal strip, for example alloy aluminum.
• the heat exchange tubes 3 and the spacers 21 may be brazed together.
• the spacers 21 have for example a generally undulating form.
• a spacer 21 comprises a predefined number of planar walls 23.
• the planar walls 23 are substantially rectangular. These flat walls 23 are substantially parallel and are connected in pairs by folds 25.
• the folds 25 are substantially rounded and the flat walls 23 are connected in pairs by folds 25 so as to form alternating corrugations.
• the spacers 21 may be attached to the exchange tubes 3 by their respective folds, for example by brazing.
• the flat walls 23 comprise a plurality of louvers 27 substantially inclined relative to the general plane P defined by the flat walls 23.
• the louvers 27 can be made by cutting and folding the metal material of the insert 21.
• the louvers 27 therefore define openings at a given opening angle, through which the gas flow passes, which increases the heat exchange surface.
• the louvers 27 create disturbances of the air flow A through the heat exchanger 1, thus promoting heat exchange.
• the louvers 27 of the same group may be substantially identical.
• louvers 27 can extend over the entire height of the plane wall 23.
• the heat exchange tube 3 comprises a pair of plates 29.
• junction flanges 30 formed on the end portions of the plates 29.
• the junction flanges 30 are preferably made of material. by stamping so that they respectively form a ring projecting out of the plane of the plate and delimiting a hole 35.
• the first and the second plates 29 are in this example substantially rectangular.
• the first and second plates 29 may be stamped plates.
• the two stamped plates 29 can be made from metal plates.
• the two plates 29 respectively comprise at least one channel 31 for the coolant and a tank 33 of the thermal storage material.
• the reservoir 33 is separate from the channel 31 for circulating the coolant.
• the plates 29 may respectively present a substantially flat zone 34 between the edges of a heat transfer fluid circulation channel 31 and the edges of a reservoir 33.
• the plates 29 respectively comprise two channels 31 for the coolant and an intermediate reservoir 33 arranged between the two channels 31.
• the channels 31 are for example made by stamping. According to the illustrated example, the channels 31 extend substantially rectilinearly.
• the channels 31 may be substantially identical.
• the intermediate tank 33 may have dimensions identical to those of the two channels 31. Similar to the channels 31, the reservoir 33 may extend substantially rectilinearly.
• the reservoir 33 is arranged in contact with at least one channel 31 for a heat exchange between the storage material and the coolant.
• the plates 29 have respectively at least two inlet and outlet ports 35 for the coolant.
• a plate 29 has four orifices 35 at the ends of the channels 31. These orifices 35 have, for example, a substantially ovoid shape.
• the plates 29 furthermore comprise orifices 37, two in the illustrated example, for filling the tank 33 with thermal storage material.
• an inner fin 39 Between the first and second plates 29 is interposed an inner fin 39.
• This inner fin 39 may be brazed to the plates 29.
• the inner fin 39 may have corrugations. In this case, the peaks of the corrugations can be brazed respectively to the plates 29.
• the inner fin 39 must therefore be dimensioned in height so that each peak can be soldered on the plates 29 between which it is arranged. As for example, the thickness of the fin 39 is between 50 and 100 ⁇ .
• a heat exchange tube 3 is thus made in this embodiment by the juxtaposition of two plates 29 and a fin 39 interposed.
• the fin 39 has at least a first portion 41 facing a channel 31 for circulating the coolant and at least a second portion 43 vis-à-vis the reservoir 33.
• the inner fin 39 has three portions: two first external portions 41 facing the channels 31 for circulating the coolant, separated by a second central portion 43 facing the reservoir 33.
• the inner fin 39 may be corrugated, in this case the inner fin may have corrugations at these portions 41, 43 vis-à-vis the channels 31 or reservoirs 33 of the plates 29, and present substantially plane portions 45 between these fin portions 41, 43. These flat portions 45 are arranged substantially facing the plane zones 34 of the plates 29 when the heat exchange tube 3 is assembled.
• the outer portions 41 of the inner fin 39 are substantially corrugated and that the central portion 43 is substantially flat.
• the pitch of the corrugations can thus vary according to their location with respect to the tube portions. According to the embodiment described, the assembled heat exchange tube 3 thus has three distinct parts which are more clearly visible in FIG.
• the heat exchange tube 3 may have connecting zones 47 between these three portions. These connecting zones 47 are formed by the plane zones 34 of the plates 29
• first and second plates 29 affixed to each side of the inner fin 39, and assembled for example by soldering these three portions are sealed.
• Such internal fin 39 provides a mechanical strength to the heat exchange tube 3.
• the fin 39 for example brazed to the plates 29 on either side of the fin 39, provides a stiffness which prevents the deformation of the plates 29 when the heat exchange tube 3 is subjected to pressure.
• an inner fin 39 made in one piece. According to a variant not shown, it is possible to provide a plurality of separate internal fins respectively interposed between external circulation channels 31, according to this example, and between the tanks 33 of thermal storage material.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Family Cites Families (5)

• 2012
  • 2012-12-20 FR FR1262448A patent/FR3000188B1/fr active Active
• 2013
  • 2013-12-12 WO PCT/EP2013/076402 patent/WO2014095575A1/fr active Application Filing
  • 2013-12-12 EP EP13815706.0A patent/EP2936032A1/de not_active Withdrawn

Non-Patent Citations (1)

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