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
  • 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
  • F28F3/027—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 with openings, e.g. louvered corrugated fins; Assemblies of corrugated strips
• • 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
  • F28D1/0341—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 with U-flow or serpentine-flow inside the 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
  • 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
  • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
  • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
  • F28F3/046—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being linear, e.g. corrugations
• • 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
  • F28D2021/0082—Charged air coolers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2215/00—Fins
  • F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities

Definitions

• the invention relates to a spacer for a heat exchanger of a motor vehicle, a heat exchange beam comprising such a spacer and a heat exchanger comprising such a beam.
• It relates in particular to the field of exchangers for supplying air to a motor vehicle engine.
• turbocharged engines with an air intake system or with a system for admitting a mixture of air and exhaust gases collected at the outlet of the engine, called recirculated exhaust gases.
• air or mixture of air and recirculated exhaust gas having been previously compressed.
• engine air will be understood to mean both the air coming from an air intake system and the mixture coming from an intake system of a mixture of air and air. recirculated exhaust gas.
• charge air cooler In order to cool the charge air and its density, it is known from the prior art to cool said charge air by means of a heat exchanger, also called charge air cooler (RAS). It is in particular known charge air coolers alternately comprising charge air circulation circuits and coolant circulation circuits.
• RAS charge air cooler
• spacers also called turbulators or disrupters arranged in the charge air circuit. They are in the form of a rectangular plate folded accordion so as to form a plurality of corrugations extending along a longitudinal axis.
• the supercharging air enters one side of the spacer, and comes out on the other side, following substantially the direction of the undulations.
• the peaks of the corrugations are in thermal contact with the coolant circuit.
• the heat transfer between the two fluids is favored thanks to the extra heat exchange surface provided by the dividers.
• Changes in the configuration of the spacers can further strengthen the heat exchange. They consist in creating disturbances causing a turbulent flow of air during the circulation of the flow through the interlayer.
• interleaves with blinds on the sides of the undulations.
• the louvers are slits made through the material; they are provided with flaps, adjacent to the slot and oriented transversely to the incident direction of the charge air.
• Interlayers are still known whose corrugations are divided and shifted transversely one after the other.
• the object of the invention is to improve the structure of the interlayer, by limiting the pressure drop, while maintaining a high heat transfer between the fluids.
• the invention thus relates to an interlayer intended to promote the exchange of heat between a first fluid and a second fluid, said insert comprising a plate, folded accordion, circulation of the first fluid, said plate being intended to come into contact thermal device with circulation channels of the second fluid, said plate having a multiplicity of edges capable of diverting the flow of said first fluid from a direction of flow, said spacer having an increasing edge density in said direction of flow.
• the spacer comprises, between the inlet and the outlet, a progressively larger number of elements generating disturbances.
• the invention starts from the observation that the ratio between the thermal performance and the pressure drop is dependent on the speed of the air and its temperature; it is notably higher at low speed. It is therefore more useful to have disturbances when the speed has already decreased, that is to say towards the exit of the interlayer, rather than the entry, where the speed is the highest. It is therefore possible to reduce the pressure drop by avoiding generating disturbances at the inlet of the air flow, while maintaining a high-performance heat transfer, by having disturbances at the outlet of the duct. Indeed, the disturbances favor the heat exchange, by increasing the heat transfer coefficient between the fluids.
• said plate comprises a plurality of corrugations intended to guide said fluid in the direction of flow, each corrugation being offset relative to each other in a direction transverse to said direction flow, so that said ridges are formed by opposite end edges of said corrugations.
• the offset between the corrugations causes said ridges to appear in the fluid flow coming from the previous undulation. Consequently, the fluid, guided by the undulations, is disturbed by the edges arranged at the junction of two successive undulations.
• the length of said corrugations is decreasing.
• the interlayer is made of a single plate
• the interlayer comprises at least two zones, each zone having a constant density of edges,
• the heat exchange surface of the interlayer is substantially the same for each of said zones
• the first zone in the direction of flow, has only one ripple
• the corrugations are offset by a distance substantially equal to half the pitch of the corrugation
• the length of the shortest corrugations is between 0.5 and 1.5 mm
• the plate has a thickness in the range of 0.05 to 0.3 mm
• each zone has a length in the range of 10 to 50 mm
• the corrugations have a pitch in the range of 0.5 to 10 mm
• the corrugations have a height in the range of 1 to 15 mm
• the interlayer is made by pressing, molding or stamping a metal plate.
• the invention also relates to a heat exchange beam comprising a plurality of spacers as described above.
• the heat exchange bundle comprises two blades forming a pair, said pair defining a circulation channel of the first fluid in which is located one of said spacers, and two blades of two different pairs defining a circulation channel of the second fluid,
• the heat exchange bundle is configured so that the second fluid flows in a flow perpendicular to the direction of flow
• the circulation channel of the second fluid comprises several passes, allowing said second fluid to change direction from one pass to another,
• the beam comprises as many passes as spacer areas, each pass of the second fluid corresponding to a spacer area.
• the invention further relates to a heat exchanger comprising a heat exchange beam as described above. It may be, for example, a charge air cooler, in particular a charge air cooler in which the charge air is cooled with a cooling liquid.
• FIG. 1 illustrates, in perspective, an exemplary interlayer according to the invention
• FIG. 2 schematically illustrates a cross-sectional view of a corrugation of the insert of FIG. 1
• FIG. 3 illustrates, in perspective, a heat exchanger comprising inserts according to the invention.
• the invention relates to a spacer 1 for promoting heat exchange between a first fluid and a second fluid. It comprises a plate 2 folded accordion, so that the heat exchange surface with the first fluid is important. Said first fluid, flowing along the intermediate 1 in a flow direction 5, is intended to be placed in thermal contact with the circulation channels, not shown in this drawing, the second fluid.
• the first fluid is, for example a gas, in particular of the supercharging air of a turbocharged engine of a vehicle, which must be cooled with the aid of a second fluid, coolant.
• the second fluid is a liquid, in particular an antifreeze liquid, especially a mixture of water and glycol, resulting from a low temperature cooling loop of the vehicle.
• the air enters from one side, called input 7 of the insert, at an elevated temperature, to be cooled, in contact with the plate 2, to the outlet 8 of the insert on the other side.
• Said plate 2 comprises a multiplicity of edges 9 capable of deflecting the flow of said first fluid from the direction of flow 5.
• the ridges 9 cause disturbances in the flow of air, which promote heat transfer between the two. two fluids, via the surface 6 of the interlayer 1.
• the insert 1 has an increasing edge density 9 in the direction of flow 5, in order to avoid unnecessary pressure loss to the input 7 of the spacer, while increasing the heat exchange coefficient at the outlet 8.
• the spacer here comprises a plurality of corrugations 10 for guiding the air in the direction of flow 5.
• Each corrugation 10 defines a series of parallel channels 30 in which the first fluid flows in said flow direction .
• Each corrugation comprises a series of parallel folds 11, separated by vertices 32, intended to come into contact with the circulation ducts of the second fluid.
• the ridges 9 are formed by the so-called transverse edges 34, opposite end of said corrugations 10, perpendicular to a direction of longitudinal extension of said apices 32.
• a corrugation 10 has, on its transverse edges 34, a multiplicity of ridges 9 disturbing the flow of air.
• Said ridges 9 correspond in particular to each opposite end of the folds 11, in said direction of longitudinal extension of said peaks 32.
• Said transverse edges 34 may have a sinusoidal, crenellated, triangular or any other periodic shape, or not.
• FIG. 2 represents a sectional view of a corrugation 10, on which is seen a series of folds and vertices 32, as well as the pitch p and the height h of one of the corrugations 10, respectively equal to a period of said ripple 10 and at the distance between two adjacent peaks 32.
• the pleats 11 are smooth in this embodiment.
• the plate 2 forming the insert 1 is rectangular here, so that said flow direction 5 is parallel to two edges 15 of said plate, which we will call parallel edges, and perpendicular to the other two, which we will call edges of entry 16 and edge of exit 17.
• the corrugations 10 are arranged one after the other, with two of their transverse edges 34 in contact. Each corrugation 10 is shifted relative to one another in a direction transverse to the direction of flow 5. This shift serves to show in the circulation of the fluid coming from the previous undulation, the ridges 9 of the transverse edge 34 of the next wave. It does not modify the unfolded width of the corrugation, that is to say the expanded dimension of the interlayer in the direction perpendicular to said direction of longitudinal extension of said vertices 32.
• the profiles of the corrugations 10 are identical, two by two, the corrugations 10 being offset between them and the vertices 32 of the corrugations 10 being collinear.
• the pitch p of the corrugations is the same for all the corrugations 10. In this way, the choice and adjustment of the density is easier to achieve.
• the length 13 of said corrugations 10 decreases in the direction of flow 5. As a result, a density of increasing edges is obtained. Indeed, as the corrugations 10 are shifted one after the other, the edge density increases if the length 3 of the corrugations 10 decreases.
• the interlayer may comprise several zones 18, each having a constant edge density.
• the first zone 19 is provided with only one corrugation 10. In other words, the first zone 19 has a zero edge density.
• the interlayer 1 has four zones 18 of different densities. As already said, the first 19 has only one undulation 10. The second comprises ten undulations of the same length I, the third has twenty, and the fourth has thirty.
• the interlayer 1 is made of a single plate 2, that is to say that the zones 18 and undulations 10 are material from each other. This avoids the use of assembly processes zones 18 which would have been made separately.
• the heat exchange surface 6 is substantially the same for the corrugations of said zone, irrespective of the number of corrugations 10.
• the offset 20 between the corrugations 10 has a value substantially equal to half the pitch p of the corrugation 10. This characteristic makes it possible to center the ridges 9 in the middle of the airflow coming out of the folds 11 of the previous ripple so that the disturbances are larger and more efficient.
• the zones 18 here have the same length in said direction of longitudinal extension of the vertices 32.
• the heat exchange surface 6 is substantially the same for each of said zones.
• the spacer has a height in the range of 1 to 15 mm, including about 5 mm. He understands four zones 18 of length in the range of 10 to 50 mm, in particular about 30 mm.
• the first zone 19 has a waving length of about 30 mm, while the second zone has wavelengths of about 3 mm, that of the third zone about 1.5 mm and that of the fourth about 1 mm.
• the insert 1 comprises a corrugation provided with louvers . forming said ridges.
• the shutters of the louvers have edges acting disruptive.
• the louvers are in increasing numbers between the entry and the exit of the interlayer, in order to obtain an effect similar to that of the previous embodiment. In this mode, the folds of the corrugations are not smooth, due to the presence of louvers.
• the invention also relates to a heat exchange bundle 21 comprising a plurality of spacers 1.
• the first fluid F1 entering the bundle is divided into several streams, each passing through an interlayer.
• the heat exchange beam 21 comprises a plurality of blades 22, 23 forming a pair, said pair defining a circulation channel 25 of the first fluid F1.
• the spacers 1 are arranged in each channel 25 and are bordered by the blades 22, 23 of the pair. They are fixed to the blades 22, 23 by the apices of the folds 11 of the corrugations 10 and act as a thermal bridge between the two fluids.
• the second fluid F2 flows in circulation channels 28 formed by blades 23, 26 of two different pairs. Said second fluid F2 enters the beam through a pipe 36 and leaves it through a pipe 38. It circulates between the pairs of plates by means of non-visible stampings formed in said plates and interconnecting the circulation channels. said second fluid.
• the beam comprises, alternatively, supercharging air circulation channels and circulating liquid circulation channels 28. cooling, some being superimposed on others.
• the beam is thus formed of a stack of plates and spacers.
• the heat exchange bundle 21 is configured so that the second fluid F2 circulates in the channels formed between the plates in a flow perpendicular to the flow direction 5.
• the circulation channel 28 of the second fluid comprises, in particular, a serpentine circuit, not visible, formed of several passes arranged between the blades
• Each pass is defined as a conduit element, passing through the beam 21 from one transverse edge 40 to the other 42.
• the blades comprise, at each pass, a heat exchange zone between the first fluid and the second fluid, said blades being configured so that the liquid changes direction of circulation between each pass.
• the beam will have as many passes in the blades, as zones 18 of inserts 1, so that each pass of the second fluid corresponds to an area 18 of spacer.
• This arrangement provides a better distribution in the heat exchange.
• the spacers 1 are preferably assembled to the blades 22, 23,
• the invention further relates to a heat exchanger.
• Said heat exchanger comprises a beam 21 as shown in FIG. 3. It furthermore comprises, for example, inlet and / or outlet boxes of the first fluid, not shown.

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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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ID=47022934

Family Applications (1)

Country Status (5)

Families Citing this family (15)

Citations (2)

Family Cites Families (11)

• 2012
  • 2012-09-10 FR FR1258476A patent/FR2995397B1/fr active Active
• 2013
  • 2013-09-10 WO PCT/EP2013/002711 patent/WO2014037122A1/fr active Application Filing
  • 2013-09-10 US US14/426,999 patent/US20150241142A1/en not_active Abandoned
  • 2013-09-10 EP EP13763186.7A patent/EP2893282A1/fr not_active Withdrawn
  • 2013-09-10 KR KR1020157006114A patent/KR20150043388A/ko active Search and Examination

Patent Citations (2)

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