EP2097704A1 - Echangeur de chaleur interne pour circuit de fluide refrigerant - Google Patents
Echangeur de chaleur interne pour circuit de fluide refrigerantInfo
- Publication number
- EP2097704A1 EP2097704A1 EP07822556A EP07822556A EP2097704A1 EP 2097704 A1 EP2097704 A1 EP 2097704A1 EP 07822556 A EP07822556 A EP 07822556A EP 07822556 A EP07822556 A EP 07822556A EP 2097704 A1 EP2097704 A1 EP 2097704A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- internal heat
- tubes
- refrigerant
- pressure
- 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- Withdrawn
Links
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
- 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
- F28D7/16—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 arranged in parallel spaced relation
- F28D7/1684—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 arranged in parallel spaced relation the conduits having a non-circular cross-section
-
- 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
- F25B40/00—Subcoolers, desuperheaters or superheaters
-
- 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
- F28D7/0041—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 for only one medium being tubes having parts touching each other or tubes assembled in panel form
-
- 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
- F28D7/0066—Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
- F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
-
- 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
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements
- F28F9/0221—Header boxes or end plates formed by stacked elements
-
- 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
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
-
- 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
- F28D2021/0073—Gas 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
- F28F2275/00—Fastening; Joining
- F28F2275/14—Fastening; Joining by using form fitting connection, e.g. with tongue and groove
Definitions
- the invention relates to the field of heat exchangers, particularly for motor vehicles.
- An internal heat exchanger is generally used for the gaseous refrigerant circuits, in particular of the CO 2 type
- the coolant remains essentially in the gaseous state and under a very high pressure which is usually between 100 and 150 bar.
- a circuit is advantageously made in the form of a motor vehicle air conditioning circuit.
- a circuit of this type essentially comprises a compressor, a gas cooler, an internal heat exchanger, an expander, an evaporator and an accumulator, as well as connecting ducts.
- the high pressure refrigerant fluid from the compressor is cooled in the gas cooler, then passes into a first portion of the internal heat exchanger, the portion comprising the high pressure conduits / passes and is then expanded by the expander.
- the low pressure fluid leaving the expander then passes through the evaporator, the accumulator and into a second portion of the internal heat exchanger, the portion comprising the low pressure conduits / passes, before returning to the compressor.
- the internal heat exchanger is mounted at the outlet of the gas cooler and the evaporator, its function being to sub-cool the high-pressure refrigerant coming out of the gas cooler by the low pressure refrigerant exiting the evaporator.
- Such an internal exchanger makes it possible to improve the performance under difficult operating conditions, in particular for high ambient temperatures.
- an internal heat exchanger for a refrigerant circuit comprises a first header and a second header, first tubes for the circulation of the high-pressure refrigerant and second tubes alternating with the first tubes for circulation against -current refrigerant fluid at low pressure.
- the micro-channel tubes generate a lot of pressure losses, which has a direct and harmful influence on the heat exchange between the fluid at two different pressures / temperatures.
- the brazing between the channels, high pressure and low pressure is particularly difficult and never completely satisfactory in the long term (porosity between the high and low pressure tubes)
- the high and low pressure tubes, obtained by extrusion are identical so that the thickness of the low pressure tubes is oversized with respect to its necessary pressure resistance.
- the object of the invention is in particular to overcome the disadvantages of the prior art mentioned above,
- It aims essentially to provide an internal heat exchanger that mainly, but not exclusively, to reduce the pressure drop through the increase of the passage section.
- the invention proposes for this purpose an internal heat exchanger for a refrigerant circuit, comprising at least first tubes for the circulation of the high-pressure refrigerant and means alternating with the first tubes for the circulation of the coolant at low temperatures. pressure, characterized in that said means comprise at least one disrupter.
- the internal heat exchanger according to the invention in that the said means consist of a plurality of disrupters.
- high and low pressure ducts / passes are totally related to the nature and the state of the fluid considered, generally here a supercritical fluid, but the high pressure, or the conduits / passes conveying it, is always present. a pressure higher than the low pressure, or the conduits / passes conveying it.
- the disrupters of the invention may consist of a folded sheet which optionally ensures the sealing of the low pressure pass and being in contact with the adjacent high pressure tubes.
- the disturbers may consist of a corrugated sheet in its length and their profiles may have interruptions in its undulations except the side walls or have embossed or cut.
- the disrupters may consist of a grid, that is to say, corrugations or crenellations having different ranks offset relative to each other, this realization being well known to those skilled in the art.
- the disrupters are distinguished from the tubes essentially in that they consist of a sheet or the like folded (s) open at least partially, that is to say that this sheet does not close on itself to form intrinsically one or conduit (s) or channel (ux).
- the disrupter of the internal exchanger according to the invention makes it possible to bring the plating to facilitate brazing with the extruded tubes and the blade heads. This is a very important advantage over the stack of extruded tubes of internal exchangers of the prior art, on which it is necessary to report active flux.
- the porosity problem is due to an excessive tube / tube contact surface which degrades the thermal conduction.
- the internal heat exchanger according to the invention by the use of disrupters to replace the tubes, allows significant weight savings and cost reductions.
- the disturbers offer a great flexibility from a geometrical point of view, and thus a setting up and an easy assembly.
- the disturbers will present lateral closure means.
- the disrupters of the invention form the housing or the closure envelope between the high pressure tubes.
- these closing means will consist of raised side portions extending said disturbers. These raised lateral parts ideally have a C-profile.
- an insert housing intended in particular to (in) sideways close the ducts / low pressure passes.
- the upper and lower walls of a passage through which the low-pressure refrigerant circulates are formed by an outer wall of two contiguous tubes.
- the present invention relates to an integrated assembly of heat exchangers comprising at least one heat exchanger for cooling a refrigerant, characterized in that it comprises an internal exchanger as described above also for cooling said refrigerant.
- FIG. 1 is a front view of an integrated assembly according to the invention, comprising a gas cooler and the internal heat exchanger of the invention;
- FIG. 2 is an exploded view of the internal heat exchanger according to the invention without housing
- FIG. 3 is a schematic side view of an internal heat exchanger according to the invention with housing
- Figure 4 is a side view of the longitudinal section, cut purely to illustrate the ends, of the internal heat exchanger according to the invention.
- FIG. 5a, 5b and 5c each show an example of a disrupter inserted in the internal heat exchanger according to the invention.
- FIG. 1 shows an integrated assembly 1 comprising a gas cooler 2 and an internal exchanger 3 having a first portion or high pressure path and a second portion or low pressure path.
- a complete air conditioning circuit in which is included the internal heat exchanger 3 and / or the integrated assembly 1 according to the invention, further comprises in particular a compressor, an expander, an evaporator and a coolant accumulator not shown in the accompanying figures.
- the hot refrigerant fluid and high pressure from the compressor is cooled in the gas cooler 2 by heat exchange with a flow of air.
- the hot and high-pressure refrigerant circulates in the first part of the internal exchanger, that is to say the part constituted by conventional tubes 4, where it exchanges heat. with the same refrigerant fluid and low pressure flowing in the second part, the subject of the invention and consisting of disruptors 5.
- the fluid is then expanded in the expander and brought to low pressure, it then passes through the evaporator then the accumulator and finally the second part of the internal heat exchanger 3, as already indicated, before returning to the compressor.
- FIG. 2 illustrates the various elements constituting the internal heat exchanger 3 according to the invention and, at the bottom of the figure, these elements assembled together to form the internal heat exchanger 3.
- the internal heat exchanger 3 comprises a cheek 6 forming an end cap and disposed in the upper stage of the stack of tubes 4 and disrupters 5.
- the tubes 4 and the disrupters 5 are then positioned in position. below the others successively so that once made the fixing, conventionally by brazing, between a disrupter and the two contiguous tubes, namely the fixing to the lower tube and the upper tube, each conduit or low pressure pass is formed by a disrupter 5 and the walls or outer walls of the two adjacent tubes constituting the upper and lower walls of the duct / low-pressure pass.
- End elements 7, not specific to the object of the present invention, are arranged and fixed to the longitudinal ends of each tube 4 and disrupter 5 to conventionally allow the passage of both types of fluid, low pressure and high pressure, respectively in the disturbers 5 and in the tubes 4.
- the internal heat exchanger 3 shown in Figure 2 comprises two fastening flanges 8 forming inlet and / or outlet pipe for the fluid or both (s). Note that the present invention applies that the internal heat exchanger 3 has a diffusion of the two fluids in the opposite direction or in the same direction.
- FIG. 3 illustrates an internal heat exchanger 3 comprising a complementary casing 9 intended primarily to close the sides of the low pressure passes and to reinforce the mechanical cohesion, if any, of the assembly formed of the tubes 4 and the disrupters 5.
- the plate forming the casing 9 is folded to penetrate inside each low-pressure pass 10 and then soldered to the ends of the tubes 4 so that the assembly comprising the tubes 4, the disrupters 5 and the casing 9 forms a unitary and compact whole.
- FIG. 4 schematically illustrates an internal exchanger 3 according to the invention where the superposition or stacking of the tubes 4 and the disturbers 5 is visualized.
- the internal heat exchanger 3 has a high pressure inlet and a high pressure outlet, as well as a low pressure inlet and a low pressure outlet. Since the refrigerant flows countercurrently in both parts and the internal heat exchanger 3, the high pressure inlet and the low pressure outlet are at a first end of the exchanger, while the low inlet pressure and the high-pressure outlet are at another end of the heat exchanger 3.
- An internal exchanger 3 may also be provided in which the
- the low pressure outlet and the high pressure outlet are located at the same end of the internal heat exchanger.
- the connectors used to report the flanges 8 can be soldered directly to the low pressure inlet, ie the inlet for the low-level coolant. pressure, and the low and high pressure exits of the internal heat exchanger 3.
- the connectors slip into a groove made in the blade heads 7, on the height corresponding to the connection, thus ensuring the maintenance in vertical and horizontal position.
- the disruptors 5, 5 ', 5 are brazed to the lower and upper tubes so that the low pressure passes are formed in part by the contiguous upper and lower walls, thus avoiding two thicknesses of tube, or more exactly two thicknesses corresponding to the distance between the ducts of a tube and the outer surface of this tube, because, thanks to the invention, possibly only a sheet thickness is added to the thickness or the said distance this makes it possible to significantly improve the heat exchange between the fluids at two different pressures.
- FIGS. 5a, 5b and 5c show three examples of disruptors 5, 5 'and 5 "having, at their two lateral ends, a C-shaped return 11 so as to have a flat portion 12 extending parallel to the surface of the tubes in order to to be brazed with the latter, when the disturbers 5, 5 'and 5 "are contiguous with the tubes 4.
- the disrupter 5 ' consists of a flat sheet whose two flanges 11 are curved in return, these two flanges 11 extending in the direction of one another and comprising a flat part 13' extending parallel to the central flat or lower portion 12.
- the disrupter 5 "is identical to the disrupter 5 'of FIG. 5a and has a plurality of localized protuberances 14 extending from its flat internal face 12, constituting as many irregularities favoring the heat exchange between fluids at different pressures.
- the disrupter 5 is identical to the disrupter 5 'of FIG. 5a and comprises corrugations 15 stretching over the entire length of the disrupter 5" so that the section of this disrupter has a a plurality of sinuosities or meanders terminated at both ends by the return to C 11.
- the disruptors 5, 5 'and 5 are shorter than the tubes 4 for the circulation of the high-pressure refrigerant
- These disrupters 5, 5' and 5" are centered with respect to the tubes 4 at high pressure, the sealing at Box level is ensured by the low pressure blade head and the high pressure tube.
- the use of these disturbers avoids the problem of porosity between the high and low pressure tubes.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0610186A FR2908871B1 (fr) | 2006-11-21 | 2006-11-21 | Echangeur de chaleur interne pour circuit de fluide refrigerant |
PCT/EP2007/062287 WO2008061918A1 (fr) | 2006-11-21 | 2007-11-13 | Echangeur de chaleur interne pour circuit de fluide refrigerant |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2097704A1 true EP2097704A1 (fr) | 2009-09-09 |
Family
ID=38009510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07822556A Withdrawn EP2097704A1 (fr) | 2006-11-21 | 2007-11-13 | Echangeur de chaleur interne pour circuit de fluide refrigerant |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2097704A1 (fr) |
FR (1) | FR2908871B1 (fr) |
WO (1) | WO2008061918A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107192283A (zh) * | 2017-05-11 | 2017-09-22 | 中国北方车辆研究所 | 圆管‑扁管组合的燃烧余热利用换热装置 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008053308A1 (de) * | 2008-10-27 | 2010-04-29 | Behr Industry Gmbh & Co. Kg | Wärmetauscher |
FR2968752B1 (fr) * | 2010-12-10 | 2014-11-21 | Valeo Systemes Thermiques | Echangeurs de chaleur de type liquide/gaz, notamment pour les equipements de climatisation de vehicule automobile |
FR2968751B1 (fr) * | 2010-12-10 | 2015-12-11 | Valeo Systemes Thermiques | Tete de lame d'echangeur de chaleur entre un premier fluide et un second fluide et echangeur de chaleur, notamment pour automobile, comprenant une telle tete de lame |
DE102011007784A1 (de) | 2011-04-20 | 2012-10-25 | Behr Gmbh & Co. Kg | Kondensator |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0564449A1 (fr) * | 1990-10-26 | 1993-10-13 | Llanelli Radiators Limited | Echangeur de chaleur |
DE19808893A1 (de) * | 1998-03-03 | 1999-09-09 | Behr Gmbh & Co | Wärmeübertragereinheit und diese enthaltende Sammler-Wärmeübertrager-Baueinheit |
JP2000346584A (ja) * | 1999-06-02 | 2000-12-15 | Denso Corp | 熱交換器 |
JP2001050681A (ja) * | 1999-08-06 | 2001-02-23 | Matsushita Electric Ind Co Ltd | 熱交換器およびその熱交換器を用いた冷凍サイクル装置 |
JP3597436B2 (ja) * | 1999-09-16 | 2004-12-08 | 株式会社デンソー | 熱交換器 |
FR2802291B1 (fr) * | 1999-12-09 | 2002-05-31 | Valeo Climatisation | Circuit de climatisation, notamment pour vehicule automobile |
JP4348113B2 (ja) * | 2003-05-23 | 2009-10-21 | 株式会社ヴァレオサーマルシステムズ | 熱交換器 |
DE10346141B4 (de) * | 2003-10-01 | 2006-04-13 | Eaton Fluid Power Gmbh | Wärmetauschereinheit |
DE102005021464A1 (de) * | 2005-05-10 | 2006-11-16 | Modine Manufacturing Co., Racine | Vorrichtung zur Zwischenkühlung |
-
2006
- 2006-11-21 FR FR0610186A patent/FR2908871B1/fr not_active Expired - Fee Related
-
2007
- 2007-11-13 EP EP07822556A patent/EP2097704A1/fr not_active Withdrawn
- 2007-11-13 WO PCT/EP2007/062287 patent/WO2008061918A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2008061918A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107192283A (zh) * | 2017-05-11 | 2017-09-22 | 中国北方车辆研究所 | 圆管‑扁管组合的燃烧余热利用换热装置 |
CN107192283B (zh) * | 2017-05-11 | 2019-08-30 | 中国北方车辆研究所 | 圆管-扁管组合的燃烧余热利用换热装置 |
Also Published As
Publication number | Publication date |
---|---|
FR2908871B1 (fr) | 2008-12-26 |
WO2008061918A1 (fr) | 2008-05-29 |
FR2908871A1 (fr) | 2008-05-23 |
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Owner name: VALEO SYSTEMES THERMIQUES |
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Ipc: F28D 21/00 20060101ALI20161130BHEP Ipc: F28F 13/12 20060101ALI20161130BHEP Ipc: F25B 40/00 20060101AFI20161130BHEP Ipc: F28D 7/00 20060101ALI20161130BHEP Ipc: F28F 3/02 20060101ALI20161130BHEP Ipc: F28F 9/02 20060101ALI20161130BHEP Ipc: F28D 7/16 20060101ALI20161130BHEP |
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