EP2304373A1 - Echangeur de chaleur - Google Patents

Echangeur de chaleur

Info

Publication number
EP2304373A1
EP2304373A1 EP09761303A EP09761303A EP2304373A1 EP 2304373 A1 EP2304373 A1 EP 2304373A1 EP 09761303 A EP09761303 A EP 09761303A EP 09761303 A EP09761303 A EP 09761303A EP 2304373 A1 EP2304373 A1 EP 2304373A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
medium
turbomachine
cooling
flow
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Withdrawn
Application number
EP09761303A
Other languages
German (de)
English (en)
Inventor
Holger Janssen
Nicola Kimiaie
Martin Müller
Detlef Hagen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Forschungszentrum Juelich GmbH
Original Assignee
Forschungszentrum Juelich GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Forschungszentrum Juelich GmbH filed Critical Forschungszentrum Juelich GmbH
Publication of EP2304373A1 publication Critical patent/EP2304373A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/08—Fluid driving means, e.g. pumps, fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/28—Safety or protection arrangements; Arrangements for preventing malfunction for preventing noise

Definitions

  • the invention relates to a heat exchanger, in particular an air-cooled heat exchanger.
  • a heat exchanger or heat exchanger is an apparatus that transfers heat or thermal energy from one material stream to another.
  • the direct heat transfer which is based on the process of combined heat and mass transfer in separable material flows
  • the indirect heat transfer which is characterized in that the material flows are spatially separated by a heat-permeable wall
  • the semi-direct heat transfer which uses the properties of a heat accumulator, and in which both substances are brought into contact with the heat accumulator with a time lag.
  • the modes of operation of a heat exchanger can be differentiated according to the type of flow guidance of the media involved.
  • the substances are guided so that they flow past each other in an accommodating manner.
  • the temperatures of the streams are exchanged, that is, the originally cold medium reaches the temperature of the originally hot medium and vice versa. Since, in general, the heat capacity flows are not the same on both sides of the heat exchanger, but in practice this is at most approximately possible.
  • cocurrent the materials are guided so that they flow side by side in the same direction. Ideally, both material temperatures are adjusted and, as a final result, always lie between the initial temperatures.
  • the third variant, the cross-flow guides the streams in such a way that their directions intersect. This material handling is the result between negative and direct current. However, any combinations of these three basic flow guides are also possible. A popular combination is the cross-countercurrent principle.
  • the fabrics are taken past each other in an accommodating way, crossing each other on their way.
  • the temperatures of the streams are exchanged as in countercurrent.
  • Good efficiency for a heat exchanger is always present when the material separating the media has good heat conduction and a large surface area.
  • the heat transfer between the surface and the flowing media should be as good as possible. This is regularly given in a turbulent flow, which often occurs at high flow velocities, or at a high Reynolds number.
  • the other medium is a gas
  • the heat capacity per volume of the media is very different. Therefore, in such cases far more gas than liquid must flow through the heat exchanger in volume.
  • the cooling coils on the back of a refrigerator or air conditioning and the radiator of the car are very different.
  • turbomachines known from the state of the art which are used to convey cooling air through cooling air passages of a heat exchanger, are generally connected from the outside to the heat exchanger. This results in the two ways to arrange the turbomachine sucking or pushing.
  • the designs of turbomachines for cooling air conveying are usually so-called axial or diagonal fans. These fans promote a relatively large amount of air flow at a relatively small size but with low pressure build-up.
  • the geometry of the cooling channels of the heat exchanger must be designed in this regard.
  • the invention has for its object to provide a heat exchanger with a flow machine for a fluid medium available, which overcomes the aforementioned disadvantages of the prior art, and in particular has a compact design and operates sound reduced.
  • the basic idea of the invention is based on the idea of integrating a turbomachine into a heat exchanger in such a way that the disadvantages with respect to noise generation can be largely avoided, and yet a flow-technically expedient, compact, space-saving embodiment is achieved.
  • the invention provides for subdividing the heat exchanger (heat exchanger) into at least two segments, between which at least one turbomachine is arranged.
  • the heat exchanger is in particular a recuperator in which the heat-absorbing or emitting media are spatially separated by a heat-permeable wall.
  • the at least two segments of the heat exchanger, in particular the Cooling channels of the heat exchanger act before and behind the turbomachine advantageous as suction and pressure side muffler.
  • the reflection muffler contains several, in particular four, chambers in order to use the principle of sound reflection. When passing through the interiors several times, the sound pressure amplitude is averaged, which results in a reduction of the sound pressure peaks. Reflections are generated in a muffler by baffles, cross-sectional widenings and constrictions. Depending on the design, however, can be increased in such a gas flow-through muffler of the gas back pressure. Due to the reflection, the low frequencies are mainly damped in the silencer.
  • an absorption silencer contains in its interior a porous material, usually rock wool or glass wool.
  • the material partially absorbs the sound energy and converts it into heat.
  • the effect of sound absorption is enhanced by the multiple reflection.
  • a reduction of 50 dB (A) is possible, which corresponds to a reduction of the sound pressure by a factor of 300.
  • Absorption in the muffler mainly attenuates the upper frequencies.
  • both methods can be combined, as is the case with car exhaust gases.
  • Here are usually two separate silencer (middle and rear silencer) or a combined silencer before.
  • the advantage lies in the coverage of the widest possible frequency spectrum.
  • a designed with ribs, fins or folded sheets heat exchanger, and its cooling or heating channels also have many chamber-like spaces in which the sound generated by the turbomachine is advantageously reflected multiple times, and thus regularly reduced. This applies not only to the suction and pressure noises of the flowing medium, but also to the actual engine noise of the turbomachine.
  • Suitable turbomachines in the context of this invention are both machines for the forwarding of gaseous, as well as liquid media, ie generally to be understood by fluids. Typical representatives would be, for example, axial or radial fans or pumps. The advantageous effect of the sound reduction occurs, although to varying degrees pronounced, both in gaseous, as well as liquid media.
  • the integration of the turbomachine within the heat exchanger also has the advantage that moving parts of the turbomachine, such as rotating fan blades are better protected within the heat exchanger system and also a risk of injury from fast moving parts can be significantly reduced.
  • the at least one turbomachine is integrated in such a way in the heat exchanger, that the channels of the turbomachine are part of the cooling or heating channels of the heat exchanger.
  • the turbomachine must be sealed relative to the spaces through which the medium to be cooled, or the medium to be heated is guided.
  • the at least two segments of the heat exchanger are connected to one another via a deflection in such a way that the same medium to be cooled or heated is conducted past on both sides of the turbomachine.
  • a deflecting device is arranged on one side, which guides the flow of the medium to be cooled or heated around the turbomachine.
  • a typical application would be, for example, fuel cells or fuel cell stacks, in particular direct methanol fuel cell stacks, which are used as alternatives to accumulators in mobile applications, for example in laptops.
  • the method for operating the heat exchangers comprises the following steps.
  • a medium to be cooled or heated is applied to a first segment of a Passed by the heat exchanger, is passed through the cooling or heating channels a cooling or heating medium.
  • the medium to be cooled, or to be heated is then led directly through a turbomachine arranged adjacent to the first segment in order to be guided further past a second segment of the heat exchanger arranged adjacent to the turbomachine, through the cooling or heating channels thereof as well Coolant or heating medium is passed.
  • the first and the second segment of the heat exchanger can be flowed through by the same cooling or heating medium (with diversion) or of different. Accordingly, the flow directions of the cooling or heating medium in the segments can be both rectified, as well as differently directed, but in any case almost perpendicular to the flow direction of the medium to be cooled or to be heated.
  • the method is characterized in that the cooling or heating medium is passed in a heat exchanger at least two sides of a turbomachine, through which the medium to be cooled or heated is passed.
  • the invention advantageously combines a compact construction of a heat exchanger with a sound-damping function of a turbomachine required for the heat exchanger.
  • FIG. 1 shows schematically an embodiment of the invention with a two-part heat exchanger with a segment 2a and a segment 2b in the form of a cross-flow heat exchanger.
  • the heat exchanger serves to cool the medium A with the aid of the cooling medium B, for example air.
  • the partitions between the medium to be cooled A and the cooling medium B are not shown.
  • the turbomachine 1 is arranged between the two segments of the heat exchanger. This arrangement causes not only the noise reduction but also a compact, space-saving design of this overall system.
  • a deflection box (3) for the medium to be cooled A is arranged on one side of the system, so that the medium to be cooled is guided around the turbomachine and at least twice at the cooling channels (suction - and pressure side) is passed.
  • this is a cross-DC heat exchanger.
  • the flow guidance of the cooling medium B remains unchanged from the embodiment in FIG.
  • FIG. 3 A further specific embodiment of the heat exchanger according to the invention according to FIG. 3 shows the integration of two turbomachines Ia, Ib between three segments of a heat exchanger 2a, 2b, 2c.
  • the three flows of the medium to be cooled A run in the same direction.
  • the cooling medium B passes successively through both flow machines 1 a, 1 b.
  • FIG. 4 shows a further embodiment of the invention, in which, as shown in FIG. 3, the cooling medium B successively passes through two flow machines Ia, Ib.
  • the medium to be cooled is passed by two bypasses on both turbomachines.
  • flow guidance of the medium to be cooled as a cross-DC current (not shown) or as a cross countercurrent. It can be left to a person skilled in the art, for a given cooling problem (medium, volume flow, temperature difference, etc.), to determine a suitable flow guidance and the number of turbomachines required for this purpose and to provide it accordingly without being inventive in themselves.

Landscapes

  • 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)

Abstract

La présente invention concerne un échangeur de chaleur qui comporte des canaux permettant de transporter un premier fluide (B) afin de refroidir ou de réchauffer un second fluide (A) et qui comporte en outre une turbomachine (1) disposée sur l’échangeur de chaleur pour l’acheminement du premier fluide (B) à travers les canaux de l’échangeur de chaleur, l’échangeur de chaleur comprenant au moins deux parties entre lesquelles est disposée la turbomachine. Du fait de l’intégration de la turbomachine entre différentes parties (segments) de l’échangeur de chaleur, il est possible de conserver une structure compacte et l’échangeur de chaleur fait office de silencieux pour la turbomachine qui est requise pour le transport du fluide de refroidissement ou de réchauffement à travers l’échangeur de chaleur. Selon l’invention, le procédé permettant le refroidissement ou le réchauffement d’un second fluide (A) par un premier fluide (B) se caractérise en ce que le second fluide (A) est conduit, dans un échangeur de chaleur, le long d’au moins deux côtés d’une turbomachine à travers laquelle le premier liquide (B) est transporté.
EP09761303A 2008-06-13 2009-05-13 Echangeur de chaleur Withdrawn EP2304373A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810028370 DE102008028370A1 (de) 2008-06-13 2008-06-13 Wärmeaustauscher
PCT/DE2009/000681 WO2009149681A1 (fr) 2008-06-13 2009-05-13 Echangeur de chaleur

Publications (1)

Publication Number Publication Date
EP2304373A1 true EP2304373A1 (fr) 2011-04-06

Family

ID=41066620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09761303A Withdrawn EP2304373A1 (fr) 2008-06-13 2009-05-13 Echangeur de chaleur

Country Status (3)

Country Link
EP (1) EP2304373A1 (fr)
DE (1) DE102008028370A1 (fr)
WO (1) WO2009149681A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2195710A (en) * 1986-09-24 1988-04-13 Sec Dep For Trade & Industry T Integrated heat exchanger and pump
EP0584850A1 (fr) * 1992-07-30 1994-03-02 Dsm N.V. Système de refroidissement intégré
EP1327757A1 (fr) * 2002-01-11 2003-07-16 Delphi Technologies, Inc. Radiateur avec collecteur et pompe intégrés

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5850872A (en) * 1995-12-13 1998-12-22 E. I. Du Pont De Nemours And Company Cooling system for vehicles
JP2004319628A (ja) * 2003-04-14 2004-11-11 Hitachi Ltd システムモジュール
EP1923771B1 (fr) * 2003-11-07 2015-05-20 Asetek A/S Système de refroidissement pour ordinateur
JP2005277134A (ja) * 2004-03-25 2005-10-06 Toshiba Home Technology Corp 冷却装置
TW200719804A (en) * 2005-11-07 2007-05-16 Sunonwealth Electr Mach Ind Co Structure of heat dissipation device
JP2007192502A (ja) * 2006-01-20 2007-08-02 Denso Corp 熱交換器
US20070272397A1 (en) * 2006-05-23 2007-11-29 Ilya Reyzin Compact liquid cooling unit for high end servers
DE202007014157U1 (de) * 2007-09-28 2007-12-13 Asia Vital Components Co., Ltd., Hsin Chuan Wasserkühlmodul für elektronisches Gerät

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2195710A (en) * 1986-09-24 1988-04-13 Sec Dep For Trade & Industry T Integrated heat exchanger and pump
EP0584850A1 (fr) * 1992-07-30 1994-03-02 Dsm N.V. Système de refroidissement intégré
EP1327757A1 (fr) * 2002-01-11 2003-07-16 Delphi Technologies, Inc. Radiateur avec collecteur et pompe intégrés

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009149681A1 *

Also Published As

Publication number Publication date
DE102008028370A1 (de) 2009-12-17
WO2009149681A1 (fr) 2009-12-17

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