WO1997003333A1 - Echangeur de chaleur regeneratif - Google Patents

Echangeur de chaleur regeneratif Download PDF

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Publication number
WO1997003333A1
WO1997003333A1 PCT/NL1996/000284 NL9600284W WO9703333A1 WO 1997003333 A1 WO1997003333 A1 WO 1997003333A1 NL 9600284 W NL9600284 W NL 9600284W WO 9703333 A1 WO9703333 A1 WO 9703333A1
Authority
WO
WIPO (PCT)
Prior art keywords
medium
heat exchange
transfer
transfer medium
heat exchanger
Prior art date
Application number
PCT/NL1996/000284
Other languages
English (en)
Inventor
Berend Philippus Ter Meulen
Original Assignee
Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno
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 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno filed Critical Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno
Priority to AU64720/96A priority Critical patent/AU6472096A/en
Publication of WO1997003333A1 publication Critical patent/WO1997003333A1/fr

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
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/062—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing tubular conduits

Definitions

  • the invention relates to a regenerative heat exchanger of the type indi ⁇ cated in the preamble of the appended Claim 1.
  • heat exchangers of the abovementioned type heat exchange and mass transfer between the first or second medium respectively and the transfer medium take place on direct contact between the various media. It is known, for example, to insert a transfer medium in the form of a solid body alternately into the first and the second medium stream. Since the transfer medium constructed as a solid body is frequently porous, some of the first medium can mix, via said solid body, with the second medium, or vice versa.
  • the first and the second medium flow alternately through the heat exchange element, whilst the transfer medium constructed as a solid, preferably porous, body is arranged stationary in the heat exchanger.
  • the transfer medium constructed as a solid, preferably porous, body is arranged stationary in the heat exchanger.
  • mass transfer is achieved in that, for example, vapour or gas from the first medium to be treated condenses in or on the transfer medium in order subsequently then to vaporise again and be taken up by the second medium stream.
  • Regenerative heat exchangers are also known with which exclusively heat exchange takes place, that is to say there is no mass transfer at the same time. Exchangers of this type can be found, for example, in the cooling system of, for example, internal combustion engines, where heat from the hot combustion gases is transferred to the lubricating oil, which then releases its heat again to the cooling water circulating through the engine block.
  • the media to be treated, and the transfer medium are kept separate from one another by substantially impermeable barrier layers.
  • the aim of the present invention is to provide a regenerative heat exchanger of the type referred to in the preamble, with which mixing of the first and second media to be treated is kept to the minimum possible, whilst, at the same time, mass transfer and heat exchange are possible.
  • a further aim is to banish the use of a solid body as transfer medium.
  • a more flexible design of the regenerative heat exchanger can be achieved as a resul .
  • the aim of the present invention is achieved with a regenerative heat exchanger which has the characteristics summarised in the appended Claim 1.
  • the term "barrier layer" or “barrier element” is used to denote a facility such that the various first and second media and the transfer medium are essentially kept separate from one another.
  • the term "permeable" is used to denote that the barrier element is also porous or permeable to a specific substance which it is desirable to exchange, via the intervention of the transfer medium, between the first and second media to be treated.
  • Said permeability can be achieved by, for example, making the barrier element porous by perforating the latter, or by selecting a naturally porous material for the barrier element. It is also possible to select a material which is naturally permeable to a specific substance, but despite this is not porous. For instance, plastics are com ⁇ soirally available which are not porous but are permeable to, for example, water vapour but are impermeable to liquid water.
  • the further operating conditions in the heat exchanger according to the present invention can partly determine the permeability of the barrier element.
  • One example is an optional pressure difference which prevails over the barrier element and as a result of which the barrier element is, for example, permeable to a specific substance when the pres- sure difference is relatively high and is impermeable to said substance when the pressure difference is relatively low.
  • An advantageous variant embodiment of the invention is given in the appended Claim 2.
  • the barrier elements ensure that the various media remain separated from one another, control the heat exchange and mass transfer and in this con- text provide a large exchange surface area.
  • Figure 1 shows, diagrammatically, a view of a first embodiment of the invention
  • Figure 2 shows, diagrammatically, a view of a second embodiment of the invention.
  • FIG. 1 shows, diagrammatically, a first heat exchange element 1 and a second heat exchange element 2.
  • Both the first and the second heat exchange elements 1 , 2 are made up of four modules arranged one after the other, as are described in EP-B 0509031.
  • each module consists of a bundle of parallel hollow fibres, the respective ends of which open into collection chambers located opposite one another.
  • the collection cham ⁇ bers form part of a point-symmetrical channel section, inside which said hollow fibres run.
  • the modules can be arranged one after the other in such a way that the fibres of two successive modules enclose an angle.
  • the respective collection chambers of the successive modules are connected to one another.
  • the transfer medium 3 is able, through the hollow fibres, to pass successively through the respective heat exchangers 1 , 2 in the direction of the arrow A in an angularly adapted flow.
  • the modules of the heat exchanger 1 and 2, respectively, which modules are arranged one after the other define an elongated, delimited flow channel for, respectively, a first medium 4 to be treated and a second medium 5 to be treated.
  • Said media 4, 5 to be treated flow over and around the fibre bundles of the first heat exchanger 1 and the second heat exchanger 2.
  • Con ⁇ tinuous circulation of the transfer medium 3 between the first heat exchanger 1 and the second heat exchanger 2 can be provided by means of, for example, a pump 6.
  • FIG. 2 shows, diagrammatically, a system in which the first heat exchanger 1 and the second heat exchanger 2 are integrated.
  • Heat exchanger modules as discussed above, are now arranged one after the other in the direction of flow of the transfer medium 3 in order to bring the first medium 4 and the second medium 5 alternately into a heat exchange and mass transfer relationship with the transfer medium 3.
  • Each module defines a channel section for delimiting the flow of the transfer medium 3.
  • Parallel hollow fibres run transversely to the longitudinal direction of the channel section between opposite walls, so as to open, at their respective ends, into medium collection chambers opposite one another. In each case either the first medium 4 or the second medium 5 flows through the hollow fibres of a module.
  • the other of the two media 4, 5 to be treated flows, protected from the transfer medium 3 and the medium to be treated which is flowing through the hollow fibres, directly through to the subse- quent module, in order to flow through the hollow fibres in that module.
  • the treatment medium 3 is alternately in contact with the first medium 4 and the second medium 5 and flows over and around the hollow fibres.
  • the two embodiments shown in Figures 1 and 2 function as follows: Assume that the first medium 4, which flows into the first heat exchange element 1, is warm and moist air. Also assume that the second medium 5, which enters the second heat exchange element 2, is dry and cold air. Also assume that the transfer medium is a hygroscopic liquid and that the fibres through which the transfer medium 3 flows through the heat exchange elements 1 , 2 are permeable in such a way that they are permeable to water vapour but not or essentially not to the hygroscopic liquid and any liquid water from the transfer medium 3 mixed therewith.
  • the pressure difference between the first medium 4 to be treated and the transfer medium 3, and, respectively, between the second medium 5 to be treated and the transfer medium 3 is also adjusted to the nature of the permeability of the fibres, or barrier elements, in such a way that said pressure difference also guar ⁇ antees that said barrier elements are permeable to water vapour but not permeable to liquid water.
  • the first heat exchange element 1 the hygroscopic liquid 3 will take up heat and moisture from the first medium 4.
  • the hygroscopic liquid 3 then heated and loaded with H 2 0 will subsequently release its heat and moisture in the second heat exchange element 2 to the second medium 5.
  • the air 4 flowing through the first heat exchange element 1 will not mix either with the hygroscopic liquid 3 or with the air 5 flowing through the second heat exchange element 2.
  • the direction of flow of the various media through the various heat exchange elements can be changed. It can also be elected to use a dif- ferent type of heat exchange element.
  • the transfer medium is kept separate, by means of one or more barrier layers of limited permea ⁇ bility, from the two media to be treated, so that said two media to be treated are not able to mix with one another or with the transfer medium, but heat exchange and mass transfer can be achieved between said two media to be treated, via the intervention of the transfer medium.

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

L'invention se rapporte à un échangeur de chaleur régénératif qui comprend un premier élément (1) échangeur de chaleur dans lequel s'écoule un premier milieu à traiter (4), et un second élément (2) échangeur de chaleur dans lequel s'écoule un second milieu à traiter (5), et un milieu de transfert (3) destiné à être en interaction avec le premier élément et le second élément susmentionnés pour engendrer une relation d'échange thermique et de transfert de masse avec le premier milieu et le second milieu, respectivement, le milieu de transfert (3) étant séparé des premier (4) et second (5) milieux par l'intermédiaire d'une ou de plusieurs couches d'arrêt d'échange thermique et de transfert de masse. La perméabilité de la ou des couches d'arrêt est déterminée de manière à permettre le transfert de masse souhaité entre le premier ou le second milieu et le milieu de transfert, mais essentiellement pour empêcher le mélange du premier ou du second milieu avec ledit milieux de transfert.
PCT/NL1996/000284 1995-07-12 1996-07-12 Echangeur de chaleur regeneratif WO1997003333A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU64720/96A AU6472096A (en) 1995-07-12 1996-07-12 Regenerative heat exchanger

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1000786 1995-07-12
NL1000786A NL1000786C2 (nl) 1995-07-12 1995-07-12 Regeneratieve warmtewisselaar.

Publications (1)

Publication Number Publication Date
WO1997003333A1 true WO1997003333A1 (fr) 1997-01-30

Family

ID=19761304

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1996/000284 WO1997003333A1 (fr) 1995-07-12 1996-07-12 Echangeur de chaleur regeneratif

Country Status (3)

Country Link
AU (1) AU6472096A (fr)
NL (1) NL1000786C2 (fr)
WO (1) WO1997003333A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993816A (en) * 1973-07-11 1976-11-23 Rhone-Poulenc S.A. Hollow fiber assembly for use in fluid treatment apparatus
EP0211101A1 (fr) * 1985-08-08 1987-02-25 Interpat Service AG Procédé et dispositif pour condenser, purifier, vaporiser un courant de gaz ou de liquide
WO1991009668A1 (fr) * 1990-01-03 1991-07-11 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Dispositif de transfert servant a transferer des matieres et/ou de la chaleur d'un milieu en ecoulement a un autre
DE4023857A1 (de) * 1990-07-27 1992-01-30 Schilling Heinz Kg Gas/gas-waermeaustauscher mit zwischen-waermetraegermedium fuer gegensinnig tangierende gasstroeme

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993816A (en) * 1973-07-11 1976-11-23 Rhone-Poulenc S.A. Hollow fiber assembly for use in fluid treatment apparatus
EP0211101A1 (fr) * 1985-08-08 1987-02-25 Interpat Service AG Procédé et dispositif pour condenser, purifier, vaporiser un courant de gaz ou de liquide
WO1991009668A1 (fr) * 1990-01-03 1991-07-11 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Dispositif de transfert servant a transferer des matieres et/ou de la chaleur d'un milieu en ecoulement a un autre
DE4023857A1 (de) * 1990-07-27 1992-01-30 Schilling Heinz Kg Gas/gas-waermeaustauscher mit zwischen-waermetraegermedium fuer gegensinnig tangierende gasstroeme

Also Published As

Publication number Publication date
AU6472096A (en) 1997-02-10
NL1000786C2 (nl) 1997-01-14

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