EP0745813A2 - Echangeur de chaleur, en particulier pour chaudière - Google Patents

Echangeur de chaleur, en particulier pour chaudière Download PDF

Info

Publication number
EP0745813A2
EP0745813A2 EP96108743A EP96108743A EP0745813A2 EP 0745813 A2 EP0745813 A2 EP 0745813A2 EP 96108743 A EP96108743 A EP 96108743A EP 96108743 A EP96108743 A EP 96108743A EP 0745813 A2 EP0745813 A2 EP 0745813A2
Authority
EP
European Patent Office
Prior art keywords
gap
heat exchanger
heat
tube
exchanger according
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Withdrawn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
EP96108743A
Other languages
German (de)
English (en)
Other versions
EP0745813A3 (fr
Inventor
Peter Prof. Dr.-Ing. Hofbauer
Michael Dr.-Ing. Hager
Rolf-Peter Dr.-Ing. Strauss
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.)
Viessmann Generations Group GmbH and Co KG
Original Assignee
Viessmann Werke GmbH and Co KG
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 Viessmann Werke GmbH and Co KG filed Critical Viessmann Werke GmbH and Co KG
Publication of EP0745813A2 publication Critical patent/EP0745813A2/fr
Publication of EP0745813A3 publication Critical patent/EP0745813A3/fr
Withdrawn legal-status Critical Current

Links

Images

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
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
    • F24H1/40—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes
    • F24H1/43—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes helically or spirally coiled
    • 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
    • F28D7/02—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 helically coiled
    • F28D7/024—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 helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration

Definitions

  • the invention relates to a heat exchanger, in particular for a boiler, with at least one tube for the heat-absorbing medium, and a gap delimited by the tube for the passage of the heat-emitting medium essentially radially from the inside to the outside.
  • a heat exchanger of this type is known from PCT WO94 / 16272.
  • At least one tube in the form of a spiral is arranged around a centrally arranged burner, in which the heat-absorbing fluid flows.
  • the tube cross-section is composed of a flattened flat and oval parts arranged on both sides of it, so that each turn of the tube forms flat surfaces, between which there is a gap which has a constant height in the direction of flow of the heat-emitting medium.
  • appropriate spacers are arranged between two adjacent turns of the helix.
  • a generic heat exchanger in which many straight tubes with flow gaps arranged in between are arranged in the form of a cylinder.
  • the invention has for its object to provide an inexpensive heat exchanger with high heat transfer performance with a small volume.
  • the invention is based on the knowledge that the gap described in PCT WO94 / 16272, which has a constant width in the radial flow direction, does not lead to optimal heat transfer values. Deviations in the technical influencing factors over the length of the gap have been found to be the cause of this. For example, the heat given off by the fluid passing through the gap changes its density and thus in turn also its flow velocity within the gap. This flow velocity is also influenced by the geometry of the flow cross section, since this flow cross section is smaller in the area of the inner radius than in the area of the outer radius. It has also been found that the flow along the gap is subject to pressure changes, which in turn are subject to interactions with the density fluctuations and the fluctuations in the flow velocity. Finally, the cooling of the heat-emitting medium leads to a significant change in the heat dissipation as it passes through the gap.
  • the gap should preferably converge in such a way that the speed and / or the heat dissipation and / or the pressure decrease of the heat-emitting medium in the flow direction is approximately constant per unit length.
  • the tube is preferably designed in the manner of a helix, the gap then extending between the individual turns of the helix.
  • the boundary surfaces are curved on both sides of the gap.
  • the boundary surfaces can have the shape of a convex parabola in cross section, the curvature of which decreases towards the end of the column. It has been found that just the design of the boundary surfaces in the manner of a convex parabola leads to the greatest possible constancy of the heat transfer performance over the gap length.
  • the helix is preferably a cylindrical helix.
  • the helix can also be hemispherical or frustoconical, and combinations of these winding shapes are also possible.
  • the helix can have one or more threads. Several nested helices can also be realized.
  • the tube be provided with rounded inlet edges in the area of the gap beginning.
  • the outward and / or the inwardly facing surfaces of the tube are made flat.
  • the outer surfaces only participate in a very small percentage of the total heat exchange, which is why it is advantageous to make the surfaces flat in order to achieve a compact spiral.
  • the inner surfaces should be flat to simplify pipe bending.
  • the heat exchanger provided with the reference numeral 1 in FIG. 1 is inserted into the cylindrical housing 2 of a boiler.
  • the heat exchanger 1 consists of a tube 3 shaped in the form of a cylindrical coil, through which the heat-absorbing fluid and in particular water flows when the boiler is in operation.
  • the helically extending tube 3 divides the interior of the housing 2 into an interior 4 within the coil, and an exterior 5 between the coil and the housing 2.
  • a surface burner 7 is arranged in the interior 4, which in the exemplary embodiment is designed as a hemispherical dome.
  • the hot surface burner 7 emits radiant heat directly onto the inner surfaces of the helical tube 3.
  • heat transfer by convection and heat conduction takes place in that the hot fuel gases of the burner 7 pass through gaps 8, which are located between the individual turns of the tube 3, and thereby give off heat to the wall surfaces of the tube.
  • the cooled hot gases then collect in the outside space 5, from where they are discharged.
  • Fig. 1 the hot boiler with the heat exchanger 1 is shown only in schematic form. Details of the design of the tube 3 and the gap 8 between the individual turns of the tube 3 are explained below with reference to the further figures.
  • Figures 2 and 3 show that the cross section of each individual turn of the tube 3 is primarily square, but not rectangular.
  • the opposite wall surfaces 9, 10 of two adjacent windings 11, 12 are designed obliquely to an imaginary horizontal plane in such a way that a gap 8 converging towards the outside results between the two wall surfaces 9, 10.
  • the direction of flow 13 of the heat-emitting hot gas is shown in FIGS. 2 and 3.
  • the wall surfaces 9, 10 delimiting the gap 8 are each made flat, so that there is a uniformly converging gap.
  • An asymmetry is also possible in which one wall surface is inclined or curved and the other wall surface is straight.
  • the wall surfaces 9, 10 delimiting the gap 8 are curved and have in cross section the shape of a convex parabola, the curvature of which decreases from the beginning of the gap 14 to the end of the gap 15.
  • the tube 3 is provided with rounded inlet edges 16 in the region of the gap beginning 14.
  • the outwardly facing surfaces 17 of the tube 3 are flat, since they hardly participate in the heat exchange. This also applies to the inner surfaces 18, since in this way the helix can be tightly wound at a given distance from the surface burner 7.
  • the gap 8 should converge in such a way that the parameter speed, heat dissipation and pressure decrease of the heat-emitting hot gas in the flow direction 13 are approximately constant per unit length. This is best achieved with the gap design according to FIG. 3, however, the gap design according to FIG. 2 already leads to a considerable homogenization of the amount of heat transferred in the flow direction 13 per unit length.
  • the average height of the gap 8 is many times smaller than the height H of the tube 3, preferably 5 to 20 times.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP96108743A 1995-05-31 1996-05-31 Echangeur de chaleur, en particulier pour chaudière Withdrawn EP0745813A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19519813 1995-05-31
DE19519813 1995-05-31

Publications (2)

Publication Number Publication Date
EP0745813A2 true EP0745813A2 (fr) 1996-12-04
EP0745813A3 EP0745813A3 (fr) 1997-12-29

Family

ID=7763223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96108743A Withdrawn EP0745813A3 (fr) 1995-05-31 1996-05-31 Echangeur de chaleur, en particulier pour chaudière

Country Status (1)

Country Link
EP (1) EP0745813A3 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005028966A1 (fr) * 2003-09-23 2005-03-31 Renato Montini Echangeur de chaleur
EP1624270A1 (fr) * 2004-08-06 2006-02-08 Vaillant GmbH Cellule thermique d'un appareil de chauffage
EP1965146A1 (fr) 2007-02-28 2008-09-03 Joseph Le Mer Echangeur de chaleur à condensation comprenant deux faisceaux primaires et un faisceau secondaire
DE10002894B4 (de) * 1999-01-21 2010-01-21 Vaillant Gmbh Wasserheizer
EP2154444A3 (fr) * 2008-08-16 2012-06-06 Robert Bosch GmbH Echangeur de chaleur pour un appareil de chauffage
WO2010018187A3 (fr) * 2008-08-14 2013-03-21 Robert Bosch Gmbh Chaudière sectionnée en fonte ou en aluminium
WO2015140664A1 (fr) 2014-03-17 2015-09-24 Condevo S.P.A. Cellule d'échange de chaleur et procédé
WO2016207923A1 (fr) * 2015-06-24 2016-12-29 Fontecal S.P.A. Profil de tube pour échangeur de chaleur, échangeur de chaleur pour chaudières à condensation présentant ledit profil, et chaudière à condensation équipée dudit échangeur de chaleur
US9909779B2 (en) 2014-03-17 2018-03-06 Condevo S.P.A. Method of manufacturing a set of heat exchange cells and set of heat exchange cells thus obtained
RU2760544C1 (ru) * 2020-06-05 2021-11-26 Общество с ограниченной ответственность "Теплогазстрой" Спиральный котёл
US20230108472A1 (en) * 2021-10-04 2023-04-06 Condevo S.P.A. Tube winding for a gas heat exchange cell for a boiler

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2952564C1 (de) * 1979-12-28 1981-12-10 Braukmann Armaturen AG, Rothrist Heizungskessel
EP0050696A1 (fr) * 1980-10-24 1982-05-05 SAUNIER DUVAL EAU CHAUDE CHAUFFAGE S.D.E.C.C. - Société anonyme Echangeur de chaleur pour chaudières domestiques de chauffage central
FR2700608B1 (fr) * 1993-01-15 1995-04-07 Joseph Le Mer Elément échangeur de chaleur, procédé et dispositif pour le fabriquer.

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10002894B4 (de) * 1999-01-21 2010-01-21 Vaillant Gmbh Wasserheizer
WO2005028966A1 (fr) * 2003-09-23 2005-03-31 Renato Montini Echangeur de chaleur
EP1624270A1 (fr) * 2004-08-06 2006-02-08 Vaillant GmbH Cellule thermique d'un appareil de chauffage
EP1965146A1 (fr) 2007-02-28 2008-09-03 Joseph Le Mer Echangeur de chaleur à condensation comprenant deux faisceaux primaires et un faisceau secondaire
WO2010018187A3 (fr) * 2008-08-14 2013-03-21 Robert Bosch Gmbh Chaudière sectionnée en fonte ou en aluminium
EP2154444A3 (fr) * 2008-08-16 2012-06-06 Robert Bosch GmbH Echangeur de chaleur pour un appareil de chauffage
US9909779B2 (en) 2014-03-17 2018-03-06 Condevo S.P.A. Method of manufacturing a set of heat exchange cells and set of heat exchange cells thus obtained
US10900691B2 (en) 2014-03-17 2021-01-26 Condevo S.P.A. Heat exchange cell and method
EP3139106A1 (fr) 2014-03-17 2017-03-08 Condevo S.p.A. Cellule et procédé d'échange de chaleur
JP2017510788A (ja) * 2014-03-17 2017-04-13 コンデヴォ ソシエタ ペル アチオニ 熱交換セル及び方法
WO2015140664A1 (fr) 2014-03-17 2015-09-24 Condevo S.P.A. Cellule d'échange de chaleur et procédé
KR101821328B1 (ko) 2014-03-17 2018-03-08 콘데보 에스.피.에이. 열교환 셀 세트의 제조방법 및 그 제조방법에 의해 제조된 열교환 셀 세트
US11761678B2 (en) 2014-03-17 2023-09-19 Condevo S.P.A. Heat exchange cell and method
RU2685759C1 (ru) * 2015-06-24 2019-04-23 Рьелло С.П.А. Профиль трубопровода для теплообменника, теплообменник для конденсационных котлов, содержащий указанный профиль, и конденсационный котел, содержащий указанный теплообменник
WO2016207923A1 (fr) * 2015-06-24 2016-12-29 Fontecal S.P.A. Profil de tube pour échangeur de chaleur, échangeur de chaleur pour chaudières à condensation présentant ledit profil, et chaudière à condensation équipée dudit échangeur de chaleur
US11041659B2 (en) 2015-06-24 2021-06-22 Riello S.P.A. Profile of piping for a heat exchanger, heat exchanger for condensation boilers providing said profile, and condensation boiler providing said heat exchanger
US20180172313A1 (en) * 2015-06-24 2018-06-21 Riello S.P.A. Profile of piping for a heat exchanger, heat exchanger for condensation boilers providing said profile, and condensation boiler providing said heat exchanger
RU2760544C1 (ru) * 2020-06-05 2021-11-26 Общество с ограниченной ответственность "Теплогазстрой" Спиральный котёл
US20230108472A1 (en) * 2021-10-04 2023-04-06 Condevo S.P.A. Tube winding for a gas heat exchange cell for a boiler
US12320549B2 (en) * 2021-10-04 2025-06-03 Condevo S.P.A. Tube winding for a gas heat exchange cell for a boiler

Also Published As

Publication number Publication date
EP0745813A3 (fr) 1997-12-29

Similar Documents

Publication Publication Date Title
DE4205080C2 (de) Wärmeübertragungsröhre
EP0697090B1 (fr) Echangeur de chaleur a tubes a ailettes
DE60209994T2 (de) Wärmetauscherrohr
DE2209325A1 (de) Waermeaustauschrohr mit innenrippen und verfahren zu seiner herstellung
DE3029500A1 (de) Waermeaustauschereinheit
EP0745813A2 (fr) Echangeur de chaleur, en particulier pour chaudière
EP0061779A2 (fr) Echangeur de chaleur
CH666538A5 (de) Waermeuebertrager mit mehreren parallelen rohren und auf diesen angebrachten rippen.
DE2721321C2 (de) Wärmeübertrager mit einer von einem kreiszylindrischen Rohrabschnitt gebildeten inneren Begrenzung und einer etwa dazu koaxialen äusseren Begrenzung
DE2950563C2 (fr)
EP0336106B1 (fr) Procédé de fabrication d'un support pour réacteur catalytique
EP0814312B1 (fr) Dispositif pour la fabrication de tubes concentriques enroulés et échangeur de chaleur à tubes concentriques enroulés
DE1501458A1 (de) Waermetauschvorrichtung
WO2017207091A1 (fr) Tube échangeur de chaleur
DE10210016B9 (de) Wärmeaustauschrohr mit berippter Innenoberfläche
DE2736489C2 (de) Wärmetauscher
DE9418641U1 (de) Wärmeaustauschrohr
EP1788320B1 (fr) Echangeur de chaleur
EP1314947A2 (fr) Echangeur de chaleur, en particulier pour installation de chauffage
DE102009026546B4 (de) Sonnenkollektor
EP0813037A1 (fr) Echangeur de chaleur, en particulier pour une chaudière
DE19616034C2 (de) Wärmetauscher zur Wetterkühlung in Arbeitsbereichen des Berg- und Tunnelbaus
EP1209434B1 (fr) Echangeur de chaleur pour échange de chaleur indirecte
DE102014108890A1 (de) Wärmetauscher
EP0571656B1 (fr) Echangeur de chaleur avec un écoulement guidé

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE FR GB IT LI NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB IT LI NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19980119