EP0813037A1 - Echangeur de chaleur, en particulier pour une chaudière - Google Patents

Echangeur de chaleur, en particulier pour une chaudière Download PDF

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Publication number
EP0813037A1
EP0813037A1 EP96108744A EP96108744A EP0813037A1 EP 0813037 A1 EP0813037 A1 EP 0813037A1 EP 96108744 A EP96108744 A EP 96108744A EP 96108744 A EP96108744 A EP 96108744A EP 0813037 A1 EP0813037 A1 EP 0813037A1
Authority
EP
European Patent Office
Prior art keywords
tube
profiles
heat exchanger
gap
wall surface
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Withdrawn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
EP96108744A
Other languages
German (de)
English (en)
Inventor
Peter Hofbauer
Michael Hager
Rolf-Peter 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 Werke 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
Priority to EP96108744A priority Critical patent/EP0813037A1/fr
Publication of EP0813037A1 publication Critical patent/EP0813037A1/fr
Withdrawn legal-status Critical Current

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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
    • F28F3/04—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • 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 an inside-out passage of the heat-emitting medium.
  • 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 a heat exchanger and in particular a heat exchanger for a boiler with improved heat transfer within the gap formed between two pipes or two turns. Furthermore, methods for producing the tubes of such a heat exchanger are to be specified.
  • the gap is limited by profiles formed in the opposite wall surfaces of adjacent pipes or pipe windings, the profiles formed in one wall surface being those in the other Cross the wall surface of the formed profiles.
  • the heat-emitting fluid flows through the gap in a wave-like manner, as a result of which the hotter core flow is mixed with the flow that has already cooled near the wall.
  • This mixing leads to an improvement in the heat transfer performance between the heat-emitting and heat-absorbing fluid.
  • an increase in the total surfaces involved in the heat exchange is achieved, whereby the performance of the heat exchanger can be further increased.
  • the tube is preferably of helical design, and the gap runs between the turns of the helix.
  • the profiles are preferably designed so that the pressure loss in the gap is approximately constant over the circumference of the coil. It has proven to be advantageous here if the profiles are designed to be wave-shaped in the circumferential direction of the helix.
  • the profiles according to the invention can be produced inexpensively if the tube is a corrugated tube, the waves of which extend obliquely to the longitudinal axis of the tube form the profiles.
  • the profiles formed in one wall surface cross the profiles formed in the other wall surface at an angle between 60 ° and 120 °.
  • adjacent turns lie directly on top of one another in the region of the elevations of the profiles and are supported on one another. This also facilitates the assembly and installation of the heat exchanger in a boiler.
  • each profiling of the one wall surface viewed over its longitudinal extent, crosses several profilings of the respectively opposite wall surface.
  • the heat transfer capacity also increases if the gap converges in the direction of flow of the heat-emitting medium.
  • the convergence is preferably such 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.
  • a method for producing a tube for a heat exchanger with the features specified above has the special feature that a twisted round tube is used as the starting material for the tube, which is then compressed under deformation forces acting from at least two opposite directions.
  • Another method for producing a tube with the features mentioned has the special feature that a tube with bulbous wall surfaces is used as the starting material for the tube, and that the depressions of the profiles are pressed into the wall surface by a deformation tool rolling under pressure on the bulbous wall surface will.
  • 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 medium 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.
  • 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.
  • the two profiles 15, 16 intersect at an angle of approximately 90 °, the aim being an angle in the range between 60 ° and 120 °.
  • the profiles 15, 16 are aligned obliquely to the main flow direction 17 of the hot gas through the gap 8.
  • each profiling consists of an elongated elevation 18 arranged obliquely to the main flow direction 17 on the respective wall surface 11, 12.
  • the wall surfaces 11, 12 can also be provided with depressions, the only decisive factor is that , viewed in the direction of the pipe longitudinal axis, alternate elevations and depressions.
  • This wave structure leads to very good mixing of the hot gas flowing through the gap 8 essentially in the main flow direction 17.
  • the tube 3 shown in detail in FIG. 2 is an originally smooth-walled tube, having an approximately rectangular cross section, which was provided with the profiles 15 and 16 in a later process step, and only in the axially aligned wall surfaces 11, 12, however not on the inner surface 9 and the outer surface 10.
  • a possible method for producing this coiled tube is shown in FIG. 3.
  • the desired wave structure of the profiles is generated by a tool 19, which rolls on the wall surface.
  • the tool 19 is provided with spiral-shaped grooves 20 which form elevations 18 when they roll on the wall surface, in that the wall material which is not to be designed as an elevation is compressed by the tool 19 in the direction of the pipe center axis.
  • the tube must have a slightly bulbous cross-section, for example in the shape of a barrel, before the wave structure is embossed.
  • the wave-shaped profiling is produced simultaneously with the winding of the tube into a coil, or else afterwards.
  • two tools 19 are used, which are then supported against one another, or a tool 19 of the type shown in FIG. 3 must be guided in the gap between two adjacent windings, in which case the tool 19 simultaneously processes both wall surfaces on both sides of the gap.
  • a twisted round tube is used as the starting material, which is then compressed under deformation forces which act on the round tube from at least two opposite directions.
  • the wave structure is already on the starting material, only this has to be formed from the originally essentially round cross-sectional shape to a cross-sectional shape with two parallel surfaces in order to create a flow gap.
  • the two wall surfaces delimiting the gap between them do not necessarily have to be aligned in parallel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP96108744A 1996-05-31 1996-05-31 Echangeur de chaleur, en particulier pour une chaudière Withdrawn EP0813037A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96108744A EP0813037A1 (fr) 1996-05-31 1996-05-31 Echangeur de chaleur, en particulier pour une chaudière

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96108744A EP0813037A1 (fr) 1996-05-31 1996-05-31 Echangeur de chaleur, en particulier pour une chaudière

Publications (1)

Publication Number Publication Date
EP0813037A1 true EP0813037A1 (fr) 1997-12-17

Family

ID=8222837

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96108744A Withdrawn EP0813037A1 (fr) 1996-05-31 1996-05-31 Echangeur de chaleur, en particulier pour une chaudière

Country Status (1)

Country Link
EP (1) EP0813037A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009115447A2 (fr) * 2008-03-15 2009-09-24 Robert Bosch Gmbh Appareil de chauffage
EP2154444A3 (fr) * 2008-08-16 2012-06-06 Robert Bosch GmbH Echangeur de chaleur pour un appareil de chauffage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1567831A (fr) * 1967-06-08 1969-04-08
DE2856678A1 (de) * 1977-12-31 1979-07-05 United Stirling Ab & Co Waermetauscher
EP0162827A2 (fr) * 1984-05-24 1985-11-27 Armaturjonsson AB Tube pour échangeur de chaleur
EP0298369A1 (fr) * 1987-07-08 1989-01-11 Witzenmann GmbH Metallschlauch-Fabrik Pforzheim Elément d'échange de chaleur en forme d'un tube ondulé
EP0467250A1 (fr) * 1990-07-17 1992-01-22 Hans Dr. Viessmann Tuyau plat de tirage pour gaz de chauffage
WO1994016272A1 (fr) 1993-01-15 1994-07-21 Joseph Le Mer Element echangeur de chaleur, procede et dispositif pour le fabriquer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1567831A (fr) * 1967-06-08 1969-04-08
DE2856678A1 (de) * 1977-12-31 1979-07-05 United Stirling Ab & Co Waermetauscher
EP0162827A2 (fr) * 1984-05-24 1985-11-27 Armaturjonsson AB Tube pour échangeur de chaleur
EP0298369A1 (fr) * 1987-07-08 1989-01-11 Witzenmann GmbH Metallschlauch-Fabrik Pforzheim Elément d'échange de chaleur en forme d'un tube ondulé
EP0467250A1 (fr) * 1990-07-17 1992-01-22 Hans Dr. Viessmann Tuyau plat de tirage pour gaz de chauffage
WO1994016272A1 (fr) 1993-01-15 1994-07-21 Joseph Le Mer Element echangeur de chaleur, procede et dispositif pour le fabriquer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009115447A2 (fr) * 2008-03-15 2009-09-24 Robert Bosch Gmbh Appareil de chauffage
WO2009115447A3 (fr) * 2008-03-15 2012-10-18 Robert Bosch Gmbh Appareil de chauffage
EP2154444A3 (fr) * 2008-08-16 2012-06-06 Robert Bosch GmbH Echangeur de chaleur pour un appareil de chauffage

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