EP2154444A2 - Echangeur de chaleur pour un appareil de chauffage - Google Patents

Echangeur de chaleur pour un appareil de chauffage Download PDF

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Publication number
EP2154444A2
EP2154444A2 EP09167686A EP09167686A EP2154444A2 EP 2154444 A2 EP2154444 A2 EP 2154444A2 EP 09167686 A EP09167686 A EP 09167686A EP 09167686 A EP09167686 A EP 09167686A EP 2154444 A2 EP2154444 A2 EP 2154444A2
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
gap
combustion chamber
exchanger tubes
tubes
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Withdrawn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
EP09167686A
Other languages
German (de)
English (en)
Other versions
EP2154444A3 (fr
Inventor
Thomas Mueller
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2154444A2 publication Critical patent/EP2154444A2/fr
Publication of EP2154444A3 publication Critical patent/EP2154444A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F24H1/403—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes the water tubes being arranged in one or more circles around the burner
    • 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
    • F28D7/005—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 bent portions or being assembled from bent tubes or being tubes having a toroidal configuration
    • 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
    • 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
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple 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
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/26—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means being integral with the element
    • 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
    • F28F2001/027—Tubular elements of cross-section which is non-circular with dimples
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2240/00—Spacing means

Definitions

  • the invention relates to a heat exchanger for a heater, in particular a condensing boiler, according to the preamble of claim 1.
  • Generic heaters are fired with a gas or oil burner and have a cylindrical combustion chamber, which known devices is usually limited radially by a helically coiled heat exchanger. At least one gap between the tube coils for the passage of the hot gases represents the actual heat exchanger surface. Also common are a front cover element for receiving the burner, a rear cover element as a closure for the combustion chamber, supply and return connection and an exhaust gas collection chamber, which radially outside the heat exchanger arranged under a surrounding jacket and provided with a connection piece for an exhaust pipe.
  • the heating water-side flow guide is a forced-flow heat exchanger.
  • a circulation pump ensures a given water volume flow through the mostly relatively narrow water channels. In this way, despite high water content, it is possible to realize quite high heat flow densities entered at the hot gas side.
  • a heater with two helically coiled heat exchangers is known, which are screwed into one another and parallel to each other by a heating medium can be flowed through.
  • the juxtaposed coil ends are connected to each other and have a common connection piece.
  • the supply and return connections are located on opposite ends of the heat exchanger.
  • the DE 10 2004 023 711 B3 also shows a heater with a helically coiled heat exchanger and at least two hydraulically interconnected coil areas. These are formed differently in diameter and can be arranged helically rotated into each other. The exhaust gas thus flows first through the gaps of the inner coil and then over a gap further through the gaps in the outer coil. Because also in this embodiment, a one-piece tube, in particular Square tube, is used, it is hardly possible to influence the gap geometry in manufacturing technology.
  • the invention has for its object to optimize a heat exchanger of a heater, in particular a condensing boiler, especially with regard to the most compact dimensions and good heat transfer properties.
  • the consisting of a cylindrical combustion chamber and a radially this limiting heat exchanger heater is characterized in that the heat exchanger is constructed as a tube bundle heat exchanger and consists of a plurality of annularly arranged, parallel to the longitudinal axis of the combustion chamber heat exchanger tubes. These each form an axially extending gap for the passage of hot gases in the radial direction between two adjacent heat exchanger tubes.
  • the cross section of the heat exchanger tubes is designed sickle-shaped, wherein the respective adjacent heat exchanger tube associated flanks have an identical inner and outer radius. The two radii only have a different relation to one center each.
  • the radially inwardly and outwardly directed surfaces of the heat exchanger tubes are aligned parallel or approximately parallel to each other, so that when juxtaposed Heat exchanger tubes on a pitch circle in the circumferential direction, an inner boundary wall of the combustion chamber and an outer boundary wall of the heat exchanger results because the wall portions of the individual heat exchanger tubes are segmentally consecutively next to each other.
  • the heat exchanger tubes are respectively frontally connected to the front and rear cover element and connected there water side.
  • the gap for the passage of hot gases between two adjacent, associated heat exchanger tubes is formed by a taper of the water-side cross section in the region of the flanks between the tube ends. This taper can be formed on the flank with inner radius, on the flank with outer radius and / or on both flanks.
  • the gap for the passage of hot gases has a width in the range of about 1 mm to 2 mm.
  • the gap for the passage of hot gases may have a constant width over the entire flow path in the radial direction. Alternatively, it is also possible that its width decreases from the inside to the outside and is thereby adapted to the volume of heating gas which decreases with the cooling.
  • beads and / or cams are introduced into one or both flanks of a heat exchanger tube, which constitute the gap limiting surfaces. These define the width of the gap and are based on each other and / or on the opposite surface.
  • the heat exchanger tubes between the two cover elements are arranged with an inclination to a front side.
  • the angle of the heat exchanger tubes to the longitudinal axis of the combustion chamber is up to 15 °.
  • the heat exchanger tubes are each divided into at least two flow channels.
  • an internal combustion chamber close to the flow channel and at least one outer flow channel are formed with a larger cross-section through a partition wall, wherein the inner flow channel is provided as a flow channel and the outer flow channel as a return channel.
  • the partition is formed in a version as a continuous casting profile directly on the heat exchanger tube.
  • beads for receiving a partition on the heat exchanger tube, in particular on the two flanks be formed. Between the beads can be introduced in the longitudinal direction of the partition. In this case, fixing the partition at individual points or at the end regions is sufficient, since complete sealing of the two resulting channels relative to one another is not necessary in principle.
  • a heat exchanger for a heater with the best suitability for condensing operation, very compact dimensions and good heat transfer properties.
  • the heat exchanger design is suitable both for operation with and without forced flow.
  • the overall structure with the same heat exchanger tubes offers not only the advantage of simple production but also variable cover different lengths for different combustion and heat exchanger performance. It is also possible to vary the size of the firebox as well as the heat transfer capacity over the number of tubes and thus the pitch circle diameter. Nevertheless, then all heat exchanger tubes used remain the same, and variants arise only with different cover elements, which can then be connected with the same attachments or components.
  • heat exchanger tubes offer a variety of design options. It can, for example, an aluminum extruded section be used as an endless tube profile, wherein after cutting to length a heat exchanger tube this then at the ends still with a corresponding Expansion must be provided so that there is the gap in the middle area. Furthermore, hydroforming methods for producing the heat exchanger tubes are suitable. Also, stainless steel can be used as a pipe material. As a joining method for heat exchanger tubes, cover elements and / or water-carrying parts, welding, soldering and gluing are suitable.
  • a cylindrical combustion chamber 1 is bounded radially by a heat exchanger, which has at least one gap 2 for the passage of hot gases.
  • An exhaust gas collection chamber 3 is located below a surrounding jacket, not shown, with a connecting piece for an exhaust pipe radially outside the heat exchanger.
  • the heat exchanger consists of a plurality of annularly arranged, parallel to the longitudinal axis of the combustion chamber 1 heat exchanger tubes 4, which each form an axially extending gap 2 for the passage of hot gases in the radial direction between two adjacent heat exchanger tubes 4.
  • the cross section of the heat exchanger tubes 4 is designed sickle-shaped, wherein each of adjacent heat exchanger tube 4 associated flanks 4a, 4b have an identical inner and outer radius.
  • the radially inwardly and outwardly directed surfaces 4c, 4d of the heat exchanger tubes 4 are aligned approximately parallel to one another.
  • the gap for the passage of hot gases between two adjacent, associated heat exchanger tubes 4 is formed by a taper of the water-side cross-section.
  • the edge 4b tapers between the tube ends on a heat exchanger tube 4.
  • beads 5 are introduced, which define the width of the gap 2 and on the opposite surface of the heat exchanger tube 4, there especially on the flank 4a, support.
  • FIG. 5 shows a cross section through a heat exchanger tube 4 with a partition wall 6 to divide the water space into an inner combustion chamber near the flow channel 8 and an outer flow channel 9.
  • the inner flow channel 8 is provided as a flow channel and the outer flow channel 9 as a return channel.
  • beads 7 are formed for receiving the partition wall 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details Of Fluid Heaters (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
EP09167686A 2008-08-16 2009-08-12 Echangeur de chaleur pour un appareil de chauffage Withdrawn EP2154444A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810038041 DE102008038041A1 (de) 2008-08-16 2008-08-16 Wärmetauscher für ein Heizgerät

Publications (2)

Publication Number Publication Date
EP2154444A2 true EP2154444A2 (fr) 2010-02-17
EP2154444A3 EP2154444A3 (fr) 2012-06-06

Family

ID=41066444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09167686A Withdrawn EP2154444A3 (fr) 2008-08-16 2009-08-12 Echangeur de chaleur pour un appareil de chauffage

Country Status (2)

Country Link
EP (1) EP2154444A3 (fr)
DE (1) DE102008038041A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004023711B3 (de) 2004-05-11 2005-10-13 Viessmann Werke Gmbh & Co Kg Heizgerät
DE202005011633U1 (de) 2005-07-20 2006-11-30 Viessmann Werke Gmbh & Co Kg Heizgerät
DE102006029854A1 (de) 2006-06-27 2008-01-03 Mhg Heiztechnik Gmbh Wärmetauscher mit ringförmig ausgebildeten Strömungskanälen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2487956A1 (fr) * 1979-11-30 1982-02-05 Saunier Duval Corps de chauffe pour chaudieres domestiques de chauffage central a eau chaude par le gaz
FR2476808A1 (fr) * 1980-02-22 1981-08-28 Sdecc Echangeur de chaleur formant barriere anti-deflagration pour chaudieres domestiques de chauffage central
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
EP0745813A3 (fr) * 1995-05-31 1997-12-29 VIESSMANN WERKE GmbH & CO. Echangeur de chaleur, en particulier pour chaudière
EP0813037A1 (fr) * 1996-05-31 1997-12-17 VIESSMANN WERKE GmbH & CO. Echangeur de chaleur, en particulier pour une chaudière
CA2211983C (fr) * 1997-02-28 2006-03-14 Miura Co., Ltd. Chaudiere a tubes d'eau
FR2793313B1 (fr) * 1999-05-04 2001-08-03 Guillot Ind Sa Echangeur de chaleur destine a equiper une chaudiere a eau chaude

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004023711B3 (de) 2004-05-11 2005-10-13 Viessmann Werke Gmbh & Co Kg Heizgerät
DE202005011633U1 (de) 2005-07-20 2006-11-30 Viessmann Werke Gmbh & Co Kg Heizgerät
DE102006029854A1 (de) 2006-06-27 2008-01-03 Mhg Heiztechnik Gmbh Wärmetauscher mit ringförmig ausgebildeten Strömungskanälen

Also Published As

Publication number Publication date
DE102008038041A1 (de) 2010-02-25
EP2154444A3 (fr) 2012-06-06

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