EP1703226B1 - Echangeur de chaleur avec des éléments échangeur de chaleur optimisés - Google Patents

Echangeur de chaleur avec des éléments échangeur de chaleur optimisés Download PDF

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Publication number
EP1703226B1
EP1703226B1 EP20050112088 EP05112088A EP1703226B1 EP 1703226 B1 EP1703226 B1 EP 1703226B1 EP 20050112088 EP20050112088 EP 20050112088 EP 05112088 A EP05112088 A EP 05112088A EP 1703226 B1 EP1703226 B1 EP 1703226B1
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EP
European Patent Office
Prior art keywords
heat
heat transfer
transverse
heat exchanger
transfer elements
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.)
Expired - Fee Related
Application number
EP20050112088
Other languages
German (de)
English (en)
Other versions
EP1703226A1 (fr
Inventor
Franz Schmuker
Albrecht Schaefer
Manfred Hosch
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
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1703226A1 publication Critical patent/EP1703226A1/fr
Application granted granted Critical
Publication of EP1703226B1 publication Critical patent/EP1703226B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F24H9/001—Guiding means
    • F24H9/0026—Guiding means in combustion gas channels
    • 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
    • F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
    • F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body

Definitions

  • the invention relates to a heat exchanger with optimized heat transfer elements for the transfer of heat from a combustion gas through a heat transferring wall on flowing on the outside of the wall in flow channels heating water according to the preamble of claim 1.
  • a heat exchanger having fin and pin shaped heat transfer elements for transferring heat from a combustion gas through a wall to a heating water flowing in flow channels on the outside of the wall.
  • the rib and pin-shaped heat transfer elements are arranged opposite one another on the inside of the wall and run in a single direction.
  • a combustion chamber is formed, in which the fuel gas of a burner is burned.
  • the combustion chamber is adjoined in the direction of flow of the combustion gas in a series formed rib-shaped heat transfer elements.
  • a plurality of rows of pin-shaped heat transfer elements are formed, wherein the pin-shaped heat transfer elements of the individual rows are arranged offset from one another.
  • the pin-shaped heat transfer elements are in several rows successively arranged further pin-shaped heat transfer elements, which are, however, spaced closer than the upstream pin-shaped heat transfer elements.
  • a heat exchanger with heat transfer elements in which the heat transfer elements are integrally formed on the inside of the heat-transferring wall and extend into a combustion gas flowing through the flue gas.
  • the heat transfer elements are integrally formed on the inside of the heat-transferring wall and extend into a combustion gas flowing through the flue gas.
  • at least one transverse heat transfer element is designed with a cross section which has a greater extent transverse to the flow direction of the combustion gas as parallel to the flow direction of the combustion gas.
  • Object of the present invention is to achieve an increase in the heat transfer performance of the heat exchanger, wherein the heat resistance of the heat transfer elements must be ensured under consideration of the required efficiency.
  • the course of the heat transfer elements in only one direction should be maintained.
  • the object of the invention is achieved with the characterizing features of claim 1.
  • the ratio of surface to administratleitquerites is reduced compared with a pin-shaped heat transfer element with in the vertical and horizontal direction almost the same extent.
  • the thermal load of the heat transfer elements is reduced. This protects the heat transfer element from overheating.
  • a flow deflection of the combustion gases is achieved at this point, thereby achieving the reduction of heat transfer to the thermally highly loaded heat transfer element.
  • the transverse to the flow direction of the combustion gas heat transfer element thus acts mainly for the flow deflection of the combustion gas.
  • the flow in the region of the thermally highly loaded heat transfer elements is greatly slowed by a partial shut-off of the flow cross-section at this point. This reduces the flow velocity and thus the heat transfer coefficient at the thermally highly loaded heat transfer elements.
  • By the transverse heat transfer elements also a deflection of the combustion gases is achieved in less thermally highly loaded areas of the heat exchanger.
  • the essential advantage of the invention is also that the Strömungsleitgeometrie is achieved to increase the performance of the heat exchanger without additional components and can be realized by cast-on rib and / or pin-shaped heat transfer elements.
  • the transverse to the flow direction of the combustion gas has at least twice as large extent as parallel to the flow direction of the combustion gas.
  • the transversely located heat transfer element is upstream in the flow direction of the combustion gas extending in the flow direction extended rib-shaped heat transfer element.
  • the transverse heat transfer element has a trough-shaped surface opposite to the flow direction, wherein the trough-shaped surface is substantially a negative image of the opposite surface of the upstream elongate rib-shaped heat transfer element.
  • a substantial increase in the heat transfer performance is achieved if four transverse heat transfer elements are arranged in a direction perpendicular to the flow direction of the combustion gas level of Thompsonyakes, each extending two transverse heat transfer elements from the opposite side of the heat transferring wall in the same direction.
  • the flow cross-section of the heating gas train is extended in the direction of low-loaded thermal regions of the heat exchanger. It is particularly advantageous if the heat exchanger is produced by casting from a metallic material and if at least the transverse heat transfer element is cast onto the heat-transferring wall.
  • FIG. 1 illustrated heat exchanger for a heater in particular for a condensing boiler, has a base body 10 with a heat-transferring wall 11 and with a burner-side opening 15 and an exhaust-side opening 16.
  • a burner not shown, is used, in which a fuel gas / air mixture is burned.
  • the adjoining the burner space within the body 10 forms a combustion chamber 17, in which the combustible gas / air mixture is burned.
  • a heating gas duct 19 Connected to the combustion chamber 17 within the main body 10 is a heating gas duct 19, through which the combustion gas flows to the exhaust-gas-side opening 16.
  • heat transfer elements are arranged, which protrude into the heating gas 19 and will be discussed in more detail later.
  • On the outside of the heat-transferring wall 11 extends helically a trench-shaped recess 23 which is initially open on the base body 10 to the outside.
  • the base body is surrounded by a jacket, not shown, so that the trench-shaped recess 23 forms a helically extending flow channel for heating water of a heating circuit, not shown, of the heater.
  • the main body 10 is a light metal casting, preferably an aluminum sand casting component, which is particularly suitable as a material for heat exchangers of heaters due to its corrosion resistance and heat absorption and thermal conductivity.
  • the main body 10 is designed with a circular cross-section and is slightly conical in the flow direction of the combustion gas with decreasing diameter. However, it is just as conceivable to carry out the basic body 10 cylindrically or with an oval cross-section.
  • the heat transfer elements projecting into the heating gas duct 19 have different cross-sectional shapes, the different cross-sectional shapes being arranged in different sections 31, 32 and 33 of the heating gas duct 19.
  • First section 31 are formed in the flow direction extending rib-shaped heat transfer elements 34 and, for example, four elongated rib-shaped heat transfer element 40.
  • second section 32 are pin-shaped heat transfer elements 35 and, for example, four transverse heat transfer elements 50 are arranged.
  • the third section 33 adjoining the second section there are further pin-shaped heat transfer elements 36.
  • the elongated rib-shaped heat transfer elements 40 are formed from a rib-shaped heat transfer element 34 and a subsequent pin-shaped heat transfer element 35, wherein at the transition from the rib-shaped heat transfer element to the pin-shaped heat transfer element, a mutual notch is formed.
  • the further pin-shaped heat transfer elements 36 have a cross section with a curved surface facing the flow and a flat surface facing in the flow direction.
  • the extended rib-shaped heat transfer elements 40 arranged in the first section 31 are arranged upstream of the transverse heat transfer elements 50 arranged in the second section 32 in the flow direction.
  • the transverse heat transfer elements 50 have according to FIG. 3 a cross-section, which originates in its outer contour substantially to two adjacent pin-shaped heat transfer elements 35 which are interconnected, wherein between a surface having a trough-shaped recess 51 is formed, which substantially to the shape of the opposite surface of the upstream extended rib-shaped heat transfer element 40th is adjusted.
  • the downstream surface of the transverse heat transfer element 50 is provided with two flats 52 between which a notch 53 is centrally formed.
  • the various heat transfer elements are respectively formed on the inside of the heat-transferring wall 11 and each extending from the opposite side of the heat-transferring wall 11 in a single direction ( FIG. 2 ).
  • the various heat transfer elements are produced by casting together with the heat exchanger, so that at least the transverse heat transfer elements 50 and the extended rib-shaped heat transfer elements 40 are cast onto the heat-transferring wall 11.
  • a Cavity 38 is present, in which an unillustrated displacement body is used, through which the combustion gas is forced in the direction of formed between the heat transfer elements 19 Schugaszuges.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Details Of Fluid Heaters (AREA)

Claims (7)

  1. Echangeur de chaleur comprenant des éléments de transmission de chaleur pour la transmission de chaleur provenant d'un gaz de combustion par une paroi (11) thermoconductrice à de l'eau de chauffage circulant sur le côté extérieur de la paroi (11) thermoconductrice dans des canaux d'écoulement, les éléments de transmission de chaleur étant formés sur le côté intérieur de la paroi (11) thermoconductrice et s'étendant dans un passage de gaz de chauffage (19) traversé par du gaz de combustion, et au moins un élément de transmission de chaleur (50) situé en travers étant réalisé dans un tronçon du passage de gaz de chauffage (19) avec une section qui présente, transversalement au sens d'écoulement du gaz de combustion, une extension plus grande que parallèlement au sens d'écoulement du gaz de combustion, caractérisé en ce que l'élément de transmission de chaleur (50) situé en travers présente transversalement au sens d'écoulement du gaz de combustion une surface avec une cavité (51) en forme de cuvette.
  2. Echangeur de chaleur selon la revendication 1, caractérisé en ce que la surface de la cavité (51) en forme de cuvette est pour l'essentiel une représentation négative d'une surface opposée d'un élément de transmission de chaleur placé en amont dans le sens d'écoulement.
  3. Echangeur de chaleur selon la revendication 1 ou 2, caractérisé en ce que l'élément de transmission de chaleur (50) situé en travers présente en aval une surface avec deux parties aplaties (52) entre lesquelles est formée au centre une entaille (53).
  4. Echangeur de chaleur selon l'une quelconque des revendications précédentes, caractérisé en ce que quatre éléments de transmission de chaleur (50) situés en travers sont disposés dans un plan, agencé perpendiculairement au sens d'écoulement du gaz de combustion, du passage de gaz de chauffage (19), sachant qu'a chaque fois deux éléments de transmission de chaleur (50) situés en travers s'étendent depuis le côté opposé et thermoconducteur de la paroi (11) thermoconductrice dans la même direction.
  5. Echangeur de chaleur selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un élément de transmission de chaleur (40) en forme de nervure, allongé et s'étendant dans le sens d'écoulement, est monté en avant de l'élément de transmission de chaleur (50) situé en travers dans le sens d'écoulement du gaz de combustion.
  6. Echangeur de chaleur selon l'une quelconque des revendications précédentes, caractérisé en ce que, au voisinage des éléments de transmission de chaleur (50) situés en travers, la section d'écoulement du passage de gaz de chauffage (19) est réalisée de façon élargie dans le sens de zones thermiques faiblement sollicitées de l'échangeur de chaleur.
  7. Echangeur de chaleur selon l'une quelconque des revendications précédentes, caractérisé en ce que l'échangeur de chaleur est fabriqué par coulée à base d'un matériau métallique et en ce qu'au moins l'élément de transmission de chaleur (50) situé en travers est lié par fusion à la paroi (11) therconductrice.
EP20050112088 2005-02-02 2005-12-14 Echangeur de chaleur avec des éléments échangeur de chaleur optimisés Expired - Fee Related EP1703226B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510004740 DE102005004740B3 (de) 2005-02-02 2005-02-02 Wärmetauscher mit optimierten Wärmeübertragungselementen

Publications (2)

Publication Number Publication Date
EP1703226A1 EP1703226A1 (fr) 2006-09-20
EP1703226B1 true EP1703226B1 (fr) 2011-07-27

Family

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Family Applications (1)

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EP20050112088 Expired - Fee Related EP1703226B1 (fr) 2005-02-02 2005-12-14 Echangeur de chaleur avec des éléments échangeur de chaleur optimisés

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EP (1) EP1703226B1 (fr)
DE (1) DE102005004740B3 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR957533A (fr) * 1950-02-23
US1855777A (en) * 1928-03-28 1932-04-26 Bryant Heater & Mfg Company Boiler section
DE9017405U1 (fr) * 1990-12-22 1991-03-21 Buderus Heiztechnik Gmbh, 6330 Wetzlar, De
DE10013608C2 (de) * 2000-03-18 2002-01-31 Bosch Gmbh Robert Wärmetauscher für ein Gasbrennwertgerät
DE10255464A1 (de) * 2002-11-28 2004-06-09 Robert Bosch Gmbh Wärmetauscher für ein Heizgerät
DE10306699A1 (de) * 2003-02-18 2004-09-02 Robert Bosch Gmbh Wärmetauscher mit einem strömungsoptimierten wärmeaufnehmenden Strömungskanal, insbesondere für ein Heizgerät

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Publication number Publication date
EP1703226A1 (fr) 2006-09-20
DE102005004740B3 (de) 2006-06-14

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