EP0030183B1 - Heizkörper für mit Gas beheizte Haushaltskessel in Warmwasser-Zentralheizungen - Google Patents

Heizkörper für mit Gas beheizte Haushaltskessel in Warmwasser-Zentralheizungen Download PDF

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Publication number
EP0030183B1
EP0030183B1 EP80401656A EP80401656A EP0030183B1 EP 0030183 B1 EP0030183 B1 EP 0030183B1 EP 80401656 A EP80401656 A EP 80401656A EP 80401656 A EP80401656 A EP 80401656A EP 0030183 B1 EP0030183 B1 EP 0030183B1
Authority
EP
European Patent Office
Prior art keywords
tubes
gas
angle
fact
water
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
Application number
EP80401656A
Other languages
English (en)
French (fr)
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EP0030183A1 (de
Inventor
Guy Pompidor
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.)
Saunier Duval Eau Chaude Chauffage SDECC SA
Original Assignee
Saunier Duval Eau Chaude Chauffage SDECC SA
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 Saunier Duval Eau Chaude Chauffage SDECC SA filed Critical Saunier Duval Eau Chaude Chauffage SDECC SA
Publication of EP0030183A1 publication Critical patent/EP0030183A1/de
Application granted granted Critical
Publication of EP0030183B1 publication Critical patent/EP0030183B1/de
Expired 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
    • 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

Definitions

  • the present invention relates very particularly but not exclusively to domestic boilers for central heating with hot water by gas of the sealed type with forced draft. It relates to a new heat exchanger body which makes it possible to operate said boilers with partial or total recovery of the calories contained in the water vapor produced by the condensation of gas.
  • this water vapor is evacuated through the chimney in pure loss with the combustion products at a temperature generally between 110 ° and 250 ° C, this loss which is at least equal to the latent heat of condensation or vaporization of water vapor represents approximately 10% of the calorific value of the gas. To recover these lost calories, it is necessary to be able to condense this vapor, this is what is done in so-called condensing boilers.
  • the present invention makes it possible to avoid these drawbacks and aims to achieve a particularly simple and economical exchanger heater body for condensing boilers while creating a turbulence regime in the flow of combustion gases between the longitudinal tubes in view. to obtain higher convection heat exchange coefficients.
  • the invention relates to a heating body comprising a bundle of longitudinal tubes of elongated section arranged along the generatrix of a cylinder to form a cylindrical interior combustion chamber characterized in that the longitudinal median plane of each tubes is inclined at an angle relative to the radial direction of flow of the combustion gases in the combustion chamber to create an oblique attack of these gases on said tubes.
  • a heat exchanger body consisting of longitudinal tubes 10 with elongated section uniformly distributed along the generatrix of a cylinder so as to form a cylindrical interior chamber2 for the introduction of a burner3 also cylindrical.
  • These tubes 10 in which the water to be heated circulates are inclined at an angle a with respect to a radial direction AB of flow of the combustion gases in a cylindrical combustion chamber 2.
  • the angle of inclination a of the tubes is defined by the angle between the longitudinal median plane A l B 1 of a tube and the plane AB passing through the intersection of the median plane A l B 1 of the tube and the upstream face of this tube in the direction of gas flow.
  • This angle of inclination to tubes 10 is for example close to 30 °. But we will use an angle of inclination to the tubes greater than a limit angle ao shown in Figure 2, and obtained when a plane AB 'passing through the axis of the cylindrical combustion chamber 2 and between two longitudinal neighboring tubes 10 is tangent to these two tubes.
  • This arrangement has many advantages. First of all, it makes it possible on the one hand to create a turbulence regime in the flow of gases between the tubes 10 despite the low value of between 50 and 200 of the Reynolds number characterizing this flow of gases in order to obtain high convection coefficients and on the other hand to increase the surface of the tubes exposed to the direct radiation of the flames of the combustion chamber, so as to constitute an “optically closed” heat exchange surface.
  • the term "optically closed surface” means that a light source having as axis the axis of the combustion chamber and of the cylindrical burner is not visible directly when looking at the exterior of this exchanger, therefore from the side of the outlet of the combustion gases. We can therefore see in this case only indirect light traces emerging from the intervals between the tubes generated by the internal reflections and the diffusion of the central light source formed by the flames of the burner.
  • this arrangement due to the oblique attack of the combustion gases on the tubes increases on the one hand the thermal power exchanged by convection by the turbulence created upstream of the tubes and consequently obtained between tubes and on the other hand the thermal power exchanged by radiation by exposing a larger area of the tubes to direct radiation from the gas combustion flames.
  • elongated water tubes has been envisaged, but it is likewise possible to use oval tubes with elliptical section or tubes with rhombic section, or tubes with elongated section (oblong) with different contours on the upstream face and the downstream face, for example tubes with a section known as an orange quarter shape, or a drop shape.

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  • 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)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (4)

1. Heizkörper für gasbetriebene Haushalts-Zentralheizungskessel für Warmwasser mit Zwangsabzug, mit einem Bündel von Längsrohren mit gestrecktem Querschnitt, in welchem zu erwärmendes Wasser zirkuliert und welche gemäß der Erzeugenden eines Zylinders angeordnet sind, um eine innere zylindrische Verbrennungskammer zu bilden, dadurch gekennzeichnet, daß die Längsmittelebene A1B1 eines jeden Rohres (10) unter einem Winkel a zur Radialrichtung AB des Stroms der Verbrennungsgase geneigt ist, um ein schräges Auftreffen dieser Gase auf den Rohren zu gewährleisten.
2. Heizkörper nach Anspruch 1, dadurch gekennzeichnet, daß. die Rohre (10) eine optisch geschlossene Wärmeaustauschfläche bilden.
3. Heizkörper nach Anspruch 1, dadurch gekennzeichnet, daß der Neigungswinkel a in der Größe von 30° liegt.
4. Heizkörper nach Anspruch 1, dadurch gekennzeichnet, daß der Neigungswinkel ao größer als ein Grenzwinkel ist, welcher gebildet ist durch jede Ebene AB', die durch die Achse der zylindrischen Verbrennungskammer (2) läuft und zwischen zwei benachbarten Rohren (10) die Tangente an diese Rohre ist.
EP80401656A 1979-11-30 1980-11-19 Heizkörper für mit Gas beheizte Haushaltskessel in Warmwasser-Zentralheizungen Expired EP0030183B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7929459A FR2487956A1 (fr) 1979-11-30 1979-11-30 Corps de chauffe pour chaudieres domestiques de chauffage central a eau chaude par le gaz
FR7929459 1979-11-30

Publications (2)

Publication Number Publication Date
EP0030183A1 EP0030183A1 (de) 1981-06-10
EP0030183B1 true EP0030183B1 (de) 1984-01-18

Family

ID=9232236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80401656A Expired EP0030183B1 (de) 1979-11-30 1980-11-19 Heizkörper für mit Gas beheizte Haushaltskessel in Warmwasser-Zentralheizungen

Country Status (3)

Country Link
EP (1) EP0030183B1 (de)
DE (1) DE3066208D1 (de)
FR (1) FR2487956A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008038041A1 (de) * 2008-08-16 2010-02-25 Robert Bosch Gmbh Wärmetauscher für ein Heizgerät

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1205681B (de) * 1963-05-24 1965-11-25 Max Boehm Warmwasserheizkessel
FR1413466A (fr) * 1964-10-30 1965-10-08 Radiation Ltd Perfectionnements aux chambres de combustion pour chauffe-eau, et aux procédés de fabrication de ces chambres
GB1284642A (en) * 1970-01-08 1972-08-09 Glow Worm Ltd Improvements relating to heat exchangers and water-heating apparatus incorporating such heat exchangers
GB1578663A (en) * 1978-01-24 1980-11-05 Stelrad Group Ltd Boiler unit

Also Published As

Publication number Publication date
FR2487956B3 (de) 1982-07-23
DE3066208D1 (en) 1984-02-23
FR2487956A1 (fr) 1982-02-05
EP0030183A1 (de) 1981-06-10

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