EP0213792A2 - Wärmetauscher - Google Patents

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Publication number
EP0213792A2
EP0213792A2 EP86306048A EP86306048A EP0213792A2 EP 0213792 A2 EP0213792 A2 EP 0213792A2 EP 86306048 A EP86306048 A EP 86306048A EP 86306048 A EP86306048 A EP 86306048A EP 0213792 A2 EP0213792 A2 EP 0213792A2
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
heat exchange
exchange tube
heat
fins
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Withdrawn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
EP86306048A
Other languages
English (en)
French (fr)
Other versions
EP0213792A3 (de
Inventor
Michael John Edmundson
Ian Townsend Grundy
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.)
Baxi Partnership Ltd
Original Assignee
Baxi Partnership Ltd
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 Baxi Partnership Ltd filed Critical Baxi Partnership Ltd
Publication of EP0213792A2 publication Critical patent/EP0213792A2/de
Publication of EP0213792A3 publication Critical patent/EP0213792A3/de
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation

Definitions

  • This invention relates to heat exchangers for use especially but not exclusively to heat exchangers for use in gas fired appliances.
  • Such heat exchangers as is well known are employed to provide domestic hot water supplies and/or hot water central heating.
  • heat exchangers comprise at least two parallel heavy cast-iron hollow heat exchanger chambers coupled together for liquid flow therebetween and coupled also to water inlet and water outlet manifolds and piping.
  • the hot gases pass from the gas burner or burners up between the heat exchanger chambers to a flue system, heat being transferred from the hot gases to the water flowing through the heat exchanger.
  • a heat exchanger for use especially but not exclusively in a gas fired appliance, the heat exchanger being of unitary construction and comprising a water inlet manifold and a water outlet manifold interconnected in water flow communicating relationship by at least one externally-finned heat exchange tube.
  • Such a heat exchanger is therefore of single pass configuration.
  • the heat exchanger be multi-pass, either parallel or series flow.
  • a preferred heat exchanger thus consists of three parallel externally-finned heat exchanger tubes integral with the end manifolds.
  • the aforesaid triple pass heat exchanger preferably has parallel water flow between the end manifolds.
  • the water flow may alternatively be series flow.
  • the heat exchanger is preferably but not exclusively formed of cast-iron and is preferably but not exclusively formed using a green sand moulding process.
  • the fins are disposed as closely together as is possible within the limitations of the moulding process and the fins are preferably of radiussed configuration and also of converging configuration both transversely and axially of the respective heat exchanger tube to facilitate the moulding process.
  • the water flow passage of the or each heat exchange tube may be of oval configuration. Alternatively, it is circular.
  • turbulence-creating means ensuring re-mixing of combustion products of different temperature in the region of the heat exchange tube to improve the heat transfer qualitites of the heat exchanger.
  • stirring turbulent-­ creating baffle or pin between each pair of adjacent fins of a respective heat exchange tube.
  • the baffles are preferably provided by a substantially curved or U-shaped strip of metal formed with parallel slots and mounted between the end manifolds parallel with the heat exchange tube or tubes to accommodate a fin in each slot.
  • the stirrer pins are preferably carried by an arcuate mounting strip (single or double arc) mounted between the end manifolds parallel with the heat exchange tubes.
  • the aforesaid heat exchanger when fitted in a gas-fired appliance can be employed with a conventional burner arrangement and a conventional flue arrangement.
  • a burner arrangement be employed in which the primary and secondary air inlets are separated, preferably by an insulated wall whereby the spread of secondary air is not affected and so an even burning is produced thus giving better combustion.
  • the heat exchanger 10 is a one-piece moulded cast-iron structure, preferably manufactured, as aforesaid by a green sand moulding process known per se and therefore not described in detail.
  • the heat exchanger 10 comprises an end water inlet manifold 11 and an end water outlet manifold 12 to which piping (not shown) would be appropriately connected.
  • the two end manifolds 11 and 12 are connected by three identical parallel heat exchange tubes 13 in water flow communication with the manifolds 11, 12.
  • the water flow is indicated by arrows A and B and, in this embodiment, is parallel through the tubes 13.
  • Each tube 13 comprises a passage 14 of oval cross-section with external fins 15 disposed as closely as possible together within the limits of the moulding process.
  • finned heat exchange tube An example of a preferred surface area of finned heat exchange tube is 218400 square millimetres.
  • the fins 15 are radiussed as indicated at R, and are of slightly converging configuration transversely as indicated at TR and axially as indicated at AX to facilitate the moulding process.
  • Such means 17 comprises either a single arcuate strip 18 or a double-arcuate strip 19 fitted parallel with the heat exchange chambers 13 and having stirring pins 20 extending therefrom into the adjacent inter-fin spaces.
  • a preferred turbulance-creating means is shown in Fig. 6 and comprises a substantially U-shaped strip 21 with the limbs turned out at 22, the strip having a series of parallel slots 23, each to receive therewithin a fin 15 with the inter-slot metal 24 assisting the creating of turbulence in, and so re-mixing, the combustion products passing through the slots 23.
  • the fin design employed in the heat exchanger allows this closeness of pitch between fins using especially but not exclusively a cast iron casting formed by a green moulding process.
  • the heat transfer properties of the heat exchanger are further improved due to the aforesaid turbulence-creating means.
  • the gas-fired appliance 16 comprises a casing 25 with an exhaust gas flue system 26, and a gas burner arrangement 27 within the casing 25 below the heat exchanger 10.
  • the gas supply to the burner is indicated at 28.
  • Primary and secondary air supplies 29 and 30 are separately delivered to the appliance 16 as shown, the supplies being separated by an insulating wall 31. This ensures that the spread of secondary air is not affected by the incoming primary air and so even burning is produced and therefore better combustion.
  • This burner system as aforesaid gives improved combustion (a better CO/CO2 ratio) than has been possible hitherto.

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)
  • Details Of Fluid Heaters (AREA)
EP86306048A 1985-08-08 1986-08-05 Wärmetauscher Withdrawn EP0213792A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8519942 1985-08-08
GB858519942A GB8519942D0 (en) 1985-08-08 1985-08-08 Heat exchangers

Publications (2)

Publication Number Publication Date
EP0213792A2 true EP0213792A2 (de) 1987-03-11
EP0213792A3 EP0213792A3 (de) 1988-10-12

Family

ID=10583511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86306048A Withdrawn EP0213792A3 (de) 1985-08-08 1986-08-05 Wärmetauscher

Country Status (2)

Country Link
EP (1) EP0213792A3 (de)
GB (2) GB8519942D0 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0823599A2 (de) 1996-07-29 1998-02-11 Robert Bosch Gmbh Gasbeheizter Wassererhitzer
WO2005064259A1 (en) * 2003-12-31 2005-07-14 Giannoni S.P.A. Heat exchanger for water-heating apparatuses
CN104061683A (zh) * 2014-06-14 2014-09-24 广东万和新电气股份有限公司 燃气锅炉铸铝换热器
EP3537085A1 (de) * 2018-03-07 2019-09-11 United Technologies Corporation Verbundener plattenstapel in gegossenem plattenlamellenwärmetauscher

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206189A (en) * 1987-06-24 1988-12-29 Baxi Partnership Ltd Finned heat exchanger tubes
GB2307037B (en) * 1995-11-07 2000-02-16 Caradon Ideal Ltd Heat exchanger baffle
US6997247B2 (en) * 2004-04-29 2006-02-14 Hewlett-Packard Development Company, L.P. Multiple-pass heat exchanger with gaps between fins of adjacent tube segments

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB440168A (en) * 1934-06-06 1935-12-06 George Wilfrid Trotter Improvements relating to boilers
GB591977A (en) * 1945-05-07 1947-09-03 William Edmund Dennison Improvements in or relating to fire-back boilers for open fire-places
GB864277A (en) * 1958-08-02 1961-03-29 Glow Worm Boilers Ltd Improvements relating to water heaters for domestic hot water systems
GB1123437A (en) * 1965-11-11 1968-08-14 Ernest Leslie Hovey Improvements relating to water heating boilers
DE2036012A1 (de) * 1970-07-21 1972-01-27 Reynolds, Spencer E., Murrysville, Pa. (V.St-A.) Heizkörperabschnitt, insbesondere für Gasheizungen mit Wasser als Wärmeträger
BE789060A (de) * 1971-09-21 1973-03-20 Raypak Produkten Nv
GB1536146A (en) * 1975-06-28 1978-12-20 Valor Newhome Ltd Heat exchanger for a gas-fired appliance

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0823599A2 (de) 1996-07-29 1998-02-11 Robert Bosch Gmbh Gasbeheizter Wassererhitzer
EP0823599A3 (de) * 1996-07-29 1999-03-10 Robert Bosch Gmbh Gasbeheizter Wassererhitzer
WO2005064259A1 (en) * 2003-12-31 2005-07-14 Giannoni S.P.A. Heat exchanger for water-heating apparatuses
CN104061683A (zh) * 2014-06-14 2014-09-24 广东万和新电气股份有限公司 燃气锅炉铸铝换热器
EP3537085A1 (de) * 2018-03-07 2019-09-11 United Technologies Corporation Verbundener plattenstapel in gegossenem plattenlamellenwärmetauscher

Also Published As

Publication number Publication date
GB8619112D0 (en) 1986-09-17
GB8519942D0 (en) 1985-09-18
EP0213792A3 (de) 1988-10-12
GB2180045A (en) 1987-03-18
GB2180045B (en) 1989-09-06

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Inventor name: GRUNDY, IAN TOWNSEND

Inventor name: EDMUNDSON, MICHAEL JOHN