EP0759527A1 - Echangeur de chaleur - Google Patents

Echangeur de chaleur Download PDF

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Publication number
EP0759527A1
EP0759527A1 EP96304677A EP96304677A EP0759527A1 EP 0759527 A1 EP0759527 A1 EP 0759527A1 EP 96304677 A EP96304677 A EP 96304677A EP 96304677 A EP96304677 A EP 96304677A EP 0759527 A1 EP0759527 A1 EP 0759527A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
tubes
upper header
tube
exchanger according
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Withdrawn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
EP96304677A
Other languages
German (de)
English (en)
Inventor
Paul Martin Kettle
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.)
Caradon Ideal Ltd
Original Assignee
Caradon Ideal 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 Caradon Ideal Ltd filed Critical Caradon Ideal Ltd
Publication of EP0759527A1 publication Critical patent/EP0759527A1/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Withdrawn legal-status Critical Current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
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water
    • F24H1/526—Pipes in pipe heat exchangers for sanitary water
    • 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
    • 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
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water

Definitions

  • This invention relates to heat exchangers and is mainly concerned with heat exchangers for domestic gas boilers of the type providing separate fluid flow paths for central heating water and domestic hot water for consumption, i.e. so-called 'duplex' boilers.
  • a known form of heat exchanger used in gas boilers has an upright cylindrical gas burner surrounded by an annular array of fluid carrying tubes extending between upper and lower headers or manifolds, and a casing or housing which encloses and is spaced from the tubes and upper header to define therebetween passages for flow of flue gases, a lower end of the housing being sealed to the lower header. Hot gases from the gas burner pass between the tubes underneath the upper header and then pass upwardly around and across the top of the upper header before passing out through a central flue outlet located above the upper header.
  • Heat exchangers of this construction are generally efficient and are effective for boilers having a single fluid flow path, so that water in the upper header is not static at any time during burner operation.
  • the invention addresses this problem and provides a heat exchanqer for a boiler comprising upper and lower headers with tubes extending therebetween in an annular array surrounding a combustion chamber for accommodating a gas burner, the headers and tubes defining two distinct flow paths for liquid to be heated, wherein the flow paths through the tubes are in heat exchange relationship with each other, and baffle means are provided in the upper part of the combustion chamber spaced below the upper header so that flue gases are constrained to pass outwardly from the combustion chamber between the tubes before any heat exchange with the upper header is possible.
  • each tube comprise an outer tube through which extends a coiled tube, the coiled tube constituting one flow path and the spaces within the straight tube not filled by the coiled tube defining the other flow path.
  • the known heat exchanger 1 illustrated in Figure 1 includes an upper header 2 generally cylindrical in outer form, an annular lower header 3, and several upright heat exchanger tubes 4 extending between the headers and arranged in an annular array around a combustion chamber into which extends an upright gas burner 5 connected to a fan 6 for delivering a premix of gas, e.g. natural gas (mostly methane), and air into the interior of the burner.
  • a cylindrical casing or housing 7 has its lower end sealed to the lower header 3 and surrounds the upper header 2 and the tubes 4.
  • the upper end wall 9 of the casing includes a central opening leading to a flue duct 8 which extends upwardly from the casing.
  • the headers 2,3 include chambers which communicate with the tubes 4 to define a fluid path (not shown) for the passage of water through the heat exchanger 1 from an inlet 10 to an outlet 11.
  • the water makes several passes through tubes 4 between the upper and lower headers in following this flow path.
  • Hot combustion gases from the gas burner 5 pass out between the tubes 4 for heating the water in the tubes.
  • Fins 12 are brazed to the tubes 4 to improve the efficiency of the heat exchange.
  • Hot combustion gases are prevented from rising directly to the flue outlet from the burner 5 by the upper header 2, the lower surface of which is exposed to the hot gases in the combustion chamber.
  • the upper header constrains gases to pass into a space formed outside of the tubes 4 and then to flow between the upper header 2 and the casing 5, eventually departing the heat exchanger 1 via duct 8.
  • FIGs 2 and 3 illustrate a preferred embodiment of a heat exchanger 20 according to the invention.
  • the general construction of the heat exchanger 20 is similar to the known heat exchanger of Figure 1 in that it has tubes 4 extending between upper and lower headers and arranged around a combustion chamber and within a casing.
  • the upper header 22 is annular and positioned around the flue duct 23 at the top of the casing 24 to which it is sealed and a baffle in the form of an imperforate plate 21 is mounted between the gas burner 5 and the upper end wall of the casing formed by the underside of the upper header.
  • the headers 22,3 include chambers which communicate with the tubes 4 to define two separate fluid flow paths for flows of water to be heated, the flow paths extending between respective inlets 25 and outlets 26 and each path including several passes through the tubes between the upper and lower headers.
  • a helical tube 28 defines a first fluid flow path 30, the radially outmost surface of tube 28 abutting the internal surface of the tube 4.
  • the spaces within tube 4 not filled by tube 28 define a second fluid flow path 29.
  • the two fluid flow paths 29,30 are in direct heat exchange relationship both with each other, as well as with hot combustion gases from the combustion chamber, which prevents overheating of static fluid in either flow path through the tubes 4 during boiler operation.
  • the baffle plate may be brazed to the tubes 4 in the same way as the fins 12.
  • the length of tubes 4 above the plate 21 is substantially smaller than that below the plate and only the sections of the tubes below the baffle plate are equipped with fins 12.

Landscapes

  • 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)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP96304677A 1995-08-23 1996-06-25 Echangeur de chaleur Withdrawn EP0759527A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9517278 1995-08-23
GB9517278A GB2304406A (en) 1995-08-23 1995-08-23 Preventing overheating in boiler heat exchangers

Publications (1)

Publication Number Publication Date
EP0759527A1 true EP0759527A1 (fr) 1997-02-26

Family

ID=10779661

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96304677A Withdrawn EP0759527A1 (fr) 1995-08-23 1996-06-25 Echangeur de chaleur

Country Status (2)

Country Link
EP (1) EP0759527A1 (fr)
GB (1) GB2304406A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102705989A (zh) * 2012-05-01 2012-10-03 杨斌 一种横置多层翅片换热器
CN102858863A (zh) * 2010-05-27 2013-01-02 埃西勒国际通用光学公司 制备黄度指数改进了的热塑性聚氨酯的方法和由其制造的光学制品

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19904924B4 (de) * 1999-02-06 2005-09-15 Robert Bosch Gmbh Brenner, insbesondere für Heizungsanlagen
GB2441183B (en) * 2007-04-16 2009-04-08 Enertek Internat Ltd Heat exchanger

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2100344A1 (de) * 1970-01-08 1971-07-15 Glow-Worm Ltd., Belper, Derby (Großbritannien) Wärmetauscher und unter Verwendung derartiger Wärmetauscher hergestellte Wassererhitzer
FR2439367A1 (fr) * 1978-10-19 1980-05-16 Stajic Zivojin Chaudiere de chauffage murale de petite et moyenne puissance
EP0037333A1 (fr) * 1980-03-27 1981-10-07 PAQUET THERMIQUE Société Anonyme dite Chaudière à gaz pouvant fonctionner en circuit de combustion étanche
JPS616536A (ja) * 1984-06-19 1986-01-13 Matsushita Electric Ind Co Ltd 温水ボイラ
EP0350388A1 (fr) * 1988-07-05 1990-01-10 Chaffoteaux & Maury Perfectionnements aux appareils de production d'eau chaude

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT8223093V0 (it) * 1982-10-04 1982-10-04 Ferroli Ind Riscaldamento Scambiatore di calore gas-acqua in particolare per impianti di riscaldamento centralizzato con servizio di fornitura di acquacalda ad usi igienico-sanitari.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2100344A1 (de) * 1970-01-08 1971-07-15 Glow-Worm Ltd., Belper, Derby (Großbritannien) Wärmetauscher und unter Verwendung derartiger Wärmetauscher hergestellte Wassererhitzer
FR2439367A1 (fr) * 1978-10-19 1980-05-16 Stajic Zivojin Chaudiere de chauffage murale de petite et moyenne puissance
EP0037333A1 (fr) * 1980-03-27 1981-10-07 PAQUET THERMIQUE Société Anonyme dite Chaudière à gaz pouvant fonctionner en circuit de combustion étanche
JPS616536A (ja) * 1984-06-19 1986-01-13 Matsushita Electric Ind Co Ltd 温水ボイラ
EP0350388A1 (fr) * 1988-07-05 1990-01-10 Chaffoteaux & Maury Perfectionnements aux appareils de production d'eau chaude

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 153 (M - 484) 3 June 1986 (1986-06-03) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102858863A (zh) * 2010-05-27 2013-01-02 埃西勒国际通用光学公司 制备黄度指数改进了的热塑性聚氨酯的方法和由其制造的光学制品
CN102858863B (zh) * 2010-05-27 2014-08-13 埃西勒国际通用光学公司 制备黄度指数改进了的热塑性聚氨酯的方法和由其制造的光学制品
CN102705989A (zh) * 2012-05-01 2012-10-03 杨斌 一种横置多层翅片换热器
WO2013163909A1 (fr) * 2012-05-01 2013-11-07 Yang Bin Échangeur de chaleur à ailettes multicouches disposé transversalement

Also Published As

Publication number Publication date
GB2304406A (en) 1997-03-19
GB9517278D0 (en) 1995-10-25

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