EP0508743B1 - Wärmetauscher - Google Patents

Wärmetauscher Download PDF

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Publication number
EP0508743B1
EP0508743B1 EP19920303104 EP92303104A EP0508743B1 EP 0508743 B1 EP0508743 B1 EP 0508743B1 EP 19920303104 EP19920303104 EP 19920303104 EP 92303104 A EP92303104 A EP 92303104A EP 0508743 B1 EP0508743 B1 EP 0508743B1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
fins
flueway
flueways
opposed walls
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 - Lifetime
Application number
EP19920303104
Other languages
English (en)
French (fr)
Other versions
EP0508743A1 (de
Inventor
Martin John Duckett
Michael Rackham
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.)
BLUE CIRCLE HEATING LIMITED
Original Assignee
BLUE CIRCLE HEATING 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 BLUE CIRCLE HEATING Ltd filed Critical BLUE CIRCLE HEATING Ltd
Publication of EP0508743A1 publication Critical patent/EP0508743A1/de
Application granted granted Critical
Publication of EP0508743B1 publication Critical patent/EP0508743B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F24H1/24—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
    • F24H1/30—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 being built up from sections
    • F24H1/32—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 being built up from sections with vertical sections arranged side by side

Definitions

  • This invention relates to heat exchangers and more particularly to cast heat exchangers.
  • the invention is especially applicable to such heat exchangers for use in gas or oil burning water heating/central heating appliances.
  • the hot combustion flue products from a gas or oil burner are passed over flue surfaces of a heat exchanger in which a fluid e.g. water is circulated. Heat is absorbed into the fluid contained in the heat exchanger by radiation, convection and conduction. In order to ensure that heat transfer takes place as efficiently as possible it is common to increase the surface area of the flueway by adding fins or pips which extend into the flueway.
  • a typical heat exchanger it is usual to provide a flueway of long/narrow rectangular cross-section with a plurality of adjacent fins extending inwards into the flueway from the opposed major surfaces thereof, the oppositely directed fins being staggered relative to one another.
  • a cast heat exchanger comprising a body having at least one flueway through it, and characterised in that the heat exchanger is of monobloc construction and comprises a plurality of heat exchange fins extending from each of the opposed walls of said flueway, each heat exchange fin extending into and along said flueway, the heat exchange fins from one of the opposed walls intermeshing with the heat exchange fins from the other of the opposed walls whereby they overlap over part of the length which they extend into said flueway.
  • the heat exchange fins from the opposed walls overlap over the major part of their length.
  • the spacing between one of the opposed walls and the fins extending therefrom, and the other of the opposed walls and the fins extending therefrom is substantially constant.
  • Fig. 1 of the drawings there is depicted a plan view of a prior art form of cast heat exchanger 1 of single-piece i.e. monobloc construction, which is typically of cast iron or cast aluminium, which is of generally hollow construction and has input and output ports 2 and 3 respectively for circulating a fluid e.g. water through it in order for the fluid to be heated, and which is provided with three flueways 4 each having a long/narrow rectangular cross-section, and each of which is provided with a plurality of adjacent heat exchange fins 5 which extend along the length of the flueways 4 and which extend inwards into the flueways from the major sides 6,7 thereof.
  • a fluid e.g. water
  • each flueway 4 The fins 5 extending from side 6 of each flueway 4 are staggered relative to the fins 5 extending from the opposed side 7, and a gap 8 is provided between the tips of the opposed rows of fins 5 in order that the core which is typically sand-based, used to form the finned flueways 4 during the casting process can be made robust enough to withstand the pressures placed upon it.
  • the spaces between the fins 5, especially at the tips thereof, are relatively large and it has been found necessary, in order to increase the efficiency of the heat exchanger 1, to provide a baffle in the form of a metal strip which extends across the top of the flueways 4 adjacent the tips of the fins 5, or alternatively in the form of metal rods which extend upwards through the flueways 4 adjacent the tip of each of the fins 5, as indicated at 9.
  • baffles have the effect of ensuring that flue gases passing through the flueways 4 are in the closest possible contact with the heat exchanger surface and thereby increase its efficiency.
  • baffles are not conducive to providing a heat exchanger of minimum cost and weight, and they are themselves wasteful of energy since they are heated by the flue gases but play very little part in heating the liquid being circulated through the heat exchanger.
  • Fig. 2 of the drawings there is depicted a cast heat exchanger of single-piece i.e. monobloc construction in accordance with the present invention which is of similar general construction to that of Fig. 1, but in which the input and output ports 2 and 3 are disposed in opposed corners of the heat exchanger 1, in which the flueways 4 are of generally narrower width such that four flueways 4 are provided in Fig. 2 rather than three as in Fig. 1 and in which, most importantly, the heat exchange fins 5 which extend into the flueways 4 from the opposed major surfaces 6 and 7 thereof are intermeshed and adjacent fins 5 overlap one another over the major part of their length which extends into the flueways 4 from the major surfaces 6 and 7.
  • the spaces between the fins 5 of the flueways 4 are relatively small thus ensuring that the flue gases passing through them are in very close contact with the heat exchanger surfaces thereby greatly increasing the efficiency of the heat exchanger. It is envisaged that ideally the gap constituting the actual flueway 4 in Fig. 2 will be substantially constant over its entire length.
  • the heat exchanger 1 of Fig. 2 can be constructed having a height which is about half that of the heat exchanger 1 of Fig. 1 and so has about half the weight and material content of the heat exchanger 1 of Fig. 1 and yet, because of the configuration of the flueways 4 and the fact that four flueways instead of three are provided, has a performance which exceeds that of the heat exchanger of Fig. 1.
  • the heat exchanger 1 described with reference to Fig. 2 may find general application but is especially suitable for use in gas or oil burning water heating/central heating appliances, and such appliances may be of natural or forced draught operation, and may be gravity fed or pump fed. Although such heat exchangers 1 are generally made of cast iron or cast aluminium, it is envisaged that the heat exchanger 1 of Fig. 2 may be made of any suitable material.

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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)

Claims (3)

  1. Guß-Wärmetauscher (1), der einen Körper aufweist, durch den zumindest ein Rauchgaskanal (4) geht, dadurch gekennzeichnet, daß der Wärmetauscher (1) eine Monoblockstruktur hat und eine vielzahl von Wärmetauscherrippen (5) aufweist, die sich von jeder der entgegengesetzten Wände (6, 7) des Rauchgaskanals (4) aus erstrecken, wobei sich jede Wärmetauscherrippe (5) in den Rauchgaskanal (4) und an diesen entlang erstreckt, wobei die Wärmetauscherrippen (5) von einer der entgegengesetzten Wände (6) aus mit den Wärmetauscherrippen (5) von der anderen der entgegengesetzten Wände (7) aus ineinandergreifen, wodurch sich diese an einem Teil der Länge überdecken, die sich diese in den Rauchgaskanal (4) erstrecken.
  2. Wärmetauscher nach Anspruch 1, bei dem sich die Wärmetauscherrippen (5) von den entgegengesetzten Wänden (6, 7) am Hauptteil ihrer Länge überdecken.
  3. Wärmetauscher nach Anspruch 2, bei dem der Zwischenraum zwischen der einen der entgegengesetzten Wände (6) und den Rippen (5), die sich von dieser aus erstrecken, und der anderen der entgegengesetzten Wände (7) und den Rippen (5), die sich von dieser aus erstrecken, im wesentlichen konstant ist.
EP19920303104 1991-04-09 1992-04-08 Wärmetauscher Expired - Lifetime EP0508743B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9107426 1991-04-09
GB919107426A GB9107426D0 (en) 1991-04-09 1991-04-09 Heat exchangers

Publications (2)

Publication Number Publication Date
EP0508743A1 EP0508743A1 (de) 1992-10-14
EP0508743B1 true EP0508743B1 (de) 1995-07-19

Family

ID=10692882

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920303104 Expired - Lifetime EP0508743B1 (de) 1991-04-09 1992-04-08 Wärmetauscher

Country Status (3)

Country Link
EP (1) EP0508743B1 (de)
DE (1) DE69203511T2 (de)
GB (2) GB9107426D0 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9321413D0 (en) * 1993-10-16 1993-12-08 Blue Circle Heating Ltd Gas boilers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB241264A (en) * 1924-07-14 1925-10-14 Charles Mensforth Pattison An improved boiler or water heater
DE8904487U1 (de) * 1989-04-10 1989-05-24 Buderus Heiztechnik Gmbh, 6330 Wetzlar, De

Also Published As

Publication number Publication date
GB9107426D0 (en) 1991-05-22
GB2254680B (en) 1995-01-25
GB2254680A (en) 1992-10-14
GB2254680A8 (en)
GB9207644D0 (en) 1992-05-27
DE69203511T2 (de) 1996-01-04
DE69203511D1 (de) 1995-08-24
EP0508743A1 (de) 1992-10-14

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