EP1975533A2 - Heat exchanger and condensing boiler incorporating a heat exchanger - Google Patents

Heat exchanger and condensing boiler incorporating a heat exchanger Download PDF

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Publication number
EP1975533A2
EP1975533A2 EP08200012A EP08200012A EP1975533A2 EP 1975533 A2 EP1975533 A2 EP 1975533A2 EP 08200012 A EP08200012 A EP 08200012A EP 08200012 A EP08200012 A EP 08200012A EP 1975533 A2 EP1975533 A2 EP 1975533A2
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
coil
condensing boiler
boiler
condensing
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Withdrawn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
EP08200012A
Other languages
German (de)
French (fr)
Inventor
David Buckles
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.)
G A H Heating Products Ltd
Original Assignee
G A H Heating Products 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 G A H Heating Products Ltd filed Critical G A H Heating Products Ltd
Publication of EP1975533A2 publication Critical patent/EP1975533A2/en
Withdrawn legal-status Critical Current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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
    • 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
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
    • F24H1/16—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form helically or spirally coiled
    • F24H1/165—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form helically or spirally coiled using fluid fuel
    • 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
    • F24H1/43—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water tube or tubes helically or spirally coiled
    • 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
    • F24H8/00—Fluid heaters characterised by means for extracting latent heat from flue gases by means of condensation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
    • F28D21/0007—Water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
    • 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

Definitions

  • the present invention relates to a heat exchanger that is particularly applicable for use in condensing boilers.
  • Condensing boilers (and indeed most other fuel burning systems) use heat exchangers to recover at least some of the heat from hot gasses produced when the fuel is burnt.
  • the heat exchangers increase the efficiency of the condensing boiler and are a contributor to the claims of many manufacturers that their domestic condensing boilers are up to 97% efficient.
  • FIG. 1 a An example conventional heat exchanger used in a condensing boiler is illustrated in Figure 1 a and 1 b.
  • the heat exchanger includes a coil formed about a body, the heat exchanger including gas direction means to direct the passage of gas passing through the heat exchanger to pass over the body and between the coils of the coil.
  • the body is preferably elongated, having a greater length than circumference, the coil circumscribing the body along its length.
  • the body is preferably substantially cylindrical, the coil being formed along the length of the cylinder.
  • the coil is hollow and has water passed there-through.
  • the heat exchanger is used in a heating system, the water passed through the body and coil being subsequently passed to a primary heat exchanger of the heating system for further heating.
  • the coil is formed from a ribbed tube.
  • Figure 2 is a sectional view of a heat exchanger according to an embodiment of the present invention.
  • the heat exchanger 20 includes a housing 30 (parts of which have been omitted to enable illustration of the interior of the housing 30), a body 40, a coil 50 formed about the body 40, a gas inlet 60 and a gas outlet 65.
  • Hot gasses (marked by arrows labelled 70) enter the housing 30 via gas inlet 60.
  • the body 40 and coil 50 are positioned in the housing 30 immediately in the path of the gasses 70.
  • the gasses therefore pass over the body and between the coils of the coil 50 before escaping the heat exchanger via gas outlet 65.
  • Escaping gasses moving around the body 40 and out of the housing 30 via the gas outlet 65 are marked by arrows labelled 80.
  • the coil 50 is preferably hollow and water is pumped or otherwise passed there-through from water inlet 90 to water outlet 95.
  • the body 40 is illustrated as a cylinder, it could be of any form.
  • the body 40 is elongated to present sufficient surface area for the gasses to pass around.
  • the body and/or the coil may be ribbed or otherwise include gas passage prevention means such as cavities or textures to increase the time and/or surface area of contact with the gasses and thereby improve efficiency.
  • Figure 3 is a schematic diagram of a condensing boiler according to an embodiment of the present invention.
  • Figure 4 is a sectional diagram illustrating aspects of the boiler of Figure 3 in more detail.
  • the heat exchanger 20 is mounted on a condensing boiler 100 so as to act as a secondary heat exchanger.
  • Cool water is preferably passed through the coil 50. This is heated via the heat conducted/scrubbed away from the hot gasses.
  • Water outlet 95 is connected to the boiler for further heating before passing into a heating system via outlet 150.
  • water that has passed through the heating system (radiators, hot water cylinder etc) is passed back into the secondary heat exchanger via water inlet 90 resulting in a closed system.
  • Cold air used by burner 110 is preferably drawn around the outside of the housing 30 of the secondary heat exchanger 120 to further assist in cooling the flue gasses in the boiler 100. By warming air used by the burner, efficiency improvements may be experienced over conventional arrangements.
  • the secondary heat exchanger is removable and serviceable in its entirety should the need arise.
  • the body 40 is removable for cleaning and servicing. Given the reduced number of parts and the fact that there are no narrow tubes to become blocked, it is expected that the heat exchanger 20 of the present invention will be significantly cheaper and easier to service and experience much fewer failures than known heat exchangers.

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)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

A heat exchanger (20) for a condensing boiler (100) including a coil (50) formed about a body (40), the heat exchanger (20) including gas direction means to direct the passage of gas passing through the heat exchanger (20) to pass over the body (40) and between the coils of the coil (50).

Description

    Field of the Invention
  • The present invention relates to a heat exchanger that is particularly applicable for use in condensing boilers.
    • Background to the Invention
  • Condensing boilers (and indeed most other fuel burning systems) use heat exchangers to recover at least some of the heat from hot gasses produced when the fuel is burnt.
  • The heat exchangers increase the efficiency of the condensing boiler and are a contributor to the claims of many manufacturers that their domestic condensing boilers are up to 97% efficient.
  • An example conventional heat exchanger used in a condensing boiler is illustrated in Figure 1 a and 1 b.
  • In Figure 1a and 1b, hot gasses pass through the tubes 10 of the heat exchanger and heat is conducted away via the walls of the tubes 10.
  • Whilst heat exchangers do indeed improve fuel efficiency of condensing boilers, they also introduce added complexity, further points of failure and additional components requiring servicing.
  • In the heat exchanger of Figure 1 a and 1 b, soot and other deposits will build up in the tubes 10 over time reducing its efficiency. Additionally, it is difficult to improve the efficiency of such a heat exchanger further. Whilst the introduction of more would tubes result in more surface area for conducting heat away, the necessary narrowing of the tubes to fit more within the same volume would mean it would take much less amounts of deposits to block one or more of the tubes.
  • In order to service a heat exchanger such as that illustrated in Figure 1, an engineer must remove all of the individual tubes from their housing and wash away any deposits. This is a messy and time consuming job resulting in higher servicing costs.
    • Statement of Invention
  • According to an aspect of the present invention, there is provided a heat exchanger according to claim 1.
  • The present invention seeks to provide a heat exchanger which is simpler, is more easily serviceable, and has improved efficiency over known heat exchangers.
  • In preferred embodiments, the heat exchanger includes a coil formed about a body, the heat exchanger including gas direction means to direct the passage of gas passing through the heat exchanger to pass over the body and between the coils of the coil.
  • The body is preferably elongated, having a greater length than circumference, the coil circumscribing the body along its length.
  • The body is preferably substantially cylindrical, the coil being formed along the length of the cylinder.
  • Preferably, the coil is hollow and has water passed there-through.
  • Preferably, the heat exchanger is used in a heating system, the water passed through the body and coil being subsequently passed to a primary heat exchanger of the heating system for further heating.
  • Preferably, the coil is formed from a ribbed tube.
  • According to another aspect of the present invention, there is provided a condensing boiler according to claim 7.
    • Brief Description of the Drawings
  • Embodiments of the present invention will now be described in detail, by way of example only, with reference to the accompanying drawings in which:
    • Figures 1 a and 1b are schematic diagrams illustrating selected aspects of a conventional heat exchanger used in a condensing boiler;
    • Figure 2 is a sectional view of a heat exchanger according to an embodiment of the present invention;
    • Figure 3 is a schematic diagram of a condensing boiler according to an embodiment of the present invention; and,
    • Figure 4 is a sectional view illustrating aspects of the boiler of Figure 3 in more detail.
    Detailed Description
  • Figure 2 is a sectional view of a heat exchanger according to an embodiment of the present invention.
  • The heat exchanger 20 includes a housing 30 (parts of which have been omitted to enable illustration of the interior of the housing 30), a body 40, a coil 50 formed about the body 40, a gas inlet 60 and a gas outlet 65.
  • Hot gasses (marked by arrows labelled 70) enter the housing 30 via gas inlet 60. The body 40 and coil 50 are positioned in the housing 30 immediately in the path of the gasses 70. The gasses therefore pass over the body and between the coils of the coil 50 before escaping the heat exchanger via gas outlet 65. Escaping gasses moving around the body 40 and out of the housing 30 via the gas outlet 65 are marked by arrows labelled 80.
  • The coil 50 is preferably hollow and water is pumped or otherwise passed there-through from water inlet 90 to water outlet 95.
  • It will be appreciated that although the body 40 is illustrated as a cylinder, it could be of any form. Preferably the body 40 is elongated to present sufficient surface area for the gasses to pass around. The body and/or the coil may be ribbed or otherwise include gas passage prevention means such as cavities or textures to increase the time and/or surface area of contact with the gasses and thereby improve efficiency.
  • Figure 3 is a schematic diagram of a condensing boiler according to an embodiment of the present invention. Figure 4 is a sectional diagram illustrating aspects of the boiler of Figure 3 in more detail.
  • In this embodiment of the present invention, the heat exchanger 20 is mounted on a condensing boiler 100 so as to act as a secondary heat exchanger.
  • A burner 110 fires a fuel/air mixture into the boiler 100 through a hole 111 in a primary heat exchanger 120. The resultant hot gasses from the firing of the fuel/air mixture follow the direction of the arrows 130 around baffles 140 up into the secondary heat exchanger 20. The gasses pass through the secondary heat exchanger in the same manner as discussed in Figure 2 and exit via the gas outlet 65 into a flue discharge.
  • Cool water is preferably passed through the coil 50. This is heated via the heat conducted/scrubbed away from the hot gasses. Water outlet 95 is connected to the boiler for further heating before passing into a heating system via outlet 150. Preferably, water that has passed through the heating system (radiators, hot water cylinder etc) is passed back into the secondary heat exchanger via water inlet 90 resulting in a closed system.
  • Cold air used by burner 110 is preferably drawn around the outside of the housing 30 of the secondary heat exchanger 120 to further assist in cooling the flue gasses in the boiler 100. By warming air used by the burner, efficiency improvements may be experienced over conventional arrangements.
  • It will be appreciated that the secondary heat exchanger is removable and serviceable in its entirety should the need arise. Similarly, the body 40 is removable for cleaning and servicing. Given the reduced number of parts and the fact that there are no narrow tubes to become blocked, it is expected that the heat exchanger 20 of the present invention will be significantly cheaper and easier to service and experience much fewer failures than known heat exchangers.

Claims (9)

  1. A heat exchanger including a coil formed about a body, the heat exchanger including gas direction means to direct the passage of gas passing through the heat exchanger to pass over the body and between the coils of the coil.
  2. A heat exchanger according to claim 1, wherein the body is preferably elongated, having a greater length than circumference, the coil circumscribing the body along its length.
  3. A heat exchanger according to claim 2, wherein the body is substantially cylindrical, the coil being formed along the length of the cylinder.
  4. A heat exchanger according to any preceding claim, wherein the coil is hollow and is arranged to pass water there-through.
  5. A heat exchanger according to any preceding claim, wherein the coil is formed from a ribbed tube.
  6. A heat exchanger as claimed in any preceding claim, further comprising means for drawings cold air used by a burner around the outside of the body to thereby cooling flue gasses.
  7. A condensing boiler including a heat exchanger as claimed in any preceding claim.
  8. A condensing boiler as claimed in claim 7, wherein the heat exchanger comprises a secondary heat exchanger.
  9. A condensing boiler as claimed in claim 8, wherein the body and coil are arranged to be separately removeable from the boiler.
EP08200012A 2007-03-30 2008-03-31 Heat exchanger and condensing boiler incorporating a heat exchanger Withdrawn EP1975533A2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0706271A GB2447974A (en) 2007-03-30 2007-03-30 Heat exchanger of a condensing boiler

Publications (1)

Publication Number Publication Date
EP1975533A2 true EP1975533A2 (en) 2008-10-01

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ID=38050573

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08200012A Withdrawn EP1975533A2 (en) 2007-03-30 2008-03-31 Heat exchanger and condensing boiler incorporating a heat exchanger

Country Status (2)

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EP (1) EP1975533A2 (en)
GB (1) GB2447974A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110868892A (en) * 2017-06-05 2020-03-06 路易吉·拉瓦扎股份公司 Fluid heater and corresponding machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201610729D0 (en) * 2016-06-20 2016-08-03 Evans Peter And Sallaku Arben Boiler

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH596529A5 (en) * 1975-08-14 1978-03-15 Andreas Bossart Heat exchanger for heating or cooling system
US4037567A (en) * 1976-01-15 1977-07-26 Torres Peter L Water heating system including recycle loop
US4373473A (en) * 1981-03-16 1983-02-15 110707 Canada Ltee Heat recuperating water heating system
KR950002487B1 (en) * 1992-05-12 1995-03-20 주식회사금성사 Heat exchanger for gas boiler
US20050133202A1 (en) * 2001-11-09 2005-06-23 Aalborg Industries A/S Heat exchanger, combination with heat exchanger and method of manufacturing the heat exchanger
DE10245784B4 (en) * 2002-10-01 2004-12-30 Robert Bosch Gmbh Heater and associated operating procedure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110868892A (en) * 2017-06-05 2020-03-06 路易吉·拉瓦扎股份公司 Fluid heater and corresponding machine
CN110868892B (en) * 2017-06-05 2022-03-01 路易吉·拉瓦扎股份公司 Fluid heater and corresponding machine

Also Published As

Publication number Publication date
GB2447974A (en) 2008-10-01
GB0706271D0 (en) 2007-05-09

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