EP0570201A1 - Heat exchanger for a gas boiler - Google Patents
Heat exchanger for a gas boiler Download PDFInfo
- Publication number
- EP0570201A1 EP0570201A1 EP93303652A EP93303652A EP0570201A1 EP 0570201 A1 EP0570201 A1 EP 0570201A1 EP 93303652 A EP93303652 A EP 93303652A EP 93303652 A EP93303652 A EP 93303652A EP 0570201 A1 EP0570201 A1 EP 0570201A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating
- heat
- tube
- heat exchanger
- 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.)
- Withdrawn
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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
- F24H1/34—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water chamber arranged adjacent to the combustion chamber or chambers, e.g. above or at side
-
- 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
-
- 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
- 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
Abstract
A heat exchanger for a gas boiler, having a simple structure and increased heat-exchanging efficiency, has a heating tube 13 wound into a spiral and having a plurality of heat-exchanging fins 13a formed thereon by rolling. At least one hot water tube 14 may be installed inside the heating tube, to perform both space heating and water heating in a compact structure. The outer peripheral surface of the hot water tube may be carved in a spiral form so that space heating water has a turbulent flow.
Description
- The present invention relates to a heat exchanger, and more particularly to a heat exchanger for a gas boiler which can reduce manufacturing processes and improve the heat-exchanging efficiency thereof by simplifying its structure.
- A gas boiler is a heating system for domestic use, e.g., for space heating and/or for water heating purposes and is normally provided with a burner and a heat exchanger as the main parts that determine the characteristics and design of the gas boiler. Accordingly, there has been a great effort in developing such main parts in order to provide a compact, efficient, easily produced and inexpensive gas boiler.
- A conventional heat exchanger for a gas boiler, as shown in Figs. 1A and 1B, comprises a plurality of
heating tubes 3 arranged around the periphery of acylindrical gas burner 2 which is vertically mounted on the inner central part of abody 1 of the heat exchanger and has a plurality offlame nozzles 2a, and a plurality of heat-exchanging fins 4 vertically welding-fixed on the outside of theheating tubes 3 at regular intervals so as to increase the heat-exchanging area. - The gas boiler is also provided with a bottom 5 for supporting the
heating tubes 3 and connecting heating water passages, being installed at the lower part of thebody 1, a header 6 for providing passages of the heating water flowing from the lower part of thebody 1, being installed at the upper part thereof, and a baffle 7 for partitioning the inner space of the header 6 to enable the heating water to flow smoothly, being installed inside the header 6. - Further, two
pipes 8 and 9 installed at the lower part of the bottom 5 and coupled to external pipes (not illustrated) to provide water inlet and outlet channels, aceramic heater 10 for igniting mixed gas, which is installed adjacent to thecylindrical gas burner 2, and afan 11 for supplying mixed gas to be in combustion into thegas burner 2, installed at the lower part of thegas burner 2, are also provided. - Operation of the conventional heat exchanger constructed as above will now be explained as follows.
- When the mixed gas composed of fuel gas and air supplied by
fan 11 is drawn intogas burner 2, andceramic heater 10 is supplied with electric power source to be heated to an ignition point, the supplied mixed gas becomes in combustion. At this time, water supplied throughinlet pipe 8 is gathered in bottom 5, divided through a plurality ofheating tubes 3, and then gathered at the inner space of header 6, thereby exchanging heat with high temperature combustion gas burned atgas burner 2. That is, the high temperature combustion gas burned atgas burner 2 transmits heat to a plurality ofheating tubes 3, a plurality of heat-exchangingfins 4 and the water which flows throughheating tubes 3, thereby heating the water. - The water gathered in the inner space of header 6 in this way passes through
heating tubes 3 again, along the passage formed by baffle 7, exchanging heat once more, and is then exhausted to the external pipe through outlet pipe 9. - However, the conventional heat exchanger as described above has a problem in that a plurality of heat-exchanging
fins 4 for increasing the heat transmission area must be welding-fixed in order to adhere closely about the periphery ofheating tubes 3 installed aroundcylindrical gas burner 2. Also, bottom 5 and header 6 for forming water passages must be respectively welding-fixed at the lower and upper part ofheating water tubes 3 in order not to leak water, so that the overall structure is complicated and manufacturing processes and costs are increased. Moreover, when a plurality of heat-exchangingfins 4 are welding-fixed to a plurality ofheating water tubes 3, perfect adhesion cannot be practically obtained. Accordingly, it is difficult to perform fixing-work of a regular interval (usually 3-4mm interval) and thus it is impossible to examine the array accuracy of heat-exchangingfins 4. Therefore, heat-exchanging efficiency is degraded. - The present invention has been made to overcome the problems involved in the prior art. It is an object of the present invention to provide a heat exchanger for a gas boiler which can reduce the mannfacturing processes and costs and improve the heat-exchanging efficiency by simplifying the structure of the heat exchanger.
- According to the present invention, there is provided a heat exchanger for a gas boiler having a gas burner, comprising:
a tube for heating space-heating water, the tube being wound into a spiral, centering around the gas burner with a predetermined distance therefrom, and having a plurality of heat-exchanging fins formed on the outer peripheral surface of the tube. - The above object and other advantages of the present invention will become more apparent by describing the preferred embodiment thereof with reference to the accompanying drawings, in which:
- Fig. 1A is a partially-sectioned perspective view of the conventional heat exchanger for a gas boiler.
- Fig. 1B is a cross-sectional view taken along the line A-A in Fig. 1A.
- Fig. 2A is a longitudinal cross-sectional view showing an embodiment of a heat exchanger for a gas boiler according to the present invention.
- Fig. 2B is a cross-sectional view taken along the line B-B in Fig. 2A.
- Fig. 3 is a detailed cross-sectional view of C part in Fig. 2B, showing the structures of a heating tube and a hot-water tube according to the embodiment of the present invention.
- With reference to Figs. 2A, 2B and 3,
cylindrical gas burner 12 having a plurality offlame nozzles 12a is vertically mounted on the inner central part ofbody 11, andheating tube 13 having a plurality of heat-exchangingfins 13a formed thereon is wound into a spiral, centering about the periphery ofgas burner 12 with a predetermined distance fromgas burner 12. - In the embodiment of the present invention,
hot water tube 14 for exchanging heat with hot water is installed insideheating tube 13 for hot water supply, whileheating tube 13 is for space heating. -
Cylindrical gas burner 2 is fixed on burner-fixing plate 11a ofbody 11 by a plurality ofscrews 15.Heating tube 13 is arranged around the periphery ofgas burner 12 in a spiral form, being fixed on burner-fixing plate 11a. - In particular, a plurality of heat-exchanging
fins 13a are formed on the outer peripheral surface ofheating tube 13, while the height of eachfin 13a and the interval between eachfin 13a are made to be constant by a rolling (screw thread rolling) process. - Moreover, it is desirable that the outer peripheral surface of
hot water tube 14 installed insideheating tube 13 is carved in a spiral form so that the heating water has a turbulent flow and thus flows smoothly, thereby increasing the heat transmission area and improving heat-exchanging efficiency. - Furthermore, at the ends of
coupling pipes heating tube 13,inlet nipple 18 which is composed of heating water inlet 18a andhot water inlet 18b, andoutlet nipple 19 which is composed ofheating water outlet 19a andhot water outlet 19b are formed, respectively. - At the upper side of
body 11,adiabatic vessel 20 is installed to prevent the combustion gas from being directly expelled throughexhaust port 23 which is connected toheating tube 13 and installed at the top ofbody 11, bycoupling tubes adiabatic vessel 20. -
Ignition plug 24 is installed to be adjacent tocylindrical gas burner 12, andfan 25 for supplying the mixed gas intogas burner 12 is installed at the lower side ofburner 12. - The operation of the heat exchanger according to the present invention constructed as above will be described in detail.
- When the mixed gas is supplied into
gas burner 12 byfan 25 coupled toburner 12 andignition plug 10 is supplied with the electric power source, the supplied mixed gas is immediately ignited and burned. The combustion gas passes through spaces between each of heat-exchangingfins 13a formed onheating tube 13 which surroundsburner 12, transmitting heat thereto, and then is exhausted throughexhaust port 23. - At this time, the heating water and hot water supplied from
inlet nipple 18 flow to the upper part ofbody 11 throughheating tube 13 andhot water tube 14, respectively, exchanging heat with the combustion gas. The heating water and hot water then flow down to the lower part ofbody 11 throughcoupling pipe 17 and are respectively exhausted to the external pipes throughoutput nipple 19. - In the embodiment, since the outer peripheral surface of
hot water tube 14 installed insideheating tube 13 is carved in a spiral form, turbulent flow occurs in the heating water, thereby improving the heat transmission effect. The length of theheating tube 13 is determined according to the input amount of heat, which can be obtained by the following expression:
where, Q: input amount of heat (Kcal/h),
U: heat transmission coefficient (Kcal/h·m²· °C),
A: heat transmission area (m²), and
Δ Tm: algebraic average temperature difference (°C). - If any input amount of heat (Q) is determined, the heat transmission area (A) suitable for the determined amount of heat is obtained by the above expression. Thereafter, the length of
heating tube 13 can be obtained by converting the heat tramsmission area (A). - In particular, since heat-exchanging
fins 13a are formed on the periphery ofheating tube 13 by a rolling process, it is possible to reduce the height of heat-exchangingfin 13a from 3-4 millimeters to 2 millimeters or less, while the number thereof can be increased. Accordingly, it is possible to increase the heat transmission area, whereas the length ofheating tube 13 can be shorter. Further, it is possible to solve the corrosion problem due to the high heat-exchangingfin 13a of the conventional apparatus and to make the pitch of the heat-exchangingfin 13a shorter. - From the foregoing, it will be apparent that the heat exchanger for a gas boiler according to the present invention has a simpler structure and reduced manufacturing processes, in comparison with the conventional heat exchanger, by reason of the heating tube having heat-exchanging fins formed thereon and wound into a spiral. Practically, the present heat exchanger achieves a reduction of manufacturing cost of over 30 percent compared with the conventional heat exchanger as well as achieving an improvement in working efficiency. Moreover, the present heat exchanger can perform both space heating and water heating even in a compact-structured heat exchanger by installing the heating hot water tube inside the heating tube. Furthermore, the outer peripheral surface of the hot water tube is carved in a spiral form to make the heating water flow turbulently and thus the heat-exchanging efficiency is much improved.
Claims (5)
- A heat exchanger for a gas boiler having a gas burner, comprising:
a tube (13) for heating space-heating water, said heating tube being would into a spiral, centering around said gas burner (12) with a predetermined distance therefrom, and having a plurality of heat-exchanging fins (13a) formed on the outer peripheral surface of said heating tube. - A heat exchanger as claimed in claim 1, wherein said plurality of heat-exchanging fins are formed on the outer peripheral surface of said heating tube by a rolling process.
- A heat exchanger as claimed in claim 1 or 2, further comprising at least one hot water tube (14) installed inside said heating tube.
- A heat exchanger as claimed in claim 3, wherein the outer peripheral surface of said hot water tube is carved in a spiral form, whereby said space-heating water has a turbulent flow and flows smoothly.
- A heat exchanger as claimed in claim 4, wherein the outer peripheral surface of said hot water tube is carved in a spiral form by a rolling process.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019920008010A KR950002487B1 (en) | 1992-05-12 | 1992-05-12 | Heat exchanger for gas boiler |
KR801092 | 1992-05-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0570201A1 true EP0570201A1 (en) | 1993-11-18 |
Family
ID=19332990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93303652A Withdrawn EP0570201A1 (en) | 1992-05-12 | 1993-05-12 | Heat exchanger for a gas boiler |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0570201A1 (en) |
JP (1) | JPH0642812A (en) |
KR (1) | KR950002487B1 (en) |
CN (1) | CN1079811A (en) |
RU (1) | RU2069294C1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998020287A1 (en) * | 1996-11-01 | 1998-05-14 | Cooperatieve Inkoopvereniging 'coopra-Rotterdam' N.V. | Heating apparatus and method for operation thereof |
US6152086A (en) * | 1997-11-03 | 2000-11-28 | Cooperatieve Inkoopvereniging | Heating apparatus and method for operation thereof |
EP0845640B1 (en) * | 1996-11-28 | 2003-04-09 | Nefit Buderus B.V. | Cylindrical heating installation with helical heat exchanger |
EP1348914A1 (en) | 2002-03-28 | 2003-10-01 | Nefit Buderus B.V. | Heat exchanger, combustion apparatus having a heat exchanger, closure member for use in such a heat exchanger, and method for making a heat exchanger |
GB2447974A (en) * | 2007-03-30 | 2008-10-01 | Rbr Associates Ltd | Heat exchanger of a condensing boiler |
EP2467651A2 (en) * | 2009-08-18 | 2012-06-27 | Sridhar Deivasigamani | Coil tube heat exchanger for a tankless hot water system |
GB2551600A (en) * | 2016-06-20 | 2017-12-27 | Evans Peter | Boiler |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20022365A1 (en) * | 2002-11-07 | 2004-05-08 | Riello Spa | BOILER |
US7428883B2 (en) | 2004-05-11 | 2008-09-30 | Noritz Corporation | Heat exchanger and water heater |
KR100978811B1 (en) * | 2008-11-28 | 2010-08-30 | 린나이코리아 주식회사 | Heat exchanger |
KR100916997B1 (en) * | 2009-03-05 | 2009-09-14 | 한국기계연구원 | Heat exchange pipe unit |
CN103062749A (en) * | 2013-01-29 | 2013-04-24 | 山西省第二建筑工程公司 | Method for improving heat efficiency of gas boiler |
KR101475398B1 (en) * | 2013-04-25 | 2014-12-22 | 주식회사 두발 | Mixing tube boiler heat exchanger |
CN104061683A (en) * | 2014-06-14 | 2014-09-24 | 广东万和新电气股份有限公司 | Cast aluminum heat exchanger of gas-fired boiler |
FR3047549B1 (en) * | 2016-02-09 | 2019-05-10 | Sermeta | DEFLECTOR FOR CONDENSED HEAT EXCHANGER AND EXCHANGER PROVIDED WITH SUCH DEFLECTOR |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2253493A1 (en) * | 1971-11-03 | 1973-05-10 | Steam Engines Systems Corp | HEAT EXCHANGER |
EP0385700A1 (en) * | 1989-02-28 | 1990-09-05 | Michael John Nunnerley | Heat exchange unit, heat exchange system, method of improving heat exchange efficiency, and refrigeration circuit |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5939215B2 (en) * | 1978-02-22 | 1984-09-21 | 株式会社神戸製鋼所 | Method for manufacturing heat exchanger tubes |
-
1992
- 1992-05-12 KR KR1019920008010A patent/KR950002487B1/en not_active IP Right Cessation
-
1993
- 1993-05-11 JP JP5132540A patent/JPH0642812A/en active Pending
- 1993-05-11 RU RU9393005179A patent/RU2069294C1/en active
- 1993-05-12 CN CN93105533.4A patent/CN1079811A/en active Pending
- 1993-05-12 EP EP93303652A patent/EP0570201A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2253493A1 (en) * | 1971-11-03 | 1973-05-10 | Steam Engines Systems Corp | HEAT EXCHANGER |
EP0385700A1 (en) * | 1989-02-28 | 1990-09-05 | Michael John Nunnerley | Heat exchange unit, heat exchange system, method of improving heat exchange efficiency, and refrigeration circuit |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 12, no. 315 (M-735)26 August 1988 & JP-A-63 087 597 ( SAKUSHIYON GAS KIKAN SEISAKUSHO:KK ) 18 April 1988 * |
PATENT ABSTRACTS OF JAPAN vol. 9, no. 307 (M-435)4 December 1985 & JP-A-60 144 595 ( MITSUBISHI JUKOGYO KK ) 30 July 1985 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998020287A1 (en) * | 1996-11-01 | 1998-05-14 | Cooperatieve Inkoopvereniging 'coopra-Rotterdam' N.V. | Heating apparatus and method for operation thereof |
NL1004410C2 (en) * | 1996-11-01 | 1998-05-14 | Cooperatieve Inkoopvereniging | Heater and method for operating it. |
KR100557803B1 (en) * | 1996-11-01 | 2006-08-30 | 코퍼라티브 인코페어에니힝 " 코프라-로테르담" 엔.브이. | Heating apparatus and method for operation thereof |
EP0845640B1 (en) * | 1996-11-28 | 2003-04-09 | Nefit Buderus B.V. | Cylindrical heating installation with helical heat exchanger |
US6152086A (en) * | 1997-11-03 | 2000-11-28 | Cooperatieve Inkoopvereniging | Heating apparatus and method for operation thereof |
EP1348914A1 (en) | 2002-03-28 | 2003-10-01 | Nefit Buderus B.V. | Heat exchanger, combustion apparatus having a heat exchanger, closure member for use in such a heat exchanger, and method for making a heat exchanger |
GB2447974A (en) * | 2007-03-30 | 2008-10-01 | Rbr Associates Ltd | Heat exchanger of a condensing boiler |
EP2467651A2 (en) * | 2009-08-18 | 2012-06-27 | Sridhar Deivasigamani | Coil tube heat exchanger for a tankless hot water system |
EP2467651A4 (en) * | 2009-08-18 | 2014-04-23 | Intellihot Inc | Coil tube heat exchanger for a tankless hot water system |
GB2551600A (en) * | 2016-06-20 | 2017-12-27 | Evans Peter | Boiler |
WO2017220999A1 (en) * | 2016-06-20 | 2017-12-28 | Peter Evans | Boiler |
GB2551600B (en) * | 2016-06-20 | 2019-05-22 | Evans Peter | Boiler having an aligned heating element arrangement |
Also Published As
Publication number | Publication date |
---|---|
JPH0642812A (en) | 1994-02-18 |
CN1079811A (en) | 1993-12-22 |
KR930023664A (en) | 1993-12-21 |
KR950002487B1 (en) | 1995-03-20 |
RU2069294C1 (en) | 1996-11-20 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR NL |
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17P | Request for examination filed |
Effective date: 19931018 |
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17Q | First examination report despatched |
Effective date: 19941214 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19960430 |