EP3002527A1 - Échangeur de chaleur et chauffe-eau au gaz l'utilisant - Google Patents

Échangeur de chaleur et chauffe-eau au gaz l'utilisant Download PDF

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Publication number
EP3002527A1
EP3002527A1 EP15183990.9A EP15183990A EP3002527A1 EP 3002527 A1 EP3002527 A1 EP 3002527A1 EP 15183990 A EP15183990 A EP 15183990A EP 3002527 A1 EP3002527 A1 EP 3002527A1
Authority
EP
European Patent Office
Prior art keywords
fins
fin section
heat exchanger
burner
gas
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Withdrawn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
EP15183990.9A
Other languages
German (de)
English (en)
Inventor
Matthias Wodtke
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.)
Vaillant Wuxi Heating Equipment Co Ltd
Vaillant GmbH
Original Assignee
Vaillant Wuxi Heating Equipment Co Ltd
Vaillant GmbH
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 Vaillant Wuxi Heating Equipment Co Ltd, Vaillant GmbH filed Critical Vaillant Wuxi Heating Equipment Co Ltd
Publication of EP3002527A1 publication Critical patent/EP3002527A1/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Withdrawn legal-status Critical Current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
    • F24H1/22—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
    • 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
    • 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
    • F28F1/32—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 having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities

Definitions

  • the present invention relates to a heat exchanger, also relates to a gas water heating appliance using the heat exchanger.
  • Gas water heating appliances generally includes gas water heaters and gas boilers.
  • a typical gas water heater includes a burner, a heat exchanger, and a number of pipes connected with the heat exchanger.
  • the burner generally includes a number of blades arranged side by side, and each burner has a gas-air mixing passage defined therein. Gas and air can be introduced into the passage and mix therein, then the gas-air mixture passes through the passage and reaches burning holes disposed on top of each blade to be ignited for combustion.
  • the heat exchanger usually locates above the burner, and it can be in form of a finned tube heat exchanger. This type of heat exchanger typically includes multiple heat absorbing fins contained in a shell, and a heat absorbing pipe passing through the multiple heat absorbing fins.
  • a typical gas boiler can also offer domestic sanitary water, besides, the gas boiler is operable to heat water which is pumped around a boiler circuit that is connected to space heaters, such as radiators, so as to be used for central heating purposes.
  • Figs. 6 and 7 show a traditional staged combustion burner that consists of a number of blades 81.
  • Fig. 7 when the burner works at a minimum load, for example, a small volume of hot water is needed at this time, only a part of the blades 811 of the burner is ignited, and the heat generated is mainly absorbed by a section of the fins that is above and corresponding to this part of the blades and then transferred to water passing through the pipe 91.
  • the blades including the part 811 and the part 812 are all ignited.
  • fins 92 are uniformly distributed along a direction parallel to the side-by-side blades, as a result, the appliance can not be set to a very low minimum load. This is because, if the appliance works at a working load lower than a critical value, the moisture in the flue gas passing through the fins may be condensed, obviously, the condensed water can corrode the heat exchanger.
  • Some designers have tried to reduce the heat exchange area by reducing the density of the fins, as a result, the heat exchange efficiency is reduced, and the minimum working load can be set to a very low value without causing a condensation. However, since the heat exchange efficiency is decreased, the performance of the appliance when working at a full load is also reduced, of course, this is not desired by designers.
  • a heat exchanger comprising a plurality of fins and a heat absorbing water pipe extending through the plurality of fins.
  • the plurality of fins comprises at least a first fin section and a second fin section, wherein an average density of the fins in the second fin section is larger than an average density of the fins in the first fin section.
  • the fins in each of the first and the second fin sections are distributed uniformly.
  • the amount of the fins in the second fin section is more than the amount of the fins in the first fin section.
  • the length of the second fin section is longer than the length of the first fin section in an extending direction of the heat absorbing water pipe.
  • a gas water heating appliance comprising a burner and a heat exchanger.
  • the burner includes at least a first combustion portion and a second combustion portion, wherein said first combustion portion is ignited when the burner works at a minimum load.
  • the heat exchanger includes a plurality of fins and a heat absorbing water pipe extending through the plurality of fins.
  • the plurality of fins includes at least a first fin section and a second fin section corresponding to the first combustion portion and the second combustion portion respectively, wherein an average density of the fins in the second fin section is larger than an average density of the fins in the first fin section.
  • the fins in each of the first and the second fin sections are distributed uniformly.
  • the first fin section is positioned above and right against the first combustion portion, and the second fin section is positioned above and right against the second combustion portion.
  • the amount of the fins in the second fin section is more than the amount of the fins in the first fin section.
  • the burner includes a plurality of blades arranged side by side, and the length of the second fin section is longer than the length of the first fin section in a direction parallel to the side-by-side direction of the plurality of blades.
  • a gas water heater will be exemplified hereinafter for illustrating the gas water heating appliance of present invention.
  • Gas water heaters could be fired with combustible gas, such as natural gas, city gas, liquefied petroleum gas, methane, etc., thereby supplying hot water for domestic sanitary usage by burning the combustible gas.
  • a gas water heater 1 in accordance with one embodiment of present invention, includes a housing 50, and a burner 10, a heat exchanger 20, an exhaust gas device 30, an air supply fan 40 that are all contained in the housing 50.
  • the housing 50 may be composed of a number of plates, such as a front plate, a back plate, a top plate, a bottom plate, and a pair of side plates.
  • the housing 50 can be mounted to a wall of a building with its back plate facing the wall.
  • the burner 10 includes a burner casing (not labeled) and burner elements contained in the casing.
  • the burner elements may be constituted by a number of burner blades 11 arranged side by side.
  • Each burner blade generally defines therein a gas-air mixture passage for mixing fuel gas supplied from the gas supply pipe 53 and primary air.
  • the gas-air mixture can be delivered to top of the blade for being ignited and burning.
  • the configurations of burner blades are well known in the art, a detailed explanation is omitted for sake of brevity.
  • the burner 10 is able to work in different combustion stages.
  • the burner 10 includes a first combustion portion 111 and a second combustion portion 112.
  • the first combustion portion 111 consists of a small amount of blades 11 for being ignited when the appliance needs to work at a minimum load.
  • the burner blades 11 of the first and the second combustion portions 111, 112 are all ignited.
  • the appliance 1 has a proportional valve 13 and a gas distribution device assembly that work together with proportional valve 13 to realize various combustion stages of the burner 10.
  • the proportional valve 13 is connected with the gas supply pipe 53 to control the amount of gas supplied to the burner 10.
  • the gas distribution device assembly includes a first gas distribution device 121 for supplying gas to the first combustion portion 121 and a second gas distribution device 122 for supplying gas to the second combustion portion 122.
  • the proportional valve 13 adjusts the introduced gas in a linear proportion, and distributes it into the first gas distribution device 121 or the second gas distribution device 122 according to working load required by the appliance, then the gas together with the primary air is ejected into corresponding combustion portion of the burner 10 to be mixed and ignited.
  • the heat exchanger 20 is placed above the burner 10.
  • the heat exchanger 20 can be a finned tube heat exchanger that includes multiple heat absorbing fins 22 contained in a shell and a heat absorbing pipe 21 extending through the multiple heat absorbing fins 22.
  • An inlet tube 51 and an outlet tube 52 are positioned upstream and downstream of the heat exchanger 20, and they are connected to the heat absorbing pipe 21 for introducing cold water and discharging hot water respectively.
  • the gas-air mixture is burnt in a combustion room combined by the casing of the burner 10 and the shell of the heat exchanger 20. Heat generated by the burner 10 is absorbed by the fins 22, and the heat is further transferred to water passing through the heat absorbing pipe 21, then the heated water is extracted through the outlet tube 52 for domestic sanitary use, such as use in the kitchen, laundry, and bath.
  • the exhaust gas device 30 is placed upon the heat exchanger 20, which typically includes a hood and an discharging duct disposed on top of the hood.
  • the hood takes form of a shell mounted on top of the heat exchanger 20 for collecting flue gas (the gas may include carbon monoxide and oxides of nitrogen) generated by the burner 10 and discharging it outdoors via the discharging duct.
  • the air supply Fan 40 is provided in a lower portion of the burner 10, which is operated to supply outside air to the burner 10 as combustion air, also, force the flue gas to be discharged outdoors.
  • the heat exchanger 20 includes a first fin section 221 and a second fin section 222 corresponding to the first combustion portion 111 and the second combustion portion 112 respectively.
  • the first fin section 221 is positioned above and right against the first combustion portion 111
  • the second fin section 222 is positioned above and right against the second combustion portion 112.
  • an average density of the fins in the second fin section 222 is larger than an average density of the fins in the first fin section 221.
  • the heat exchanger of this embodiment can be regarded as a reconstruction of the conventional heat exchanger by extracting a certain amount of fins from the first fin section and then inserting them into the second fin section.
  • the density of fins in the first fin section is decreased, and the density of fins in the second fin section is increased, while the total number of fins of the heat exchanger does not change. Since the density of fins in the first fin section is decreased, the heat exchange area of the first fin section is decreased accordingly, as a result, the minimum working load of the appliance can be reduced to a lower value without causing a condensation, meanwhile, as the total number of fins does not change, the heat exchange area of the heat exchanger in this embodiment keep the same as that of a conventional heat exchanger, consequently, the heat exchange efficiency would not be reduced when the appliance works at a full load.
  • the fins in each of the first and the second fin sections 221, 222 are distributed uniformly.
  • the fins in each of the first and the second fin sections 221, 222 can be distributed unevenly, and this structure can also realize a technical advantage equivalent to or slightly worse than that of above embodiment.
  • the amount of the fins in the second fin section 222 is more than the amount of the fins in the first fin section 221; and the length of the second fin section 222 is longer than the length of the first fin section 221 in a direction parallel to the side-by-side direction of the blades 11, or in an extending direction of the heat absorbing water pipe 21.
  • the heat exchanger can be set with more sections of fins corresponding to more combustion stages of a burner.
  • the heat exchanger can also be used in a gas boiler or other gas water heating appliance.

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  • 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)
EP15183990.9A 2014-09-27 2015-09-07 Échangeur de chaleur et chauffe-eau au gaz l'utilisant Withdrawn EP3002527A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410537826.1A CN104406299A (zh) 2014-09-27 2014-09-27 热交换器和使用该热交换器的燃气热水设备

Publications (1)

Publication Number Publication Date
EP3002527A1 true EP3002527A1 (fr) 2016-04-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15183990.9A Withdrawn EP3002527A1 (fr) 2014-09-27 2015-09-07 Échangeur de chaleur et chauffe-eau au gaz l'utilisant

Country Status (2)

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EP (1) EP3002527A1 (fr)
CN (1) CN104406299A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020094731A (ja) * 2018-12-12 2020-06-18 リンナイ株式会社 熱源機
CN112032772A (zh) * 2020-08-10 2020-12-04 华帝股份有限公司 一种气源种类自适应的灶具控制方法及控制系统

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1524520A (en) * 1924-06-07 1925-01-27 Junkers Hugo Heat-exchange apparatus
NL7110630A (fr) * 1971-08-02 1973-02-06
JPS5343253U (fr) * 1977-09-14 1978-04-13
JPS56161428U (fr) * 1980-04-30 1981-12-01
JPS58193039A (ja) * 1982-05-04 1983-11-10 Osaka Gas Co Ltd 加熱装置
JPS6115044A (ja) * 1984-06-28 1986-01-23 Matsushita Electric Ind Co Ltd 熱交換器
JPS61143695A (ja) * 1984-12-17 1986-07-01 Toshiba Corp 冷却器
JPS63150585A (ja) * 1986-12-15 1988-06-23 Showa Alum Corp 蒸発器
WO2000053988A1 (fr) * 1999-03-10 2000-09-14 Bundy Corporation Evaporateur de refrigeration
US20120240868A1 (en) * 2011-03-25 2012-09-27 Miura Co., Ltd. Boiler
US20120272928A1 (en) * 2011-04-26 2012-11-01 Noritz Corporation Exhaust adapter and combustion apparatus having the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2041013U (zh) * 1988-07-06 1989-07-12 高林生 全自动燃气热水器
CN2497220Y (zh) * 2001-08-15 2002-06-26 郑国隆 具有自动分段控制装置的强制排气热水器
CN2830972Y (zh) * 2005-07-15 2006-10-25 广东万家乐燃气具有限公司 机械调温型燃气快速热水器
CN101173821B (zh) * 2006-10-30 2010-05-26 海尔集团公司 蓝火苗分段供风燃气热水器
CN202074674U (zh) * 2011-05-07 2011-12-14 美的集团有限公司 一种燃气热水器的热交换器

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1524520A (en) * 1924-06-07 1925-01-27 Junkers Hugo Heat-exchange apparatus
NL7110630A (fr) * 1971-08-02 1973-02-06
JPS5343253U (fr) * 1977-09-14 1978-04-13
JPS56161428U (fr) * 1980-04-30 1981-12-01
JPS58193039A (ja) * 1982-05-04 1983-11-10 Osaka Gas Co Ltd 加熱装置
JPS6115044A (ja) * 1984-06-28 1986-01-23 Matsushita Electric Ind Co Ltd 熱交換器
JPS61143695A (ja) * 1984-12-17 1986-07-01 Toshiba Corp 冷却器
JPS63150585A (ja) * 1986-12-15 1988-06-23 Showa Alum Corp 蒸発器
WO2000053988A1 (fr) * 1999-03-10 2000-09-14 Bundy Corporation Evaporateur de refrigeration
US20120240868A1 (en) * 2011-03-25 2012-09-27 Miura Co., Ltd. Boiler
US20120272928A1 (en) * 2011-04-26 2012-11-01 Noritz Corporation Exhaust adapter and combustion apparatus having the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020094731A (ja) * 2018-12-12 2020-06-18 リンナイ株式会社 熱源機
CN112032772A (zh) * 2020-08-10 2020-12-04 华帝股份有限公司 一种气源种类自适应的灶具控制方法及控制系统

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