EP0295967A2 - Dispositif pour chauffer indirectement un liquide - Google Patents

Dispositif pour chauffer indirectement un liquide Download PDF

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Publication number
EP0295967A2
EP0295967A2 EP88305611A EP88305611A EP0295967A2 EP 0295967 A2 EP0295967 A2 EP 0295967A2 EP 88305611 A EP88305611 A EP 88305611A EP 88305611 A EP88305611 A EP 88305611A EP 0295967 A2 EP0295967 A2 EP 0295967A2
Authority
EP
European Patent Office
Prior art keywords
tank
reservoir
central region
region
liquid
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.)
Granted
Application number
EP88305611A
Other languages
German (de)
English (en)
Other versions
EP0295967A3 (en
EP0295967B1 (fr
Inventor
Geoffrey Lund Finney
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0295967A2 publication Critical patent/EP0295967A2/fr
Publication of EP0295967A3 publication Critical patent/EP0295967A3/en
Application granted granted Critical
Publication of EP0295967B1 publication Critical patent/EP0295967B1/fr
Expired 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
    • F24H1/18—Water-storage heaters
    • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
    • F24H1/205—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes with furnace 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
    • F24H9/12—Arrangements for connecting heaters to circulation pipes
    • F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
    • F24H9/133—Storage heaters

Definitions

  • This invention relates to an indirect liquid heating system and particularly, although not exclusively, to such a system used for the heating of raw water.
  • the indirect heating of raw water is effected by locating the heat source in a combustion chamber in or under the tank or reservoir into which cold water is introduced and from which heated water is withdrawn.
  • the products of combustion of the heat source are preferably taken through the water in the tank or reservoir, through one or more vertical tubes which extend from a generally flat area of the bottom of the tank or reservoir to a smoke box above it, and from thence to a flue or chimney.
  • Turbulators may be included in the tube or tubes to break up laminar flow of the combustion gases and enhance heat transfer to the ambient water.
  • a principal object of the present invention is to provide an improved solution to the problem of the deposition of scale, or like precipitate, on the part of a heat exchanger directly subjected to the heat e.g. of a fuel gas burner.
  • an indirect liquid heating system comprising a tank or reservoir having liquid inlet and outlet means and heating means isolated by a combustion chamber from the interior of the tank or reservoir, wherein an upper region of the combustion chamber vertically above the heating means slopes upwardly toward the liquid inlet, the arrangement being such that solids such as scale precipitated from the liquid and shed from said sloping region will fall to a position laterally offset with respect to the heating means, and wherein said inlet means extends downwardly within the tank or reservoir to open in proximity with said sloping region such that the inlet is restricted locally to increase the speed and pressure of liquid entering the tank or reservoir.
  • a system in accordance with the invention thus combines two features which respectively inhibit the formation of scale, by locally accelerating the incoming liquid and increasing its pressure, and ensure that scale or other precipitate which is formed will not accumulate directly above the heating means.
  • the said sloping region forms part of the bottom of the tank or reservoir.
  • the said sloping region is preferably constituted by a central region of the bottom of the tank or reservoir, which central region is downwardly concave and reduces in cross-sectional area upwardly to a top aligned with the orifice of the liquid inlet, whereby inflowing liquid is distributed substantially over the whole surface of said central region presented inwardly of the tank or reservoir.
  • This central region may be dome-shaped, generally conical or pyramidal.
  • the mean angular relation to the horizontal of any side of said central region is preferably an acute angle in excess of 50 degrees. If the central region is pyramidal, the apex of the pyramid may divide the orifice into a plurality of separate, approximately D-shaped openings.
  • the heating means may be a gas burner and there may extend upwardly from said sloping region within the tank or reservoir at least one outlet for combustion gases which extends to a smoke box above the tank or reservoir.
  • An annular array of circumferentially spaced combustion gas outlet tubes may extend upwardly from said central region from a horizontal plane intermediate its top and bottom.
  • each outlet tube therefor may be obstructed by formations on or in the tubes so as to promote heat transfer to the surrounding water.
  • the water heating system illustrated comprises a tank or reservoir 20 having a peripheral wall 9 closed at its bottom end by a bottom plate 21 and at its top of a top plate 22.
  • the tank has a hot water outlet 7 and cold water is introduced through a generally central inlet pipe 5 which extends downwardly into the tank 20 from an inlet connection 6 on one side of a smoke box 10 above the tank.
  • a combustion chamber 23 Beneath the bottom plate 21 of the tank is a combustion chamber 23 in which a burner 1 for a mixture of fuel gas and air is located.
  • Gas burners are well known per se so that the burner 1 will not be particularly described except to say that it is preferably of the naturally-aspirated type, i.e. that air to be mixed with the burning fuel gas is not supplied under pressure. Flame from the burner 1 plays on the bottom of the tank 20 and the products of combustion are taken through an array of heat exchanger tubes 2 to the smoke box 10 above the tank, and thence vented through a flue 8.
  • each tube 2 transfer heat to the ambient water and to promote this the flow of combustion gases through each tube 2 is preferably interrupted or obstructed either by the provision in each tube 2 of a turbulator (not shown) or by giving each tube 2 a dimpled configuration through the provision of alternately inwardly and outwardly projecting areas 4.
  • a central region 3 of top plate 21 of the combustion chamber 23, also constituting the bottom plate of the tank 20, is not flat but generally conical.
  • This downwardly concave formation 3 is immediately above the burner 1 and tapers to an apex or point 24 which extends into the orifice of the inlet pipe 5 with a small clearance.
  • the coaxial alignment of the cone 3 and the pipe 5 ensures that the incoming water flow is distributed generally uniformly over the wet side of the cone, while the projection of the tip 24 into the orifice of the pipe 5 accelerates the incoming water flow as well as increasing its pressure which inhibits local scale deposition.
  • the bottom ends of the array of heat exchanger tubes 2 extend from the cone 3 in a horizontal plane intermediate its tip 24 and its bottom integral with the flat part of the plate 21.
  • the angle A formed by the side of the cone to the horizontal is an acute angle in excess of 50 degrees. If the cone is replaced by a pryramid, then each side of the pyramid forms such an angle with the horizontal.
  • the cone 3 along with the tubes 2 is subject to differential expansion and contraction which has the effect of shedding scale which has adhered.
  • the scale particles sink through water in the tank 20, and on striking the sloping surface of the cone 3 are directed by it to the annular area represented by the flat part of the plate 21 beneath the base of the cone 3. This area, however, is not immediately above the burner 1 but laterally offset from it. Consequently, during the continued use of the system there is no scale accumulation immediately above the burner 1 which will impair the efficiency of the system or cause overheating of the bottom of the tank 20.
  • the formation 3 is pyramidal rather than cone-shaped so that its apex, projecting into the orifice of the inlet pipe 5, forms an approximately D-shaped, restricted opening above each side of the pyramid.

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)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
EP88305611A 1987-06-19 1988-06-20 Dispositif pour chauffer indirectement un liquide Expired EP0295967B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878714419A GB8714419D0 (en) 1987-06-19 1987-06-19 Indirect liquid heating system
GB8714419 1987-06-19

Publications (3)

Publication Number Publication Date
EP0295967A2 true EP0295967A2 (fr) 1988-12-21
EP0295967A3 EP0295967A3 (en) 1990-05-30
EP0295967B1 EP0295967B1 (fr) 1991-10-30

Family

ID=10619225

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88305611A Expired EP0295967B1 (fr) 1987-06-19 1988-06-20 Dispositif pour chauffer indirectement un liquide

Country Status (3)

Country Link
EP (1) EP0295967B1 (fr)
DE (1) DE3865894D1 (fr)
GB (2) GB8714419D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130152876A1 (en) * 2007-03-05 2013-06-20 Rinnai America Corporation Water heating system
CN117704646A (zh) * 2024-01-02 2024-03-15 山东旭扬新能源有限公司 一种空气能热水器水箱除垢装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH16167A (de) * 1898-02-12 1898-10-15 Armaturen & Maschinenfabrik Ac Ofen für schnelle Erhitzung von Wasser
FR1142539A (fr) * 1956-02-06 1957-09-19 Fonderie Soc Gen De Chauffe-eau perfectionné
US4257355A (en) * 1979-08-17 1981-03-24 A. O. Smith Corporation Cold water inlet tube

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB312429A (en) * 1928-03-20 1929-05-30 Bastian Morley Co Improvements in and relating to liquid heaters
US3492972A (en) * 1967-09-12 1970-02-03 Smith Corp A O Hot water heater
AU517176B3 (en) * 1980-06-27 1981-09-24 Vulcan Australia Ltd. Liquid heating device
US4505231A (en) * 1984-03-15 1985-03-19 Apcom, Inc. Water heater construction with sediment removal means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH16167A (de) * 1898-02-12 1898-10-15 Armaturen & Maschinenfabrik Ac Ofen für schnelle Erhitzung von Wasser
FR1142539A (fr) * 1956-02-06 1957-09-19 Fonderie Soc Gen De Chauffe-eau perfectionné
US4257355A (en) * 1979-08-17 1981-03-24 A. O. Smith Corporation Cold water inlet tube

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130152876A1 (en) * 2007-03-05 2013-06-20 Rinnai America Corporation Water heating system
US9335066B2 (en) * 2007-03-05 2016-05-10 Rinnai America Corporation Water heating system
CN117704646A (zh) * 2024-01-02 2024-03-15 山东旭扬新能源有限公司 一种空气能热水器水箱除垢装置
CN117704646B (zh) * 2024-01-02 2024-05-31 山东旭扬新能源有限公司 一种空气能热水器水箱除垢装置

Also Published As

Publication number Publication date
EP0295967A3 (en) 1990-05-30
GB8714419D0 (en) 1987-07-22
GB2207740A (en) 1989-02-08
GB2207740B (en) 1991-03-06
GB8814646D0 (en) 1988-07-27
DE3865894D1 (de) 1991-12-05
EP0295967B1 (fr) 1991-10-30

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