EP1914486A1 - Chaudière à gaz avec échangeur de chaleur principal pour la production d'eau chaude - Google Patents

Chaudière à gaz avec échangeur de chaleur principal pour la production d'eau chaude Download PDF

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Publication number
EP1914486A1
EP1914486A1 EP06425725A EP06425725A EP1914486A1 EP 1914486 A1 EP1914486 A1 EP 1914486A1 EP 06425725 A EP06425725 A EP 06425725A EP 06425725 A EP06425725 A EP 06425725A EP 1914486 A1 EP1914486 A1 EP 1914486A1
Authority
EP
European Patent Office
Prior art keywords
vertical axis
plate
gas boiler
heat exchanger
parallel
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Withdrawn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
EP06425725A
Other languages
German (de)
English (en)
Inventor
Christian Cannas
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.)
Riello SpA
Original Assignee
Riello SpA
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 Riello SpA filed Critical Riello SpA
Priority to EP06425725A priority Critical patent/EP1914486A1/fr
Publication of EP1914486A1 publication Critical patent/EP1914486A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • 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
    • F28F1/325—Fins with openings

Definitions

  • the present invention relates to a gas boiler with a main heat exchanger for producing hot water.
  • a gas boiler of the above-identified type extends along a vertical axis, and comprises a burner, which is arranged transversely to the vertical axis; and a combustion gas exhaust conduit arranged above the burner; the main heat exchanger extending transversely to the vertical axis and being arranged above the burner and below the combustion gas exhaust conduit so that the combustion gases flow from the burner through the main heat exchanger toward the combustion gas exhaust conduit in a direction substantially parallel to the vertical axis.
  • the main heat exchanger comprises a number of pipes and a plurality of fins; each fin comprising a plate transversal to the pipes and parallel to the vertical axis.
  • the performance of a gas boiler is determined by, among other parameters, the heat exchange rate of the main heat exchanger and the speed of the combustion gases downward of the main heat exchanger or the draft of the combustion gases along the combustion gas exhaust pipe.
  • a kind of gas main heat exchangers for gas boilers of the above-identified type is designed to improve the heat exchange rate by embossing the plate of each fin, but it excessively slows down the speed of the combustion gases as they flow through of the embossed plates.
  • the embossed plates may deviate the fumes from a direction substantially parallel to the vertical axis or create an excessive turbulence in the combustion gases.
  • Another kind of main heat exchangers for gas boilers comprises fins made of even plates so as to increase the speed of the combustion gases of the combustion gas exhaust draft. However, the combustion gases flow too fast through the main heat exchanger so that the heat exchange rate is too poor.
  • a gas boiler with a main heat exchanger for producing hot water extends along a vertical axis, and comprises a burner, which is arranged transversely to the vertical axis; and a combustion gas exhaust conduit arranged above the burner; the main heat exchanger extending transversely to the vertical axis and being arranged above the burner and below the combustion gas exhaust conduit so that the combustion gases flow from the burner through the main heat exchanger toward the combustion gas exhaust conduit in a direction substantially parallel to the vertical axis; the main heat exchanger comprising a number of pipes and a plurality of fins; each fin comprising a plate transversal to the pipes and parallel to the vertical axis; the gas boiler being characterised in that each fin is provided with at least an offset portion protruding from the plate and parallel to the vertical axis so as to define a flow passage parallel to the vertical axis between the offset portion and the corresponding plate.
  • the offset portion protruding from the plate improves the heat exchange rate without excessively slowing down the speed of the combustion gases.
  • Number 1 in Figure 1 indicates as a whole a gas boiler having an outer structure 2 that houses a combustion chamber 3; a burner 4; a main heat exchanger 5; a gas supply conduit 6; a combustion gas exhaust conduit 7 joined to the combustion chamber 3; a primary water circuit 8; a sanitary water circuit 9; and a secondary heat exchanger 10.
  • the primary water circuit 8 comprises a circulation pump 11; an expansion tank 12, a valve 13; and re-circulation branches 14 and 15, which are connected to the secondary heat exchanger 10 and to valve 13.
  • the primary water circuit 8 is connected to the main heat exchanger 5 so as to circulate the water through the main heat exchanger 5 and heat the water.
  • the boiler 1 extends substantially along a vertical axis A1 ; and the burner 4 is arranged along the vertical axis, and oriented perpendicularly to the vertical axis A1.
  • the main heat exchanger 5 is arranged along the vertical axis A1 above the burner 4 and below the combustion gas exhaust conduit 7, and is oriented perpendicularly to the vertical axis A1.
  • the burner 4 and the main heat exchanger 5 are arranged inside the combustion chamber 3 that converges toward and is joined to the combustion gas exhaust conduit 7. When the burner 4 is on, the combustion gases flow from the burner 4 through the main heat exchanger 5 and, then, are conveyed through the exhaust conduit 7.
  • the main heat exchanger 5 has substantially the shape of a rectangular prism of a longitudinal axis A2 perpendicular to vertical axis A1.
  • the main heat exchanger 5 comprises two elongated opposite headers 16, which are parallel to a transversal axis A3 perpendicular to the vertical axis A1 and to the longitudinal axis A2; six pipes 17 that are parallel to longitudinal axis A2 and connect the opposite headers 16; and a plurality of fins 18, which extends transversely to longitudinal axis A2 and are connected to the pipes 17.
  • Each header 16 comprises a first chamber 19 and a second chamber 20.
  • the first chamber 19 is provided with a connection port 21 for the primary water circuit 7 and two connection ports 22 for the pipes 17.
  • the second chamber 20 is provided with four connections port 22 for the pipes 17.
  • the water circulates into to main heat exchanger 5 and flows through a connection port 21 in the first chamber 19 of header 16 and, then, through a couple of pipes 17 reaches the second chamber 20 of the opposite header 16. Then, the water flows from the opposite header 16 into the second chamber 20 of the header 16 and, then, into the first chamber 19 of the opposite header 16. The water is expelled from the main heat exchanger 5 through the connection 21 of the first chamber 19 of the opposite header 16.
  • Each second chamber 20 has the function of collecting the water from a couple of pipes 17 in a given direction and feeding the water to a couple of adjacent pipes 17 in the opposite direction.
  • Pipes 17 extend along longitudinal axis A2 and are equally spaced from each other in a direction parallel to the transversal axis A3.
  • each pipe 17 has a wall 23 and an oblong cross section with a first axis X far longer than a second axis Y that is perpendicular to the first axis X.
  • the first axis X is parallel to the vertical axis A1
  • second axis Y is parallel to transversal axis A3.
  • each fin 18 comprises a plate 24 having two opposite parallel faces 25 and 26 and is provided with a row of six evenly spaced holes 27, each suitable to host a pipe 17.
  • Each hole 27 is wholly contoured by a rim 28, which is perpendicular to the plate 24, extends from face 25, and adheres to the wall 23 of the pipe 17 nearly for the entire perimeter of the pipe 17 except for a small section of the perimeter.
  • each hole 27 comprises a portion 29 matching with the cross section of the pipe 17 and a portion 30, which remain free even after the insertion of the pipe 17 into hole 27.
  • Each large side 31 and two small sides 32 delimit plate 24.
  • Each large side 31 has a regularly waved contour
  • each small side 32 has a straight contour and is provided with a rib 33 that is perpendicular to plate 24 and parallel to the vertical axis A1.
  • the rib 33 extends from face 25 of a height H greater than the height of rim 28 and spaces the fin 18 from an adjacent fin 18 of a given distance equal to height H. In other words, the free end of each rib 33 is in contact with the plate 24 along face 26 of the adjacent fin 18.
  • Each fin 18 is provided with three offset portion 34, each of which is located along a plate 24 between two adjacent pipes 17, and extends from face 25.
  • the offset portion 34 is made of a deformed portion of the plate 24.
  • the offset portion 34 is attached to the plate 24 along two edges 35, and is separated from plate 24 along two edges 36 perpendicular to edges 35.
  • Edges 35 are parallel to vertical axis A1, whereas edges 36 are parallel to transversal axis A3.
  • the offset portion 34 comprises a central panel 37, which is parallel to the corresponding plate 24; and two lateral panels 38 that join the central panel 37 to the plate 24 and are parallel to the vertical axis A1.
  • the central panel 37 is offset of substantially half the distance (height H) separating two adjacent fins from plate 24 so as to be equidistant from the corresponding plate 24 and the adjacent plate 24.
  • a flow passage parallel to vertical axis A1 is defined between the offset portion 34 and the plate 24, from which the offset portion 34 protrudes.
  • each offset portion 34 is equidistant from the adjacent pipes 17 and equidistant from the opposite large sides 31 of the plate 24.
  • Each fin 18 comprises three offset portions 34 that are concentrated in the centre of the plate 24.
  • the pipes 17 are numbered from a small side 32 to the opposite small side 32 as the first, second, third, fourth, fifth and sixth pipe 17.
  • the offset portions 34 are located only between the second and the third pipes 17; the third and the fourth pipes 17; and the fourth and the fifth pipes 17.
  • the number of pipes 17 and offset portion 34 may change in accordance with the power, size and shape of the main heat exchanger 5 without departing from the scope of present invention.
  • a gas boiler embodying the features of the present invention has proven to provide high performances in particular in relation to the heat exchange rate and the draft. Tests carried out by the applicant have proven that such a gas boiler can be classified as a three stars boilers according to the European Standard defined in the in directive 92/42 EC.

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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)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP06425725A 2006-10-20 2006-10-20 Chaudière à gaz avec échangeur de chaleur principal pour la production d'eau chaude Withdrawn EP1914486A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06425725A EP1914486A1 (fr) 2006-10-20 2006-10-20 Chaudière à gaz avec échangeur de chaleur principal pour la production d'eau chaude

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425725A EP1914486A1 (fr) 2006-10-20 2006-10-20 Chaudière à gaz avec échangeur de chaleur principal pour la production d'eau chaude

Publications (1)

Publication Number Publication Date
EP1914486A1 true EP1914486A1 (fr) 2008-04-23

Family

ID=37898501

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06425725A Withdrawn EP1914486A1 (fr) 2006-10-20 2006-10-20 Chaudière à gaz avec échangeur de chaleur principal pour la production d'eau chaude

Country Status (1)

Country Link
EP (1) EP1914486A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2628954C1 (ru) * 2016-04-04 2017-08-23 Денис Николаевич Хазиев Водогрейный котел

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL98349C (fr) * 1900-01-01
EP0315577A2 (fr) * 1987-11-03 1989-05-10 Joh. Vaillant GmbH u. Co. Appareil à brûleur en particulier réchauffeur d'eau

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL98349C (fr) * 1900-01-01
EP0315577A2 (fr) * 1987-11-03 1989-05-10 Joh. Vaillant GmbH u. Co. Appareil à brûleur en particulier réchauffeur d'eau

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2628954C1 (ru) * 2016-04-04 2017-08-23 Денис Николаевич Хазиев Водогрейный котел

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