EP2884201A1 - Hocheffizienter Wärmetauscher für Kessel und Warmluftgeneratoren - Google Patents

Hocheffizienter Wärmetauscher für Kessel und Warmluftgeneratoren Download PDF

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Publication number
EP2884201A1
EP2884201A1 EP14197365.1A EP14197365A EP2884201A1 EP 2884201 A1 EP2884201 A1 EP 2884201A1 EP 14197365 A EP14197365 A EP 14197365A EP 2884201 A1 EP2884201 A1 EP 2884201A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
combustion chamber
tubes
exchanger tubes
tube
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Withdrawn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
EP14197365.1A
Other languages
English (en)
French (fr)
Inventor
Lorenzo Vergani
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.)
Apen Group SpA
Original Assignee
Apen Group 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 Apen Group SpA filed Critical Apen Group SpA
Publication of EP2884201A1 publication Critical patent/EP2884201A1/de
Withdrawn legal-status Critical Current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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
    • F24H3/065—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators 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
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
    • F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
    • F24H3/087—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes using fluid fuel
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
    • 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
    • F28D21/0008—Air 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
    • F28D7/16—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 arranged in parallel spaced relation
    • F28D7/1615—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 arranged in parallel spaced relation the conduits being inside a casing and extending at an angle to the longitudinal axis of the casing; the conduits crossing the conduit for the other heat exchange medium
    • 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
    • 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F2001/027—Tubular elements of cross-section which is non-circular with dimples

Definitions

  • the present invention relates to a high-efficiency heat exchanger for boilers and hot air generators.
  • Heat exchangers comprising a combustion chamber, suitable to receive a burner, an exhaust fume chamber and a plurality of heat exchanger tubes communicating with the two chambers are known. Such heat exchangers are designed to be coupled with hot air generators to exploit the combustion products, such as fumes and aqueous vapor, to exchange thermal energy with the surrounding environment.
  • a heat exchanger comprising a plurality of tubes connected to one another and a combustion chamber by means of two tube plates, one front and one rear, is known from patent EP-1429085 ; the front plate is then provided with a manifold suitable to be connected to a chimney flue for expelling the combustion products.
  • the heat exchanger described in patent EP-1429085 is characterized in that it comprises heat exchanger tubes having circular section ends, said ends being at the connection points to the respective tube plates, and an intermediate portion in which the section becomes elliptical.
  • the heat exchanger tubes are grouped on two opposite sides of the combustion chamber, which is drop-shaped, and in particular are arranged at the tapered part of said combustion chamber.
  • a heat exchanger comprising a plurality of heat exchanger tubes with a serpentine configuration, which have a flat, narrow central section, while the end portions have a circular section, is known from patent US-5271376 .
  • the greater dimension is related to the size of the combustion chamber, which cannot be reduced any further without reducing energy efficiency or, in the worst cases, causing malfunctions due to the excessive overheating of the heat exchanger.
  • the circular geometry of the tube sections at their ends limits the compacting thereof because appropriate spaces are required to weld the surfaces to the plates and, at the same time, to allow the passage of fumes generated by combustion.
  • said object is reached by means of a heat exchanger comprising a combustion chamber, suitable to receive a burner, and a plurality of heat exchanger tubes connected to said combustion chamber and to one another by means of two tube plates at least one of which is provided with a manifold for releasing the combustion products, said heat exchanger being characterized in that each tube of said plurality of heat exchanger tubes has a flattened profile over its entire length and in that said combustion chamber has a cylindrically shaped body.
  • FIG 1 shows a heat exchanger 1 according to the present invention.
  • Said heat exchanger 1 substantially comprises a combustion chamber 3, suitable to receive a burner 111 ( figure 9 ), and a plurality of heat exchanger tubes 4 connected to one another and to said combustion chamber 3 by means of two tube plates, one rear tube plate 5 and one front tube plate 6.
  • the burner 111 is a gas burner of the pre-mixed, low polluting emissions type.
  • both the combustion chamber 3 and the heat exchanger tubes 4 are connected to the rear tube plate 5, while only the heat exchanger tubes 4 are connected to the front tube plate 6 ( figures 1 , 3 , 8 ).
  • Said front tube plate 6 is also provided with a manifold 7 ( figures 1 , 4 ) for connecting to a chimney flue (not shown in the figures) suitable to release the combustion exhaust products.
  • Each of the tubes 4 of said plurality of tubes 4 has a flattened profile over its entire length ( figure 2a, 2b ), so that each tube comprises two substantially flat surfaces, an upper surface 12 and a lower surface 13, with a dimension prevalently along a single dimension, i.e. the horizontal dimension, while guaranteeing the same heat exchanging surface as a tube with circular/elliptical section comprised in the known heat exchangers.
  • the dimensions of a heat exchanger having tubes 4 with flattened profile are considerably reduced ( figure 3 ).
  • Said heat exchanger tubes 4 also comprise a plurality of deformations 2 suitable to cause tortuous fume paths along the heat exchanger tube 4.
  • the deformations 2 are made on the upper surface 12 and on the lower surface 13 of the tube 4 and may have appropriate geometries; for example, said deformations 2 may be shaped as oblique segments with respect to the length of the heat exchanger tube 4, said segments being mutually staggered ( figure 2a ).
  • the heat exchanger tubes 4 ( figure 7 ) are arranged in rows 8, each comprising at least two tubes 4, said rows 8 being stacked so that the tubes 4 between two adjacent rows 8 are horizontally staggered. Furthermore, as shown in figure 7 , the tubes 4 are advantageously arranged over a single side of the combustion chamber 3.
  • Said combustion chamber 3 has a substantially cylindrical shaped body comprising a first base 9 connected to said rear tube plate 5 and a second base 10 provided with appropriate housing 11 suitable to insert the burner 111 ( figure 9 ).
  • the circular section of the combustion chamber 3 offers heat distribution uniformity by optimizing the production process and increasing the energy efficiency of the heat exchanger 1.
  • the heat exchanger 1 is made of stainless steel.
  • the fumes generated by the combustion caused by the burner 111 cross the rear tube plate 5 and, through the heat exchanger tubes 4, reach inside the front tube plate 6 (see the arrows in figure 8 ); in said front tube plate 6, the fumes reach condensation temperatures and are ejected by means of the chimney flue (not shown in the figure).
  • part of the heat is surrendered by the combustion chamber 3 and part is surrendered by the heat exchanger tubes 4, thus exchanging thermal energy with the surrounding environment.
  • the flattened profile of the tubes 4 over their entire length allows a higher thermal efficiency because the fume speed is increased by virtue of such a conformation thus increasing the realized thermal exchange.
  • the heat exchanger 1 described above may be used for heating environments, e.g. in combination with a fan for generating a hot air flow (hot air generators) or similarly can be inserted as a module in a more complex machine, such as an air treatment unit (U.T.A.).
  • a fan for generating a hot air flow hot air generators
  • U.T.A. air treatment unit

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)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Central Air Conditioning (AREA)
  • Air Supply (AREA)
EP14197365.1A 2013-12-13 2014-12-11 Hocheffizienter Wärmetauscher für Kessel und Warmluftgeneratoren Withdrawn EP2884201A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT002086A ITMI20132086A1 (it) 2013-12-13 2013-12-13 Scambiatore di calore ad elevata efficienza per caldaie e generatori d'aria calda

Publications (1)

Publication Number Publication Date
EP2884201A1 true EP2884201A1 (de) 2015-06-17

Family

ID=49958578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14197365.1A Withdrawn EP2884201A1 (de) 2013-12-13 2014-12-11 Hocheffizienter Wärmetauscher für Kessel und Warmluftgeneratoren

Country Status (3)

Country Link
EP (1) EP2884201A1 (de)
IT (1) ITMI20132086A1 (de)
RU (1) RU2014149802A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU183751U1 (ru) * 2017-12-26 2018-10-02 Общество с ограниченной ответственностью "ИнвестГрупп" Теплообменное устройство
WO2022184814A1 (de) * 2021-03-05 2022-09-09 Kiszilak Juergen Portable heizungsvorrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2605091A1 (fr) * 1986-10-14 1988-04-15 Tecnoclima Spa Generateur d'air chaud a tres fort rendement
US5094224A (en) * 1991-02-26 1992-03-10 Inter-City Products Corporation (Usa) Enhanced tubular heat exchanger
US5271376A (en) 1991-08-12 1993-12-21 Rheem Manufacturing Company Serpentined tubular heat exchanger apparatus for a fuel-fired forced air heating furnace
EP1429085A1 (de) 2002-12-10 2004-06-16 Apen Group S.p.A. Effizienter Wärmetauscher und Brennkammer-Anordnung für Kessel und Lufterhitzer
US20050092316A1 (en) * 2003-11-04 2005-05-05 Schonberger Marty L.Sr. Hot air furnace
WO2009095944A2 (en) * 2008-01-30 2009-08-06 Tecnoclima S.P.A. Improved hot air unit heater

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2605091A1 (fr) * 1986-10-14 1988-04-15 Tecnoclima Spa Generateur d'air chaud a tres fort rendement
US5094224A (en) * 1991-02-26 1992-03-10 Inter-City Products Corporation (Usa) Enhanced tubular heat exchanger
US5271376A (en) 1991-08-12 1993-12-21 Rheem Manufacturing Company Serpentined tubular heat exchanger apparatus for a fuel-fired forced air heating furnace
EP1429085A1 (de) 2002-12-10 2004-06-16 Apen Group S.p.A. Effizienter Wärmetauscher und Brennkammer-Anordnung für Kessel und Lufterhitzer
US20050092316A1 (en) * 2003-11-04 2005-05-05 Schonberger Marty L.Sr. Hot air furnace
WO2009095944A2 (en) * 2008-01-30 2009-08-06 Tecnoclima S.P.A. Improved hot air unit heater

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU183751U1 (ru) * 2017-12-26 2018-10-02 Общество с ограниченной ответственностью "ИнвестГрупп" Теплообменное устройство
WO2022184814A1 (de) * 2021-03-05 2022-09-09 Kiszilak Juergen Portable heizungsvorrichtung

Also Published As

Publication number Publication date
ITMI20132086A1 (it) 2015-06-14
RU2014149802A (ru) 2016-07-10

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