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EP2499437B1 - Echangeur de chaleur avec performance amelioree - Google Patents

Echangeur de chaleur avec performance amelioree Download PDF

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Publication number
EP2499437B1
EP2499437B1 EP10768981.2A EP10768981A EP2499437B1 EP 2499437 B1 EP2499437 B1 EP 2499437B1 EP 10768981 A EP10768981 A EP 10768981A EP 2499437 B1 EP2499437 B1 EP 2499437B1
Authority
EP
European Patent Office
Prior art keywords
coiled duct
heat exchanger
section
transverse cross
coiled
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.)
Active
Application number
EP10768981.2A
Other languages
German (de)
English (en)
Other versions
EP2499437A1 (fr
Inventor
Mario Morini
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.)
Unical AG SpA
Original Assignee
Unical AG 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 Unical AG SpA filed Critical Unical AG SpA
Publication of EP2499437A1 publication Critical patent/EP2499437A1/fr
Application granted granted Critical
Publication of EP2499437B1 publication Critical patent/EP2499437B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F28D7/02—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 helically coiled
    • F28D7/024—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 helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
    • 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
    • F28D7/10—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 one within the other, e.g. concentrically
    • F28D7/14—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 one within the other, e.g. concentrically both tubes being bent
    • 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
    • F28F1/14—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 longitudinally
    • F28F1/16—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 longitudinally the means being integral with the element, e.g. formed by extrusion
    • 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
    • F28F1/34—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 obliquely
    • F28F1/36—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 obliquely the means being helically wound fins or wire spirals
    • 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
    • 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
    • F28F1/422—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 with outside means integral with the tubular element and inside means integral with the tubular element

Definitions

  • the present invention relates to a heat exchanger with improved thermal efficiency.
  • heat exchangers In the field of heat exchangers and the like, for boilers to be used for heating sanitary water or water for central heating systems, the use is known of heat exchangers that are constituted, generally, by a metal container body inside which a combustion chamber is provided, which accommodates one or more coiled ducts inside which the fluids to be heated circulate.
  • the combustible mixture which is typically constituted by air and gas, is sent forcibly into the burner under the thrust of a fan and, after the combustion that occurs in an appropriate chamber, as a result of the thrust from the fan, the burned gases strike the duct by way of the spaces provided in the coiled duct, thus achieving the desired exchange of heat.
  • EP 1 750 070 A1 discloses a condensation gas-burning boiler with a heat exchanger through which combustion fumes and water flow, for producing hot water.
  • a finned tube through which water flows is arranged inside a cylindrical casing, whereby the finned tube coils about the longitudinal axis of the casing to form a helix comprising a succession of adjacent turns each located adjacent the cylindrical lateral wall of the casing.
  • a central deflecting disk is arranged to direct the fumes radially perpendicular to the longitudinal axis between successive turns of the helix, and the tube is provided with an oval-section wall with parallel fins extending tangentially and radially thereto, such that the fumes flow first from the boiler radially outward between gaps of the tangential and parallel fins of the helix turns towards the casing lateral wall, then secondly in a direction parallel to the longitudinal axis at the lateral wall, then thirdly radially inwardly from the lateral wall again between gaps of the tangential and parallel fins of the helix turns, whereby the successive gaps between the tangential and parallel fins of the helix turns define compulsory fume paths.
  • EP 0 385 700 discloses a boiler installation comprising an outer casing, central catalytic burner tube, and extending around the burner tube, a heat-exchange unit comprising twin coils each in the form of an inner pipe provided with interior and exterior helical formations and an exterior pipe surrounding the inner pipe. Mains cold water is fed through the inner pipe and gets heat exchanged to it by heated water fed through the exterior pipe which is heated by the hot gases produced by the burner tube.
  • the exterior pipe is provided with helical ribs for increasing the surface area exposed externally thereof.
  • the aim of the present invention is to provide a heat exchanger with improved thermal efficiency that solves the drawbacks of the known art by increasing the thermal efficiency of the heat exchanger when compared to a conventional heat exchanger of the same dimensions.
  • an object of the present invention consists of providing a heat exchanger that is structurally simple, easy to make and assemble, and at low cost.
  • the heat exchanger with improved thermal efficiency comprises a container body 2, cylindrical with a circular end face, inside which a coiled duct 3 is accommodated which externally delimits a chamber 4 for the combustion of a combustible mixture 5 for heating the fluid or fluids to be heated 6, which circulate in the coiled duct 3, with the burned gases 7 produced by the combustion of the combustible mixture 5 by means of a burner cylinder 16 with a perforated surface 17.
  • the burned gases 7, produced by the combustion of the combustible mixture 5 and defining a flow of hot fluid are sent forcibly onto the coiled duct 3 thus striking its outer surface in order to heat the fluid to be heated 6.
  • the coiled duct 3 runs from an inlet mouth 8 to an outlet mouth 9, both outside the container body 2 and positioned, respectively, in the lower portion and in the upper portion of the container body 2.
  • a plurality of fins 30 is provided which are defined on the outer surface of the coiled duct 3 and which run substantially along the entire longitudinal length of the coiled duct 3 in order to guide the hot fluid 7 along the coiled duct 3 with consequent increasing of the heat exchange between the hot fluid 7 and the fluid to be heated 6.
  • the coiled duct 3 is substantially circular in transverse cross-section and the fins 30 run radially with respect to the circular transverse cross-section of the coiled duct 3, the whole being made in a single piece and without welds.
  • the coiled duct 3 is divided internally, along a transverse cross-section, into a plurality of channels which are substantially parallel and independent of each other, each channel being crossed by a respective fluid to be heated 6.
  • the coiled duct 3 is divided internally, along a transverse cross-section, into a main channel 31, which is coaxial to the coiled duct 3, and into a plurality of parallel secondary channels 32, which are mutually independent and radially external to the main channel 31.
  • the fins 30 can trace a helical path with respect to the axis of the coiled duct 3.
  • the coiled duct 3 can be divided into four channels 33 each of which is defined by a circular sector of the circular transverse cross-section of the coiled duct 3, for example, equal to one quarter of the circular transverse cross-section of the coiled duct 3.
  • the coiled duct 3 can be arranged in proximity to, or even almost in direct contact with, substantially along all of its length, the outer walls 10 of the container body 2 and an element 11 for conveying the burned gases 7 in order to direct them to a discharge collection tank 20 and subsequently to a discharge tube 12 outside the container body 2.
  • an air intake 14 is provided for forcibly injecting the combustible mixture 5, which can be for example a mixture of air and gas, by way of the above mentioned external fan means which consist, for example, in a fan outside the container body 2 which is not shown.
  • the combustible mixture 5 is then sent into an intake chamber 15 which is annular in shape, is also defined at the upper face 13, and is connected with the burner cylinder 16.
  • the intake chamber 15 is connected directly with the burner cylinder 16 which is defined by a permeable surface 17 and is cylindrical with a circular end face where the flame burns.
  • the burner cylinder 16 besides being connected at one end with the intake chamber 15 in order to introduce the combustible mixture 5 into the combustion chamber 4, has the opposite end closed by a thermally insulating disk 18.
  • the conveyance element 11 can comprise a cylindrical hollow body with a circular end face, which is delimited in an upper region by the thermally insulating disk 18 and is connected, in proximity to the thermally insulating disk 18, with the discharge tube 12.
  • the conveyance element 11 is accommodated in the container body 2 on the opposite side with respect to the burner cylinder 16 and has a lower opening which faces the lower end face 19 of the container body 2 for the transit of the burned gases 7 from the combustion chamber 4 to the discharge collection tank 20.
  • the discharge collection tank 20 is arranged at the lower end face 19 of the container body 2 and is adapted to collect the liquids 21 produced by the condensation of the burned gases 7 in contact with the coiled duct 3.
  • the discharge collection tank 20 is provided with an outward discharge connector 22 for the outflow of the liquids 21 from the container body 2 and with a discharge connector 23 for the outflow of the exhaust gases 7 by way of the outward discharge tube 12.
  • the overall geometry of the heat exchanger 1 or some components can change, such as, for example, the discharge tube 12 which can be accommodated inside the container body 2.
  • the coiled duct 3 remains unchanged.
  • the combustible mixture 5, under the thrust of the fan means, is sent into the intake chamber 15 through the air intake 14 to then descend in the direction of the axis, i.e. parallel to the axis 25 of the heat exchanger 1, in the burner cylinder 16.
  • the combustion occurs through the permeable surface 17 of the burner cylinder 16 and the burned gases 7 are directed into the combustion chamber 4.
  • the burned gases 7 Due to the thrust generated by the fan means, the burned gases 7 are pushed towards the coiled duct 3 and guided into the helicoid grooves defined between one fin 30 and the next, thus completely striking the outer surface of the coiled duct 3 and yielding heat to it.
  • the burned gases 7, again due to the thrust generated by the fan means, are pushed further downwards because they are compelled by their being guided into the helicoid grooves defined between one fin 30 and the next, and are then conveyed by the conveyance element 11 towards the lower end face 19 of the container body 2.
  • any condensation 21 is collected on the bottom of the container body 2 in the discharge collection tank 20 and is then discharged by way of the connector 22, and the burned gases 7 flow outside by way of the discharge connector 23 and the discharge tube 12.
  • this yield occurs thanks to the inner walls 34 or 35 of the coiled duct 3 which divide the channels 31, 32 and 33.
  • the material from which the coiled duct 3 is made, for example aluminum or alloys thereof, through the inner walls 34 and 35 bring the heat yielded to the fins 30 right to the centre of the coiled duct 3.
  • the heat exchanger with improved thermal efficiency fully achieves the intended aim and object in that the presence of the fins, specifically with helicoid twisting, on the outer surface of the coiled duct allows to guide the hot fluid, thus making it completely strike the outer surface of the coiled duct so as to optimise the heat exchange.
  • a further advantage of the heat exchanger with improved thermal efficiency, according to the present invention consists in that it is structurally simple, easy to make and at low cost.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (8)

  1. Echangeur de chaleur (1) avec performance thermique améliorée, comprenant un corps de confinement (2) traversé par un écoulement forcé de fluide chaud (7) et au moins un conduit hélicoïdal (3) intérieurement traversé par au moins un fluide à chauffer (6), ledit au moins un conduit hélicoïdal (3) étant logé à l'intérieur dudit corps de confinement (2) et étant frappé par ledit fluide chaud (7) afin de chauffer ledit au moins un fluide à chauffer (6), l'échangeur de chaleur (1) comprenant en outre une pluralité d'ailettes (30) qui sont prévues sur la surface externe dudit au moins un conduit hélicoïdal (3) et s'étendent sensiblement le long de toute la longueur longitudinale dudit au moins un conduit hélicoïdal (3) afin de guider ledit fluide chaud (7) le long dudit au moins un conduit hélicoïdal (3) afin d'augmenter l'échange de chaleur entre ledit au moins un fluide chaud (7) et ledit fluide à chauffer (6), lesdites ailettes (30) traçant une trajectoire hélicoïdale par rapport à l'axe dudit au moins un conduit hélicoïdal (3), caractérisé en ce que ledit au moins un conduit hélicoïdal (3) est agencé à proximité de, ou bien presque en contact direct avec, sensiblement le long de toute sa longueur, les parois externes (10) dudit corps de contenant (2) et un élément (11) pour transporter les gaz brûlés (7) afin de les diriger vers un réservoir de collecte de décharge (20) et ensuite un tube de décharge (12) à l'extérieur du corps de contenant (2), dans lequel la géométrie dudit au moins un conduit hélicoïdal (3), en étant contenu entre les parois du corps de contenant (2) et de l'élément de transport (11), force les gaz brûlés (7) à traverser les rainures hélicoïdales définies entre les ailettes (30) pour augmenter la performance thermique.
  2. Echangeur de chaleur (1) selon la revendication 1, caractérisé en ce que ledit au moins un conduit hélicoïdal (3) a sensiblement une section transversale circulaire et en ce que lesdites ailettes (30) s'étendent radialement par rapport à ladite section transversale circulaire.
  3. Echangeur de chaleur (1) selon une ou plusieurs des revendications précédentes, caractérisé en ce que ledit au moins un conduit hélicoïdal (3) est intérieurement divisé, le long d'une section transversale, en une pluralité de canaux (33) qui sont sensiblement parallèles et indépendants les uns des autres, chaque canal étant traversé par un fluide respectif à chauffer (6).
  4. Echangeur de chaleur selon la revendication 3, caractérisé en ce que chacun desdits canaux (33) est formé par un secteur circulaire de la section transversale circulaire dudit au moins un conduit hélicoïdal (3).
  5. Echangeur de chaleur (1) selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'il comprend quatre desdits canaux (33) ayant une section transversale qui est sensiblement égale à un quart de la section transversale circulaire dudit au moins un conduit hélicoïdal (3).
  6. Echangeur de chaleur (1) selon une ou plusieurs des revendications 1 et 2, caractérisé en ce que ledit au moins un conduit hélicoïdal (3) est intérieurement divisé, le long d'une section transversale, en un canal principal (31), qui est coaxial par rapport audit au moins un conduit hélicoïdal (3) et en une pluralité de canaux secondaires parallèles (32), qui sont mutuellement indépendants et radialement externes par rapport audit canal principal (31), ledit canal principal (31) et lesdits canaux secondaires (32) étant traversés respectivement par un premier fluide à chauffer (6) et par un second fluide à chauffer (6).
  7. Echangeur de chaleur (1) selon la revendication 6, caractérisé en ce que chacun desdits canaux secondaires (32) est formé par un secteur annulaire dudit au moins un conduit hélicoïdal (3).
  8. Echangeur de chaleur (1) selon une ou plusieurs des revendications 6 et 7, caractérisé en ce qu'il comprend quatre desdits canaux secondaires (32) ayant une section transversale qui est sensiblement égale à un quart de la section transversale de la région à l'extérieur dudit canal principal (31) dudit au moins un conduit hélicoïdal (3).
EP10768981.2A 2009-11-12 2010-10-27 Echangeur de chaleur avec performance amelioree Active EP2499437B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2009A001983A IT1396923B1 (it) 2009-11-12 2009-11-12 Scambiatore di calore ad efficienza termica incrementata.
PCT/EP2010/066277 WO2011057895A1 (fr) 2009-11-12 2010-10-27 Échangeur de chaleur avec rendement thermique amélioré

Publications (2)

Publication Number Publication Date
EP2499437A1 EP2499437A1 (fr) 2012-09-19
EP2499437B1 true EP2499437B1 (fr) 2018-05-02

Family

ID=42167572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10768981.2A Active EP2499437B1 (fr) 2009-11-12 2010-10-27 Echangeur de chaleur avec performance amelioree

Country Status (3)

Country Link
EP (1) EP2499437B1 (fr)
IT (1) IT1396923B1 (fr)
WO (1) WO2011057895A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015015335A1 (de) * 2015-11-26 2017-06-01 Linde Aktiengesellschaft Latentwärmespeicher, Verfahren und Heizanordnung
CN114659393B (zh) * 2022-03-23 2023-07-18 江苏庆峰工程集团有限公司 一种换热系统

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0385700A1 (fr) * 1989-02-28 1990-09-05 Michael John Nunnerley Appareil d'échange de chaleur, système d'échange de chaleur, méthode pour améliorer l'efficacité d'échange de chaleur, et circuit de réfrigération

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2209325C3 (de) * 1970-05-18 1978-08-03 Noranda Metal Industries Inc., Bellingham, Wash. (V.St.A.) Wärmeaustauschrohr
WO2000058682A1 (fr) * 1999-03-31 2000-10-05 Asea Brown Boveri Limited Echangeur thermique
ES2388782T3 (es) * 2005-08-05 2012-10-18 Elbi International S.P.A. Caldera de gas dotada de un intercambiador de calor con tubo con aletas y método de producción del mismo

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0385700A1 (fr) * 1989-02-28 1990-09-05 Michael John Nunnerley Appareil d'échange de chaleur, système d'échange de chaleur, méthode pour améliorer l'efficacité d'échange de chaleur, et circuit de réfrigération

Also Published As

Publication number Publication date
WO2011057895A1 (fr) 2011-05-19
EP2499437A1 (fr) 2012-09-19
IT1396923B1 (it) 2012-12-20
ITMI20091983A1 (it) 2011-05-13
WO2011057895A8 (fr) 2011-07-07

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