EP2438363B1 - Élément creux allongé pour échangeur de chaleur à condensation d'une chaudière à gaz à condensation pour produire de l'eau chaude - Google Patents

Élément creux allongé pour échangeur de chaleur à condensation d'une chaudière à gaz à condensation pour produire de l'eau chaude Download PDF

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Publication number
EP2438363B1
EP2438363B1 EP09787747.6A EP09787747A EP2438363B1 EP 2438363 B1 EP2438363 B1 EP 2438363B1 EP 09787747 A EP09787747 A EP 09787747A EP 2438363 B1 EP2438363 B1 EP 2438363B1
Authority
EP
European Patent Office
Prior art keywords
hollow member
elongated hollow
fins
axis
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.)
Not-in-force
Application number
EP09787747.6A
Other languages
German (de)
English (en)
Other versions
EP2438363A2 (fr
Inventor
Stefano Casiraghi
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.)
Elbi International SpA
Original Assignee
Elbi International SpA
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Filing date
Publication date
Application filed by Elbi International SpA filed Critical Elbi International SpA
Priority to PL09787747T priority Critical patent/PL2438363T3/pl
Publication of EP2438363A2 publication Critical patent/EP2438363A2/fr
Application granted granted Critical
Publication of EP2438363B1 publication Critical patent/EP2438363B1/fr
Not-in-force 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
    • 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
    • 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
    • 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
    • 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
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/08—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow channels

Definitions

  • the present invention relates in general to an elongated hollow member for a condensation heat exchanger for a condensation gas boiler for producing hot water, wherein the water flows in the elongated hollow member and combustion fumes flow about the elongated hollow member, and in particular to an elongated hollow member of the kind defined in the preamble of claim 1.
  • a gas boiler for producing hot water normally comprises a gas burner, and at least one heat exchanger through which combustion fumes and water flow.
  • Some types of gas boilers known as gas condensation boilers, condense the steam in the combustion fumes and transfer the latent heat from the combustion fumes to the water.
  • Condensation boilers are further divided into a first type, equipped with a heat exchanger close to the gas burner, and a condensation heat exchanger for simply condensing the steam of the combustion fumes; and a second type, equipped with only a condensation heat exchanger, which provides solely for thermal exchange along a first portion, and for both thermal exchange and condensation of the steam of the combustion fumes along a second portion.
  • a particular type of condensation heat exchangers normally comprises a casing extending along a first axis and through which combustion fumes flow; and an elongated hollow member, which consists of a tube coiled at least in part in a helix about the first axis to form a succession of spaced apart turns, and extends along a second axis.
  • the combustion fumes flow through a gap formed between the spaced apart turns in close proximity of the tube to transfer heat to the water flowing along the tube.
  • the elongated hollow member comprises a tube and fins perpendicular to the second axis.
  • the elongated hollow member comprises a tube, and fins, which are parallel to the second axis and are integrally made with the tube.
  • the fins are co-extruded with the tube, are easy to produce, and contribute to improve the thermal exchange between the water and the combustion fumes.
  • the above-identified elongated hollow member including co-extruded-fins proved to be extremely effective in term of heat exchange rate.
  • the market of condensation boiler demands for an even higher thermal exchange rate.
  • the current condensation boilers are of remarkable size, and it is extremely important for the condensation boiler manufacturers to reduce the size of the condensation boilers, while keeping a high thermal efficiency for the condensation heat exchanger. Any improvement in the thermal exchange rate may allow reducing the size of the gas condensation boilers and reaching outstanding heat exchange efficiency for the condensation heat exchanger.
  • an object of the present invention consists in making an elongated hollow member further improving the thermal efficiency of the above-identified condensation heat exchangers.
  • a further object of the present invention consists in making an elongated hollow member that is easy to produce so as to simplify the manufacturing of the heat exchanger.
  • the first fins are locally deformed so as to keep said turns mutually spaced apart in accordance with a given configuration.
  • the elongated hollow member comprises two second fins, which are parallel to said second axis, are integrally made with said tube, face each other, extends from said tube towards the first axis, and are locally deformed so as to keep said turns mutually spaced apart in accordance with a given configuration.
  • the turns are kept in a space apart configurations by the local deformations of the first and/or second fins without the need of additional element such as spacer arranged between the turns. Furthermore, the local deformations of the fins are easy to be made. In this way, the size of the gap is thoroughly controlled by the positions of the first and/or second fins.
  • reference numeral 1 indicates as a whole a condensation heat exchanger for a condensation gas boiler not shown in the enclosed Figures.
  • the condensation heat exchanger 1 comprises a first portion having the function of ordinary heat exchanger a and second portion suitable to condense the steam in the combustion fumes flowing though the condensation heat exchanger 1, and comprises an outer casing 2 for containing the combustion fumes; and an elongated hollow member 3 housed in the casing 2 and for channelling the water.
  • the condensation heat exchanger 1 defines a combustion chamber and houses a cylindrical burner 4, and deflecting members for guiding the combustion fumes along a given paths inside casing 2.
  • the deflecting members include a front annular plate 5, an intermediate plate 6, and a back annular plate 7.
  • the condensation heat exchanger 1 is substantially cylindrical in shape, and extends along a substantially horizontal axis A1.
  • Casing 2 comprises a cylindrical wall 8 of axis A1; an annular front wall 9 connected to cylindrical wall 8; and a back annular wall 10 connected to cylindrical wall 8, and a fumes exhaust conduit 11.
  • Front annular wall 9 and front annular plate 5 may be made as a single piece. The same applies to back annular wall 10 and back annular plate 7.
  • Burner 4 extends, coaxially with exchanger 1, inside of casing 2 for a given length from the annular front wall 9 along axis A1.
  • the elongated hollow member 3 is partly coiled in a helix extending about axis A1 and forms a succession of spaced apart turns 12, each located close to cylindrical wall 8, and two opposite straight ends 13 and 14 ( Figures 2, 3 and 4 ) with known fittings (not shown) for connecting the elongated hollow member 3 to a water circuit, not shown.
  • straight end 13 is a front end parallel to axis A1
  • straight end 14 is a back end extending radially from helix with respect to axis A1.
  • the combustion fumes deflecting members, the elongated hollow member 3 and the casing 2 define paths for the combustion fumes for forcing the combustion fumes to flow trough a helical gap 22 ( figure 5 ) formed by the spaced apart turns 11, and an annular channel formed between the elongated hollow member 3 and the casing 2, in particular between the elongated hollow member 3 and the cylindrical wall 8 of the casing 2.
  • the intermediate plate 6 has a thin lateral edge 15 engaging turns 12 so that the intermediate plate 6 may be screwed to turns 12 into the desired position along axis A1.
  • the intermediate plate is omitted and the fume evacuation conduit is connected to the cylindrical wall of the casing.
  • the elongated hollow member 3 is preferably made of aluminium or aluminium-based alloy and is fabricated by extrusion and then coiled in a helix. Once coiled, the elongated hollow member 3 extends along a helically shaped axis A2.
  • the elongated hollow member 3 comprises a tube 16; two fins 17 extending outwardly from the tube 16 with respect to the helix; two fins 18 extending from the tube 16 towards axis A1, an intermediate fin 19 which is arranged between fins 17; and an intermediate fin 20 which is arranged between fins 18. Fins 17, 18, 19, and 20 are continuous and substantially parallel to axis A2 and extend along the tube 16 at the helix.
  • the tube 16 comprises a wall 21 having an oval-shaped cross-section from which fins 17, 18, 19, and 20 protrude: fins 17 and 19 protrude from wall 21 on one side of the helix, more precisely fins 17 and 19 are directed outwardly from helix, whereas fins 18 and 20 protrudes from wall 21 inwardly towards axis A1 on the opposite side of the helix.
  • the tube 16 at the straight portions are free from fins 17, 18, 19, and 20 and the cross-section of tube 16 is progressively deformed into a circular cross-section to match the shape of the water conduit non shown in the enclosed Figures.
  • the cross-section of tube 16 has a major axis X and a minor axis Y.
  • Fins 18, 19, and 20 are all parallel to axis A2 of tube 16 and to major axis X, and are therefore parallel to one another.
  • Fins 19 and 20 are coplanar with each other, and substantially lie in the same plane as axis A2 of tube 16 and major axis X.
  • Fins 17 are arranged symmetrically with respect to major axis X and convergent one another towards the tube 16.
  • tube 16 is coiled about axis A1, so that axis A2 of tube 14 also assumes a helical shape.
  • This operation actually comprises calendering tube 16, with the minor axis Y of the cross-section of tube 16 ( Figures 5 ) maintained substantially parallel to axis A1.
  • the relatively small size of fins 17, 18, 19, and 20 does not hinder the calendering operation, and does not call for notching fins 17, 18, 19, and 20.
  • the turns 12 so formed are mutually spaced apart so as to define the gap 22 between turns 12.
  • Gap 22 defines a flow path for the combustion fumes to be travelled by the same combustion fumes either from the inside of the helix to the outside of the helix or from the outside of the helix to the inside of the helix.
  • the gap 22 comprises three gap portions 23, 24, and 25, wherein gap portion 23 is delimited by two fins 18, which belongs to two adjacent turns 12, and face each other; gap portion 24 is delimited by two tube wall portions 26, which belongs to two adjacent turns 12 and face each other; and gap portion 25 is delimited by two fins 18, which belongs to two adjacent turns 12, and face each other.
  • gap portion 23 is of substantially constant height H, where height H is parallel to axis A1 ( Figure 1 ), whereas gap portions 24 and 25 have variable height H along a radial direction with respect to axis A1 ( figure 1 ).
  • tube 16 is coiled with a constant pitch and radius, so that fins 17 and 18 and tube wall portion 26 of each turn 19 face fins 17 and 18 and tube wall portion 26 of the adjacent turns 12.
  • the gap 22 narrows at gap portions 24 because of the convexity of tube wall portions 26.
  • the convexity of tube wall portions 26 shapes gap portion 24 as a Venturi-tube.
  • the convergence of fins 17 determines a divergent-shape of gap portion 25.
  • gap 22 is confined between two facing surfaces 27, wherein each of said surfaces 27 has in succession a flat portion 28 at said fins 18, a convex portion 29 at said tube wall portion 26, and a flat portion 30 at said fins 17.
  • the transitions between the flat portions 28 and 30 and the convex portion include surface discontinuities that contribute in promoting the turbulent motion of the combustion fumes flowing through the gap 22.
  • the gap portion 24 produces a Venturi effect which rapidly accelerates the combustion fumes, whereas gap portion 25 suddenly decelerates the combustion fumes and further promotes their turbulent motion.
  • Fins 17 therefore not only increase, the exchange surface of tube 16, but also favour turbulent motion of the combustion fumes and improve the heat exchange at the fins 17.
  • each surface flat portion 30 forms and angle a of 2° with respect the major axis X, however angle a comprised in the range of 1° to 10° are considered acceptable.
  • H varies between a minimum value H min and a maximum value H max and the ratio between maximum value and minimum value (H max /H min ) is higher than 2 and preferably equal to 3.
  • fins 17 are locally deformed at several locations so as to locally bring two adjacent turns 12 into mutual contact and keep the remainder of the turns 12 mutually spaced apart in accordance with a given configuration.
  • fins 17 are locally deformed to be divergent so as to define contact surface areas 31, which are preferably evenly distributed along fins 17. Such solution for spacing turns 12 does not call for additional spacer and is extremely easy to be implemented.
  • the local deformations are made along fins 18 by making contact surface areas 32 along locally deformed portions of fins 18 as shown in Figure 8 .
  • the condensation heat exchanger 1 as described above may also be used in condensation boilers comprising a main exchanger, and in which the condensation heat exchanger 1 provides solely for condensing the combustion fumes, as opposed to acting as a combustion chamber as in the example described.
  • the condensation heat exchanger 1 as described above has numerous advantages, by combining straightforward construction as a result of the fins being formed directly by the tube extrusion process, as opposed to being added on after extrusion with a high degree of thermal efficiency by virtue of the fins increasing the exchange surface, and the dynamic effect on the fumes of the fins in combination with the tube.
  • condensation heat exchanger 1 is relatively easy to produce, and can be produced in different lengths to meet different power requirements. For which purpose, lengths along axis A1 can be produced which are multiples of a base length.
  • the spacers are self contained in the elongated hollow member and easy to produce. This solution may find application also in elongated hollow members including longitudinal fins having a different shape from those herein described.

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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)

Claims (9)

  1. Elément creux allongé (3) pour échangeur de chaleur à condensation pour chaudière à gaz à condensation servant à produire de l'eau chaude, dans lequel l'eau peut circuler dans l'élément creux allongé (3) et les fumées de combustion peuvent circuler autour dudit élément creux allongé (3) ; ledit élément creux allongé (3) étant au moins en partie enroulé en hélice autour d'un premier axe (A1) pour former une succession de spires espacées (12) définissant un espace (22) devant être parcouru par les fumées de combustion, et s'étend le long d'un deuxième axe (A2) ; l'élément creux allongé (3) comprenant un tube (16) qui s'étend le long du deuxième axe (A2), et au moins deux premières ailettes (17), qui s'étendent le long du deuxième axe (A2), font saillie depuis le tube (16) et sont formées de façon à définir entre elles une partie d'espace divergent (25) dudit espace (22) dans une direction radiale par rapport au premier axe (A1) ;
    l'élément creux allongé (3) étant caractérisé en ce que ledit tube (16) est de section ovale avec un axe principal (X) et un axe secondaire (Y), lesdites premières ailettes (17) convergeant vers ledit axe principal (X) et formant un angle (a) avec l'axe principal (X), ledit angle (a) étant compris dans un intervalle de 1° à 10° et étant de préférence égal à 2°.
  2. Elément creux allongé selon la revendication 1, dans lequel lesdites premières ailettes (17) sont convergentes depuis ledit tube (16).
  3. Elément creux allongé selon l'une des revendications précédentes, dans lequel ledit espace (22) a une hauteur (H) qui varie entre une valeur minimale (Hmin) et une valeur maximale (Hmax), et le rapport entre lesdites valeurs maximale et minimale (Hmax/Hmin) est supérieur à 2 et de préférence égal à 3.
  4. Elément creux allongé selon l'une quelconque des revendications précédentes, dans lequel lesdites premières ailettes (17) sont déformées localement afin de maintenir lesdites spires (12) mutuellement espacées selon une configuration donnée.
  5. Elément creux allongé selon la revendication 4, dans lequel lesdites premières ailettes (17) sont localement divergentes depuis ledit tube (16) afin de former un nombre d'aires de contact (31) le long desdites premières ailettes (17).
  6. Elément creux allongé selon l'une quelconque des revendications précédentes, comprenant deux deuxièmes ailettes (18), qui sont parallèles audit deuxième axe (A2), sont formées d'un seul tenant avec ledit tube (16), se font face et s'étendent dudit tube (16) vers le premier axe (A1).
  7. Elément creux allongé selon la revendication 6, dans lequel lesdites deuxièmes ailettes (18) sont déformées localement afin de maintenir lesdites spires (12) mutuellement espacées selon une configuration donnée.
  8. Elément creux allongé selon la revendication 7, dans lequel lesdites deuxièmes ailettes (18) sont localement divergentes depuis ledit tube (18) afin de former un nombre d'aires de contact (32) le long desdites deuxièmes ailettes (18).
  9. Echangeur de chaleur à condensation comprenant une enveloppe substantiellement cylindrique (2) et un élément creux allongé (3) fabriqué selon l'une quelconque des revendications précédentes et logé dans ladite enveloppe (2).
EP09787747.6A 2009-06-05 2009-06-05 Élément creux allongé pour échangeur de chaleur à condensation d'une chaudière à gaz à condensation pour produire de l'eau chaude Not-in-force EP2438363B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09787747T PL2438363T3 (pl) 2009-06-05 2009-06-05 Podłużny element wydrążony do kondensacyjnego wymiennika ciepła gazowego kotła kondensacyjnego do wytwarzania ciepłej wody

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2009/000245 WO2010140175A2 (fr) 2009-06-05 2009-06-05 Élément creux allongé pour échangeur de chaleur à condensation d'une chaudière à gaz à condensation pour produire de l'eau chaude

Publications (2)

Publication Number Publication Date
EP2438363A2 EP2438363A2 (fr) 2012-04-11
EP2438363B1 true EP2438363B1 (fr) 2014-10-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09787747.6A Not-in-force EP2438363B1 (fr) 2009-06-05 2009-06-05 Élément creux allongé pour échangeur de chaleur à condensation d'une chaudière à gaz à condensation pour produire de l'eau chaude

Country Status (4)

Country Link
EP (1) EP2438363B1 (fr)
ES (1) ES2525946T3 (fr)
PL (1) PL2438363T3 (fr)
WO (1) WO2010140175A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1403941B1 (it) * 2011-02-16 2013-11-08 Riello Spa Scambiatore di calore condensante per una caldaia a gas
EP2738505A1 (fr) * 2012-11-30 2014-06-04 Carlos Quesada Saborio Élément de tubage pour supports d'échangeur de chaleur
ITTO20130927A1 (it) * 2013-11-15 2015-05-16 Elbi Int Spa Scambiatore di calore, in particolare per una caldaia a condensazione

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL1750070T3 (pl) * 2005-08-05 2012-10-31 Elbi Int Spa Kocioł gazowy wyposażony w wymiennik ciepła z użebrowaną rurą i sposób jego wytwarzania
ITMI20071331A1 (it) * 2007-07-04 2009-01-05 Fondital Spa Scambiatore di calore per una caldaia a gas e caldaia a gas, in particolare caldaia a condensazione, provvista di tale scambiatore di calore

Also Published As

Publication number Publication date
ES2525946T3 (es) 2015-01-02
WO2010140175A3 (fr) 2011-11-10
EP2438363A2 (fr) 2012-04-11
WO2010140175A2 (fr) 2010-12-09
PL2438363T3 (pl) 2015-03-31

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