WO2010140175A2 - Elongated hollow member for a condensation heat exchanger of a gas condensation boiler for producing hot water - Google Patents

Elongated hollow member for a condensation heat exchanger of a gas condensation boiler for producing hot water Download PDF

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Publication number
WO2010140175A2
WO2010140175A2 PCT/IT2009/000245 IT2009000245W WO2010140175A2 WO 2010140175 A2 WO2010140175 A2 WO 2010140175A2 IT 2009000245 W IT2009000245 W IT 2009000245W WO 2010140175 A2 WO2010140175 A2 WO 2010140175A2
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WO
WIPO (PCT)
Prior art keywords
elongated hollow
fins
axis
tube
gap
Prior art date
Application number
PCT/IT2009/000245
Other languages
French (fr)
Other versions
WO2010140175A3 (en
Inventor
Stefano Casiraghi
Christian Cannas
Original Assignee
Riello S.P.A.
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 S.P.A. filed Critical Riello S.P.A.
Priority to PCT/IT2009/000245 priority Critical patent/WO2010140175A2/en
Publication of WO2010140175A2 publication Critical patent/WO2010140175A2/en
Publication of WO2010140175A3 publication Critical patent/WO2010140175A3/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H1/00Water heaters having heat generating means, e.g. boiler, flow- heater, water-storage heater
    • F24H1/22Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating
    • F24H1/40Water heaters other than continuous-flow or water storage heaters, e.g. water-heaters for central heating with water tube or tubes
    • F24H1/43Water 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H9/00Details
    • F24H9/0005Details for water heaters
    • F24H9/001Guiding means
    • F24H9/0026Guiding means in combustion gas channels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02Heat-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
    • F28D7/024Heat-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00Tubular elements; Assemblies of tubular elements
    • F28F1/02Tubular elements of cross-section which is non-circular
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00Tubular elements; Assemblies of tubular elements
    • F28F1/10Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12Tubular 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
    • F28F1/14Tubular 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
    • F28F1/16Tubular 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/08Arrangements 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

Abstract

An elongated hollow member (3) for a condensation heat exchanger (1) for a gas condensation boiler for producing hot water, wherein the water flows in the elongated hollow member (3) and combustion fumes flow about the elongated hollow member (3), is, at least partly, coiled in a helix about a first axis (A1) to form a succession of spaced apart turns (12) defining a gap (2) to be travelled by the combustion fumes, extends along a second axis (A2); and has a tube (16) extending along the second axis (A2), and, at least, two fins (17), which extend along the second axis (A2), protrude from the tube (16), and are so shaped so as to define there between a diverging gap portion (25) of gap (22) in a radial direction with respect to the first axis (A1).

Description

ELONGATED HOLLOW MEMBER FOR A CONDENSATION HEAT EXCHANGER OF A GAS CONDENSATION BOILER FOR PRODUCING HOT WATER
TECHNICAL FIELD The present invention relates 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. BACKGROUND ART
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. This type of condensation heat exchangers is disclosed in documents EP 678,186 Bl and EP 1,281,919 A2.
In another type of condensation heat exchangers, the elongated hollow member comprises a tube and fins perpendicular to the second axis. This technical solution provides for a high rate of thermal exchange, but the fins are expensive to produce.
In a further type of condensation heat exchangers disclosed in documents EP 1,627,190 Bl; EP 1,600,708 Al; EP 1,750,069 Al; EP 1,750,070, and EP 1,752,718 Al, the elongated hollow member comprises a tube, and fins, which are parallel to the second axis and are integrally made with the tube. In this case, 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. In fact, the above-identified elongated hollow member including co-extruded-fins proved to be extremely effective in term of heat exchange rate. However, the market of condensation boiler demands for an even higher thermal exchange rate . In other words , 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. DISCLOSURE OF INVENTION
In the light of the above market demand, 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. According to the present invention, there is provided an elongated hollow member for a condensation heat exchanger for a gas boiler for producing hot water, wherein the water flows in the elongated hollow member and combustion fumes flow about the elongated hollow member; said elongated hollow member being, at least partly, coiled in a helix about a first axis to form a succession of spaced apart turns defining a gap suitable to be travelled by the combustion fumes, and extends along a second axis; the elongated hollow member comprising a tube extending along the second axis, and at least two first fins, which extends along the second axis, protrude from said tube, and are so shaped so as to define there between a diverging gap portion in a radial direction with respect to the first axis . The diverging gap portion promotes the turbulent motion of the combustion fumes flow and, as a consequence, improves the thermal exchange at the first fins.
The experiment carried out by the applicant proved an increase of the thermal efficiency with respect to a configuration with a constant gap portion of at least 3%.
According to a preferred embodiment the first fins are locally deformed so as to keep said turns mutually spaced apart in accordance with a given configuration.
In accordance with a further preferred embodiment 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. In accordance with the above identified preferred embodiments, 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.
BRIEF DESCRIPTION OF THE DRAWINGS A non- limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
- Figure 1 shows a schematic side view, with parts in section and parts removed for clarity, of a condensation heat exchanger comprising an elongated hollow member in accordance with the present invention;
- Figure 2 shows a smaller-scale front view, with part removed for clarity, of the elongated hollow member of Figure 1 ; - Figure 3 shows a smaller-scale back view, with part removed for clarity, of the elongated hollow member of Figure 1 ;
- Figure 4 shows a smaller-scale side elevation view of the elongated hollow member of Figure 1; and - Figure 5 shows a larger-scale section view, with part removed for clarity, of a detail of the elongated hollow member of Figure 1;
- Figure 6 shows an even more larger-scale section view, with part removed for clarity, of a detail of Figure 5;
- Figure 7 shows a large scale section view, with part removed for clarity, of detail of the elongated hollow member of Figure 4 ; and
- Figure 8 shows a large scale section view, with part removed for clarity, of a detail of a variation of the elongated hollow member of Figure 7.
BEST MODE FOR CARRYING OUT THE INVENTION
In Figure 1, 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.
In the example shown in Figure 1, 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 Al. Casing 2 comprises a cylindrical wall 8 of axis Al; 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 Al .
The elongated hollow member 3 is partly coiled in a helix extending about axis Al 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. With reference to Figure 2, straight end 13 is a front end parallel to axis Al, whereas straight end 14 is a back end extending radially from helix with respect to axis Al. With reference to figure 1, 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 Al.
According to an alternative embodiment, not shown in the enclosed Figures, the intermediate plate is omitted and the fume evacuation conduit is connected to the cylindrical wall of the casing.
In any case, for the purposes of the present invention any suitable configurations for forcing the combustion fume to flow between the turns 12 is convenient. 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 Al, 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 Al on the opposite side of the helix. With reference to Figures 2 and 3, 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 .
With reference to Figure 5, at the helix 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.
With reference to Figure 4, once extruded with fins 17, 18, 19 and 20, tube 16 is coiled about axis Al, 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 Al. 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.
As better shown in Figures 5 and 6, 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. With reference to figure 6, gap portion 23 is of substantially constant height H, where height H is parallel to axis Al (Figure 1) , whereas gap portions 24 and 25 have variable height H along a radial direction with respect to axis Al (figure 1) . In particular, 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. In greater detail, 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. In other words, 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.
Once the combustion fumes are directed from the inside of the helix to the outside of the helix, 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.
According to tests conducted by the applicant, the gap 22 provides for optimum heat exchange when given dimensional ratios of the gap 22 are conformed with. With reference to Figure 6, 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 Hmin and a maximum value Hmax and the ratio between maximum value and minimum value (Hmax/Hrain) is higher than 2 and preferably equal to 3.
With reference to Figure 4, 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. In particular and as better shown in Figure 7, 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.
In alternative or in conjunction with the local deformations at fins 17, 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 .
Moreover, 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 Al can be produced which are multiples of a base length. Further, 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.
The present invention includes further variations not explicitly described but falling within the scope of the enclosed claims.

Claims

1. An elongated hollow member for a condensation heat exchanger for a gas condensation .boiler for producing hot water, wherein the water flows in the elongated hollow member (3) and combustion fumes flow about the elongated hollow member (3); said elongated hollow member (3) being, at least partly, coiled in a helix about a first axis (Al) to form a succession of spaced apart turns (19) defining a gap (22) to be travelled by the combustion fumes, and extends along a second axis (A2) ; the elongated hollow member (3) comprising a tube (16) extending along the second axis (A2) , and at least two first fins (17) , which extend along the second axis (A2) , protrude from the tube (16) , and are so shaped so as to define there between a diverging gap portion (25) of said gap (22) in a radial direction with respect to the first axis (Al) .
2. Elongated hollow member as claimed in claim 1, wherein said first fins (17) are convergent from said tube (16) .
3. Elongated hollow member as claimed in claim 1 or 2, wherein said tube (16) has an oval cross-section having a major axis (X) and a minor axis (Y) ; said fist fins (17) converging towards said major axis (X) and forming an angle (a) with the major axis (X) ; said angle (a) being within a range from 1° to 10° and preferably equal to 2°.
4. Elongated hollow member according to any one of the foregoing claims, wherein gap (22) has a height (H) that varies between a minimum value (Hmin) and a maximum value (Hmax) and the ratio between maximum value and minimum value (Hmax/Hmin) is higher than 2 and preferably equal to 3.
5. Elongated hollow member as claimed in any one of the foregoing claims, wherein said first fins (17) are locally deformed so as to keep said turns (12) mutually spaced apart in accordance with a given configuration.
6. Elongated hollow member as claimed in claim 5, wherein said first fins (17) are locally divergent from said tube (16) so as to form a number of contact surface areas (31) along said first fins (17) .
7. Elongated hollow member as claimed in any one of the foregoing claims comprising two second fins (18) , which are parallel to said second axis (A2) , are integrally made with said tube (16) , face each other and extends from said tube (16) towards the first axis (Al) .
8. Elongated hollow member as claimed in claim 7, wherein said second fins (18) are locally deformed so as to keep said turns (12) mutually spaced apart in accordance with a given configuration.
9. Elongated hollow member as claimed in claim 8, wherein said second fins (18) are locally divergent from said tube (18) so as to form a number of contact surface areas (32) along said second fins (18) .
10. Condensation heat exchanger comprising a substantially; cylindrical casing (2) and an elongated hollow member (3) made according to any one of the foregoing claims and housed in said casing (2) .
PCT/IT2009/000245 2009-06-05 2009-06-05 Elongated hollow member for a condensation heat exchanger of a gas condensation boiler for producing hot water WO2010140175A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2009/000245 WO2010140175A2 (en) 2009-06-05 2009-06-05 Elongated hollow member for a condensation heat exchanger of a gas condensation boiler for producing hot water

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ES09787747.6T ES2525946T3 (en) 2009-06-05 2009-06-05 Elongated hollow member for a condensing heat exchanger of a gas condensing boiler to produce hot water
EP09787747.6A EP2438363B1 (en) 2009-06-05 2009-06-05 Elongated hollow member for a condensation heat exchanger of a gas condensation boiler for producing hot water
PL09787747T PL2438363T3 (en) 2009-06-05 2009-06-05 Elongated hollow member for a condensation heat exchanger of a gas condensation boiler for producing hot water
PCT/IT2009/000245 WO2010140175A2 (en) 2009-06-05 2009-06-05 Elongated hollow member for a condensation heat exchanger of a gas condensation boiler for producing hot water

Publications (2)

Publication Number Publication Date
WO2010140175A2 true WO2010140175A2 (en) 2010-12-09
WO2010140175A3 WO2010140175A3 (en) 2011-11-10

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PCT/IT2009/000245 WO2010140175A2 (en) 2009-06-05 2009-06-05 Elongated hollow member for a condensation heat exchanger of a gas condensation boiler for producing hot water

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ES (1) ES2525946T3 (en)
PL (1) PL2438363T3 (en)
WO (1) WO2010140175A2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20110229A1 (en) * 2011-02-16 2012-08-17 Riello Spa Condensing heat exchanger for a gas boiler
ITTO20130927A1 (en) * 2013-11-15 2015-05-16 Elbi Int Spa Heat exchanger, especially for a condensing boiler
EP2941609A1 (en) * 2012-11-30 2015-11-11 Carlos Quesada Saborio Tubing element for a heat exchanger means

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2012072A2 (en) 2007-07-04 2009-01-07 FONDITAL S.p.A. Heat exchanger for a gas boiler and gas boiler, in particular a condensation boiler, provided with said heat exchanger

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL1750070T3 (en) * 2005-08-05 2012-10-31 Elbi Int Spa Gas boiler provided with a heat exchanger with finned tube and method of producing the same

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2012072A2 (en) 2007-07-04 2009-01-07 FONDITAL S.p.A. Heat exchanger for a gas boiler and gas boiler, in particular a condensation boiler, provided with said heat exchanger

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20110229A1 (en) * 2011-02-16 2012-08-17 Riello Spa Condensing heat exchanger for a gas boiler
EP2489955A1 (en) * 2011-02-16 2012-08-22 Riello S.p.A. Condensing heat exchanger for a gas boiler
EP2941609A1 (en) * 2012-11-30 2015-11-11 Carlos Quesada Saborio Tubing element for a heat exchanger means
ITTO20130927A1 (en) * 2013-11-15 2015-05-16 Elbi Int Spa Heat exchanger, especially for a condensing boiler
WO2015071872A1 (en) * 2013-11-15 2015-05-21 Elbi International S.P.A. Heat exchanger, in particular for a condensation boiler
US20160265808A1 (en) * 2013-11-15 2016-09-15 Elbi International S.P.A. Heat exchanger, in particular for a condensation boiler
US10119723B2 (en) 2013-11-15 2018-11-06 Elbi International S.P.A. Heat exchanger, in particular for a condensation boiler

Also Published As

Publication number Publication date
EP2438363A2 (en) 2012-04-11
WO2010140175A3 (en) 2011-11-10
EP2438363B1 (en) 2014-10-29
PL2438363T3 (en) 2015-03-31
ES2525946T3 (en) 2015-01-02

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