EP1703226B1 - Heat exchanger with optimized heat transfer elements - Google Patents
Heat exchanger with optimized heat transfer elements Download PDFInfo
- Publication number
- EP1703226B1 EP1703226B1 EP20050112088 EP05112088A EP1703226B1 EP 1703226 B1 EP1703226 B1 EP 1703226B1 EP 20050112088 EP20050112088 EP 20050112088 EP 05112088 A EP05112088 A EP 05112088A EP 1703226 B1 EP1703226 B1 EP 1703226B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat
- heat transfer
- transverse
- heat exchanger
- transfer elements
- 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.)
- Expired - Fee Related
Links
- 239000000567 combustion gas Substances 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 4
- 239000008236 heating water Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 2
- 238000007373 indentation Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000002737 fuel gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0005—Details for water heaters
- F24H9/001—Guiding means
- F24H9/0026—Guiding means in combustion gas channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
- F24H1/24—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers
- F24H1/26—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating with water mantle surrounding the combustion chamber or chambers the water mantle forming an integral body
Definitions
- the invention relates to a heat exchanger with optimized heat transfer elements for the transfer of heat from a combustion gas through a heat transferring wall on flowing on the outside of the wall in flow channels heating water according to the preamble of claim 1.
- a heat exchanger having fin and pin shaped heat transfer elements for transferring heat from a combustion gas through a wall to a heating water flowing in flow channels on the outside of the wall.
- the rib and pin-shaped heat transfer elements are arranged opposite one another on the inside of the wall and run in a single direction.
- a combustion chamber is formed, in which the fuel gas of a burner is burned.
- the combustion chamber is adjoined in the direction of flow of the combustion gas in a series formed rib-shaped heat transfer elements.
- a plurality of rows of pin-shaped heat transfer elements are formed, wherein the pin-shaped heat transfer elements of the individual rows are arranged offset from one another.
- the pin-shaped heat transfer elements are in several rows successively arranged further pin-shaped heat transfer elements, which are, however, spaced closer than the upstream pin-shaped heat transfer elements.
- a heat exchanger with heat transfer elements in which the heat transfer elements are integrally formed on the inside of the heat-transferring wall and extend into a combustion gas flowing through the flue gas.
- the heat transfer elements are integrally formed on the inside of the heat-transferring wall and extend into a combustion gas flowing through the flue gas.
- at least one transverse heat transfer element is designed with a cross section which has a greater extent transverse to the flow direction of the combustion gas as parallel to the flow direction of the combustion gas.
- Object of the present invention is to achieve an increase in the heat transfer performance of the heat exchanger, wherein the heat resistance of the heat transfer elements must be ensured under consideration of the required efficiency.
- the course of the heat transfer elements in only one direction should be maintained.
- the object of the invention is achieved with the characterizing features of claim 1.
- the ratio of surface to administratleitquerites is reduced compared with a pin-shaped heat transfer element with in the vertical and horizontal direction almost the same extent.
- the thermal load of the heat transfer elements is reduced. This protects the heat transfer element from overheating.
- a flow deflection of the combustion gases is achieved at this point, thereby achieving the reduction of heat transfer to the thermally highly loaded heat transfer element.
- the transverse to the flow direction of the combustion gas heat transfer element thus acts mainly for the flow deflection of the combustion gas.
- the flow in the region of the thermally highly loaded heat transfer elements is greatly slowed by a partial shut-off of the flow cross-section at this point. This reduces the flow velocity and thus the heat transfer coefficient at the thermally highly loaded heat transfer elements.
- By the transverse heat transfer elements also a deflection of the combustion gases is achieved in less thermally highly loaded areas of the heat exchanger.
- the essential advantage of the invention is also that the Strömungsleitgeometrie is achieved to increase the performance of the heat exchanger without additional components and can be realized by cast-on rib and / or pin-shaped heat transfer elements.
- the transverse to the flow direction of the combustion gas has at least twice as large extent as parallel to the flow direction of the combustion gas.
- the transversely located heat transfer element is upstream in the flow direction of the combustion gas extending in the flow direction extended rib-shaped heat transfer element.
- the transverse heat transfer element has a trough-shaped surface opposite to the flow direction, wherein the trough-shaped surface is substantially a negative image of the opposite surface of the upstream elongate rib-shaped heat transfer element.
- a substantial increase in the heat transfer performance is achieved if four transverse heat transfer elements are arranged in a direction perpendicular to the flow direction of the combustion gas level of Thompsonyakes, each extending two transverse heat transfer elements from the opposite side of the heat transferring wall in the same direction.
- the flow cross-section of the heating gas train is extended in the direction of low-loaded thermal regions of the heat exchanger. It is particularly advantageous if the heat exchanger is produced by casting from a metallic material and if at least the transverse heat transfer element is cast onto the heat-transferring wall.
- FIG. 1 illustrated heat exchanger for a heater in particular for a condensing boiler, has a base body 10 with a heat-transferring wall 11 and with a burner-side opening 15 and an exhaust-side opening 16.
- a burner not shown, is used, in which a fuel gas / air mixture is burned.
- the adjoining the burner space within the body 10 forms a combustion chamber 17, in which the combustible gas / air mixture is burned.
- a heating gas duct 19 Connected to the combustion chamber 17 within the main body 10 is a heating gas duct 19, through which the combustion gas flows to the exhaust-gas-side opening 16.
- heat transfer elements are arranged, which protrude into the heating gas 19 and will be discussed in more detail later.
- On the outside of the heat-transferring wall 11 extends helically a trench-shaped recess 23 which is initially open on the base body 10 to the outside.
- the base body is surrounded by a jacket, not shown, so that the trench-shaped recess 23 forms a helically extending flow channel for heating water of a heating circuit, not shown, of the heater.
- the main body 10 is a light metal casting, preferably an aluminum sand casting component, which is particularly suitable as a material for heat exchangers of heaters due to its corrosion resistance and heat absorption and thermal conductivity.
- the main body 10 is designed with a circular cross-section and is slightly conical in the flow direction of the combustion gas with decreasing diameter. However, it is just as conceivable to carry out the basic body 10 cylindrically or with an oval cross-section.
- the heat transfer elements projecting into the heating gas duct 19 have different cross-sectional shapes, the different cross-sectional shapes being arranged in different sections 31, 32 and 33 of the heating gas duct 19.
- First section 31 are formed in the flow direction extending rib-shaped heat transfer elements 34 and, for example, four elongated rib-shaped heat transfer element 40.
- second section 32 are pin-shaped heat transfer elements 35 and, for example, four transverse heat transfer elements 50 are arranged.
- the third section 33 adjoining the second section there are further pin-shaped heat transfer elements 36.
- the elongated rib-shaped heat transfer elements 40 are formed from a rib-shaped heat transfer element 34 and a subsequent pin-shaped heat transfer element 35, wherein at the transition from the rib-shaped heat transfer element to the pin-shaped heat transfer element, a mutual notch is formed.
- the further pin-shaped heat transfer elements 36 have a cross section with a curved surface facing the flow and a flat surface facing in the flow direction.
- the extended rib-shaped heat transfer elements 40 arranged in the first section 31 are arranged upstream of the transverse heat transfer elements 50 arranged in the second section 32 in the flow direction.
- the transverse heat transfer elements 50 have according to FIG. 3 a cross-section, which originates in its outer contour substantially to two adjacent pin-shaped heat transfer elements 35 which are interconnected, wherein between a surface having a trough-shaped recess 51 is formed, which substantially to the shape of the opposite surface of the upstream extended rib-shaped heat transfer element 40th is adjusted.
- the downstream surface of the transverse heat transfer element 50 is provided with two flats 52 between which a notch 53 is centrally formed.
- the various heat transfer elements are respectively formed on the inside of the heat-transferring wall 11 and each extending from the opposite side of the heat-transferring wall 11 in a single direction ( FIG. 2 ).
- the various heat transfer elements are produced by casting together with the heat exchanger, so that at least the transverse heat transfer elements 50 and the extended rib-shaped heat transfer elements 40 are cast onto the heat-transferring wall 11.
- a Cavity 38 is present, in which an unillustrated displacement body is used, through which the combustion gas is forced in the direction of formed between the heat transfer elements 19 Schugaszuges.
Description
Die Erfindung betrifft einen Wärmetauscher mit optimierten Wärmeübertragungselementen für die Übertragung von Wärme aus einem Verbrennungsgas durch eine wärmeübertragende Wand auf an der Außenseite der Wand in Strömungskanälen strömenden Heizungswasser nach dem Oberbegriff des Anspruchs 1.The invention relates to a heat exchanger with optimized heat transfer elements for the transfer of heat from a combustion gas through a heat transferring wall on flowing on the outside of the wall in flow channels heating water according to the preamble of claim 1.
Aus
Weiterhin ist aus der
Aufgabe der vorliegenden Erfindung ist es, eine Erhöhung der Wärmeübertragungsleistung des Wärmetauschers zu erzielen, wobei unter Beachtung des geforderten Wirkungsgrades die Wärmefestigkeit der Wärmeübertragungselemente gewährleistet werden muss. Außerdem sollte wegen der einfachen gießtechnischen Herstellung des Wärmetauschers der Verlauf der Wärmeübertragungselemente in nur einer Richtung beibehalten werden.Object of the present invention is to achieve an increase in the heat transfer performance of the heat exchanger, wherein the heat resistance of the heat transfer elements must be ensured under consideration of the required efficiency. In addition, because of the simple production by casting the heat exchanger, the course of the heat transfer elements in only one direction should be maintained.
Die Aufgabe der Erfindung wird mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Durch die Ausbildung mindestens eines Wärmeübertragungselementes mit einer quer zur Strömungsrichtung des Verbrennungsgases größeren Ausdehnung als parallel zur Strömungsrichtung des Verbrennungsgases wird das Verhältnis von Oberfläche zu Wärmeleitquerschnitt verringert im Vergleich mit einem stiftförmigen Wärmeübertragungselement mit in senkrechter und waagerechter Richtung nahezu gleicher Ausdehnung. Die thermische Belastung der Wärmeübertragungselemente wird dabei verringert. Dadurch wird das Wärmeübertragungselement vor Überhitzung geschützt. Durch das quer zur Strömungsrichtung sich erstreckende Wärmeübertragungselement wird eine Strömungsumlenkung der Verbrennungsgase an dieser Stelle erzielt und dadurch die Verringerung des Wärmeübergangs an dem thermisch hoch belasteten Wärmeübertragungselement erreicht. Das quer zur Strömungsrichtung des Verbrennungsgases liegende Wärmeübertragungselement wirkt somit hauptsächlich zur Strömungsumlenkung des Verbrennungsgases. Die Strömung im Bereich der thermisch hoch belasteten Wärmeübertragungselemente wird durch ein teilweises Absperren des Strömungsquerschnittes an dieser Stelle stark gebremst. Dadurch verringert sich die Strömungsgeschwindigkeit und damit die Wärmeübergangszahl an den thermisch hoch belasteten Wärmeübertragungselementen. Durch die quer liegenden Wärmeübertragungselemente wird außerdem eine Umlenkung der Verbrennungsgase in weniger thermisch hoch belastete Bereiche des Wärmetauschers erzielt. Der wesentliche Vorteil der Erfindung besteht außerdem darin, dass die Strömungsleitgeometrie zur Erhöhung der Leistung des Wärmetauschers ohne zusätzliche Bauteile erreicht wird und durch angegossene rippen- und/oder stiftförmige Wärmeübertragungselemente realisierbar ist.The object of the invention is achieved with the characterizing features of claim 1. By forming at least one heat transfer element with a transverse to the flow direction of the combustion gas expansion as parallel to the flow direction of the combustion gas, the ratio of surface to Wärmeleitquerschnitt is reduced compared with a pin-shaped heat transfer element with in the vertical and horizontal direction almost the same extent. The thermal load of the heat transfer elements is reduced. This protects the heat transfer element from overheating. By the transverse to the flow direction extending heat transfer element, a flow deflection of the combustion gases is achieved at this point, thereby achieving the reduction of heat transfer to the thermally highly loaded heat transfer element. The transverse to the flow direction of the combustion gas heat transfer element thus acts mainly for the flow deflection of the combustion gas. The flow in the region of the thermally highly loaded heat transfer elements is greatly slowed by a partial shut-off of the flow cross-section at this point. This reduces the flow velocity and thus the heat transfer coefficient at the thermally highly loaded heat transfer elements. By the transverse heat transfer elements also a deflection of the combustion gases is achieved in less thermally highly loaded areas of the heat exchanger. The essential advantage of the invention is also that the Strömungsleitgeometrie is achieved to increase the performance of the heat exchanger without additional components and can be realized by cast-on rib and / or pin-shaped heat transfer elements.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen der Erfindung möglich. Als eine besonders zweckmäßige Ausführungsform hat sich eine Geometrie des quer liegenden Wärmeübertragungselements mit einem Querschnitt ergeben, der quer zur Strömungsrichtung des Verbrennungsgases eine mindestens doppelt so große Ausdehnung besitzt als parallel zur Strömungsrichtung des Verbrennungsgases. Als weiterhin zweckmäßig hat sich herausgestellt, dass dem quer liegenden Wärmeübertragungselement in Strömungsrichtung des Verbrennungsgases ein sich in Strömungsrichtung erstreckendes verlängertes rippenförmiges Wärmeübertragungselement vorgelagert ist. Dadurch wird dem thermisch hochbelasteten quer liegenden Wärmeübertragungselement ein weiteres Wärmeübertragungselement mit ebenfalls günstigem Verhältnis von Oberfläche und Wärmeleitquerschnitt zugeordnet, so dass dadurch der Wärmeübergang in dieser Stelle noch weiter verringert und eine Überhitzung der Wärmeübertragungselemente an dieser Stelle vermieden wird. Gemäß der Erfindung weist das quer liegende Wärmeübertragungselement entgegen der Strömungsrichtung eine muldenförmige Oberfläche auf, wobei die muldenförmige Oberfläche im Wesentlichen ein negatives Abbild der gegenüberliegenden Oberfläche des vorgelagerten verlängerten rippenförmigen Wärmeübertragungselements ist. Eine wesentliche Erhöhung der Wärmeübertragungsleistung wird erzielt, wenn in einer senkrecht zur Strömungsrichtung des Verbrennungsgases liegenden Ebene des Heizgaszuges vier quer liegende Wärmeübertragungselemente angeordnet sind, wobei sich jeweils zwei quer liegende Wärmeübertragungselemente von der gegenüberliegenden Seite der wärmeübertragenden Wand aus in gleicher Richtung erstrecken. Außerdem ist es zweckmäßig, wenn benachbart zu den quer liegenden Wärmeübertragungselementen der Strömungsquerschnitt des Heizgaszuges in Richtung niedrig belasteter thermischer Bereiche des Wärmeübertragers erweitert ausgeführt wird. Besonders vorteilhafte ist, wenn der Wärmetauscher gießtechnisch aus einem metallischen Werkstoff hergestellt wird und wenn zumindest das quer liegende Wärmeübertragungselement an die wärmeübertragende Wand angegossen ist.The measures listed in the dependent claims advantageous developments of the invention are possible. As a particularly advantageous embodiment a geometry of the transverse heat transfer element with a cross-section result, the transverse to the flow direction of the combustion gas has at least twice as large extent as parallel to the flow direction of the combustion gas. As further expedient it has been found that the transversely located heat transfer element is upstream in the flow direction of the combustion gas extending in the flow direction extended rib-shaped heat transfer element. As a result, the thermally highly loaded transverse heat transfer element is assigned a further heat transfer element with likewise favorable ratio of surface and Wärmeleitquerschnitt, thereby further reducing the heat transfer in this point and overheating of the heat transfer elements is avoided at this point. According to the invention, the transverse heat transfer element has a trough-shaped surface opposite to the flow direction, wherein the trough-shaped surface is substantially a negative image of the opposite surface of the upstream elongate rib-shaped heat transfer element. A substantial increase in the heat transfer performance is achieved if four transverse heat transfer elements are arranged in a direction perpendicular to the flow direction of the combustion gas level of Heizgaszuges, each extending two transverse heat transfer elements from the opposite side of the heat transferring wall in the same direction. In addition, it is expedient if, adjacent to the transverse heat transfer elements, the flow cross-section of the heating gas train is extended in the direction of low-loaded thermal regions of the heat exchanger. It is particularly advantageous if the heat exchanger is produced by casting from a metallic material and if at least the transverse heat transfer element is cast onto the heat-transferring wall.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:
- Figur 1
- einen Längsschnitt durch einen erfindungsgemäßen Wärmetauscher,
- Figur 2
- einen Schnitt nach der Linie II-II in
Figur 1 und
- Figur 3
- eine vergrößerte Schnittdarstellung durch ein quer liegendes Wärmeübertragungselement.
- FIG. 1
- a longitudinal section through a heat exchanger according to the invention,
- FIG. 2
- a section along the line II-II in
FIG. 1 and
- FIG. 3
- an enlarged sectional view through a transverse heat transfer element.
Der in
An der Innenseite der wärmeübertragenden Wand 11 sind Wärmeübertragungselemente angeordnet, die in den Heizgaszug 19 hineinragen und auf die später noch näher eingegangen wird. An der Außenseite der wärmeübertragenden Wand 11 verläuft wendelförmig eine grabenförmige Vertiefung 23, die am Grundkörper 10 nach außen hin zunächst offen ist. Zum Verschließen der nach außen hin offenen Vertiefung 23 ist der Grundkörper von einem nicht dargestellten Mantel umgeben, sodass die grabenförmige Vertiefung 23 einen wendelförmig verlaufenden Strömungskanal für Heizungswasser eines nicht dargestellten Heizkreises des Heizgerätes bildet.On the inside of the heat-transferring
Der Grundkörper 10 ist Leichtmetall-Gussteil, vorzugsweise ein Aluminium-Sandguss-Bauteil, das sich aufgrund seiner Korrosionsbeständigkeit sowie Wärmeaufnahmefähigkeit und Wärmeleitfähigkeit besonders als Material für Wärmetauscher von Heizgeräten eignet. Der Grundkörper 10 ist mit einem kreisförmigen Querschnitt ausgeführt und verläuft in Strömungsrichtung des Verbrennungsgases mit abnehmendem Durchmesser leicht konisch. Es ist aber genauso denkbar, den Grundkörper 10 zylindrisch oder mit einem ovalen Querschnitt auszuführen.The
Die in den Heizgaszug 19 hineinragenden Wärmeübertragungselemente weisen verschiedene Querschnittsformen auf, wobei die verschiedenen Querschnittsformen in unterschiedlichen Abschnitten 31, 32 und 33 des Heizgaszuges 19 angeordnet sind. In dem an die Brennkammer 17 in Strömungsrichtung des Verbrennungsgases sich anschließenden ersten Abschnitt 31 sind in Strömungsrichtung erstreckende rippenförmige Wärmeübertragungselemente 34 sowie bspw. vier verlängerte rippenförmige Wärmeübertragungselement 40 ausgebildet. Im sich daran anschließenden zweiten Abschnitt 32 sind stiftförmige Wärmeübertragungselemente 35 sowie bspw. vier quer liegende Wärmeübertragungselemente 50 angeordnet. In dem sich an den zweiten Abschnitt anschließenden dritten Abschnitt 33 befinden sich weitere stiftförmige Wärmeübertragungselemente 36.The heat transfer elements projecting into the
Die verlängerten rippenförmigen Wärmeübertragungselemente 40 sind aus einem rippenförmigen Wärmeübertragungselement 34 und einem sich anschließenden stiftförmigen Wärmeübertragungselement 35 geformt, wobei beim Übergang vom rippenförmigen Wärmeübertragungselement zum stiftförmigen Wärmeübertragungselement eine beiderseitige Einkerbung ausgebildet ist. Die weiteren stiftförmigen Wärmeübertragungselemente 36 weisen einen Querschnitt mit einer entgegen der Strömung weisenden gewölbten Oberfläche und einer in Strömungsrichtung weisenden ebenen Oberfläche auf.The elongated rib-shaped
Die im ersten Abschnitt 31 angeordneten verlängerten rippenförmigen Wärmeübertragungselemente 40 sind den im zweiten Abschnitt 32 angeordneten quer liegenden Wärmeübertragungselementen 50 in Strömungsrichtung vorgelagert. Die quer liegenden Wärmeübertragungselemente 50 weisen gemäß
Die verschiedenen Wärmeübertragungselemente sind jeweils an der Innenseite der wärmeübertragenden Wand 11 angeformt und erstrecken sich jeweils von der gegenüberliegenden Seite der wärmeübertragenden Wand 11 in eine einzige Richtung (
Claims (7)
- A heat exchanger having heat transfer elements for the transfer of heat from a combustion gas through a heat-transferring wall (11) to heating water flowing in flow channels on the outer side of the heat-transferring wall (11), wherein the heat-transfer elements are formed on the inner side of the heat-transferring wall (11) and extend in a heating gas flue (19) through which the combustion gas flows and wherein in one section of the heating gas flue (19), at least one transverse heat-transfer element (50) is designed with a cross-section which has a greater expansion transverse to the flow direction of the combustion gas than parallel to the flow direction of the combustion gas, characterised in that the transverse heat-transfer element (50) has a surface having a trough-shaped recess (51) in the direction opposite to the flow direction of the combustion gas.
- The heat exchanger according to claim 1, characterised in that the surface of the trough-shaped recess (51) is substantially a negative image of an opposite surface of an upstream heat-transfer element in the flow direction.
- The heat exchanger according to claim 1 or 2, characterised in that the transverse heat-transfer element (50) downstream has a surface having two flattened sections (52) between which an indentation (53) is formed centrally.
- The heat exchanger according to any one of the preceding claims, characterised in that in a plane of the heating gas flue (19) located perpendicular to the flow direction of the combustion gas, four transverse heat-transfer elements (50) are located, wherein respectively two transverse heat transfer elements (50) extend from the opposite heat-transferring side of the heat-transferring wall (11) in the same direction.
- The heat exchanger according to any one of the preceding claims, characterised in that an extended fin-shaped heat-transfer element (40) extending in the flow direction is mounted upstream of the transverse heat transfer element (50) in the flow direction of the combustion gas.
- The heat exchanger according to any one of the preceding claims, characterised in that adjacent to the transverse heat transfer elements (50), the flow cross-section of the heating gas flue (19) is expanded in the direction of the low-loaded thermal regions of the heat exchanger.
- The heat exchanger according to any one of the preceding claims, characterised in that the heat exchanger is made from a metal material by casting and that at least the transverse heat-transfer element (50) is cast onto the heat-transferring wall (11).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200510004740 DE102005004740B3 (en) | 2005-02-02 | 2005-02-02 | Heat exchanger for hot water heating has in one section of hot gas flue at least one transversely lying heat transfer element with cross section with larger extent at right angles to direction of exhaust gas flow than that parallel to it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1703226A1 EP1703226A1 (en) | 2006-09-20 |
| EP1703226B1 true EP1703226B1 (en) | 2011-07-27 |
Family
ID=36286174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20050112088 Expired - Fee Related EP1703226B1 (en) | 2005-02-02 | 2005-12-14 | Heat exchanger with optimized heat transfer elements |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1703226B1 (en) |
| DE (1) | DE102005004740B3 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR957533A (en) * | 1950-02-23 | |||
| US1855777A (en) * | 1928-03-28 | 1932-04-26 | Bryant Heater & Mfg Company | Boiler section |
| DE9017405U1 (en) * | 1990-12-22 | 1991-03-21 | Buderus Heiztechnik Gmbh, 6330 Wetzlar, De | |
| DE10013608C2 (en) * | 2000-03-18 | 2002-01-31 | Bosch Gmbh Robert | Heat exchanger for a gas condensing boiler |
| DE10255464A1 (en) * | 2002-11-28 | 2004-06-09 | Robert Bosch Gmbh | Heat exchanger for a heater |
| DE10306699A1 (en) * | 2003-02-18 | 2004-09-02 | Robert Bosch Gmbh | Heat exchanger with a flow-optimized heat-absorbing flow channel, in particular for a heater |
-
2005
- 2005-02-02 DE DE200510004740 patent/DE102005004740B3/en not_active Expired - Fee Related
- 2005-12-14 EP EP20050112088 patent/EP1703226B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE102005004740B3 (en) | 2006-06-14 |
| EP1703226A1 (en) | 2006-09-20 |
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