EP0772017A2 - Heat exchanger tube - Google Patents

Heat exchanger tube Download PDF

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Publication number
EP0772017A2
EP0772017A2 EP19960114202 EP96114202A EP0772017A2 EP 0772017 A2 EP0772017 A2 EP 0772017A2 EP 19960114202 EP19960114202 EP 19960114202 EP 96114202 A EP96114202 A EP 96114202A EP 0772017 A2 EP0772017 A2 EP 0772017A2
Authority
EP
European Patent Office
Prior art keywords
cross
heat exchanger
tube
section
exchanger tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19960114202
Other languages
German (de)
French (fr)
Other versions
EP0772017A3 (en
Inventor
Frank Dr.-Ing. Döring
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.)
Bosch Thermotechnik GmbH
Original Assignee
Buderus Heiztechnik GmbH
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 Buderus Heiztechnik GmbH filed Critical Buderus Heiztechnik GmbH
Publication of EP0772017A2 publication Critical patent/EP0772017A2/en
Publication of EP0772017A3 publication Critical patent/EP0772017A3/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/06—Tubular elements of cross-section which is non-circular crimped or corrugated in cross-section
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex

Definitions

  • the invention relates to a heat exchanger tube according to the preamble of claim 1.
  • tube bundle heat exchangers are also used in heating technology.
  • condensing technology is becoming increasingly important, ie the boilers use the heat of condensation contained in the water vapor by cooling the combustion gases to below the dew point.
  • the heat exchangers used on the one hand require a large heat transfer surface which is adapted to the lower temperature differences between exhaust gas and heating water, but on the other hand construction volumes and material expenditure are limited.
  • corrosion resistance and a low pressure loss when exposed to exhaust gas and condensed water must be guaranteed, which is why stainless steel is mainly used as the material.
  • the heat transfer performance depends very much on the flow conditions on the heat exchanger tubes.
  • a turbulent flow inside the pipes has proven to be favorable. This can be achieved with a corresponding amount of material by means of turbulators which are inserted into the tubes or by a special design of the tube wall.
  • the invention had for its object to provide a heat exchanger tube which can be produced cost-effectively and which achieves high heat transfer rates with a low use of material by targeted introduction of flow.
  • the heat exchanger tube has an approximately circular connection cross section at its two ends.
  • the entire intermediate middle tube part is formed by pressing from two sides as a flat channel, the cross-sectional shape of which varies or is constant over the length.
  • the central tube part essentially has an oval and rectangular cross section. So it is possible with simple forming techniques to vary this in the longitudinal direction, by the flow rate to keep the heating gases flowing inside at the same level when they cool down.
  • the flat channels prevent core flow and promote heat dissipation in the wall area. When used under high pressure loads from the outside, support points can easily be created in the center of the profile by pressing two opposite pipe walls together.
  • embossments, beads or beads which run in a spiral, cross-spiral or radial fashion are preferably provided on the central tube region.
  • the roughness of the inner and / or outer tube wall can be increased by screwed-in grooves or a coating.
  • the measures lead to the formation of a continuous, highly turbulent boundary layer without significant core flow.
  • the heat transfer properties reach qualities as in plate heat exchangers.
  • the use of pipes also offers advantages in terms of strength and low-stress connection when creating larger units. Tests have confirmed lower pressure drop on the hot gas side of these pipes than with inserted turbulators. This means that very efficient, compact and material-saving heat exchangers can be manufactured, especially for the condensing technology application.
  • the heat exchanger tube has an approximately circular connection cross section 1 at its two ends.
  • the entire intermediate tube section here is formed by pressing from two sides as a flat channel 2, the cross-sectional shape of which is constant or varies over the length. For example, the change in cross section takes place continuously as in FIG. 1 or in stages 3 as in FIG. 2.
  • oval 4 and rectangular cross sections 5 can be produced.
  • the tube walls bear high pressure loads from the outside.
  • beads 7 running in a swirl-like or cross-swirl shape are attached to the central tube area.

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  • 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)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The tube has a circular cross section (1) at its connection end, and flattened portions (2) in their middles. The cross-section of these is adapted to the volume of heating gases passing through the tubes. The middle is preferably produced by pressing the tubes from two sides, producing an oval (4) or rectangular cross-section. For high pressures, the opposite sides comes into contact at the centre. Twists or radial corrugations may also be provided.

Description

Die Erfindung bezieht sich auf ein Wärmetauscherrohr nach dem Oberbegriff des Patentanspruches 1.The invention relates to a heat exchanger tube according to the preamble of claim 1.

Mehrere solcher Rohre werden zu sogenannten Rohrbündel-Wärmetauschern zusammengefügt. Diese kommen auch in der Heizungstechnik zum Einsatz. Dort gewinnt die Brennwerttechnik zunehmend an Bedeutung, d.h. die Heizkessel nutzen die im Wasserdampf enthaltene Kondensationswärme durch Abkühlung der Verbrennungsgase bis unter den Taupunkt. Die verwendeten Wärmetauscher benötigen einerseits eine den geringeren Temperaturdifferenzen zwischen Abgas und Heizwasser angepaßte große Wärmeübertragungsfläche, andererseits sind aber Bauvolmen und Materialaufwand begrenzt. Zusätzlich muß die Korrosionsbeständigkeit sowie ein geringer Druckverlust beim Beaufschlagen mit Abgas und Kondenswasser gewährleistet sein, weshalb als Werkstoff vorwiegend Edelstahl zum Einsatz kommt.Several such tubes are combined to form so-called tube bundle heat exchangers. These are also used in heating technology. There, condensing technology is becoming increasingly important, ie the boilers use the heat of condensation contained in the water vapor by cooling the combustion gases to below the dew point. The heat exchangers used on the one hand require a large heat transfer surface which is adapted to the lower temperature differences between exhaust gas and heating water, but on the other hand construction volumes and material expenditure are limited. In addition, the corrosion resistance and a low pressure loss when exposed to exhaust gas and condensed water must be guaranteed, which is why stainless steel is mainly used as the material.

Allgemein gilt, daß die Wärmeübertragungsleistung sehr stark von den Strömungsbedingungen an den Wärmetauscherrohren abhängt. Dabei hat sich eine turbulente Strömung im Inneren der Rohre als günstig erwiesen. Diese läßt sich mit entsprechendem Materialaufwand durch Turbulatoren, welche in die Rohre eingeschoben werden oder durch eine besondere Gestaltung der Rohrwand erreichen.In general, the heat transfer performance depends very much on the flow conditions on the heat exchanger tubes. A turbulent flow inside the pipes has proven to be favorable. This can be achieved with a corresponding amount of material by means of turbulators which are inserted into the tubes or by a special design of the tube wall.

Zur Verbesserung der Wärmeübertragungsleistung kennt man beispielsweise aus dem DE-GM 74 27 097 Wärmetauscherrohre mit muldenartigen Einpressungen, die sich auf kurzen Teilstücken mit runden Rohrquerschnitten abwechseln.To improve the heat transfer performance is known for example from DE-GM 74 27 097 heat exchanger tubes with trough-like press-in, which alternate on short sections with round tube cross sections.

Der Erfindung lag die Aufgabe zugrunde, ein kostengünstig herstellbares Wärmetauscherrohr zu schaffen, welches bei geringem Materialeinsatz durch gezielte Strömungseinführung hohe Wärmeübertragungsleistungen erreicht.The invention had for its object to provide a heat exchanger tube which can be produced cost-effectively and which achieves high heat transfer rates with a low use of material by targeted introduction of flow.

Erfindungsgemäß wird dies mit den im Schutzanspruch 1 genannten Merkmalen gelöst.According to the invention this is solved with the features mentioned in claim 1.

Das Wärmetauscherrohr besitzt an seinen beiden Enden einen etwa kreisförmigen Anschlußquerschnitt. Der gesamte dazwischenliegende mittlere Rohrteil ist durch Pressen von vorzugsweise zwei Seiten als flacher Kanal ausgebildet, dessen Querschnittsform über die Länge variiert oder konstant ist. Im wesentlichen weist der mittlere Rohrteil einen ovalen und rechteckigen Querschnitt auf. So ist es mit einfachen Umformtechniken möglichen, diesen in Längsrichtung zu variieren, um die Strömungsgeschwindigkeit der innen strömenden Heizgase bei Abkühlung auf gleichem Niveau zu halten. Durch die flachen Kanäle wird eine Kernströmung vermieden und die Wärmeabgabe im Wandbereich begünstigt. Beim Einsatz unter hohen Druckbelastungen von außen lassen sich in der Profilmitte leicht Abstützpunkte durch Zusammenpressen von zwei gegenüberliegenden Rohrwänden schaffen.The heat exchanger tube has an approximately circular connection cross section at its two ends. The entire intermediate middle tube part is formed by pressing from two sides as a flat channel, the cross-sectional shape of which varies or is constant over the length. The central tube part essentially has an oval and rectangular cross section. So it is possible with simple forming techniques to vary this in the longitudinal direction, by the flow rate to keep the heating gases flowing inside at the same level when they cool down. The flat channels prevent core flow and promote heat dissipation in the wall area. When used under high pressure loads from the outside, support points can easily be created in the center of the profile by pressing two opposite pipe walls together.

Um den Wärmeübergang zu begünstigen, sind am mittleren Rohrbereich vorzugsweise drallförmig, kreuzdrallförmig oder radial verlaufende Prägungen oder Sicken angebracht. Weiterhin kann die Rauhigkeit der inneren und/oder äußeren Rohrwand durch eingedrehte Riefen oder eine Beschichtung erhöht werden. Die Maßnahmen führen zur Ausbildung einer durchgehenden hochturbulenten Grenzschicht ohne nennenswerte Kernströmung. Die Wärmeübertragungseigenschaften erreichen Qualitäten wie bei Plattenwärmetauschern. Mit der Verwendung von Rohren ergeben sich, neben der einfachen Umformung, zusätzlich Vorteile in Bezug auf Festigkeit und spannungsarme Verbindung bei der Erstellung größerer Einheiten. Versuche haben geringere heizgasseitige Druckverluste dieser Rohre als mit eingeschobenen Turbulatoren bestätigt. Somit lassen sich sehr effiziente, kompakte und materialsparende Wärmetauscher, besonders für das Anwendungsgebiet Brennwerttechnik, herstellen.In order to favor the heat transfer, embossments, beads or beads which run in a spiral, cross-spiral or radial fashion are preferably provided on the central tube region. Furthermore, the roughness of the inner and / or outer tube wall can be increased by screwed-in grooves or a coating. The measures lead to the formation of a continuous, highly turbulent boundary layer without significant core flow. The heat transfer properties reach qualities as in plate heat exchangers. In addition to simple forming, the use of pipes also offers advantages in terms of strength and low-stress connection when creating larger units. Tests have confirmed lower pressure drop on the hot gas side of these pipes than with inserted turbulators. This means that very efficient, compact and material-saving heat exchangers can be manufactured, especially for the condensing technology application.

Die Zeichnung stellt Ausführungsbeispiele der Erfindung dar. Es zeigt:

Fig. 1:
Ein Wärmetauscherrohr mit gleichmäßiger Veränderung des Querschnitts.
Fig. 2:
Ein Wärmetauscherrohr mit stufenweiser Veränderung des Querschnitts.
Fig. 3:
Einen Schnitt durch ein Rohr mit ovalem Querschnitt.
Fig. 4:
Einen Schnitt durch ein Rohr mit rechteckigem Querschnitt.
Fig. 5:
Einen Schnitt durch ein Rohr mit Abstützpunkten für hohe Druckbeständigkeit.
Fig. 6:
Ein Wärmetauscherrohr mit kreuzdrallförmig eingebrachten Sicken.
Fig. 7:
Einen Schnitt durch ein Rohr mit drallförmig eingebrachten Sicken.
The drawing shows exemplary embodiments of the invention. It shows:
Fig. 1:
A heat exchanger tube with an even change in cross-section.
Fig. 2:
A heat exchanger tube with gradual change in cross section.
Fig. 3:
A section through a tube with an oval cross-section.
Fig. 4:
A section through a tube with a rectangular cross-section.
Fig. 5:
A cut through a pipe with support points for high pressure resistance.
Fig. 6:
A heat exchanger tube with cross-helical beads.
Fig. 7:
A cut through a tube with swirl-like beads.

Das Wärmetauscherrohr besitzt an seinen beiden Enden einen etwa kreisförmigen Anschlußquerschnitt 1. Der gesamte dazwischenliegende mittlere Rohrteil ist hier durch Pressen von zwei Seiten als flacher Kanal 2 ausgebildet, dessen Querschnittsform über die Länge konstant ist oder variiert. Beispielsweise erfolgt die Querschnittsänderung kontinuierlich wie in Fig. 1 oder in Stufen 3 wie in Fig. 2. Es lassen sich im wesentlichen ovale 4 sowie rechteckförmige Querschnitte 5 herstellen. An eingeprägten Abstützpunkten 6 tragen die Rohrwände hohe Druckbelastungen von außen ab. Um den Wärmeübergang zu begünstigen, sind am mittleren Rohrbereich drallförmig oder kreuzdrallförmig verlaufende Sicken 7 angebracht.The heat exchanger tube has an approximately circular connection cross section 1 at its two ends. The entire intermediate tube section here is formed by pressing from two sides as a flat channel 2, the cross-sectional shape of which is constant or varies over the length. For example, the change in cross section takes place continuously as in FIG. 1 or in stages 3 as in FIG. 2. Essentially oval 4 and rectangular cross sections 5 can be produced. At stamped support points 6, the tube walls bear high pressure loads from the outside. In order to favor the heat transfer, beads 7 running in a swirl-like or cross-swirl shape are attached to the central tube area.

Claims (5)

Wärmetauscherrohr, insbesondere für Rohrbündel-Wärmetauscher von Brennwertheizkesseln, mit etwa kreisförmigen Anschlußquerschnitten und mit Einprägungen zur Verbesserung des Wärmeübergangs, dadurch gekennzeichnet, daß der zwischen den Anschlußquerschnitten (1) liegende mittlere Rohrteil als flacher Kanal (2) gestaltet ist, dessen Querschnitt an das Volumen der innen durchströmenden Heizgase angepaßt ist.Heat exchanger tube, in particular for shell-and-tube heat exchangers of condensing boilers, with approximately circular connection cross-sections and with impressions for improving the heat transfer, characterized in that the middle tube part lying between the connection cross-sections (1) is designed as a flat channel (2), the cross-section of which corresponds to the volume the heating gases flowing through the inside is adapted. Wärmetauscherrohr nach Anspruch 1,
dadurch gekennzeichnet, daß der zwischen den Anschlußquerschnitten (1) liegende mittlere Rohrteil durch vorzugsweise zweiseitiges Pressen umgeformt ist.Heat exchanger tube according to claim 1,
characterized in that the central tube part lying between the connection cross sections (1) is formed by preferably two-sided pressing. Wärmetauscherrohr nach den Ansprüchen 1 und 2,
dadurch gekennzeichnet, daß der mittlere Rohrteil einen im wesentlichen ovalen (4) oder rechteckförmigen (5) Querschnitt aufweist oder in einer Hochdruckausführung an einigen Punkten (6) in der Mitte des Querschnitts bis zum Berühren von zwei gegenüberliegenden Rohrwänden zusammengepreßt ist.Heat exchanger tube according to claims 1 and 2,
characterized in that the central tube part has a substantially oval (4) or rectangular (5) cross-section or is compressed in a high pressure version at some points (6) in the middle of the cross-section until two opposite tube walls come into contact. Wärmetauscherrohr nach den Ansprüchen 1 bis 3,
dadurch gekennzeichnet, daß zusätzlich zum Beispiel drallförmig, kreuzdrallförmig oder radial verlaufende Prägungen oder Sicken (7) am mittleren Rohrteil aufgebracht sind.Heat exchanger tube according to claims 1 to 3,
characterized in that, in addition, for example, helical, cross-helical or radial embossments or beads (7) are applied to the central tube part. Wärmetauscherrohr nach den Ansprüchen 1 bis 4,
dadurch gekennzeichnet, daß innen und/oder außen die Rauhigkeit der Rohrwand mit eingedrehten Riefen oder einer aufgebrachten Beschichtung erhöht wird.Heat exchanger tube according to claims 1 to 4,
characterized in that the roughness of the tube wall is increased with turned grooves or an applied coating on the inside and / or outside.
EP19960114202 1995-11-02 1996-09-05 Heat exchanger tube Withdrawn EP0772017A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29517325U 1995-11-02
DE29517325U DE29517325U1 (en) 1995-11-02 1995-11-02 Heat exchanger tube

Publications (2)

Publication Number Publication Date
EP0772017A2 true EP0772017A2 (en) 1997-05-07
EP0772017A3 EP0772017A3 (en) 1998-07-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960114202 Withdrawn EP0772017A3 (en) 1995-11-02 1996-09-05 Heat exchanger tube

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EP (1) EP0772017A3 (en)
DE (1) DE29517325U1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19725454A1 (en) * 1997-06-16 1999-01-21 Georg Wall Sheet-pile with outside hook strips for sheet-pile walling
EP1221579A1 (en) 2001-01-05 2002-07-10 hde Metallwerk GmbH Heat exchanger tube for liquid and gaseous media
WO2005014667A1 (en) * 2003-07-24 2005-02-17 Bayer Technology Services Gmbh Method and device for the elimination of volatile substances from high-viscous media
US7575623B2 (en) 2003-07-07 2009-08-18 Bayer Technology Services Gmbh Method for leaching aluminium-metal alloys
GB2509762A (en) * 2013-01-14 2014-07-16 Halla Visteon Climate Control Tube for a heat exchanger

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29709136U1 (en) * 1997-05-24 1997-07-24 Viessmann Werke Gmbh & Co, 35108 Allendorf Heat exchanger tube
DE19731190A1 (en) * 1997-07-21 1999-01-28 Buderus Heiztechnik Gmbh Heat exchanger pipe for hot gases in boiler
FR2793313B1 (en) * 1999-05-04 2001-08-03 Guillot Ind Sa HEAT EXCHANGER FOR EQUIPPING A HOT WATER BOILER
DE102004020346B4 (en) * 2004-04-27 2009-06-10 Robert Bosch Gmbh Condensing boiler
DE102009013269A1 (en) * 2009-03-05 2010-09-09 E.G.O. Elektro-Gerätebau GmbH Flow heater and method of making a flow heater
ES2769277T3 (en) * 2016-07-26 2020-06-25 S A R I Stampi Articoli Ind Di Zen Bortolo Tubular device for the transit of a heat exchange fluid, particularly for heat exchangers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7427097U (en) 1976-06-10 R. & G. Schmoele Metallwerke, 5750 Menden Tube for heat exchanger for liquid media

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US4216819A (en) * 1976-09-09 1980-08-12 Union Carbide Corporation Enhanced condensation heat transfer device and method
JPS59501171A (en) * 1982-06-29 1984-07-05 アラーズ　ヴェルクステッダー　アーベー tube heat exchanger
SE456935B (en) * 1984-05-24 1988-11-14 Armaturjonsson Ab HEAT EXCHANGER THERE FLOWING PLATES WITH STRILHAIR ARE PLACED IN EACH SLING OF A SERPENT INFORMATION PIPE AND SUITABLE FOR PREPARATION
AT400365B (en) * 1993-10-15 1995-12-27 Fercher Josef Heat exchanger
DE4343405A1 (en) * 1993-12-18 1995-06-22 Friedrich Ambs Gmbh & Co Kg Ap Heat exchange tube for tube cluster heat exchanger

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7427097U (en) 1976-06-10 R. & G. Schmoele Metallwerke, 5750 Menden Tube for heat exchanger for liquid media

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19725454A1 (en) * 1997-06-16 1999-01-21 Georg Wall Sheet-pile with outside hook strips for sheet-pile walling
DE19725454C2 (en) * 1997-06-16 1999-05-20 Georg Wall Sheet pile
EP1221579A1 (en) 2001-01-05 2002-07-10 hde Metallwerk GmbH Heat exchanger tube for liquid and gaseous media
DE10100241A1 (en) * 2001-01-05 2002-07-18 Hde Metallwerk Gmbh Heat exchanger tube for liquid or gaseous media
US7575623B2 (en) 2003-07-07 2009-08-18 Bayer Technology Services Gmbh Method for leaching aluminium-metal alloys
WO2005014667A1 (en) * 2003-07-24 2005-02-17 Bayer Technology Services Gmbh Method and device for the elimination of volatile substances from high-viscous media
CN100467495C (en) * 2003-07-24 2009-03-11 拜尔技术服务有限责任公司 Method and apparatus for removing volatile substances from highly viscous media
US8074371B2 (en) 2003-07-24 2011-12-13 Bayer Technology Services Gmbh Process and apparatus for removing volatile substances from highly viscous media
GB2509762A (en) * 2013-01-14 2014-07-16 Halla Visteon Climate Control Tube for a heat exchanger
GB2509762B (en) * 2013-01-14 2015-02-04 Halla Visteon Climate Control Tube for Heat Exchanger
US10113811B2 (en) 2013-01-14 2018-10-30 Hanon Systems Tube for heat exchanger

Also Published As

Publication number Publication date
DE29517325U1 (en) 1996-02-01
EP0772017A3 (en) 1998-07-29

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