EP0062691A1 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
EP0062691A1
EP0062691A1 EP81102912A EP81102912A EP0062691A1 EP 0062691 A1 EP0062691 A1 EP 0062691A1 EP 81102912 A EP81102912 A EP 81102912A EP 81102912 A EP81102912 A EP 81102912A EP 0062691 A1 EP0062691 A1 EP 0062691A1
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EP
European Patent Office
Prior art keywords
heat exchanger
tube
inner tube
exchanger according
coil
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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.)
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EP81102912A
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German (de)
French (fr)
Inventor
Ingo Dipl.-Ing. Dr. Mont. Bleckmann
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ELPAG AG CHUR
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ELPAG AG CHUR
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Application filed by ELPAG AG CHUR filed Critical ELPAG AG CHUR
Priority to EP81102912A priority Critical patent/EP0062691A1/en
Publication of EP0062691A1 publication Critical patent/EP0062691A1/en
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    • 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
    • F28D7/026—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 and formed by bent members, e.g. plates, the coils having a cylindrical configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/14—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically both tubes being bent

Definitions

  • the invention relates to a heat exchanger with at least one tube element through which a heat exchange medium flows and with means for swirling the media flow.
  • Tubular heat exchangers are known for example from DE-OS 30 08 930 and 30 18 978.
  • a tube element has in its interior and over its entire longitudinal extent a partition wall which has a multiplicity of ribs which alternately protrude from the partition wall in opposite directions and bear elastically on the inner wall of the tube.
  • a helical, continuously running strip is accommodated in the tube.
  • the present invention is based on the object of significantly improving the known elements in the characteristics mentioned. In contrast to the known solutions, however, it should also be possible to circulate a plurality of heat exchange media or a plurality of branches of a heat exchange medium in countercurrent through the heat exchanger.
  • Subclaims 2 to 6 relate to preferred embodiments.
  • the sub-claims 7 and 8 relate to preferred applications of the heat exchanger.
  • An inner tube 1 for example made of chromium-nickel steel, carries a wire helix 2 which is loosely wound onto the tube 1 under pretension.
  • the ends of the wire coil 1 can be fixed by spot welding or soldering.
  • the tube 1 with the wire helix 2 is inserted into an outer tube 3.
  • the inner diameter of the outer tube 3 corresponds approximately to the sum of the outer diameter of the inner tube 1 plus the diameter of the wire helix 2.
  • a first media stream 4 is now passed through the annular space between the outer jacket of the inner tube 1 and the inner jacket of the outer tube 3, which is forced into a helical course under the action of the wire coil 2. Since the media flow 4 has to travel a much greater distance than would be the case without the action of the wire helix 2, that is to say the case with a straight line, the heat exchange per unit length of the tube 3 is increased many times over. In addition, the media flow is pressed against the inner jacket of the outer tube 3 under the action of the centrifugal force. In addition, there is a corresponding turbulence.
  • a further media stream 6 can be passed through the inner tube 1.
  • the heat exchanger can now be optimized for any heat exchange problem without changing the manufacturing device, in particular adapted to a predetermined flow resistance.
  • the flow resistance can be increased or decreased within wide limits.
  • FIG. 3 shows that one or more further spiral tubes 7 can be inserted into the inner tube 1. Further media flows can be conducted through the further annular spaces 8 and 9 formed in this way.
  • Fig. 4 shows that a tubular heater 10 can also serve as the inner core of the heat exchanger.
  • the heat exchanger can then serve two different media, e.g. B. air and water to heat.
  • a simple box-like structure 11 can be used to introduce or discharge the media streams.
  • the inner tube 6 is sealed through the box-like structure 11.
  • the media stream 4 which is passed helically through the annular space between the outer jacket of the tube 1 and the inner jacket of the outer tube 3, can be sucked off, for example, through a connecting piece 12 on the box-like structure.
  • a preferred area of application for the heat exchanger is in household clothes dryers.
  • the heated and moist exhaust air is e.g. passed through the annular space between the outer jacket of the inner tube 1 and the inner jacket of the outer tube 3, while the fresh air drawn in flows through the inner tube 1. In this way, the fresh air is preheated.
  • the helix 2 supports the condensation of the water vapor carried along.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

Tubular heat exchanger consisting of an inner tube (1), a helically-wound wire (2) arranged on the latter and an outer tube (3). The heat exchanging medium flows through the annular space between the inner tube (1) and outer tube (3) with a helical flow characteristic (4). A further heat exchanging medium (6) can be routed through the inner tube. <IMAGE>

Description

Die Erfindung betrifft einen Wärmeaustauscher mit mindestens einem von einem Wärmeaustauschmedium durchströmten Rohrelement und mit Mitteln zur Verwirbelung des Medienstroms.The invention relates to a heat exchanger with at least one tube element through which a heat exchange medium flows and with means for swirling the media flow.

Rohrförmige Wärmeaustauscher sind beispielsweise aus der DE-OS 30 08 930 und 30 18 978 bekannt. Gemäß der zuerst genannten Anmeldung besitzt ein Rohrelement in seinem Inneren und über seine gesamte Längserstreckung eine Trennwand, die eine Vielzahl von Rippen aufweist, die von der Trennwand wechselweise in entgegengesetzten Richtungen hervorragen und elastisch an der Innenwand des Rohres anliegen.Tubular heat exchangers are known for example from DE-OS 30 08 930 and 30 18 978. According to the first-mentioned application, a tube element has in its interior and over its entire longitudinal extent a partition wall which has a multiplicity of ribs which alternately protrude from the partition wall in opposite directions and bear elastically on the inner wall of the tube.

Gemäß der an zweiter Stelle genannten Anmeldung ist in dem Rohr eine schraubenförmige, kontinuierlich verlaufende Leiste untergebracht.According to the application mentioned in the second place, a helical, continuously running strip is accommodated in the tube.

Bei den bekannten Lösungen werden hohe Wärmeaustauschleistungen bei geringen Kosten angestrebt. Das zirkulierende Medium soll auf eine große spezifische Wärmeaustauschfläche auftreffen.In the known solutions, high heat exchange rates are sought at low costs. The circulating medium should hit a large specific heat exchange surface.

Der vorliegenden Erfindung liegt nun die Aufgabe zugrunde, die bekannten Elemente in den genannten Charakteristiken wesentlich zu verbessern. Im Gegensatz zu den bekannten Lösungen soll es jedoch auch möglich sein, mehrere Wärmeaustauschmedien oder mehrere Zweige eines Wärmeaustauschmediums im Gegenstrom durch den Wärmeaustauscher zirkulieren zu lassen.The present invention is based on the object of significantly improving the known elements in the characteristics mentioned. In contrast to the known solutions, however, it should also be possible to circulate a plurality of heat exchange media or a plurality of branches of a heat exchange medium in countercurrent through the heat exchanger.

Hinsichtlich der Lösung der genannten Aufgabe wird auf die kennzeichnenden Merkmale des Hauptanspruches Bezug genommen. Die Unteransprüche 2 bis 6 betreffen bevorzugte Ausführungsformen. Die Unteransprüche 7 und 8 betreffen bevorzugte Anwendungsmöglichkeiten des Wärmeaustauschers.With regard to the solution of the stated object, reference is made to the characterizing features of the main claim. Subclaims 2 to 6 relate to preferred embodiments. The sub-claims 7 and 8 relate to preferred applications of the heat exchanger.

Die gemäß der Erfindung vorgeschlagene Lösung besitzt gegenüber den bekannten Vorrichtungen eine Reihe von wesentlichen Vorteilen:

  • a) Ein Rohr mit aufgewickelter Drahtwendel ist wesentlich billiger herzustellen als Trennwände mit einer Vielzahl von Rippen, die wechselweise in entgegengesetzten Richtungen abstehen oder als eine schraubenförmige kontinuierlich verlaufende durchgehende Leiste.
  • b) Die Materialkosten für die gemäß der Erfindung vorgeschlagene Lösung sind im Vergleich zu bekannten Lösungen geringer. Dies spielt eine besondere Rolle, wenn korrosionsbeständige Materialien, z. B. Chromnickelstähle, eingesetzt werden müssen.
  • c) Die gemäß der Erfindung vorgeschlagene Lösung läßt sich herstellungstechnisch ohne Schwierigkeiten auf die verschiedenen Aufgabenstellungen umstellen, und zwar durch entsprechende Wahl der Rohrdurchmesser bzw. der Durchmesser der Drahtwendeln.
  • d) Es können beliebig viele Medienströme in Wärmeaustausch zueinander gesetzt werden.
  • e) Es besteht die Möglichkeit, den Wärmeaustauschmedienstrom umzulenken, d.h. wenn beispielsweise nur eine einseitige Anschlußmöglichkeit besteht, kann am Ende einer relativ langen Rohrleitung der durch den Ringraum zwischen dem Innenrohr und dem Außenrohr fließende Medienstrom in das Innenrohr umgelenkt werden. Es besteht auf diese Weise auch die Möglichkeit, die Wärmeaufnahme bzw. Wärmeabgabe zum oder von dem Medienstrom stufenförmig zu gestalten.
The solution proposed according to the invention has a number of essential advantages over the known devices:
  • a) A tube with a coiled wire coil is much cheaper to produce than partitions with a plurality of ribs which alternately protrude in opposite directions or as a helical continuous strip.
  • b) The material costs for the solution proposed according to the invention are lower compared to known solutions. This plays a special role when corrosion-resistant materials, e.g. B. chrome nickel steels must be used.
  • c) The solution proposed according to the invention can be converted to the various tasks in terms of production technology without difficulty, specifically by appropriate selection of the tube diameter or the diameter of the wire helices.
  • d) Any number of media flows can be placed in heat exchange with each other.
  • e) It is possible to divert the heat exchange medium flow, ie if, for example, only one-sided connection is possible Lich exists, at the end of a relatively long pipeline, the media stream flowing through the annular space between the inner tube and the outer tube can be deflected into the inner tube. In this way, there is also the possibility of designing the heat absorption or heat emission to or from the media flow in a step-like manner.

Die beiliegenden Zeichnungen dienen zusammen mit der folgenden speziellen Beschreibung der weiteren Erläuterung der Erfindung.The accompanying drawings, together with the following specific description, serve to further explain the invention.

Auf den Zeichnungen zeigen:

  • Fig. 1 eine schaubildliche Ansicht einer bevorzugten Ausführungsform eines Wärmetauschers;
  • Fig. 2 in vergrößertem Maßstab einen Schnitt längs der Linie II-II in Fig. 1;
  • Fig. 3 einen Schnitt einer Ausführungsform für mehrere Wärmeaustaus chmedien; ,
  • Fig. 4 einen Schnitt einer Ausführungsform mit Rohrheizkörper.
The drawings show:
  • Figure 1 is a perspective view of a preferred embodiment of a heat exchanger.
  • Figure 2 is an enlarged section along the line II-II in Fig. 1.
  • 3 shows a section of an embodiment for several heat exchange media; ,
  • Fig. 4 shows a section of an embodiment with tubular heater.

Ein Innenrohr 1, z.B. aus Chromnickelstahl, trägt eine Drahwendel 2, die lose unter Vorspannung auf das Rohr 1 aufgewickelt ist. Die Enden der Drahtwendel 1 können durch Punktschweißen oder Löten fixiert sein. Das Rohr 1 mit der Drahtwendel 2 ist in ein Außenrohr 3 eingeschoben. Der Innendurchmesser des Außenrohres 3 entspricht in etwa der Summe Außendurchmesser des Innenrohres 1 plus Durchmesser der Drahtwendel 2. Nach dem Einschieben des Innenrohres 1 mit der Drahtwendel 2 in das Außenrohr 3 kann die Anordnung, wie in Fig. 1 dargestellt, z. B. in Hufeisenform gebogen werden. Durch den Ringraum zwischen dem Außenmantel des Innenrohres 1 und dem Innenmantel des Außenrohres 3 wird nun ein erster Medienstrom 4 geleitet, welcher unter der Wirkung der Drahtwendel 2 zu einem schraubenförmigen Verlauf gezwungen wird. Da der Medienstrom 4 eine wesentlich größere Wegstrecke zurücklegen muß als dies ohne die Wirkung der Drahtwendel 2, also bei geradlinigem Verlauf der Fall wäre, vergrößert sich der Wärmeaustausch je Längeneinheit des Rohres 3 um ein Vielfaches. Hierzu kommt, daß unter der Wirkung der Zentrifugalkraft der Medienstrom an den Innenmantel des Außenrohres 3 angepreßt wird. Darüber hinaus ergibt sich eine entsprechende Verwirbelung.An inner tube 1, for example made of chromium-nickel steel, carries a wire helix 2 which is loosely wound onto the tube 1 under pretension. The ends of the wire coil 1 can be fixed by spot welding or soldering. The tube 1 with the wire helix 2 is inserted into an outer tube 3. The inner diameter of the outer tube 3 corresponds approximately to the sum of the outer diameter of the inner tube 1 plus the diameter of the wire helix 2. After inserting the inner tube 1 with the wire Helix 2 in the outer tube 3, the arrangement, as shown in Fig. 1, z. B. bent in a horseshoe shape. A first media stream 4 is now passed through the annular space between the outer jacket of the inner tube 1 and the inner jacket of the outer tube 3, which is forced into a helical course under the action of the wire coil 2. Since the media flow 4 has to travel a much greater distance than would be the case without the action of the wire helix 2, that is to say the case with a straight line, the heat exchange per unit length of the tube 3 is increased many times over. In addition, the media flow is pressed against the inner jacket of the outer tube 3 under the action of the centrifugal force. In addition, there is a corresponding turbulence.

Durch das Innenrohr 1 kann ein weiterer Medienstrom 6 geleitet werden.A further media stream 6 can be passed through the inner tube 1.

Der Wärmeaustauscher kann nun ohne Änderung der Herstellungsvorrichtung auf jedes beliebige Wärmeaustauschproblem optimiert werden, insbesondere einem vorgegebenen Strömungswiderstand angepaßt werden. Bereits durch Änderung des Durchmessers der Drahtwendel 2 und gegebenenfalls der Steigung derselben läßt sich der Strömungswiderstand in weiten Grenzen vergrößern oder verkleinern.The heat exchanger can now be optimized for any heat exchange problem without changing the manufacturing device, in particular adapted to a predetermined flow resistance. Already by changing the diameter of the wire coil 2 and, if necessary, the pitch thereof, the flow resistance can be increased or decreased within wide limits.

Die in Fig. 3 dargestellte Ausführungsform zeigt, daß in das Innenrohr 1 ein oder mehrere weitere Wendelrohre 7 eingeschoben werden können. Durch die so gebildeten weiteren Ringräume 8 und 9 können weitere Medienströme geleitet werden.The embodiment shown in Fig. 3 shows that one or more further spiral tubes 7 can be inserted into the inner tube 1. Further media flows can be conducted through the further annular spaces 8 and 9 formed in this way.

Fig. 4 zeigt, daß als innerer Kern des Wärmeaustauschers auch ein Rohrheizkörper 10 dienen kann. Der Wärmeaustauscher kann dann dazu dienen, zwei verschiedene Medien, z. B. Luft und Wasser, zu erhitzen. Zur Einleitungoder Ableitung der Medienströme kann, wie in Fig. 2 dargestellt, ein einfaches kastenartiges Gebilde 11 dienen. Das Innenrohr 6 ist abgedichtet durch das kastenartige Gebilde 11 hindurchgeführt. Der durch den Ringraum zwischen dem Außenmantel des Rohres 1 und dem Innenmantel des Außenrohres 3 schraubenförmig hindurchgeleitete Medienstrom 4 kann beispielsweise durch einen Anschlußstutzen 12 an dem kastenartigen Gebilde abgesaugt werden.Fig. 4 shows that a tubular heater 10 can also serve as the inner core of the heat exchanger. The heat exchanger can then serve two different media, e.g. B. air and water to heat. As shown in FIG. 2, a simple box-like structure 11 can be used to introduce or discharge the media streams. The inner tube 6 is sealed through the box-like structure 11. The media stream 4, which is passed helically through the annular space between the outer jacket of the tube 1 and the inner jacket of the outer tube 3, can be sucked off, for example, through a connecting piece 12 on the box-like structure.

Ein bevorzugtes Anwendungsgebiet des Wärmeaustauschers sind Haushaltswäschetrockner. Die erhitzte und feuchte Abluft wird z.B. durch den Ringraum zwischen dem Außenmantel des Innenrohres 1 und dem Innenmantel des Außenrohres 3 geleitet, während die angesaugte Frischluft durch das Innenrohr 1 strömt. Auf diese Weise wird die Frischluft vorgewärmt. Gleichzeitig unterstützt die Wendel 2 das Auskondensieren des mitgeführten Wasserdampfes.A preferred area of application for the heat exchanger is in household clothes dryers. The heated and moist exhaust air is e.g. passed through the annular space between the outer jacket of the inner tube 1 and the inner jacket of the outer tube 3, while the fresh air drawn in flows through the inner tube 1. In this way, the fresh air is preheated. At the same time, the helix 2 supports the condensation of the water vapor carried along.

Weitere bevorzugte Anwendungsgebiete sind Wärmetauscher für Wärmepumpensysteme.Other preferred areas of application are heat exchangers for heat pump systems.

Claims (8)

1. Wärmeaustauscher mit mindestens einem von einem Wärmeaustauschmedium durchströmten Rohrelement und mit Mitteln zur Verwirbelung des Medienstromes, dadurch gekennzeichnet, daß ein Innenrohr (1) vorgesehen ist, auf welches mindestens eine Wendel (2) aus Draht oder einem ähnlichen streifenförmigen Material gewickelt ist und daß das Innenrohr (1) mit der Wendel (2) in einem Außenrohr (3) untergebracht ist, ferner, daß ein erster Medienstrom (4) durch den Ringraum zwischen dem Innenrohr (1) und dem Außenrohr (3) unter entsprechender drehender Verwirbelung aufgrund der Wirkung der Wendel (2) geleitet wird, und daß bei Bedarf ein zweiter Medienstrom (6) oder der erste Medienstrom (4) in Gegenströmung durch das Innenrohr (1) geleitet wird.1. Heat exchanger with at least one tubular element through which a heat exchange medium flows and with means for swirling the media flow, characterized in that an inner tube (1) is provided, on which at least one coil (2) of wire or a similar strip-shaped material is wound and that the inner tube (1) with the helix (2) is housed in an outer tube (3), further that a first media flow (4) through the annular space between the inner tube (1) and the outer tube (3) with a corresponding rotating vortex due to Effect of the coil (2) is passed, and that if necessary, a second media stream (6) or the first media stream (4) is passed in counterflow through the inner tube (1). 2. Wärmeaustauscher nach Anspruch 1, dadurch gekennzeichnet, daß in dem Innenrohr (1) ein oder mehrere weitere Wendelrohre (7) angeordnet sind, wobei die so gebildeten weiteren Ringräume (8,9) weitere Medienströme oder umgelenkte Äste des Hauptmediumstromes aufnehmen.2. Heat exchanger according to claim 1, characterized in that one or more further helical tubes (7) are arranged in the inner tube (1), the further annular spaces (8, 9) thus formed receiving further media streams or deflected branches of the main medium stream. 3. Wärmeaustauscher nach Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß die Drahtwendel (2) auf das zugeordnete Rohr unter entsprechender Vorspannung aufgewickelt ist und daß lediglich die Enden der Drahtwendel (2) auf dem Rohrmantel fixiert sind.3. Heat exchanger according to claims 1 or 2, characterized in that the wire coil (2) is wound on the associated tube under appropriate pretension and that only the ends of the wire coil (2) are fixed on the tube jacket. 4. Wärmeaustauscher nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Rohre und/oder die Drahtwendeln aus einem Chromnickelstahl bestehen.4. Heat exchanger according to one of claims 1 to 3, characterized in that the tubes and / or the wire helices consist of a chromium-nickel steel. 5. Wärmeaustauscher nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß anstelle des innersten Innenrohres ein elektrischer Rohrheizkörper (10) vorgesehen ist.5. Heat exchanger according to one of claims 1 to 4, characterized in that an electric tubular heater (10) is provided instead of the innermost inner tube. 6. Wärmeaustauscher nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Wendel (2) an dem Innenmantel des Außenrohres (3) anliegt.6. Heat exchanger according to one of claims 1 to 5, characterized in that the coil (2) abuts the inner jacket of the outer tube (3). 7. Verwendung des Wärmeaustauschers nach Ansprüchen 1 bis 6 für Haushaltswäschetrockner.7. Use of the heat exchanger according to claims 1 to 6 for household clothes dryers. 8. Verwendung des Wärmeaustauschers nach Ansprüchen 1 bis 6 für Solarenergie- oder Verdampferanlagen.8. Use of the heat exchanger according to claims 1 to 6 for solar energy or evaporator systems.
EP81102912A 1981-04-15 1981-04-15 Heat exchanger Withdrawn EP0062691A1 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119606A2 (en) * 1983-03-17 1984-09-26 Hans Dr. Viessmann Heat exchanger
EP0449124A1 (en) * 1990-03-29 1991-10-02 Hubert Vogt Annular space heat exchanger
EP0942250A1 (en) * 1998-03-09 1999-09-15 Romabau AG Cryogenic heat exchanger
JP2009264674A (en) * 2008-04-25 2009-11-12 Usui Kokusai Sangyo Kaisha Ltd Double-pipe bending method, double-pipe bent using the method, and double-pipe heat exchanger using the double pipe
CN104964584A (en) * 2015-06-10 2015-10-07 无锡博伊特科技股份有限公司 Double-pipe heat exchanger
CN105043140A (en) * 2015-08-06 2015-11-11 江门市顺恩牛奶有限公司 Liquid spiral type sleeve heat exchange device
CN113730941A (en) * 2021-07-27 2021-12-03 山东亿维新材料有限责任公司 Sorting and collecting device for fuel oil production

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Publication number Priority date Publication date Assignee Title
DE251583C (en) *
US1423695A (en) * 1919-10-09 1922-07-25 Nitrogen Corp Heat exchanger or condenser
DE415695C (en) * 1925-01-14 1925-06-30 Paul Knuer Heat exchange double pipe
US3651551A (en) * 1970-02-26 1972-03-28 Robert B Cannon Header structure for heat transfer apparatus
CH535929A (en) * 1972-07-25 1973-04-15 Begert Alois Coaxial pipe heat exchanger - with helical guide for one fluid
GB1338495A (en) * 1971-11-05 1973-11-21 Luft U Kaeltetechnik Veb K Tubular heat exchangers
DE2441076A1 (en) * 1973-09-03 1975-03-27 Schuurink Fredrik Adolf Drainage of condensed water from laundry-dryer - with water-jet vacuum-pump in drainage-pipe, connected to suction-pipe
US3898428A (en) * 1974-03-07 1975-08-05 Universal Oil Prod Co Electric in line water heating apparatus
GB1488812A (en) * 1974-09-23 1977-10-12 Vincze Sa Solar heating apparatus
DE2731027B1 (en) * 1977-07-08 1978-11-09 Elpag Ag Chur Process for the production of thin-walled metal pipes
DE2914859A1 (en) * 1979-04-12 1980-10-30 Bauknecht Gmbh G LAUNDRY DRYER

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE251583C (en) *
US1423695A (en) * 1919-10-09 1922-07-25 Nitrogen Corp Heat exchanger or condenser
DE415695C (en) * 1925-01-14 1925-06-30 Paul Knuer Heat exchange double pipe
US3651551A (en) * 1970-02-26 1972-03-28 Robert B Cannon Header structure for heat transfer apparatus
GB1338495A (en) * 1971-11-05 1973-11-21 Luft U Kaeltetechnik Veb K Tubular heat exchangers
CH535929A (en) * 1972-07-25 1973-04-15 Begert Alois Coaxial pipe heat exchanger - with helical guide for one fluid
DE2441076A1 (en) * 1973-09-03 1975-03-27 Schuurink Fredrik Adolf Drainage of condensed water from laundry-dryer - with water-jet vacuum-pump in drainage-pipe, connected to suction-pipe
US3898428A (en) * 1974-03-07 1975-08-05 Universal Oil Prod Co Electric in line water heating apparatus
GB1488812A (en) * 1974-09-23 1977-10-12 Vincze Sa Solar heating apparatus
DE2731027B1 (en) * 1977-07-08 1978-11-09 Elpag Ag Chur Process for the production of thin-walled metal pipes
DE2914859A1 (en) * 1979-04-12 1980-10-30 Bauknecht Gmbh G LAUNDRY DRYER
FR2453930A1 (en) * 1979-04-12 1980-11-07 Bauknecht Gmbh G Clothes tumble drier - has an additional heat exchanger to reduce energy consumption

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119606A2 (en) * 1983-03-17 1984-09-26 Hans Dr. Viessmann Heat exchanger
EP0119606A3 (en) * 1983-03-17 1985-03-13 Hans Dr. Viessmann Heat exchanger
EP0449124A1 (en) * 1990-03-29 1991-10-02 Hubert Vogt Annular space heat exchanger
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