EP2045556B1 - Plate heat exchanger - Google Patents

Plate heat exchanger Download PDF

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Publication number
EP2045556B1
EP2045556B1 EP08164770A EP08164770A EP2045556B1 EP 2045556 B1 EP2045556 B1 EP 2045556B1 EP 08164770 A EP08164770 A EP 08164770A EP 08164770 A EP08164770 A EP 08164770A EP 2045556 B1 EP2045556 B1 EP 2045556B1
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Prior art keywords
row
depressions
heat exchanger
elevations
plate heat
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German (de)
French (fr)
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EP2045556A2 (en
EP2045556A3 (en
Inventor
Klaus Otahal
Josef Hofer
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Mahle International GmbH
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Mahle International GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
    • F28F3/027Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements with openings, e.g. louvered corrugated fins; Assemblies of corrugated strips
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00Making other particular articles
    • B21D53/02Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • 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
    • F28F13/12Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/4935Heat exchanger or boiler making

Definitions

  • the invention relates to a plate heat exchanger according to the preamble of claim 1.
  • a heat exchanger is off EP-A-1 172 625 known.
  • Plate heat exchangers in particular oil / water heat exchangers, consist of a plurality of plates stacked one above the other, each of which alternately forms layers through which a first and a second medium, for example oil and water, flow.
  • the erected edge of the plates encloses each heat exchanger layer and extends beyond the edge of the subsequent plate, so that in the manufacturing process, a dense solder joint can set to the outside.
  • the flow of the plates via openings in the corners of the predominantly rectangular running plates.
  • the heat exchange units of heat exchangers with internal turbulizers to improve the heat exchanger characteristics of the heat exchanger.
  • the turbulators cause the medium, which flows through the heat exchanger unit, to flow in a turbulent manner, thereby improving the heat exchange characteristics of the heat exchanger.
  • a plate heat exchanger with a plurality of parallel partitions is known, wherein the partitions alternately spanning a flow space for a first medium and a second medium.
  • a turbulence generator is arranged, which consists of a structured sheet metal plate having juxtaposed rows with alternating elevations and depressions. Adjacent rows are offset from one another so that the medium can flow through between the rows.
  • the elevations and depressions are connected to each other via mutually inclined webs, wherein between the webs of the turbulence generator has a substantially trapezoidal cross-section.
  • the DE 298 24 920 U1 discloses a heat exchanger for heat exchange between gaseous media, consisting of superimposed profile elements, wherein the stacked profile elements alternately form an angle with the longitudinal direction of the heat exchanger and these profile elements have smooth surfaces and are not provided with additional structures.
  • the profile elements may have a sawtooth-like shape or a trapezoidal, pleated or wavy profile. With such profile elements, however, no optimal heat dissipation is guaranteed.
  • the object of the invention is to avoid these disadvantages and to increase the heat transfer performance in a plate heat exchanger in the simplest possible way and to keep the production cost as low as possible.
  • this is achieved in that the webs of each row are formed in the same direction inclined with respect to the partitions, wherein between a partition wall and the webs in each case an acute angle is clamped.
  • the angle is at least 40 °, preferably about 50 ° to 80 °, particularly preferably about 60 ° to 70 °.
  • the elevations and / or depressions of at least one row are substantially flat, preferably substantially parallel to the adjacent dividing wall.
  • the medium is deflected in the direction of the partition, resulting in good mixing and thus good heat transfer.
  • the same direction inclination of the webs large opening cross sections between the individual rows, resulting in low pressure loss and a homogeneous flow.
  • the turbulence generator is produced in two stages:
  • a cost-effective and process-stable roll-embossing process is performed.
  • the height of the turbulence generator, as well as the horizontal offset of the elevations is adjusted by the same direction inclined ridges by a leveling tool to the distance of the partitions.
  • the openings between the individual rows are widened.
  • a particular advantage is that the height of the turbulence generator is adjustable to the particular application.
  • an optimal adaptation of the parameters pressure loss, heat transfer performance and height to various heat exchanger applications is possible.
  • the plate heat exchanger 1 consists of a stack 2 of deep-drawn, trough-shaped metal plates 3, wherein the metal plates 3 at a distance from each other and parallel partition walls 10 form. From the partitions 10, a first flow space 12 is alternately spanned for a first medium and a second flow space 14 for a second medium.
  • the first medium may be oil to be cooled
  • the second medium may be a cooling medium formed by water, for example.
  • plate-like turbulence generators 16 are arranged both in the first flow space 12 and in the second flow space 14.
  • Each turbulence generator 16 has a plurality of juxtaposed strand-like rows 18, 20 with elevations 22 and depressions 24.
  • the elevations 22 are connected to the depressions 24 via webs 26, 28.
  • Two immediately adjacent rows are formed offset from each other, so that the elevations 22 and depressions 24 of a row 18 with respect to each immediately adjacent row 18, 20 are formed offset.
  • Each row 18 thus has per side wall 26, 28 a transition region 30, 32 between the two rows 18, 20, so that the depressions 24 of each row 18, 20 are in flow communication with the projections 22 of the adjacent row 20, 18.
  • the webs 26, 28 of each row 18, 20 are arranged substantially parallel to each other and inclined in the same direction, the webs 26, 28 with the adjacent partition wall 10 an angle span ⁇ , which in the exemplary embodiment is about 60 ° to 70 °.
  • the elevations 22 and depressions 24 are substantially flat, in particular formed parallel to the partitions 10.
  • the turbulence generators 16 are soldered to the adjacent partitions 10 in the region of the elevations 22 and depressions 24.
  • the production of the turbulence generator 16 can take place in two stages. In a first stage, a conventional, inexpensive and process-stable roll embossing process is carried out. In a second stage, using a leveling tool, a defined height H and a specific horizontal offset of the elevations 22 with respect to the depressions 24 are realized. In this step, the crossing areas 30, 32 are widened. During the mentioned second production stage, the height H of the turbulence generator is adjustable to the respective application. Thus, an optimal adaptation of the parameters pressure loss, heat transfer performance and height to various applications is possible.

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

Description

Die Erfindung betrifft einen Plattenwärmetauscher nach dem Oberbegriff des Anspruchs 1. So ein Wärmetauscher ist aus EP-A-1 172 625 bekannt.The invention relates to a plate heat exchanger according to the preamble of claim 1. Such a heat exchanger is off EP-A-1 172 625 known.

Plattenwärmetauscher, insbesondere Öl/Wasser-Wärmetauscher, bestehen aus mehreren übereinander gestapelten Platten, die jeweils abwechselnd mit einem ersten und einem zweiten Medium, beispielsweise Öl und Wasser, durchflossene Lagen bilden. Der aufgestellte Rand der Platten umschließt jede Wärmetauscherlage und ragt bis über den Rand der darauffolgenden Platte, so dass sich im Herstellverfahren eine dichte Lötverbindung nach außen einstellen kann. Die Anströmung der Platten erfolgt über Öffnungen in den Eckbereichen der vorwiegend rechteckig ausgeführten Platten.Plate heat exchangers, in particular oil / water heat exchangers, consist of a plurality of plates stacked one above the other, each of which alternately forms layers through which a first and a second medium, for example oil and water, flow. The erected edge of the plates encloses each heat exchanger layer and extends beyond the edge of the subsequent plate, so that in the manufacturing process, a dense solder joint can set to the outside. The flow of the plates via openings in the corners of the predominantly rectangular running plates.

Es ist bekannt, die Wärmetauscheinheiten von Wärmetauschern mit internen Turbulenzerzeugern auszustatten, um die Wärmetauschercharakteristika des Wärmetauschers zu verbessern. Im Allgemeinen veranlassen die Turbulenzerzeuger das Medium, welches durch die Wärmetauschereinheit entströmt, in einer turbulenten Art und Weise zu strömen, wobei die Wärmetauschcharakteristika des Wärmetauschers verbessert werden.It is known to provide the heat exchange units of heat exchangers with internal turbulizers to improve the heat exchanger characteristics of the heat exchanger. In general, the turbulators cause the medium, which flows through the heat exchanger unit, to flow in a turbulent manner, thereby improving the heat exchange characteristics of the heat exchanger.

Bei einem bekannten Öl/Wasser-Wärmetauscher befinden sich zwischen den einzelnen Lagen von Platten Turbulenzbleche, die mit den jeweiligen Ober- und Unterseiten der angrenzenden Platten im Herstellverfahren verlötet sind. Die Turbulenzbleche erfüllen dabei wesentliche Aufgaben:

  • Vergrößerung der Oberfläche für bessere Wärmeübertragung;
  • Verwirbelung der durchströmenden Medien für bessere Wärmeübertragung;
  • Verlängerung des Strömungsweges;
  • Abstützung der dünnwandigen Platten gegen Druckbeaufschlagung;
  • Abstützung der dünnwandigen Platten gegen Verformung beim Lötprozess.
In a known oil / water heat exchanger are located between the individual layers of plates turbulence plates, which are soldered to the respective upper and lower sides of the adjacent plates in the manufacturing process. The turbulence sheets fulfill essential tasks:
  • Enlargement of the surface for better heat transfer;
  • Turbulence of the flowing media for better heat transfer;
  • Extension of the flow path;
  • Supporting the thin-walled plates against pressurization;
  • Support of the thin-walled plates against deformation during the soldering process.

Diese Turbulenzbleche bilden somit das Kernelement des Wärmetauschers und bestimmen maßgebend die Wärmeübertragungsleistung, den Strömungswiderstand beider Medien und die mechanische Druckbeständigkeit. Bei der Konzeptionierung eines Öl/Wasser-Wärmetauschers stellen sich folgende Anforderungen an den Konstrukteur:

  • höchstmögliche Wärmeübertragungsleistung vom Ölsystem in das Kühlmittel;
  • geringer Differenzdruck ölseitig;
  • geringe bzw. passend abgestimmter Differenzdruck kühlmittelseitig;
  • geringes Bauvolumen;
  • geringster Materialaufwand;
  • einfache Struktur; und
  • Druckbeständigkeit gegen schwellenden Druckverlauf.
These turbulence sheets thus form the core element of the heat exchanger and decisively determine the heat transfer performance, the flow resistance of both media and the mechanical pressure resistance. When designing an oil / water heat exchanger, the following requirements apply to the designer:
  • highest possible heat transfer capacity from the oil system to the coolant;
  • low differential pressure on the oil side;
  • low or appropriately adjusted differential pressure on the coolant side;
  • low construction volume;
  • lowest material cost;
  • simple structure; and
  • Pressure resistance to swelling pressure curve.

Die Hauptanforderung nach hoher Wärmeübertragungsleistung verhält sich in der Praxis allerdings entgegengesetzt zu fast allen anderen Anforderungen. So sorgt zum Beispiel eine enge Struktur des Turbulenzbleches für hohe Verwirbelung und damit für einen guten Wärmeübergang, aber auch für hohen Differenzdruck. Auch steigt die Wärmeübertragungsleistung mit dem Bauvolumen (Plattenanzahl, Plattenfläche) an, welches jedoch aus Bauraum- und Kostengründen stets zu minimieren ist. Ein wesentlicher Aspekt bei der Auswahl des Turbulenzbleches ist außerdem die Herstellbarkeit. Üblich sind perforierte Aluminiumbleche, welche durch ein Roll- oder Stanzverfahren geformt werden.The main requirement for high heat transfer performance, however, is in practice contrary to almost all other requirements. For example, a narrow structure of the turbulence plate ensures high turbulence and thus good heat transfer, but also for high differential pressure. Also, the heat transfer performance increases with the volume of construction (number of plates, plate surface), which is always to minimize for space and cost reasons. An essential aspect in the selection of the turbulence sheet is also the manufacturability. Common are perforated aluminum sheets, which are formed by a rolling or stamping process.

Aus der EP 1 241 426 B1 ist ein Plattenwärmetauscher mit mehreren parallelen Trennwänden bekannt, wobei die Trennwände abwechselnd jeweils einen Durchflussraum für ein erstes Medium und für ein zweites Medium aufspannen. In den Durchflussräumen für eines der beiden Medien ist ein Turbulenzerzeuger angeordnet, welcher aus einer strukturierten Blechplatte besteht, welche nebeneinander angeordnete Reihen mit abwechselnden Erhebungen und Senken aufweist. Benachbarte Reihen sind dabei versetzt zueinander angeordnet, so dass zwischen den Reihen das Medium hindurchströmen kann. Die Erhebungen und Senken sind über zueinander geneigte Stege miteinander verbunden, wobei zwischen den Stegen der Turbulenzerzeuger einen im Wesentlichen trapezförmigen Querschnitt aufweist. Um eine optimale Wärmeableitung zu erreichen, ist es erforderlich, dass der Turbulenzerzeuger im Bereich der Erhebungen und Senken an den benachbarten Trennwänden aufliegt und diese kontaktiert. Dadurch ist es allerdings erforderlich, dass der Turbulenzerzeuger passgenau für den jeweiligen Anwendungsfall gefertigt wird. Nachteilig ist, dass für Wärmetauscher mit unterschiedlich beabstandeten Trennwänden separate Turbulenzerzeuger gefertigt werden müssen. Weiters haben Untersuchungen gezeigt, dass mit diesen bekannten Turbulenzerzeugern nicht in jedem Fall eine optimale Wärmeableitung gewährleistet ist.From the EP 1 241 426 B1 a plate heat exchanger with a plurality of parallel partitions is known, wherein the partitions alternately spanning a flow space for a first medium and a second medium. In the Flow spaces for one of the two media, a turbulence generator is arranged, which consists of a structured sheet metal plate having juxtaposed rows with alternating elevations and depressions. Adjacent rows are offset from one another so that the medium can flow through between the rows. The elevations and depressions are connected to each other via mutually inclined webs, wherein between the webs of the turbulence generator has a substantially trapezoidal cross-section. In order to achieve optimum heat dissipation, it is necessary that the turbulence generator rests against the adjacent partitions in the region of the elevations and depressions and contacts them. As a result, however, it is necessary for the turbulence generator to be made precisely fitting for the respective application. The disadvantage is that separate turbulence generators must be manufactured for heat exchangers with differently spaced dividing walls. Furthermore, investigations have shown that with these known turbulence generators not optimal heat dissipation is guaranteed in every case.

Die DE 298 24 920 U1 offenbart einen Wärmetauscher für den Wärmetausch zwischen gasförmigen Medien, bestehend aus übereinander angeordneten Profilelementen, wobei die übereinander angeordneten Profilelemente alternierend jeweils eines Winkel mit der Längsrichtung des Wärmetauschers bilden und diese Profilelemente glatte Oberflächen aufweisen und nicht mit zusätzlichen Strukturen versehen sind. Die Profilelemente können dabei eine sägezahnartige Form oder ein trapez-, falten- oder wellenförmiges Profil aufweisen. Mit derartigen Profilelementen ist allerdings keine optimale Wärmeableitung gewährleistet.The DE 298 24 920 U1 discloses a heat exchanger for heat exchange between gaseous media, consisting of superimposed profile elements, wherein the stacked profile elements alternately form an angle with the longitudinal direction of the heat exchanger and these profile elements have smooth surfaces and are not provided with additional structures. The profile elements may have a sawtooth-like shape or a trapezoidal, pleated or wavy profile. With such profile elements, however, no optimal heat dissipation is guaranteed.

Aufgabe der Erfindung ist es, diese Nachteile zu vermeiden und bei einem Plattenwärmetauscher die Wärmeübertragungsleistung auf möglichst einfache Weise zu erhöhen und den Fertigungsaufwand so gering wie möglich zu halten.The object of the invention is to avoid these disadvantages and to increase the heat transfer performance in a plate heat exchanger in the simplest possible way and to keep the production cost as low as possible.

Erfindungsgemäß wird dies dadurch erreicht, dass die Stege jeder Reihe gleichsinnig in Bezug auf die Trennwände geneigt ausgebildet sind, wobei zwischen einer Trennwand und den Stegen jeweils ein spitzer Winkel aufgespannt ist.According to the invention this is achieved in that the webs of each row are formed in the same direction inclined with respect to the partitions, wherein between a partition wall and the webs in each case an acute angle is clamped.

Besonders gute Ergebnisse können erzielt werden, wenn der Winkel mindestens 40° , vorzugsweise etwa 50° bis 80°, besonders vorzugsweise etwa 60° bis 70° beträgt.Particularly good results can be achieved if the angle is at least 40 °, preferably about 50 ° to 80 °, particularly preferably about 60 ° to 70 °.

Für eine rasche Wärmeableitung ist es von großem Vorteil, wenn die Erhebungen und/oder Senken zumindest einer Reihe im Wesentlichen flach, vorzugsweise im Wesentlichen parallel zur benachbarten Trennwand, ausgebildet sind.For a rapid heat dissipation, it is of great advantage if the elevations and / or depressions of at least one row are substantially flat, preferably substantially parallel to the adjacent dividing wall.

Dadurch, dass die Stege jeder Reihe zueinander im Wesentlichen parallel und gleichsinnig in Bezug auf die Trennwände geneigt ausgebildet sind, wird das Medium in Richtung der Trennwand abgelenkt, was zu guter Durchmischung und somit zu guter Wärmeübertragung führt. Durch die gleichsinnige Neigung der Stege ergeben sich große Öffnungsquerschnitte zwischen den einzelnen Reihen, was zu geringem Druckverlust und zu einer homogenen Durchströmung führt.Characterized in that the webs of each row are mutually inclined substantially parallel and in the same direction with respect to the partitions, the medium is deflected in the direction of the partition, resulting in good mixing and thus good heat transfer. By the same direction inclination of the webs, large opening cross sections between the individual rows, resulting in low pressure loss and a homogeneous flow.

Die Herstellung des Turbulenzerzeugers erfolgt in zwei Stufen:The turbulence generator is produced in two stages:

Zuerst wird in üblicher Weise ein kostengünstiges und prozessstabiles Walz-Prägeverfahren durchgeführt. In einer zweiten Stufe wird die Höhe des Turbulenzerzeugers, sowie der horizontale Versatz der Erhöhungen durch die gleichsinnig geneigten Stege durch ein Planierwerkzeug an den Abstand der Trennwände angepasst. Dabei werden die Öffnungen zwischen den einzelnen Reihen aufgeweitet.First, in a conventional manner, a cost-effective and process-stable roll-embossing process is performed. In a second stage, the height of the turbulence generator, as well as the horizontal offset of the elevations is adjusted by the same direction inclined ridges by a leveling tool to the distance of the partitions. The openings between the individual rows are widened.

Ein besonderer Vorteil ist, dass die Höhe des Turbulenzerzeugers an den jeweiligen Anwendungsfall einstellbar ist. Damit ist eine optimale Anpassung der Parameter Druckverlust, Wärmeübertragungsleistung und Bauhöhe auf verschiedene Wärmetauscherapplikationen möglich.A particular advantage is that the height of the turbulence generator is adjustable to the particular application. Thus, an optimal adaptation of the parameters pressure loss, heat transfer performance and height to various heat exchanger applications is possible.

Die Erfindung wird im Folgenden anhand der Figuren näher erläutert. Es zeigen:The invention will be explained in more detail below with reference to FIGS. Show it:

Fig. 1Fig. 1
einen erfindungsgemäßen Plattenwärmetauscher im Längsschnitt;a plate heat exchanger according to the invention in longitudinal section;
Fig. 2Fig. 2
das Detail II des Wärmetauschers im Schnitt; undthe detail II of the heat exchanger in section; and
Fig. 3Fig. 3
einen Turbulenzerzeuger in einer Schrägansicht.a turbulence generator in an oblique view.

Der Plattenwärmetauscher 1 besteht aus einem Stapel 2 aus tiefgezogenen, wannenförmigen Blechplatten 3, wobei die Blechplatten 3 mit Abstand zueinander und parallel angeordnete Trennwände 10 bilden. Von den Trennwänden 10 wird abwechselnd ein erster Durchflussraum 12 für ein erstes Medium und ein zweiter Durchflussraum 14 für ein zweites Medium aufgespannt. Das erste Medium kann beispielsweise zu kühlendes Öl, das zweite Medium etwa durch Wasser gebildetes Kühlmedium ausgebildet sein.The plate heat exchanger 1 consists of a stack 2 of deep-drawn, trough-shaped metal plates 3, wherein the metal plates 3 at a distance from each other and parallel partition walls 10 form. From the partitions 10, a first flow space 12 is alternately spanned for a first medium and a second flow space 14 for a second medium. For example, the first medium may be oil to be cooled, and the second medium may be a cooling medium formed by water, for example.

Im Ausführungsbeispiel sind sowohl im ersten Durchflussraum 12, als auch im zweiten Durchflussraum 14 plattenartige Turbulenzerzeuger 16 angeordnet. Jeder Turbulenzerzeuger 16 weist mehrere nebeneinander angeordnete strangförmige Reihen 18, 20 mit Erhebungen 22 und Senken 24 auf. Die Erhebungen 22 sind dabei mit den Senken 24 über Stege 26, 28 verbunden. Zwei unmittelbar aneinander grenzende Reihen sind dabei zueinander versetzt ausgebildet, so dass die Erhebungen 22 und Senken 24 einer Reihe 18 in Bezug auf jede unmittelbar benachbarte Reihe 18, 20 versetzt ausgebildet sind. Jede Reihe 18 weist somit pro Seitenwand 26, 28 einen Übertrittsbereich 30, 32 zwischen den beiden Reihen 18, 20 auf, so dass die Senken 24 jeder Reihe 18, 20 mit den Erhebungen 22 der benachbarten Reihe 20, 18 in Strömungsverbindung stehen.In the exemplary embodiment, plate-like turbulence generators 16 are arranged both in the first flow space 12 and in the second flow space 14. Each turbulence generator 16 has a plurality of juxtaposed strand-like rows 18, 20 with elevations 22 and depressions 24. The elevations 22 are connected to the depressions 24 via webs 26, 28. Two immediately adjacent rows are formed offset from each other, so that the elevations 22 and depressions 24 of a row 18 with respect to each immediately adjacent row 18, 20 are formed offset. Each row 18 thus has per side wall 26, 28 a transition region 30, 32 between the two rows 18, 20, so that the depressions 24 of each row 18, 20 are in flow communication with the projections 22 of the adjacent row 20, 18.

Die Stege 26, 28 jeder Reihe 18, 20 sind im Wesentlichen parallel zueinander angeordnet und gleichsinnig geneigt, wobei die Stege 26, 28 mit der benachbarten Trennwand 10 einen Winkel α aufspannen, welcher im Ausführungsbeispiel etwa 60° bis 70° beträgt. Um eine gute Wärmeübertragung zwischen Turbulenzerzeugern 16 und den Trennwänden 10 zu ermöglichen, sind die Erhebungen 22 und Senken 24 im Wesentlichen flach, insbesondere parallel zu den Trennwänden 10 ausgebildet. Die Turbulenzerzeuger 16 sind dabei im Bereich der Erhebungen 22 und Senken 24 mit den benachbarten Trennwänden 10 verlötet.The webs 26, 28 of each row 18, 20 are arranged substantially parallel to each other and inclined in the same direction, the webs 26, 28 with the adjacent partition wall 10 an angle span α, which in the exemplary embodiment is about 60 ° to 70 °. In order to enable a good heat transfer between turbulence generators 16 and the partitions 10, the elevations 22 and depressions 24 are substantially flat, in particular formed parallel to the partitions 10. The turbulence generators 16 are soldered to the adjacent partitions 10 in the region of the elevations 22 and depressions 24.

Durch die gleichsinnig Neigung der Stege 26, 28 ergeben sich große Übertrittsbereiche 30, 32 zwischen den einzelnen Reihen 18, 20, wodurch ein geringer Druckverlust und eine homogene Durchströmung gewährleistet ist. Die Neigung der Stege 26, 28 um den spitzen Winkel α bewirkt darüber hinaus eine Ablenkung des Mediums in Richtung der Trennwände 10, was zu guter Durchmischung und somit guter Wärmeübertragung führt.By the same direction inclination of the webs 26, 28 results in large transfer areas 30, 32 between the individual rows 18, 20, whereby a low pressure loss and a homogeneous flow is ensured. The inclination of the webs 26, 28 by the acute angle α also causes a deflection of the medium in the direction of the partitions 10, which leads to good mixing and thus good heat transfer.

Die Herstellung der Turbulenzerzeuger 16 kann in zwei Stufen erfolgen. In einer ersten Stufe wird ein übliches, kostengünstiges und prozessstabiles Walz-Prägeverfahren durchgeführt. In einer zweiten Stufe wird unter Einsatz eines Planierwerkzeuges eine definierte Höhe H und ein bestimmter horizontaler Versatz der Erhebungen 22 bezüglich der Senken 24 verwirklicht. In diesem Schritt werden die Übertrittsbereiche 30, 32 aufgeweitet. Während der erwähnten zweiten Herstellungsstufe ist die Höhe H des Turbulenzerzeugers auf den jeweiligen Anwendungsfall einstellbar. Damit ist eine optimale Anpassung der Parameter Druckverlust, Wärmeübertragungsleistung und Bauhöhe auf verschiedene Anwendungen möglich.The production of the turbulence generator 16 can take place in two stages. In a first stage, a conventional, inexpensive and process-stable roll embossing process is carried out. In a second stage, using a leveling tool, a defined height H and a specific horizontal offset of the elevations 22 with respect to the depressions 24 are realized. In this step, the crossing areas 30, 32 are widened. During the mentioned second production stage, the height H of the turbulence generator is adjustable to the respective application. Thus, an optimal adaptation of the parameters pressure loss, heat transfer performance and height to various applications is possible.

Claims (4)

  1. Plate heat exchanger with a plurality of separating walls (10) stacked one above the other, which alternatingly define a first and second flow space (12, 14) for a first and second medium, with at least one turbulence generator (16) made of sheet metal and being positioned in at least one flow space (12, 14), said turbulence generator (16) comprising a plate with a plurality of parallel-running band-like rows (18, 20) of alternating elevations (22) and depressions (24) mutually connected by straight-lined bridges (26, 28), where the elevations (22) and depressions (24) of each row (18, 20) are shifted with respect to each immediately adjacent row (18, 20), and where each row (18, 20) is provided with at least one transition area (30, 32) for the medium to pass to an immediately adjacent row (18, 20), such that the depressions (24) of each row (18, 20) are flow-connected with immediately adjacent elevations (22) of at least one immediately adjacent row (18, 20),
    characterized in that the bridges (26, 28) of each row (18, 20) are essentially parallel and equally inclined relative to the separating walls (10), with an acute angle (α) being formed between each separating wall (10) and the bridges (26, 28).
  2. Plate heat exchanger according to claim 1, characterized in that the acute angle (α) has at least 40°.
  3. Plate heat exchanger according to claim 1 or 2, characterized in that the elevations (22) and/or depressions (24) of at least one row (18, 20) are essentially configured flat, and are preferably configured essentially parallel to the adjacent separating wall (10).
  4. Method for manufacturing a turbulence generator (16) for a plate heat exchanger according to one of claims 1 to 3, wherein elevations (22) and depressions (24) are manufactured using a rolling-stamping-process, characterized in that a height (H) of the turbulence generator (16) and a horizontal shift of the elevations (22) relative to the depressions (24) are adapted to a distance between separating walls (10) by imparting an equal inclination to the bridges (26, 28) by means of a planishing tool.
EP08164770A 2007-10-04 2008-09-22 Plate heat exchanger Active EP2045556B1 (en)

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AT0156607A AT505300B1 (en) 2007-10-04 2007-10-04 Plate heat exchanger

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CN101469957A (en) 2009-07-01
US8418752B2 (en) 2013-04-16
AT505300B1 (en) 2008-12-15
US20090095456A1 (en) 2009-04-16
EP2045556A2 (en) 2009-04-08
AT505300A4 (en) 2008-12-15
EP2045556A3 (en) 2010-03-17
CN101469957B (en) 2012-07-25

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