DE102014006331A1 - Plate heat exchanger and method of making a plate heat exchanger - Google Patents

Abstract

The invention relates to a plate heat exchanger, which is composed of several heat exchanger modules, and a method for producing the plate heat exchanger according to the invention. The plate heat exchanger (1) comprises at least a first heat exchanger module (10) and at least one second heat exchanger module (20) and at least one connection unit (40), the connection unit (40) having a first angle element (41) on the first heat exchanger module (10) and a second Angle element (42) on the second heat exchanger module (20) and the two angle elements (41, 42) positively and / or non-positively connected to each other, so that each of the associated heat exchanger modules (10, 20) at least the translational degree of freedom in the coordinate direction is taken, in which the respective other heat exchanger module (10, 20) is arranged. The angle elements (41, 42) are fastened to the respective heat exchanger module (10, 20) by means of hole welding or hole soldering. Furthermore, the invention relates to a method for producing the plate heat exchanger according to the invention.

Description

The invention relates to a plate heat exchanger, which is composed of several heat exchanger modules, and a method for producing the plate heat exchanger according to the invention.

Brazed plate heat exchangers made of aluminum have been established in numerous systems for heat transfer at various pressures and temperatures. For example, you can find applications in the separation of air, the liquefaction of natural gas or in plants for the production of ethylene.

Such a plate heat exchanger is z. In ALPEMA report (2000) "The standards of the brazed aluminum plate-fin heat exchanger manufactures association" described. A taken from this figure is in the 1 represented as state of the art and described below.

With the in 1 illustrated plate heat exchanger 1 a heat exchange between five different process streams A, B, C, D and E can be realized. It is designed block-shaped and with various means 6 provided for the supply and discharge of the individual process media. These funds 6 are also referred to as nozzles. The heat exchanger also has several means 7 for distributing and collecting the individual process streams A, B, C, D and E, which are also referred to as headers.

In essence, the plate heat exchanger includes 1 a plurality of stacked passages 3 passing through dividers 4 are separated from each other. In the individual passages 3 the various media can flow. The heat exchange takes place indirectly via the heat contact, through the cover plates 5 and realized by the wavy structure (also referred to as fins) arranged in the passages. About the neck 6 The individual media A, B, C, D and E are in the headers 7 guided and so on the respectively provided, stacked passages 3 distributed. In the entrance area of the passages are so-called distributor fins 2 arranged for an even distribution of the medium within each passage 3 to care. The media thus flow transversely to the shaft direction of the fins 3 through the passages 3 , The fins 3 are with the dividers 4 connected, whereby an intense Wärmeleitkontakt is produced. This allows heat exchange between two different media in adjacent passages 3 stream. As seen in the flow direction at the end of the passage, there are similar manifold fins 2 containing the media from the passages in the headers 7 Lead where they are collected and over the neck 6 subtracted from. The individual passages 3 are by so-called sidebars 8th completed to the outside. The outer boundary of the entire heat exchanger block is covered by cover plates 5 realized.

Such plate heat exchangers are ideal for heat exchange between at least two media. By appropriate construction, however, as in 1 shown, even more than two media participate in the heat exchange. This allows a very efficient process management and effective heat and cold utilization.

Modern plate heat exchangers are for example brazed aluminum. The individual passages with the fins, distributor fins, cover plates and sidebars are stacked on each other, provided with solder and brazed in an oven. On the resulting block then headers and nozzles are welded.

In this production method, the size and geometry of the soldering furnace also determines the maximum size of a plate heat exchanger block to be accommodated therein. Often, however, the process requirements require a larger heat exchange area and thus larger heat exchanger blocks. To meet these requirements, some plate heat exchangers include at least two modules. A module is to be understood as meaning a heat exchanger block which is produced in a brazing furnace as described above. Several such modules are interconnected in the prior art and provided with common headers for distribution and collection of the heat exchanging media. The connection between two different modules of a plate heat exchanger takes place via sidebars.

The in 1 illustrated conventional plate heat exchanger comprises only one module. To produce a multi-module plate heat exchanger, a first heat exchanger module is created 10 or a first heat exchanger block as in 1 is shown, ie initially without headers and nozzles, with a second such heat exchanger module 20 or welded heat exchanger block, as in 2 indicated. On the cover plate 100 be along the edges 110 of the cover plate 100 sidebars 8th welded. The second heat exchanger module 20 that with the first heat exchanger module 10 to be connected, is arranged such that the two immediately adjacent sides of the two modules 10 . 20 essentially plane-parallel to each other. The area covered by a cover plate 100 is formed, which is another module 10 . 20 is immediately adjacent, is also referred to as a contact surface. To connect the modules 10 . 20 becomes the cover plate 100 with the sidebars 8th on the cover plate 100 of the immediately adjacent module 10 . 20 welded. The sidebars 8th therefore form almost a frame on the cover plate 100 , This frame comes with the cover plate 100 of the adjacent module 10 . 20 welded and so a connection between two modules 10 . 20 produced. The two connected modules 10 . 20 thereby form a heat exchanger block, which is greater than the actual geometry of the brazing oven allowed. In this way any number of modules 10 . 20 be connected together to an arbitrarily large heat exchanger block or plate heat exchanger. There are two adjacent modules 10 . 20 at least one common header 7 on.

Between two modules 10 . 20 such a plate heat exchanger 1 thus forms between the cover sheets 100 a non-traversed and non-heat exchanging and non-pressurized air-filled space. Accordingly, the thermal contact between two modules 10 . 20 significantly worse than the thermal contact within a module. This leads to thermally induced stresses in plate heat exchangers 1 with at least two modules 10 . 20 in different applications. Such a space between modules is the same EP 2 645 038 A1 removable. Here the modules are connected to each other by means of moldings and spaced from each other.

Due to these thermally induced stresses and the associated dangers of strength reduction, joint welds for connecting the individual modules are often no longer completely guided around the respective block, but interrupted. However, it may come at the weld ends to voltage peaks that are above the allowable voltages. Not to be excluded Wanddickensprünge as well as gaps in the weld root can also lead to shape notches, which also increase the voltage, as well as microstructure notches that result from the combination of different materials of the module and the welding filler. This means that there is an increased risk of cracking at the weld ends.

The invention is therefore an object of the invention to provide a plate heat exchanger comprising a plurality of modules, as well as a method for producing this plate heat exchanger, which combine a long life of the plate heat exchanger with efficient and cost-effective production.

This object is achieved by the plate heat exchanger according to the invention according to claim 1 and by the inventive method for producing a plate heat exchanger according to claim 9. Advantageous embodiments of the plate heat exchanger according to the invention are specified in the subclaims 2-8. Advantageous embodiments of the method according to the invention for producing a plate heat exchanger are specified in the subclaims 10 and 11.

The plate heat exchanger according to the invention comprises at least a first and at least a second heat exchanger module and at least one connection unit, wherein the connection unit comprises a first angle element on the first heat exchanger module and a second angle element on the second heat exchanger module and the two angle elements are positively and / or non-positively connected, so that a each of the associated heat exchanger modules at least the translational degree of freedom is taken in the coordinate direction in which the respective other heat exchanger module is arranged. That is, each heat exchanger module in the direction of the array can neither move away from the other heat exchanger module nor move toward the other heat exchanger module. It is inventively provided that the angle elements are fastened to the respective heat exchanger module by means of hole welding or Lochlötung.

By the connection means between the heat exchanger modules, it is possible to establish a fixed mechanical connection between the modules, so that acting forces between the modules or moments no longer need to be transmitted alone through the weld on the outer surfaces of the modules. The proportion of loading forces or moments transmitted by the connecting device reduces the amount of stress that must be borne by the module weld. As a result, voltage peaks at the modular weld seam ends and thus the risk of cracking can be reduced.

By Lochlötung or hole welding, the production of a mechanical connection between a respective angle element and the associated heat exchanger module is made possible substantially in the middle of the angle element, and thus also in the vicinity of the introduction of opposing angle element applied shear forces and / or bending moments. Furthermore, relatively little heat is introduced into the angle element in the hole welding or soldering, so that less heat-induced distortion is to be feared. In addition, heat is introduced only selectively. Due to the substantially central arrangement of the Lochschweißungs- or Lochlötungspunkte in the angle element and the optimal distributability of Lochschweißungs- or Lochlötungspositionen on the angle element, only a slight stress-induced distortion of the angle element is recorded, since the used for welding or soldering hole substantially produces the mechanical connection in the area of the greatest bending-induced deformation.

It follows that the angle elements to be combined in a respective connection unit can be manufactured and positioned with very small tolerances, whereby an optimal force or torque transmission between the modules via the connection unit can be realized. This in turn means that the force or torque component which can be transmitted by the connecting device can be substantially larger than the force or torque component that has to be absorbed by the module connecting weld seam. This can blatantly reduce the risk of crack formation on the module weld.

In a preferred embodiment of the plate heat exchanger according to the invention, this has a plurality of connection units between the first heat exchanger module and the second heat exchanger module, wherein the angle elements of the connecting units each have an angle leg which is at a distance from the surface of the heat exchanger module, on which the respective angle element is arranged, and the angle legs of the angle members on a heat exchanger module are aligned in one direction. Such an angle leg may be, for example, a leg of a typical L-profile, in the form of which the angle element can be formed.

Preferably, such an angle leg is parallel to the surface of the heat exchanger module, on which the respective angle element is arranged. The angle legs of the connection units arranged on a heat exchanger module all point in a running direction of a coordinate axis. In an alternative embodiment, the angle legs of the connecting elements on a heat exchanger module in opposite directions of a coordinate axis, where they may be facing or facing each other. In an arrangement in which the angle legs face each other, a T-slot or - at an angular course of the angle leg - a dovetail profile is formed.

The present invention is not limited to the arrangement of L-shaped angle elements, but the angle elements may alternatively be realized with a U-shaped cross-section, as in the EP 2 645 038 A1 resist given.

In the preferred orientation of the angle leg in one direction, the angle leg of the second angle element between the first heat exchanger module and the angle leg of the first angle element in the direction of the longitudinal extension of the preferably rail-like angle elements and thus can be inserted perpendicular to the extension of the angle leg on the angle element, and / or at the same time parallel to the direction of extension of the angle legs insert.

As mentioned, a possible arrangement of the angle legs of the angle elements is designed such that the angle legs of the angle elements extend substantially parallel to the surface of the respective heat exchanger module, on which the angle element is arranged. Preferably, the angle legs are exactly parallel to the surface of the heat exchanger module.

To ensure the power transmission between the angle legs of a connection unit is preferably provided that the distance of an angle leg of the first angle element to the surface of the first heat exchanger module, on which the first angle element is arranged, is as large as the thickness of an angle leg of the second angle element of the same connection unit, and the angle leg of the second angle element is pushed between the angle legs of the first angle element and the first heat exchanger module. The distance of an angle leg of the second angle element to the surface of the second heat exchanger module, on which the second angle element is arranged, is as large as the thickness of an angle leg of the first angle element of the same connection unit, wherein the angle leg of the first angle element between the angle leg of the second angle element and the second heat exchanger module is pushed. Thus, the spaces between the angle legs and the respective surfaces of the heat exchanger modules and the legs of the associated opposite angle elements complement each other in terms of shape complementary. Especially by doing so allows a compressive force can be transmitted from one module to the adjacent module via the connection unit without play.

Advantageously, while the angle leg and the distances of a respective angle leg to the surface of the heat exchanger module, on which the respective angle element is arranged, made flat, so that the gap or gap between the heat exchanger modules is dimensioned small. Preferably, the thickness of an angle leg should be at most half, more preferably at most one third of the angle leg length.

Deviating from the parallel course of the angle leg to the surface of the heat exchanger modules, the angle legs of the angle elements, which together form a connection unit, respectively at an angle of 10-45 ° to the surface of the heat exchanger module, on which the respective angle element is arranged extend, wherein they are in the Substantially and preferably run exactly parallel. Also in this embodiment, the angle legs are arranged in the interstices of the opposite angle elements with which they each form a connection unit.

In a favorable embodiment, the angle leg of at least one angle element of a connection unit at its leg end on the side facing the heat exchanger module connected to the angle element by means of hole welding or hole soldering, a convex curve on. This convex curvature is particularly advantageous if the connecting elements of an associated angle elements are not only pushed into each other, but in a combinatorial movement of rotation and translation are moved into each other. The radius of the convex curve should preferably be 0.3 to 0.8 times the thickness of the angle leg on which the convex curve is arranged.

In a further advantageous embodiment, it is provided that at least one angle element of a connection unit has an angled web, which is connected by means of plug welding or Lochlötung with a heat exchanger module, wherein the respective angle leg is connected to the Winkelsteg and enclosed by angle leg and Winkelsteg area a concave rounding between angle leg and Winkelsteg has. With this concave rounding, a complementary shape for rounding the angle leg of the engaging angle element can be achieved in the area of the angle foot or angular web, and thus likewise ensure a secure transmission of force or moment. Again, the radius of the concave curve should be 0.3 ... 0.8 times the thickness of the angle leg of this angle element, which has the concave curve.

In order to avoid heat losses and to increase the overall stability or strength of the plate heat exchanger according to the invention, it is preferably provided that the heat exchanger modules are externally clad at least partially by means of a cover plate, wherein cover plates of adjacent heat exchanger modules are welded or soldered together.

Thus, there is provided a plate heat exchanger which enables reliable force or torque transmission between individual heat exchanger modules in a simple and reliable manner, without overloading a weld seam on the outer skin of the interconnected modules.

To solve the problem, a method for producing a heat exchanger is also provided, are attached to the heat exchanger modules of the plate heat exchanger, the angle elements of the connection unit on the respective heat exchanger module by plug welding or Lochlötung, and the heat exchanger modules by means of positive and / or non-positive connection of the two Angle elements of the connection unit can be connected.

In this case, after fixing the angle elements of the connection unit on the respective heat exchanger module, the two heat exchanger modules are positioned to each other such that the angle legs of the angle elements of the connection unit parallel to each other, and the heat exchanger modules are then translationally displaced relative to each other, so that the angle leg of the first angle element in the space moved between the angle leg of the second angle element and the second heat exchanger module.

In an alternative embodiment of the production method, it is provided that after fastening the angle elements of the connection unit to the respective heat exchanger module, the two heat exchanger modules are positioned relative to one another such that the angle legs of the angle elements of the connection unit run at an angle to each other, wherein the angle can be up to 25 °, but preferably should be chosen smaller. The heat exchanger modules are then moved translationally and rotationally relative to each other so that the angle leg of the first angle element moves into the space between the angle leg of the second angle element and the second heat exchanger module. Such a movement can be carried out in particular if at least one angle limb of an angle element of the connection unit has the convex curvature.

The invention will be explained below with reference to the embodiments illustrated in the accompanying drawings.

It shows

1 a conventional plate heat exchanger according to the prior art,

2 two heat exchanger modules assembled to a conventional plate heat exchanger,

3 a first angle element,

4 the section A of in 3 represented angle element,

5 an indicated first heat exchanger module with angular elements arranged thereon,

6 an indicated first heat exchanger module with first angle elements arranged thereon in an alternative embodiment,

7 a plate heat exchanger according to the invention without weld,

8th a plate heat exchanger according to the invention with weld.

On the 1 and 2 has already been referred to the explanation of the prior art.

In 3 is a perspective view of a first angle element 41 shown. This first angle element 41 has essentially the shape of an L-profile. It includes an angular web 50 , of which here is an example of an angle leg 60 extends vertically. In the area of the Winkelsteges are several holes 61 incorporated, which are used to carry out the inventive hole welding or Lochlötung. It can be seen that the holes 61 relatively close to the area of the notch or the angle between the angle web 50 and angle legs 60 extend, leaving one in the holes 61 made welding or soldering and the mechanical connection thus produced also relatively close to the angle web 50 bordering edge is executable.

In 4 is an enlarged view of the section A from 3 shown. Clearly recognizable here is a convex curve 81 at the end of the leg 80 of the angle leg 60 , Also visible is a concave curve 91 from the Winkelsteg 50 and angle legs 60 enclosed area 90 ,

The radius r of the convex curve 81 is preferably 0.3 to 0.8 times the thickness of the angle leg 60 , The radius R of the concave curve 91 is preferably 0.3 to 0.8 times the thickness of the angle leg 60 ,

Especially with relatively flat running angle elements allows the convex curve 81 a combinatorial movement of rotation and translation of the angle elements into each other, without causing a tilting of the angle elements. As a result, the assembly can be much easier or realize in less time and / or with less expensive tools.

In the 5 and 6 is in each case a first heat exchanger module 10 shown on the module surface 30 which through a cover plate 100 is executed, in each case two first angle elements 41 are arranged. It can be seen that the angle elements 41 in the in the 5 and 6 illustrated embodiments each show in different directions, but depending on the embodiment, the angle leg 60 the first angle elements 41 always point in the same direction. It is recognizable that between the angle legs 60 and the module surface 30 one distance each 70 exists, so between angle leg 60 and module surface 30 one space each 71 is trained.

In 7 is a plate heat exchanger according to the invention 1 in a simplified representation, the first heat exchanger module 10 and a second heat exchanger module 20 comprising, wherein the two heat exchanger modules 10 . 20 by means of two connecting units exemplified here 40 mechanically interconnected. The connection units 40 each comprise a first angle element 41 and a second angle element 42 , The two heat exchanger modules 10 . 20 are positioned in such a way to each other that the angle leg 60 the respective angle elements of a connection unit 40 engage in the intermediate space between the respective other angle element and the respective other heat exchanger module. By intervening in this undercut can be tensile forces between the heat exchanger modules 10 . 20 optimally transmitted. Due to a preferred fit of a respective angle leg in the space between the respective other angle leg and the respective module surface 30 can be pressure forces and / or bending moments optimally between the heat exchanger modules 10 . 20 transfer.

In 8th is a plate heat exchanger according to the invention 1 can be seen, in which the two heat exchanger modules 10 . 20 by means of welds 200 that between edges 110 their respective cover sheets 100 are executed, are connected. For the purposes of the invention, a cover plate is understood to mean any lining plate which has at least one section of the outer wall of the respective module 10 . 20 Are defined. That means that a weld by means of 200 connected cover plate at least partially forms a module surface facing the respective other heat exchanger module, or also forms a perpendicular thereto, with a corresponding surface of the adjacent heat exchanger module flush surface. 1 Plate heat exchanger 2 Verteilerfin 3 passage 4 Divider 5 cover sheet 6 Means for supply and removal 7 header 8th sidebar A, B, C, D, E process stream 10 first heat exchanger module 20 second heat exchanger module 30 module surface 40 connecting unit 41 first angle element 42 second angle element 50 Winkelsteg 60 angle leg 61 hole 70 distance 71 gap 80 leg end 81 convex curve r Radius of the convex curve 90 enclosed area 91 concave rounding R Radius of the concave curve 100 cover sheet 110 Cover plate edge 200 Weld

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2645038 A1 [0010, 0020]

Cited non-patent literature

• ALPEMA report (2000) [0003] "The standards of the brazed aluminum plate heat exchanger manufactures association"

Claims (11)

Plate heat exchanger ( 1 ), comprising at least a first heat exchanger module ( 10 ) and at least one second heat exchanger module ( 20 ) and at least one connection unit ( 40 ), wherein the connection unit ( 40 ) a first angle element ( 41 ) on the first heat exchanger module ( 10 ) and a second angle element ( 42 ) on the second heat exchanger module ( 20 ) and the two angle elements ( 41 . 42 ) are positively and / or non-positively connected to each other, so that each of the associated heat exchanger modules ( 10 . 20 ) at least the translatory degree of freedom in the coordinate direction is taken, in which the respective other heat exchanger module ( 10 . 20 ), characterized in that the angular elements ( 41 . 42 ) at the respective heat exchanger module ( 10 . 20 ) are fastened by means of hole welding or hole soldering. Plate heat exchanger according to claim 1, characterized in that the plate heat exchanger ( 1 ) several connection units ( 40 ) between the first heat exchanger module ( 10 ) and the second heat exchanger module ( 20 ), wherein the angular elements ( 41 . 42 ) of the connection units ( 40 ) each have an angle leg ( 60 ) which is at a distance from the surface ( 30 ) of the heat exchanger module ( 10 . 20 ), on which the respective angle element ( 41 . 42 ), runs, and the angle legs ( 60 ) of the angular elements ( 41 . 42 ) on a heat exchanger module ( 10 . 20 ) are aligned in one direction. Plate heat exchanger according to one of the preceding claims, characterized in that the angle legs ( 60 ) of the angular elements ( 41 . 42 ) substantially parallel to the surface of the heat exchanger module ( 10 . 20 ), on which the respective angle element ( 41 . 42 ) is arranged, run. Plate heat exchanger according to one of claims 2 and 3, characterized in that the distance of an angle leg ( 60 ) of the first angle element ( 42 ) to the surface ( 30 ) of the first heat exchanger module ( 10 ) is as large as the thickness of an angle leg ( 60 ) of the second angle element ( 42 ) of the same connection unit ( 40 ), and that the angle leg ( 60 ) of the second angle element ( 42 ) between the angle legs ( 60 ) of the first angle element ( 41 ) and the first heat exchanger module ( 10 ) and that the distance of an angle leg ( 60 ) of the second angle element ( 42 ) to the surface ( 30 ) of the second heat exchanger module ( 20 ) is as large as the thickness of an angle leg ( 60 ) of the first angle element ( 41 ) of the same connection unit ( 40 ), and that the angle leg ( 60 ) of the first angle element ( 41 ) between the angle legs ( 60 ) of the second angle element ( 42 ) and the second heat exchanger module ( 20 ) is pushed. Plate heat exchanger according to one of claims 1 and 2, characterized in that the angle legs ( 60 ) of the angular elements ( 41 . 42 ), which together form a connection unit 40 each at an angle of 1 ° ... 45 ° to the surface ( 30 ) of the heat exchanger module ( 10 . 20 ), on which the respective angle element ( 41 . 42 ), and are substantially parallel to each other. Plate heat exchanger according to one of claims 2 to 5, characterized in that the angle leg ( 60 ) at least one angle element ( 41 . 42 ) a connection unit ( 40 ) at its leg end ( 80 ) on the side opposite to the angle element ( 41 . 42 ) heat exchanger module connected by hole welding or hole soldering ( 10 . 20 ), a convex curve ( 81 ) having. Plate heat exchanger according to one of claims 2 to 6, characterized in that at least one angle element ( 41 . 42 ) a connection unit ( 40 ) an angular web ( 50 ), which by means of plug welding or hole soldering with a heat exchanger module ( 10 . 20 ) is connected to the angle web ( 50 ) the respective angle leg ( 60 ) and that of angle leg ( 60 ) and angle bar ( 50 ) enclosed area ( 90 ) a concave curve ( 91 ) between angle legs ( 60 ) and angle bar ( 50 ) having. Plate heat exchanger according to one of the preceding claims, characterized in that the heat exchanger modules ( 10 . 20 ) at least partially by means of a cover plate ( 100 ) are covered externally, with cover plates ( 100 ) of adjacent heat exchanger modules ( 10 . 20 ) are welded or soldered together. Method for producing a plate heat exchanger ( 1 ) according to one of claims 1 to 8, in which the heat exchanger modules ( 10 . 20 ) of the plate heat exchanger ( 1 ) the angular elements ( 41 . 42 ) of the connection unit ( 40 ) at the respective heat exchanger module ( 10 . 20 ) by means of hole welding or hole soldering be attached, and the heat exchanger modules ( 10 . 20 ) by means of positive and / or non-positive connection of the two angle elements ( 41 . 42 ) of the connection unit ( 40 ) get connected. Method for producing a plate heat exchanger ( 1 ) according to claim 9, characterized in that after fixing the angle elements ( 41 . 42 ) of the connection unit ( 40 ) at the respective heat exchanger module ( 10 . 20 ) the two heat exchanger modules ( 10 . 20 ) are positioned relative to each other such that the angle legs ( 60 ) of the angular elements ( 41 . 42 ) of the connection unit ( 40 ) parallel to each other, and the heat exchanger modules ( 10 . 20 ) are then translationally displaced relative to each other, so that the angle leg ( 60 ) of the first angle element ( 41 ) into the space ( 71 ) between the angle leg ( 60 ) of the second angle element ( 42 ) and the second heat exchanger module ( 20 ) emotional. Method for producing a plate heat exchanger ( 1 ) according to claim 9, characterized in that after fixing the angle elements ( 41 . 42 ) of the connection unit ( 40 ) at the respective heat exchanger module ( 10 . 20 ) the two heat exchanger modules ( 10 . 20 ) are positioned relative to each other such that the angle legs ( 60 ) of the angular elements ( 41 . 42 ) of the connection unit ( 40 ) run at an angle to each other, and the heat exchanger modules ( 10 . 20 ) are then moved translationally and rotationally relative to each other, so that the angle leg ( 60 ) of the first angle element ( 41 ) into the space ( 71 ) between the angle leg ( 60 ) of the second angle element ( 42 ) and the second heat exchanger module ( 20 ) emotional.

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