DE102008059737A1 - Cross-flow heat exchanger - Google Patents

Abstract

The invention relates to a cross-flow heat exchanger (1) for a motor vehicle, with tubes (10-12), which flows through a medium and flows around another medium, with at least one collecting box (2, 3), in which open the tubes , and with guide elements (13, 14), which are arranged between the tubes (10-12). In order to provide a heat exchanger which is inexpensive to produce and has a relatively high efficiency, the collecting box (2, 3) and the tubes (10-12) made of plastic and the guide elements (13, 14) are formed of metal.

Description

The The invention relates to a cross-flow heat exchanger for a motor vehicle, with pipes that flows through a medium and be surrounded by another medium, with at least a collecting box, into which the pipes open, and with guide elements, which are arranged between the tubes.

Cross-flow heat exchangers can be made entirely of metal, for example aluminum, or of plastic. There are also heat exchangers in which the plastic collecting tank and the heat exchanger block are formed with the pipes and the corrugated fins made of metal. From the German disclosure documents DE 37 33 866 A1 and DE 42 44 017 A1 Heat exchangers are known with plastic water tanks, metal pipes and laminations. From the German patent application DE 100 20 798 A1 is a heat exchanger with a tube bundle is known, which is formed solely of flexible plastic tubes. The tubes are made by extruding a polyamide. Spacers hold the tubes at a selected distance. From the German patent DE 44 11 745 C1 is a heat exchanger with a plurality of heat exchanger tubes made of polytetrafluoroethylene known, which are used end in tube sheets of polyfluoroalkyl. From the German patent application DE 10 2005 050 293 A1 is a mat-shaped heat exchanger known by flowing through a heating or cooling medium flexible plastic pipes. The mat-shaped heat exchanger is usually attached to a ceiling, a wall or on a floor and then covered by a thin plaster or screed layer. The use of a contact with the plastic pipes in contact aluminum foil allows a greater distance between the plastic pipes. Other heat exchangers with parts made of plastic are from the German patents DE 42 29 393 A1 . DE 42 38 742 A1 . DE 43 38 959 A1 and DE 195 43 740 A1 known.

task The invention is a heat exchanger according to the To provide preamble of claim 1, the cost can be produced and has a relatively high efficiency.

The Task is with a cross-flow heat exchanger for a motor vehicle, with pipes that flows through a medium and be surrounded by another medium, with at least a collecting box, into which the pipes open, and with guide elements, which are arranged between the tubes, thereby solved that the collecting box and the pipes are made of plastic and the guiding elements Metal are formed. For example, the collection box can be essentially cuboid or kreiszylindermantelelförmig, the means as a manifold, be executed. The collection box but can also have a different shape and will therefore according to his Function also referred to as a collector. Preferably extend the tubes, together with the guide elements, in particular corrugated fins, forming the heat exchanger block, between two substantially identical or similar executed collection boxes. According to an essential aspect of the invention are in the heat exchanger block pipes made of plastic Guide elements, in particular corrugated fins, made of metal combined. Of the Heat exchanger according to the invention is in Compared to an aluminum heat exchanger lighter and cheaper to produce. It requires the Heat exchanger according to the invention about the same space and has similar air and coolant side Pressure drops on. By the guiding elements, in particular Corrugated ribs, made of metal, especially aluminum, can be undesirable Great performance losses compared to aluminum heat exchangers be prevented.

One preferred embodiment of the cross-flow heat exchanger is characterized in that the pipes of plastic with the collecting box made of plastic are welded. The pipe ends are preferably welded to a bottom of the header tank. The collecting box can be made in one piece and multipart. The single ones Parts of the collecting tank are preferably together and with the Welded floor. As a result, a high density can be achieved become.

A further preferred embodiment of the cross-flow heat exchanger is characterized in that the tubes and / or the collecting box are formed from at least one plastic of the following group: chlorinated polyethylene (PE), polypropylene (PP), polyvinylidene fluoride (PVDF), polyphenylene oxides (PPO ), Polyetherimides (PI), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), polyphenylene sulfide (PPS), self-reinforcing polymer (SRF), polyaryletherketone (PEEK), polytetrafluoroethylene (PTFE), silane-modified and / or cross-linked polypropylene (PP) , Silane-modified and / or cross-linked high density polyethylene (PE-HD), perfluoroalkoxy copolymer (PFA), polyphthalamide (PPA), polyamide (PA XXX), polysulfun (PSF), polyimide (PI). These plastics have proven to be particularly advantageous in the context of the present invention. Advantageously, the tubes and the collecting box are formed from the same material. As a result, the production and / or welding of the individual parts are facilitated with each other. But the pipes and the collecting tank can also be formed of different materials. It is also possible to form individual tubes or tube groups from different materials, if the individual tubes or tube groups come into contact with different materials or are exposed to different temperatures.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that the pipes are made of a plastic are formed, filled with heat-conductive fillers is. As fillers are within the scope of the present Invention, for example, metal powder, graphite or ceramic advantageous exposed. Depending on the arrangement or orientation of Fillers in the base material can increase the thermal conductivity be increased significantly.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that the collecting box has a bottom Through holes comprises, the peripheral edge of a stop forms for the pipes. The bottom of the collecting tank represents the interface to the pipes. The floor can be one-piece be connected to the collection box. Preferably, the soil is but executed as a separate part, the cohesive connected to the collecting box. The through holes are preferably adapted to the shape of the pipe ends. This means, the through holes preferably have the same cross section like the pipe ends inside. Thus, the peripheral edge forms during assembly the pipes a stop.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that the peripheral edge by a circumferential Collar is framed, in which the pipes are inserted with their ends are. Through the collar, the contact surface between enlarged the pipe ends and the bottom.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that the collar welded to the pipe ends are. This is a simple way a tight connection between the pipe ends and the bottom or the collecting box produced.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that the tubes are designed as flat tubes are. The flat tubes preferably have the shape in cross section a long hole. Alternatively, the pipes can also have a round or an angular cross-section.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that the tubes are extruded. At the The pipes can extrude inside and / or outside be provided with a cross-sectional profile.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that the tubes each have at least one have inner web. Through the bridge, the tubes are in cross section divided into several channels. According to one essential aspect of the invention, however, the webs serve significantly increase the rigidity of the pipes.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that the tubes form fit connected to the guide elements and / or partially of the plastic material surrounded by the tubes. This will create a stable connection between created the guide elements and the tubes. This connection will For example, achieved by using the pipes, for example with Help of heating plates and heating elements, before joining be heated with the guide elements. After heating is the heat exchanger block with the preheated Tubes and the guide elements pressed together.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that the guide elements as corrugated ribs are executed with bending or bending points. The corrugated ribs are preferably substantially zigzag in a known manner folded and formed of aluminum or an aluminum alloy.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that in the region of bending or kinking in each case at least one tab is bent out of the corrugated rib, which, at least partially, arranged in the associated pipe is. By the penetration of the tab of metal in the preferably preheated plastic material from which the associated Tube is formed, a stable bond between pipe and corrugated fin created. It is also possible that the tab is up extends into the interior of the tube.

One Another preferred embodiment of the cross-flow heat exchanger is characterized in that in the region of bending or kinking in each case at least one opening is provided by the pipe material is penetrated. The opening can, at least partially enclosed by a wreath. The preferably heated Plastic material is expressed during compression of the Heat exchanger block through the opening, so that an undercut is created. This can be easy on Way a stable connection between the pipe and the corrugated fin be created.

Further Advantages, features and details of the invention will become apparent the following description, with reference to the drawing various embodiments described in detail are. Show it:

1 a perspective view of a heat exchanger according to the invention

2 the heat exchanger 1 on average;

3 a perspective view of a header of the heat exchanger from the 1 and 2 ;

4 an enlarged view of the joint between the collection box 3 and the pipes in section;

5 a tube designed as a flat tube with inner webs;

6 a similar tube as in 5 according to a further embodiment;

7 a corrugated rib with bent at the bending or bending points tabs;

8th a section of a heat exchanger with pipes and corrugated fins having up / down bent portions;

9 a corrugated fin with an additional, gill-like ribbing;

10 a corrugated fin with through holes at the kinks or bending points;

11 an enlarged section 10 ;

12 a similar heat exchanger as in 1 with metal strips as outer ribs;

13 a perspective view of a metal strip of the heat exchanger 12 and

14 an enlarged section 13 ,

In the 1 and 2 is a heat exchanger 1 , which is also referred to as a heat exchanger, shown in different views. The heat exchanger 1 includes two collection boxes 2 and 3 , which have an approximately semicircular cross-section, and are therefore also referred to as manifolds. These collection boxes 2 . 3 However, they can also have a different shape and serve in a known manner to collect a medium to be cooled or to be heated. Therefore, the collection boxes 2 . 3 also referred to as a collector. For feeding and discharging the medium, the collection box 2 two connecting pieces 4 . 5 on, preferably in one piece with the collecting box 2 are connected.

Between the two collection boxes 2 . 3 extends a heat exchanger block 8th with pipes 10 . 11 . 12 , which are designed as flat tubes. Between two tubes is in each case a guide element in a known manner 13 . 14 arranged in the form of a corrugated fin. The heat exchanger 1 may also have in a known manner, only a collection box into which open the tubes with one end, when the tubes are provided at their other ends with a likewise known deflection. By arrows 15 . 16 . 17 are in 1 the expansion directions of the heat exchanger 1 in the deep 15 , in width 16 and the height 17 indicated. The extent of the heat exchanger 1 in width 16 corresponds to the longitudinal extent or longitudinal direction of the collecting tanks 2 . 3 ,

The in the 1 and 2 illustrated heat exchanger 1 is also referred to as a heat exchanger and is designed as Kreuzströmer. In the collection boxes 2 . 3 For example, a coolant is collected and passed through the pipes 10 to 12 directed. Through the guide elements 13 . 14 between the pipes 10 to 12 flows in crossflow to the coolant, for example, air. Depending on the intended use, the air is either cooled or heated. The heat exchanger 1 is preferably used as a coolant radiator, radiator, oil and Öhlenkhilfekühler, evaporator or condenser in the automotive field. In 2 is indicated that the medium, such as refrigerant or coolant, in the collection box 2 through a partition 20 can be redirected. The medium can be stored in the collection boxes 2 . 3 both in depth 15 as well as in width 16 of the heat exchanger 1 be redirected.

According to an essential aspect of the invention, the tubes 10 to 12 and the collection boxes 2 . 3 made of plastic. The guiding elements 13 . 14 In contrast, are not made of plastic but of metal, preferably made of aluminum or an aluminum alloy. The plastic parts of the heat exchanger 1 are manufactured for example by injection molding or gas injection molding and / or extrusion.

The plastic parts are then joined by a suitable welding method in a simple manner cohesively or connected to each other. Various measures are provided by the present invention, such as the guiding elements 13 . 14 made of metal with the collection boxes 2 . 3 and the pipes 10 to 12 Made of plastic in a suitable manner can be connected together. These measures relate in particular to the shape of the joining partners and a special joining methodology.

The collection boxes 2 . 3 and / or the pipes 10 to 12 are preferably formed from a plastic which is resistant to a water-glycol mixture. The plastic used preferably has a very high aging, hydrolysis and permeation resistance in the coolant. In addition, the plastic used can withstand pressures of up to 6 bar and temperatures of up to 135 degrees Celsius. For reasons of manufacturability and processability, a thermoplastic is preferably used as the plastic.

To the heat conduction in the plastic pipes 10 to 12 To increase, it may be advantageous to provide the plastic used with heat-conductive fillers, such as metal powder, graphite or ceramic. By way of example, fillers with the short designations BN, SiC, Beo, AlN and Al-oxides are mentioned. Depending on the arrangement or orientation of the fillers in the base material, the thermal conductivity of about 0.25 watts / (meters Kelvin) can be increased to about 2 to 30 watts / (meters Kelvin).

In the 3 and 4 is the collector box 2 shown in different views. The collection box 2 can, for example, by injection molding or gas injection molding, in several parts, in particular in two parts, be formed of two half-shells. The two half-shells are then welded. The interior of the collecting tank 2 is in 4 With 22 designated. The collection box interior 22 is from a first collection box wall 23 and a second header wall 24 limited.

The two collection box walls 23 . 24 can also be called half-shells. The collection box wall 23 is integral with the bottom of the header tank 2 connected. The bottom of the collecting tank 2 has a plurality of parallel slots or through holes 25 on. The through hole 25 is from a peripheral edge 26 limited, the stuck when the pipe 10 makes a stop. The peripheral edge 26 that's the through hole 25 limited, in turn, is by a collar 28 edged at right angles from the collection box wall 23 projects.

The pipe 10 includes a pipe wall 31 , which has the shape of a slot in cross-section and flush with the peripheral edge 26 of the through hole 25 is applied. The thickness of the pipe wall 31 corresponds to the extent of the peripheral edge 26 from the collar 28 inside. The pipe height of the pipe 10 is in 4 With 34 designated. The through hole 25 has an elongate cross-section which corresponds to the cross section of the pipe wall 31 inside corresponds. Therefore, the through hole becomes 26 also referred to as a slot. Through the through hole 26 becomes a connection between the collection box interior 22 and the pipe interior 32 created.

The longitudinal axis of the through holes or slots 25 corresponds to the depth direction 15 of the heat exchanger 1 , The collar 28 grasp the pipes 10 at the ends of these, after these in the collar 28 on stop peripheral edge 26 were plugged. The collar 28 is welded after insertion with the associated pipe end, for example by Heizformelemente, laser welding or irradiation laser welding or vibration welding. Optionally, the components to be welded are simultaneously pressed together or pinched. The collar 28 can be provided with an insertion bevel for the tube ends to facilitate the insertion of the tubes.

In 5 is a pipe 40 shown as a flat tube with a pipe wall 41 is executed, which has the shape of a slot in cross section. The pipe wall 41 has in cross-section the shape of a rectangle whose short sides are designed as semicircles. By a double arrow 42 is the channel height in the pipe 40 indicated. Inside the tube 40 three bridges extend 43 . 44 . 45 perpendicular to the longitudinal sides of the flat tube and divide this into four channels 46 . 47 . 48 . 49 , which have approximately the same cross-section.

The pipe 40 with the jetties 43 to 45 is preferably produced by extrusion. The bridges 43 to 45 ensure sufficient rigidity of the flat tube during installation of the heat exchanger and during operation 40 or the heat exchanger block with such flat tubes. The bridges 43 to 45 prevent in particular an undesirable dip of the tube 40 on the long sides of the rectangular cross-section. In addition, through the bars 43 to 45 to a small extent the heat transfer on the inside of the pipe 40 improved.

Alternatively, instead of the flat tubes 40 Circular tubes are used, which have a round or oval cross-section. The round tubes can also be provided with webs. In the depth direction 15 of the heat exchanger 1 can also be arranged several round tubes.

In 6 is a flat tube 50 perspective shown, the flat tube 40 out 5 similar. In contrast to the previous embodiment, the flat tube 50 side elevations 51 . 52 or thickenings, which serve to fix guide elements in a heat exchanger block. Alternatively or additionally, the flat tubes 40 ; 50 also be provided with a roughness or ribbing, the depth direction 15 of the heat exchanger 1 runs. The roughness or ribbing in the depth direction is preferred by extrusion during manufacture of the flat tubes 40 ; 50 generated.

The guiding elements 13 . 14 serve to heat transfer surface on the outside of the tubes 10 to 12 to increase, reducing the efficiency of the heat exchanger 1 can be significantly increased. The guiding elements 13 . 14 can, like conventional corrugated ribs are rolled longitudinally with rolling rolls. The corrugated ribs are preferably formed from a multi-folded or shirred thin sheet metal material.

In 7 is a guide element in the form of a corrugated fin 55 shown in perspective. The corrugated rib 55 is in a known manner from a strip-like sheet material 56 bent zigzag. By a double arrow 57 a bend or kink is indicated. The corrugated rib 55 includes at each of the kink or bend an opening 58 , which is penetrated during assembly of the corrugated fin of the abutting plastic material of the respective tube. For this purpose, the plastic material from which the tubes are formed is heated prior to or during assembly of the corrugated fins.

The opening 58 becomes at the kink or bending point of the corrugated fin 50 formed by two tabs or rags 59 . 60 at the kink or bending point of the sheet metal material 56 be bent out. The tabs or rags 59 . 60 are preferably bent out towards the tube, so that they at least partially penetrate during assembly of the corrugated fin in the plastic material from which the tubes are formed.

In 9 is a corrugated rib 80 shown with an additional ribbing 81 to 83 is provided. The additional ribs 81 . 82 . 83 , which are bent out of the sheet metal material, are also referred to as gills.

In 8th is a section of a heat exchanger according to another embodiment with pipes 71 . 72 and corrugated ribs 74 . 75 shown. The corrugated ribs 74 . 75 are modified so that in the front and / or rear area in the depth direction 15 the heat exchanger at the bending or kinking sections or areas 77 the corrugated rib 74 bent upwards or downwards after the corrugated fins 74 . 75 slotted in these areas. In this embodiment can be based on the pre 7 described rag or tabs 59 . 60 be waived.

In the 10 and 11 is a corrugated rib 100 shown in different views. The corrugated rib 100 comprises, viewed in cross-section, two long legs 101 . 102 which are arranged at one end relatively close to each other. The other two ends are through a short leg 104 connected with each other. The long thigh 102 go at his the short thigh 104 turned away end in another short leg 105 above. By a double arrow 108 is the extension of the corrugated rib 100 in the depth direction 15 of the heat exchanger 1 indicated.

The corrugated rib 100 includes in the area of short thighs 104 . 105 a plurality of equally spaced openings 110 or through-holes that allow the passage of plastic material when the corrugated fin 100 is pressed during assembly against a preferably heated plastic tube. The openings 100 are preferably from a wreath 112 edged, which can be carried out continuously.

At the in 11 illustrated embodiment is the wreath 112 but in several wreath segments 114 . 115 divided. The wreaths 112 preferably extend outwards, that is to the respective pipe. Alternatively, the wreaths can also be directed inwards. The wreaths 112 can advantageously be oblique to the corrugated fin 100 be hired so that the wreath 112 and the corrugated rib 100 are arranged at an angle of about 45 degrees to 135 degrees to each other.

In 12 is a heat exchanger 121 according to a further embodiment, which corresponds to the in 1 illustrated embodiment is similar. To designate the same parts, the same reference numerals are used. To avoid repetition, the preceding description of the 1 directed. In the following, the differences between the individual embodiments will be discussed.

The in 12 illustrated heat exchanger 121 includes a heat exchanger 128 with pipes 131 . 132 , which are designed as flat tubes. Between two of the pipes 131 . 132 of which in 12 only two are provided with a reference numeral, is in each case a guide element 134 . 135 arranged.

In the 13 and 14 is the guiding element 135 shown in different views. The guiding element 135 is as a metal strip 140 with a variety of slots 141 . 142 . 143 executed. Through the slots 141 to 143 resembles the guide element 135 a comb. The slots 141 to 143 each serve to hold one of the flat tubes 131 . 132 ,

In 14 you can see that the border of the slots can be bent out to indentations 145 form, which come to the respective pipes to the plant. Furthermore, in the region of the slots insertion bevels 156 be provided, which facilitate the insertion of the tubes into the slots. The shape of the slots 141 to 143 is preferably to the shape of the tubes 131 . 132 customized. The metal strips 140 Overall, they are about as wide and as deep as the heat exchanger 1 ,

In 14 is in places 151 . 152 indicated that the indents 145 and insertion bevels 146 can be folded in an advantageous manner after joining with the pipe so that a subsequent release of the metal strip 140 prevented by the pipe.

The metal strips 140 In addition, surface-enlarging and / or heat-transfer-increasing profilings, such as knobs or ribs / gills, may also be used as spacers of the metal strips 140 can serve each other.

The assembly of the heat exchangers 1 ; 121 is preferably carried out as follows: First, the tubes, in particular flat tubes, 10 to 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 coffered. Then the collection boxes 2 . 3 positioned in the immediate vicinity of the flat tubes. Then the guide devices or guide elements 13 . 14 ; 134 . 135 brought in. If the vanes as corrugated ribs 55 ; 74 . 75 ; 80 ; 100 are executed, then these corrugated fins are placed between the tubes. Previously, the tubes can be heated by means of hot plates.

Subsequently, the thus formed heat exchanger block in the width direction 16 pressed. The corrugated ribs are connected to the pipes. When connecting, the flaps formed on the corrugated ribs penetrate 59 . 60 or wreaths 112 in the pipe wall, which leads to an improvement in the fixation and an improvement in the thermal conductivity.

The through holes 110 in the corrugated ribs 100 moreover provide the advantage that the heated plastic material the corrugated fin 100 permeates and runs behind. As a result, a hooking or a positive connection between the corrugated fin 100 and the associated pipe allows.

At the in 8th illustrated embodiment, the up / down bent areas or sections provide 77 for the necessary hold between corrugated rib 74 . 75 and pipe 71 . 72 , It is also possible to use conventional corrugated fins glued to the plastic pipes and / or in the width direction 16 of the heat exchanger are pressed hot.

Also in the in the 12 to 14 illustrated embodiment of the guide elements 134 . 135 as a metal strip 140 it is helpful to the pipes 131 . 132 to warm up first. This ensures that the metal strips 140 in the area of the slots 141 to 143 partially penetrate into the pipe walls. In the execution of the guide elements 134 . 135 as slotted metal strips 140 may be a pressing of the heat exchanger block in the width direction 16 omitted.

The connection between the plastic pipes 10 to 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 with the collection boxes 2 . 3 is preferably initiated by heating the partners to be joined. The heating takes place for example via Heizformelemente. After joining, the joining partners at the joint in the warm state with each other in height and / or width and / or depth direction 17 . 15 . 16 of the heat exchanger are pressed or squeezed. Welding of the joining partners, for example by means of transmission laser welding, or gluing is also possible. For welding the joining partners in addition to the Heizelementschweißen also Gaskonvektionsheizelementschweißen, ultrasonic welding, vibration welding or laser welding can be applied.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3733866 A1 [0002]
• - DE 4244017 A1 [0002]
• DE 10020798 A1 [0002]
• - DE 4411745 C1 [0002]
• DE 102005050293 A1 [0002]
• - DE 4229393 A1 [0002]
• - DE 4238742 A1 [0002]
• - DE 4338959 A1 [0002]
• DE 19543740 A1 [0002]

Claims (15)

Crossflow heat exchanger ( 1 ; 121 ) for a motor vehicle, with pipes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ), which flows through a medium and are flowed around by another medium, with at least one collecting box ( 2 . 3 ) into which the pipes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ) and with guiding elements ( 13 . 14 ; 134 . 135 ) between the pipes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ) are arranged, characterized in that the collecting box ( 2 . 3 ) and the pipes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ) made of plastic and the guide elements 13 . 14 ; 134 . 135 ) are formed of metal. Cross-flow heat exchanger according to claim 1, characterized in that the tubes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ) made of plastic with the collecting box ( 2 . 3 ) are welded from plastic. Cross-flow heat exchanger according to one of the preceding claims, characterized in that the tubes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ) and / or the collecting box ( 2 . 3 ) are formed from at least one plastic of the following group: chlorinated polyethylene (PE), polypropylene (PP), polyvinylidene fluoride (PVDF), polyphenylene oxides (PPO), polyetherimides (PI), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), polyphenylene sulfide (PPS ), Self-reinforcing polymer (SRF), polyaryletherketone (PEEK), polytetrafluoroethylene (PTFE), silane-modified and / or cross-linked polypropylene (PP), silane-modified and / or cross-linked high density polyethylene (PE-HD), perfluoroalkoxy Copolymer (PFA), polyphthalamide (PPA), polyamide (PA XXX), polysulfun (PSF), polyimide (PI). Cross-flow heat exchanger according to one of the preceding claims, characterized in that the tubes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ) are formed from a plastic which is filled with heat-conductive fillers. Cross-flow heat exchanger according to one of the preceding claims, characterized in that the collecting box ( 2 . 3 ) a bottom with through holes ( 25 ) whose peripheral edge ( 26 ) a stop for the pipes ( 10 ). Cross-flow heat exchanger according to the preceding claim, characterized in that the peripheral edge ( 26 ) by a circumferential collar ( 28 ), in which the tubes ( 10 ) are inserted with their ends. Cross-flow heat exchanger according to the preceding claim, characterized in that the collars ( 28 ) are welded to the pipe ends. Cross-flow heat exchanger according to one of the preceding claims, characterized in that the tubes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ) are designed as flat tubes. Cross-flow heat exchanger according to the preceding claim, characterized in that the flat tubes, seen in cross-section, side elevations ( 51 . 52 ) exhibit. Cross-flow heat exchanger according to one of the preceding claims, characterized in that the tubes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ) are extruded. Cross-flow heat exchanger according to one of the preceding claims, characterized in that the tubes ( 40 ; 50 ) at least one inner web ( 43 - 35 ) exhibit. Cross-flow heat exchanger according to one of the preceding claims, characterized in that the tubes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ) in a form-fitting manner with the guide elements ( 13 . 14 ; 134 . 135 ) and / or partially of the plastic material of the tubes ( 10 - 12 ; 40 ; 50 ; 71 . 72 ; 131 . 132 ) are surrounded. Cross-flow heat exchanger according to one of the preceding claims, characterized in that the guide elements ( 13 . 14 ) as corrugated ribs ( 55 ; 74 . 75 ; 80 ; 100 ) are executed with bending or kinking. Cross-flow heat exchanger according to the preceding claim, characterized in that in the region of the bending or bending points in each case at least one tab ( 59 . 60 ) from the corrugated rib ( 55 ), which is at least partially disposed in the associated pipe. Cross-flow heat exchanger according to claim 13 or 14, characterized in that in the region of the bending or bending points in each case at least one opening ( 110 ) is provided, which is penetrated by the pipe material.