DE4108763A1 - Radiator for room heating - has double-walled sections, with inner wall of material inert to fluid heat carrier - Google Patents

Abstract

The radiator is for heating of a room, using a heat-transmitting fluid heat carrier, esp. water or water steam. This is passed through radiator sections, the outer surface of which is in heat exchange withthe ambient air. The radiator sections (2) and/or their associated tubes (4), are double-walled. The inner wall (22) of each section engages flat over the facing outer wall surface (24). Intakes and outlets (34) are connected to the inner wall. The material of the inner wall is inert to corrosion by the heat carrier fluid, and is different from the material of the outer radiator wall. USE - Radiator for heating room.

Description

Radiators for room temperature control are used for the building tongue used. The material of such radiators is according to Ge aspects such as deformability and reasonable raw material and Processing price selected. Modern radiators exist too taking aluminum or an aluminum alloy, e.g. B. AlMgSi 0.5. In addition, radiators made of iron or an iron alloy used. Unless you're knocking out most want to apply for corrosion-resistant steel often there is a risk that the led in the radiators Heat transfer fluid gradually turns the radiator from in destroyed by corrosion.

The risk of corrosion of iron or iron alloys no oxygen is required in the heat exchange fluid ren explanation. But also in the case of aluminum and aluminum alloys pose a significant risk of corrosion Formation of AlOH or in special cases also other aluminum compounds bonds. Based on the particularly common case that as heat-emitting heat transfer fluid water or water vapor Ver it can be assumed that a residual salary of 0.5 to 1 mg / l of oxygen in water or water vapor too is still relatively harmless in continuous operation. However, there is a number of cases in which this oxygen content be pregnancy is permanently exceeded. The applies trivially z. B. when the radiator in a custom was circuit is switched on. Kick to a lesser extent comparable effects when an installer in faster time sequence in a closed heating water  or heating steam cycle through the heating fluid again and again Domestic water filling renewed. In other cases, a ge closed heat transfer fluid circuit have a leak, through the constant oxygen coming in from the surrounding atmosphere infiltrates the heat transfer fluid circuit. Finally it comes also before that in a closed heat transfer fluid circuit Sections are built in where oxygen is immediate can diffuse slowly through the material used, especially when using certain plastics.

An installa maintains the explained risk of oxidation counteract expensive by being in a closed Heat transfer fluid circuit adds oxygen-binding agents, as a precaution mostly in excess. The excess of such oxygen scavenger can very easily adjust the pH of the Heat transfer fluids in a closed circuit for continuous operation limit values of 9 and more rose in the alkaline range sen, so that it now becomes corrosive reaction products between the material of the radiator and excessively added Chemicals is coming. The reaction products can, depending on the type the chemical additive may be different. The effect Such damage is dangerous for the person skilled in the art who Heating system installed, unpredictable, since he the Does not know the practice of the respective installer. Similar un Foreseeable damage hazards exist when connecting the Ra diators to a district heating system, as experience has shown wise foreign chemicals can immigrate, which then also in the duration operation are harmful. Except in the district heating system added chemicals also come with decomposition products in the piping system in question.

Also with heat transfer fluids other than water or Water vapor can lead to corrosion problems.

As can be seen from the above cases, the mate are materials that are normally used as material for radiators used, not at the same time optimally as corrosion-proof mate rialien selectable, if you can taste one of them pregnant case of the use of stainless steel or corrosion-proof  most chromium / nickel steels, which moreover also processing require additional effort.

One has already thought of the inner surface ter radiators, e.g. B. made of aluminum or an aluminum alloy anodizing. However, there are difficult to manage technical problems arise.

The invention has for its object a Ra diator for room temperature control using a heat-dissipating heat Meträgerfluids, especially water or steam, under Use of those commonly used for radiator construction To create materials that are also reliable on the inside against corrosive influences of the type of heat mentioned gerfluids is protected on the usual materials.

This task is done with a radiator according to the waiter concept of claim 1 by its characteristic features ge solves.

The preamble of claim 1 relates to the usual design of a radiator with inlets and outlets for the heat transfer fluid and at least one radiator section, which is the heat exchange between the heat exchange fluid and the Ambient air causes.

In the radiator according to the invention, only one Au outer wall area of the heat-exchanging radiator section made of common material, while an In nenwand is drawn in, the against corrosion of the heat transfer fluid resistant material or ent is pretreated speaking. For the inner wall and the outer wall metallic materials are appropriately used. By two-dimensional connection between the outer and inner wall of the respective Towards the radiator section, their thermal conductivity is little affected flows, especially if you choose metals for the inner wall, which are good heat conductors. Also there is none for the inner wall large wall thickness required, and you can see the overall design so that the inner and outer wall together, so not only the outer wall, giving the required static strength. By the respective inner wall to the inflows and outflows  is closed, you can in the entire area of the radiator the heat transfer fluid flow-guiding areas corrosive train onsfest. A flow-carrying connection of the inlet and Processes on the usual material of radiators is ver avoided. One can also use a mechanical connection entirely between the inlets and outlets and the outer wall area of the respective radiator.

Under the inner and outer wall of the radiator section whose tubular heat conducting fluid is indicated spoke. A heat exchange ribbing of the outer wall can additionally be present, be it integral with the outer wall, be it thermally connected with this as a separate construction part the.

In principle it is possible that the inner wall of the Radia tors and the inflows and outflows from different, but each because of the heat exchange fluid corrosion-resistant material exist as long as the parts mentioned close together can close. Incoming and outgoing flows are preferred, however like the inner wall of the respective radiator section from the same Material chosen.

The invention also includes such radiators the only one heat transfer effective radiator section have. In particular, however, the invention is concerned with those radiators in which several radiator sections in Re are arranged in a grid arrangement. Construction is particularly important art according to claim 4 with manifolds considered without but the known design with connecting elbows want to exclude.

The invention is concerned with the preferred How to manufacture the double-walled radiator sections Lich with such radiator sections that run in a straight line. However, the invention also specifies a production process in which using the centrifugal force of an expanding tool an expansion intervention was carried out in such radiator sections can be, to some extent, in relation to one straight axis is curved. Straight radia  Gate sections are therefore only a preferred special case.

Two preferred types of radia according to the invention gates, whose outer geometry is known per se, show the Claims 6 and 7.

The invention also includes non-circular cross-sections, e.g. B. oval cross sections, of the inner wall and outer wall of the Radia tors and also gives a possible manufacturing process other. However, an axial symmetry of at least is preferred Inner wall and outer wall in the sense of claim 8, on the too the other manufacturing method according to the invention, which one Expansion using a rotating tool under fleeing force affects, is turned off.

The last mentioned manufacturing process also possible the geometry of a radiator according to claim 9. In contrast to an also conceivable axial profiling acts a profiling that, as here, predominantly in the circumferential direction runs, on the flow of the heat transfer fluid turbulence convincing and thus improves the heat transfer property For radiators, which are essentially in the extrusion process are produced, one has such a turbulence intensifier not be able to produce any profile at all.

Otherwise you can the additional wall thickness of the inner wall provided according to the invention in many cases by reducing the wall thickness of the outer wall of the respective Ra fully or partially compensate for the diameters section by clicking on static strength now eliminates the double wall formation. Then turbulence generation becomes all the more effective.

In other cases, one is more concerned with one if possible undisturbed flow of the pressure fluid through the radiator, for example when adapting the flow resistance to predetermined circulation pump. Then an internally smooth formation according to claim 10 prefers.

The features of claim 11 promote the connection Possibility of the radiator section at the respective inlet and outlet run.  

The intimate warmth sought after the invention ting connection of the inner wall and outer wall of the respective Ra diator section can also on the external appearance and the corresponding material deformation lines in cross section according to Claim 12 become clear.

Claims 13 and 14 give preferred material selection and wall thicknesses.

A radiator according to the invention is conceivable by shrinking the later outer wall onto the later In to produce the inner wall. However, this is already from the energy expenditure very expensive. Experience also shows that there are radiators share how you used to use them as radiator sections has applied, with manufacturing tolerances in view out of roundness. Such out-of-roundness can lead to it major errors in the conduction that interfere with heat conduction between the outer wall and the inner wall in the shrinking process lead.

According to claim 15 according to the invention is preferred therefore an expansion of the later inner wall initially loosely inserted part to the if necessary co-deforming part serving as an outer radial abutment, which forms the later outer wall of the radiator section. It it is conceivable to use pressure pads to expand a fluid use. However, mechanical expansion is preferred by mechanical pressing according to claim 16.

Claims 17 and 18 give in this connection two alternative approaches again, the first of which (Claim 17) the known in another context wide technology by means of expanding mandrel and the second In contrast, a dynamic method with Exploiting the centrifugal force of a loosely inserted rotating Has work tools on the subject. The former method is particularly suitable for the production of non-round configurations tion of the radiator section or its walls and wall surfaces chen. The second method, on the other hand, enables Manufacturing-related out-of-roundness otherwise essentially cylin  electrical cable cross-sections using radial loading to compensate for the movement of a working tool under centrifugal force Chen that even with such tolerances an optimal flat and good heat-conducting connection between the inner wall and the outside wall of the radiator section. At the same time, the last one opens mentioned method the possibility that mentioned in claim 9 turbulence-generating profiles on the flow-carrying To generate the inner surface of the inner wall of the radiator section. There at you can create a helical profile in one step or reach several helical profiles running in parallel. With multiple operations, you can even create such profiles generate which intersect, be it with different ones Incline of the helical profiles with the same direction of rotation of the working tool during manufacture, be it against common, in the limit case absolutely the same, incline angle different direction of rotation of the work tool during the Manufacturing. The profiles are essentially memorized gene in the inner surface of the inner wall of the radiator section, wherein lead-like structures stand between these impressions ben or even bulged inward by material displacement will. Claim 21 specifies preferred operating conditions in the frame of which is more or less practical stone angle of the helical profile (s) with the opening bring the necessary centrifugal force of the work tool ver can be united; because the centrifugal force must be so great be that they always reliably the required contact pressure the inner wall to the outer wall of the radiator sec guaranteed. Especially if no such profiling trained on the inner surface of the inner wall of the radiator section other operating conditions also come into play Question.

The manufacturing method of claim 22 relates on the manufacture of a radiator according to claim 10. Das Manufacturing method according to claim 23 relates to the Manufacture of a radiator according to claim 11.

The device according to claims 24 to 27 relates  on the execution of the alternative of the invention The method according to claim 18. As an active expansion part on the ar beitskopf used appropriately according to claim 25 Rolling elements. Depending on the type of rolling element according to claim 26 or 27, or comparable rolling elements, can be either in NEN unprofiled radiators according to claim 10 in the process rensführung according to claim 22 or internally profiled radiators according to claim 9 in the process according to claim 20 put.

Except for the entire radiator with inlets and outlets the invention also the individual, in the field of leadership of the Heat transfer fluid double-walled radiator section, such as it in particular by the method according to the invention and with the device according to the invention can be produced.

The invention will now be described more schematically Drawings on several embodiments explained in more detail tert. It shows

Fig. 1 is a partially sectioned side view egg ner first embodiment of a radiator according to the invention;

Fig. 2 is a partially sectioned side view egg ner second embodiment of a radiator according to the invention;

. Fig. 3 is an end view of a possible in the radiators of Figs 1 and 2-dimensional form of radiator section;

FIG. 4 shows a detailed partial view of the double-walled region of a radiator section that supplies the heat-transfer fluid of the radiator, only for example that of FIG. 3, in an end view with a section through the inner wall on the end face of the outer wall;

Fig. 5 is a function diagram of a first execution of a device according to the invention;

Figure 5a is a radial section through the doppelwandi gen tubular portion of a radiator section, as it is produced by means of a device according to the type of Fig. 5.

Fig. 6 is a functional sketch of a second embodiment of a device according to the invention;

Fig. 7 is a functional sketch of a third embodiment of an inventive device and

Fig. 7a is an end view of the double-walled Rohrbe area of a radiator section, as can be produced with the device according to Fig. 7.

Figs. 1 and 2 show two prototypes of radiato ren in register arrangement. Here, two, three or more radiator sections 2 run parallel to each other, mostly in the assembly stand with vertical alignment of the axes A of their respective conduit 4 , which can be flowed through by a heat-transferring heat transfer fluid, in particular water or water vapor.

Without restricting generality, the radiator section 2 can have the profile whose geometry is shown in FIG. 3. This profile goes back to Fig. 4 of the German patent P 32 29 757.2-09. Here, the conduit 4 is provided with a heat-conductive ribbing in the form of webs or ribs which are integrally manufactured with the conduit 4 ge. The entire radiator section is an extruded part. The webs form a flat front plate 6 extending along one side of the conduit 4 . This is rectangular in plan view and connected along its vertical imaginary with bisecting B via a web approach 8 with the outer man telfläche the conduit 4 . The heat-conducting ribbing has, in addition to the front plate 6 and the web set 8 , a web arrangement 10 which is open on the plate 6 facing away from the front side of the conduit 4 . Since at extends along an imaginary plane C, which is arranged at a right angle to the plane of the front plate 6 and intersects the center line of symmetry B of plate 6 and at the same time represents the imaginary central plane of the web approach 8 , a straight central web 12 , which on the web approach 8 starts on the opposite side of the conduit 4 from its outer surface and thus emerges directly from the conduit 4 . Two straight side webs 14 and 16 each extend on both sides of the central web 12 parallel to the sem and at equal distances from one another, the distances between the side surfaces facing one another being measured. The free ends 18 of the central web 12 and the side webs 14 and 16 lie in a common plane, which describes the back of the open web arrangement.

The opposite ends of the side webs 14 and 16 go substantially at right angles into an intermediate web 20 which extends in a straight line parallel to the front plate 6 with From this extends and res on both sides of the Rohrroh res 4 starts from this. The respective lateral extension of the intermediate webs 20 is somewhat less than that of the front plate 6 , so that it optically covers the ribbing. The pipe 4 is closer to the front panel 6 than on the imaginary plane through the free ends 18 of the rear open Stegan arrangement. As made clear in Fig. 3, the strengths of the ribs are different, sometimes graded, chosen, in addition to static aspects, in particular aspects of optimal heat conductivity from the conduit 4 are taken into account in all effective surfaces of the ribs acted upon by the ambient air.

As illustrated in the drawing out of the detail of Fig. 4, the radiator section 2 of FIG. 3, the Lei tung pipe of the respective radiator section 2 forms a double-walled out, with an inner wall 22 and an outer wall 24. The outer wall 24 is prefabricated integrally with the entire ribbing of the webs 6 , 8 , 20 and 12 , 14 and 16 , as is also shown in FIG. 4 of the aforementioned German patent 32 29 757.

The inner wall 22 is a subsequently inserted into the outer wall 24 tube, which in turn is used for directing the heat-emitting heat transfer fluid. The inner wall 22 lies over the entire surface on the inner surface of the outer wall 24 , so that optimal radial heat transfer from inside to outside is ensured over all surface areas of the conduit 4 of the radiator section 2 concerned.

The configuration according to FIGS. 3 and 4 represents a preferred geometric shape among the possible configurations of a radiator section 2 .

In the radiators of Figs. 1 and 2 in Registeranord voltage cover the front panels 6 of the individual functions Radiatorsek 2, both the conduit 4 as well as the whole web arrangement. The upper and lower edges (not shown in FIG. 1) of the individual front plates 6 are each aligned in the horizontal direction. The radiator sections 2 are mechanically united to the radiator by means not shown. In each case, a small vertical longitudinal gap 28 remains between the individual front plates 6 .

Above and below, the extension of the respective conduit 4 is cut back relative to the vertical extension of the associated front plate 6 so that in the cut back area inlets and outlets for the heat transfer fluid can be arranged. The Steganord voltage is fully or partially cut back or tunnelled in the transverse direction. In the specific embodiments of FIGS. 1 and 2, the outer walls 24 of the conduit 4 and the webs 8 , 20 and 12 , 14 and 16 are the same at the end face when cutting back in the axial direction, if necessary while simplifying a specifically more complicated cut-back situation, since they have a common level or lower end face. This can be seen in relation to the inner wall 22 and the intermediate webs 20 of the web arrangement 10 in FIGS . 1 and 2 and, with regard to the other webs 12 , 14 and 16 and 8 of the web arrangement 10 , is to be thought of as supplemented. The cut back end faces 30 are horizontally aligned with neighboring radiator sections 2 .

In the embodiment according to FIG. 1, only the upper area of the radiator is shown; the lower area is designed in the same way.

It can be seen that both in the embodiment of a radiator according to FIG. 1 and in the embodiment according to FIG. 2, the respective inner walls 22 of the conduit 4 project axially beyond the outer walls 24 and the adjoining end face 30 of the ribbing. The respective supernatant 32 is used for the fluidic connection of the conduits 4 of the ra diator sectors 2 with the respective inlet and outlet for the heat-emitting heat transfer fluid.

In the radiator of Fig. 1, the conduits 4 are connected in parallel to each other at their two ends to a Sam melrohr 34 communicating, which forms the inflow and outflow for the heat transfer fluid and this in the concrete exemplary embodiment from FIG. 1 at one end is provided with a connection screw thread 36 . The respective manifold 34 extends parallel to the upper edges and the Unterkan th 26 of the front panels 6 somewhat below and below, somewhat above their level. The respective manifold 34 has circumferential bores 38 in its jacket, each of which leads the pipe 4 to each radiator section 2 . In order to start bores 38 , the free end 40 of the overhang 32 of the inner wall 22 of the respective conduit 4 of the associated radiator section 2 is inserted in a sealed manner. Seals of the usual type such as with separate sealants or by soldering, welding and. Like. Be provided. Likewise, one could use other connection methods, such as with connecting flanges, socket connections and the like. Like., Provide.

Specifically, a socket connection is provided in the alternative radiator shown in FIG. 2. In this radiator, the manifolds 34 of Fig. 1 are replaced by elbows 42 , which are also arranged in a cut-back area behind the front panels 6 of the radiator sections 2 and with outer sleeves 44 each adjacent projections 32 of the respective inner walls 22 of the conduits 4 adjacent Radiatorsek tions spread. In this arrangement with manifolds, in contrast to the parallel connection of the flow according to FIG. 1, the individual radiator sections are now connected in series. It is understood that between the connections of the protrusions 32 to the elbows, other conventional sealing means can also be provided. The other geometry of the radiator according to FIG. 2 is the same as for the radiator according to FIG. 1.

The Figs. 5 to 7 illustrate only the Grundprin zip of devices according to the invention, with which each one of a radiation section 2 can be pressed loosely with a sliding fit in the outer wall 24 inserted inside wall 22 to the outer wall 24 of the double-walled conduit pipe 4.

With reference to Fig. 7a it is first clarified that the cross section of a pipe 4 produced can also deviate from the usual circular configuration, for. B. can be oval as shown. The double wall obtained is not particularly shown in FIG. 7a.

For this purpose, the part forming the inner wall 22 into the part serving as a radial abutment, namely the outer wall 24 , can first be inserted with a slight radial undersize and then expanded radially against the outer wall 24 by an expanding mandrel 46 which has a conical head part 48 will. Here, the expanding mandrel 46 has approximately radial undersize with respect to the radial internal dimension, the initially loose in the outer wall 24 inserted inner wall with such a dimensioning that after expansion the outer surface of the inner wall 22 is pressed over the entire surface of the inner surface of the outer wall 24 . The expanding mandrel is pulled out of the inner wall 22 after expanding.

In the described method of operation, the expanding mandrel also has the cross section of the pipe 4 to be produced , in the case of the configuration according to FIG. 7 a therefore also an oval cross section.

You can also manufacture circular configurations of the conduit 4 by means of this procedure. It has been shown, however, that just prefabricated outer walls 24 of conduits 4 of radiator sections turn out to be significantly out of round, the tolerance fluctuations not permitting an adapted use of expanding mandrels 46 with the desired adaptability to the out-of-roundness. The operation of FIGS. 5 and 6, by contrast just placed on the balance of such roundness.

In this mode of operation, an expediently only one-sided rotatable expanding mandrel 50 has a working head 52 which is inserted along the axis D into the assembled assembly of inner wall 22 and outer wall 24 with helical movement, that is to say simultaneously feed and rotation, and thereby under centrifugal force of the working head when rotating against the inner wall 22 and to which the nending outer wall 24 is pressed as an abutment.

If, in accordance with FIG. 6, a rolling element in the form of an axially parallel roller 54 is provided on the working head 52 , it maintains a uniform, non-profiled surface of the inner surface of the inner wall 22 of the conduit 4 facing the heat exchange fluid.

If, instead of the roller 54, a rolling element in the shape of a ball 56 is selected, an helical profile 58 is embossed instead into the inner surface of the inner wall 22 facing the heat transfer fluid. In Fig. 5 it is also made clear with the aid of two further balls 56 a and 56 b that several profiles with the same direction of rotation can also be produced simultaneously. Analogously, one could also see several rollers 54 in FIG. 6 for further smoothing the inner surface of the inner tube 22 .

Of Fig. 5a is finally made it clear that a deformation of the outer wall 24 results in the pressing together of inner wall 22 and outer wall 24 of each conduit 4 of a radiation section 2, which here as Außenpro fil 60 of the outer wall 24 opposite to represent the profile 58 poses.

The graphic representation of the functioning of the device according to the invention and the associated method is roughly schematic. For example, holding means for compressing the inner wall 22 and outer wall 24 of the respective conduit 4 are also not shown, as are drive means for the expanding mandrels 46 and 50 . While in example the expanding mandrel 46 can make do with a pure feed drive, the expanding mandrel 50 requires a combined feed and rotary drive.

Claims (27)

1. Radiator for room temperature control by means of a heat-transfer fluid, in particular water or water vapor, which is passed through inlets and outlets through at least one radiator section ( 2 ), the outer surface of which enters into heat exchange with the ambient air, characterized in that
that the radiator section (s) ( 2 ) or their respective conduit pipe ( 4 ) is (or are) double-walled,
that the inner wall ( 22 ) of the respective radiator section covers the inner wall of the outer wall ( 24 ) of the radiator section assigned to the inner wall,
that the inlets and outlets ( 34 ; 42 ) are connected to the inner wall ( 22 ) of the respective radiator section, and
that the material of the inner wall ( 22 ) of the respective Radiatorsek tion ( 2 ) inert to corrosion by the heat transfer fluid and different from the material of the outer wall ( 24 ) of the respective radiator section is selected. 2. Radiator according to claim 1, characterized in that the inlets and outlets ( 34 ; 42 ) consist of the same material as the inner wall ( 22 ) of the respective radiator section ( 2 ). 3. Radiator according to claim 1 or 2, characterized in that several radiator sections ( 2 ) are arranged in a register arrangement. 4. Radiator according to claim 3, characterized in that the inlets and outlets ( 34 ; 42 ) at the two ends of the respective radiator sections ( 2 ) are connected manifolds. 5. Radiator according to one of claims 1 to 4, characterized in that the radiator section (s) ( 2 ) runs straight ver (or run). 6. Radiator according to one of claims 1 to 5, characterized in that the outer wall ( 24 ) of the respective radiator section ( 2 ) has a cylindrical surface. 7. Radiator according to one of claims 1 to 5, characterized in that the outer wall ( 24 ) of the respective radiator section ( 2 ) with a heat exchange ribbing ( 6 , 8 , 20 , 12 , 14 , 16 ) is provided, preferably in training Outer wall together with the heat exchange ribbing as an extrusion extrusion ( Fig. 3). 8. Radiator according to one of claims 1 to 7, characterized in that the inner surface of the outer wall ( 24 ) and the inner wall ( 22 ) of the respective radiator section ( 2 ) extend cylindrically. 9. Radiator according to one of claims 1 to 8, characterized in that the inner surface of the inner wall ( 22 ) of the respective radiator section ( 2 ) with at least one wendelförmi gene profile ( 58 ) is provided, preferably in the case of several helical profiles at least cut two of them. 10. Radiator according to one of claims 1 to 8, characterized in that the inner surface of the inner wall ( 22 ) of the respective radiator section ( 2 ) is non-profiled. 11. Radiator according to one of claims 1 to 10, characterized in that the inner wall ( 22 ) of the respective radiator section ( 2 ) at least at one end, preferably at both ends, one over the end face ( 30 ) of the outer wall ( 24 ) same radiator section ( 2 ) forms excellent projection ( 32 ). 12. Radiator according to one of claims 1 to 11, characterized in that the inner wall ( 22 ) of the respective radiator section ( 2 ) is at least frictionally pressed onto the deformed outer wall ( 24 ) of the same radiator section, that the intimate heat at all occurring operating temperatures The areal adhesion of the inner tube to the outer tube of the respective radiator section remains. 13. Radiator according to one of claims 1 to 12, characterized in that the material of the outer wall ( 24 ) of the respective radiator section is aluminum or an aluminum alloy, preferably AlMgSi 0.5, or iron or an iron alloy, and that the material of the inner wall ( 22 ) of the respective radiator section is copper or a flexible copper alloy, preferably brass or a wrought copper alloy. 14. Radiator according to one of claims 1 to 13, characterized in that the wall thickness of the inner wall ( 22 ) of the respective radiator section is in the range from 0.3 to 1.0 mm, preferably from 0.4 to 0.6 mm, most preferably 0.5 mm. 15. A method for producing radiator sections, in particular a radiator according to one of claims 1 to 14, characterized in that an inner wall ( 22 ) of the radiator section ( 2 ) provided in a tube forming the outer wall ( 24 ) of the radiator section produced forming outer radial abutment is inserted axially and is pressed under radial expansion on the inner surface of the abutment. 16. The method according to claim 15, characterized in that is pressed mechanically. 17. The method according to claim 16, characterized in that the inner wall ( 22 ) of the radiator section formed, with a little radial undersize to sliding fit into the outer wall ( 24 ) of the radiator section ( 2 ) bil dende outer abutment axially inserted part of one with a slightly larger radial outer dimension than the inner dimension of this part provided inner abutment is expanded axially progressively, preferably with somewhat simultaneous radial deformation of the outer abutment. 18. The method according to claim 16, characterized in that the inner wall ( 22 ) of the radiator section ( 2 ) forming, with a little radial undersize to sliding fit into the outer wall ( 24 ) of the radiator section ( 2 ) formed outer abutment axially inserted part by means of a helically through the inserted part ( 22 ), the inner abutment ( 52 ) is progressively pressed under the centrifugal force of the helical movement of the inner abutment ( 24 ) onto the outer abutment, preferably with somewhat simultaneous radial deformation of the outer abutment . 19. The method according to claim 18, characterized in that the helical deformation of the inserted part ( 22 ) is carried out in several axially extending passages. 20. The method according to claim 18 or 19, characterized in that with at least one helical passage of the inner abutment ( 52 ) through the inserted part in the inner surface of the same helical profiles ( 58 ) are formed. 21. The method according to claim 20, characterized in that the helical passage of the inner abutment ( 52 ) with an axial feed in the range of 1 to 20 mm / revolution and at a speed of 20 to 500 revolutions / min is carried out. 22. The method according to claim 18 or 19, characterized in that the inner surface of the inserted part is left unpro filiert when passing through the inner abutment ( 52 ). 23. The method according to any one of claims 15 to 22, characterized in that the inserted part ( 22 ) is chosen with a greater axial length than the part serving as the outer abutment ( 24 ) and the insertion is preferably carried out so that the inserted part protrudes at both axial ends of the outer abutment. 24. Device for carrying out the method according to one of claims 18 to 23, characterized by an expanding mandrel ( 50 ) with a working head ( 52 ) which has a radial undersize in relation to the part forming the inner wall ( 22 ) of the radiator section produced before it Has widening on the outer wall ( 24 ) of the radiator section produced, by a drive for a helical feed of the expanding mandrel ( 50 ), and by such a bearing and such a feed of the expanding mandrel that its working head with its helical advance in the inserted part under the centrifugal force of the helical feed flies radially with such a strength that the inserted part ( 22 ) to the outer wall ( 24 ) of the radiator section forming outer abutment ger is pressed under the centrifugal force. 25. The device according to claim 24, characterized in that the working head ( 52 ) of the expanding mandrel ( 50 ) is provided with at least one radially projecting rolling element ( 54 ; 56 ) which comes into expanding engagement with the inserted part ( 22 ). 26. The apparatus according to claim 25, characterized in that the rolling body is an axially extending roller ( 54 ). 27. The apparatus according to claim 25, characterized in that the rolling body is a ball ( 60 ).