DE102012008183B4 - heat exchanger kit - Google Patents

Abstract

The present invention relates to a pipe section (12; 112; 212; 312) through which a heat transfer medium flows, a first and a second pipe (14, 16; 114,116; 214,216; 314,316) which are arranged concentrically and which are arranged between them forming an annular space (18; 118; 218; 318) for guiding the heat-absorbing medium, a first inlet (20; 120; 220; 320) and a first outlet (22; 122,222; 322) in the first tube (14; 114; 214; 314) for the heat-receiving medium, wherein the first inlet (20; 120; 220; 320) and the first outlet (22; 122,222; 322) communicate with the annulus (18; 118; 218; 318) in that the annular space (18; 118; 218; 318) and the first outlet (22; 122,222; 322) form a closed conduit system for the heat-absorbing medium, and deflection baffles (28; 128) which are located in the annular space (18 118; 218; 318), the first tube (14; 114; 214; 314) being closed at its front side only in the region of the annular space (18; 118; 218; d the first and second tubes (14, 16; 114, 116; 214, 216; 314, 316), the first inlet (20; 120; 220; 320) and the first outlet (22; 122; 222; 322) are designed as inserts in the pipe section (12; 112; 212; 312) through which the heat transfer medium flows ,

Description

The present invention relates to a heat exchanger kit for insertion into a pipe section through which a heat transfer medium flows.

Heat exchangers are used in a variety of applications and are for example in the documents DE 23 31 563 A . DE 25 43 326 A1 . DE 12 54 164 A and DE 22 37 430 A described.

It is known that, for example, in a central heating, the emitted into the environment flue gases still have a relatively high heat content. The temperatures of the flue gases may well be in the range of 250 ° C to 400 ° C. In general, this heat is released unused to the environment, which is extremely unsatisfactory.

Thus, attempts have already been made to use the exhaust heat of heating systems by means of heat exchangers.

The DE 28 20 577 A1 describes a heat exchanger in which the coming of a heating system return water is passed in a jacket helically around a flue pipe. By this device, it is possible to heat the coming out of the heating system return water.

The efficiency of this heat exchanger is not yet satisfactory. It is therefore desirable to further increase the efficiency of such a heat exchanger.

The DE 40 10 151 A1 describes an annular gap heat exchanger, which consists of four concentric tubes arranged one inside the other, so that between the individual tubes annular chambers / annular gaps arise, of which the inner tube chamber is flowed through by the heat-carrying medium and in countercurrent process, the two outer annular chambers are flowed through by the heat-absorbing medium , With this arrangement, the efficiency of the heat exchanger can be significantly increased.

For use in a smoke pipe / exhaust pipe, this device is less suitable because the heat-carrying medium is guided in an annular chamber / annular gap. If the flue gas were guided in the annular chamber / the annular gap, this would lead to a high flue gas resistance in an exhaust pipe. The consequence would be an impairment of the deduction of flue gases from the boiler in the chimney.

In the DE 10 2004 045 923 A1 a flow channel for a heat exchanger is described which has on opposite walls structural elements which serve to increase turbulence and vortex formation in order to increase the heat transfer capability of the heat exchanger.

The DE 41 32 439 A1 discloses a heat exchanger consisting of a central hollow tube and a jacket tube arranged concentrically therewith. Between the hollow tube and the jacket tube, a ring is arranged from a corrugated sheet whose corrugations are arranged in a star-shaped around the hollow tube. The corrugated ring increases the heat exchange surface.

It is an object of the present invention to provide a heat exchanger kit for insertion into a flowed through by a heat transfer tube section for heat recovery from exhaust gases or flue gases of a heating system, which has a high efficiency, does not significantly hinder the flue and is also inexpensive.

According to the invention the object is achieved by a heat exchanger kit for insertion into a flow-through of a heat pipe section consisting of a first and a second tube, which are arranged concentrically, wherein the tubes between them form an annular space for guiding the heat-absorbing medium, the first tube is sealed at its end faces in the region of the annular space and the second tube is open at its end faces, a first inlet and a first outlet in the first tube for the heat-absorbing medium, wherein the first inlet and the first outlet communicate with the annular space, so that the annular space, the first inlet and the first outlet form a closed conduit system for the heat-absorbing medium, and deflection baffles which are provided in the annular space and which guide the heat-absorbing medium helically through the annular space or several times in the longitudinal direction through the annular space.

In the heat exchanger kit according to the invention, the heat transfer medium in the pipe section flows around the outside of the first pipe and through the second pipe. The two concentrically arranged tubes offer only a comparatively low flow resistance for the heat transfer medium flowing through the tube section. The deflection baffles arranged in the annular space between the first and second tubes increase the residence time of the heat-absorbing medium in the tube section through which the heat-transfer medium flows, so that a comparatively high degree of efficiency is achieved.

The heat exchanger kit is relatively inexpensive in the flowed through by a heat transfer pipe section mounted on site. Installation becomes particularly simple if the heat exchanger kit and the pipe section are designed as a kit which can be inserted into a pipe.

According to the invention, the deflection baffles are designed to guide the heat-absorbing medium helically through the annulus or several times in the longitudinal direction through the annulus.

Here, in a preferred embodiment, the deflection baffles are designed as guide elements, which are guided in the axial direction of the first and second tube helically in the annular space. The guide elements are preferably plate-shaped made of metal, in particular of sheet metal, or plastic.

In an alternative preferred embodiment, the deflection baffles comprise a first and a second plate-shaped, aligned parallel to the tube axis guide member which is respectively secured to the first and second tube and at least one end face of the annulus, so that between the first and second tube, a first filling space is formed, wherein the first inlet in the first tube communicates with the first filling space and wherein on the first and / or second guide element, a first inner drain opening is provided. In this way it is possible to guide the heat-absorbing medium in segments along the first and second tubes and then again to steer longitudinally in the opposite direction to increase the residence time of the heat-absorbing medium in the annulus.

In this case, it is preferable for the first and / or the second guide element to be shorter than the first and second tube, so that the first inner drainage opening is formed as a gap between the end face of the annular space and the first and / or second guide element. In this way, the maximum possible distance along the annulus can be exploited to allow the highest possible residence time of the heat-absorbing medium in the annulus.

In an alternative embodiment, the first and second guide elements are each attached at its two ends in a sealing manner to the end face of the annular space, and the first inner drain opening is provided in the first and / or second guide element.

According to a preferred further connection, a third guide element is provided, which is attached to the first and second tube and at least one end face of the annulus to form a second filling space, wherein the first and second filling space communicate with each other by means of the first inner drain opening and wherein the second Filling space has a second inner drain opening.

As a result, an additional longitudinal flow of the heat-absorbing medium is achieved, thereby further increasing the residence time of the heat-absorbing medium in the annulus. The efficiency of the heat exchanger can thereby be further improved.

In order to further increase the efficiency of the heat exchanger, it is advantageous that a plurality of filling spaces is provided which communicate with each other.

Optimal guidance of the heat-absorbing medium can advantageously be achieved by providing successive inner drainage openings alternately at the two end faces of the annular space in the flow direction of the heat-absorbing medium.

In a preferred embodiment of the invention, the heat exchanger kit further comprises a third and fourth tube, which are concentrically arranged and form a second annulus, and a second inlet on the third tube and a second outlet on the fourth tube, wherein the first and second tube concentric are arranged in the third and fourth tube and the first annular space communicates with the second annular space and wherein the fourth tube is closed at its end sides in the region of the second annular space. As a result, for example, the heat-absorbing medium can be guided in the direction of the heat carrier and in the opposite direction of the heat carrier through the heat carrier. The thus prolonged residence time of the heat-absorbing medium in the heat carrier leads to an improved heat exchange between the heat transfer medium and the heat-absorbing medium. It is advantageous that deflection baffles are provided in the second annular space.

Advantageously, the deflection baffles are formed in the same manner as has been described in connection with the first annular space. That is, deflecting baffles can be provided, which result in the heat-absorbing medium being guided helically in the second annular space or alternatively several times along the axial direction of the second annular space.

In a preferred embodiment, it is provided that at least the end face of the first and / or second annular space facing the flow of the heat transfer medium is chamfered. In this way, the flow resistance be further reduced for the heat transfer, so that the influence of the heat exchanger kit on the heating operation can be further reduced.

To further optimize the heat transfer from the heat transfer medium to the heat-absorbing medium, it is advantageous that Wärmeleitbleche are provided in the space traversed by the heat transfer medium. The heat conducting plates can extend radially from an annular space in the space through which the heat transfer medium flows.

Additionally or alternatively, heat transfer plates may be provided in the annulus, which are attached to at least one of the tubes and project into the annulus. The heat transfer sheets are designed so that they do not significantly affect the flow of the heat-absorbing medium in the annulus.

Preferred embodiments of the present invention will be described in more detail in the accompanying drawings, in which:

1 a first embodiment of the invention in plan view,

2 a plan view according to a second embodiment of the invention,

3 in the 2 illustrated embodiment in perspective view,

4 A third embodiment of the present invention in plan view,

5 in the 4 illustrated embodiment in cross section,

6 A fourth embodiment of the present invention in plan view,

7 in the 6 illustrated embodiment in cross section.

1 shows a first embodiment of a heat exchanger 10 comprising a pipe section through which a heat transfer medium flows 12 , a first pipe 14 and a second tube 16 , The first pipe 14 and the second tube 16 are arranged concentrically and form an annulus between them 18 to guide a heat-absorbing medium. The first pipe 14 has an inlet 20 and a process 22 on. The feed 20 , the annulus 18 and the process 22 communicate with each other, leaving the annulus 18 , the feed 20 and the process 22 form a closed conduit system for the heat-absorbing medium. In the pipe section 12 are openings 24 . 26 formed by the inflow 20 or the process 22 protrudes. The feed 20 and the process 22 are designed as pipelines.

The first pipe 14 is in the section between the first pipe 14 and the second tube 16 that is in the area of the annulus 18 closed at its ends. The second tube 16 is open at its front.

The feed 20 is on the lateral surface of the first tube 14 at an upper end portion of the pipe 14 and the process 22 on the opposite side of the tube on the lateral surface of the first tube 14 at the lower end portion of the first pipe 14 arranged.

In the annulus 18 are deflection baffles 28 , The deflection baffles 28 are as plate-shaped guide elements 30 formed in the axial direction of the first and second tube 14 . 16 are helically guided to the heat-absorbing medium helically in the annulus 18 respectively. The guide elements may be metal plates such as a sheet metal or plastic plates.

On the outer wall of the first pipe 14 and on the inner wall of the second tube 16 is a variety of heat conduction plates 31 arranged in the radial direction. The heat conducting plates 31 protrude into the space flowed through by the heat transfer medium. The heat conducting plates 31 are thus heated by the heat carrier without representing a flow resistance for the heat transfer medium. The heat conducting plates 31 serve to add heat to the annulus 18 to lead to improve the heat exchange between the heat transfer medium and heat-absorbing medium on.

In addition to the Wärmeleitblechen 31 are in the annulus 18 Heat transfer plates 33 intended. The heat transfer sheets 33 are on the inner wall of the first tube 14 and on the outer wall of the second tube 16 attached and protrude into the annulus respectively 18 , In order not to interfere with the flow of the heat-absorbing medium, the heat transfer plates 33 in the radial direction shorter than the distance between the first tube 14 and the second tube 16 , ie the heat transfer plates protrude only over a short section into the annulus. Like the heat conducting sheets 31 serve the heat transfer sheets 33 to further improve the heat exchange between the heat transfer medium and the heat-absorbing medium.

When in 1 heat conducting 31 and heat transfer sheets 33 both on the first tube 14 as well as the second tube 16 are provided, it is sufficient in the context of the present invention, when the Wärmeleitbleche 31 or the Heat transfer plates 33 attached to only one pipe.

A heat carrier such as flue gas flows in the pipe section 12 both between the inner wall of the pipe section 12 and the outer wall of the first tube 14 along as well as through the second tube 16 , A heat-absorbing medium such as heating water of a heating system passes through the inlet 20 into the interior of the pipe section 12 and gets through the annulus 18 helical to the spout 22 guided. Here, the heat-absorbing medium absorbs the heat of the heat carrier, while the heat carrier cools.

In 2 is a second embodiment of a heat exchanger 110 represented by the in 1 illustrated embodiment characterized in that in the annulus 118 between the first pipe 114 and the second tube 116 another type of deflection baffles 128 is installed. The deflection baffles 128 consist of plate-shaped, parallel to the longitudinal axis of the first and second tube 114 . 116 aligned guide elements, of which in 2 exemplified two guide elements 138a . 138b are shown. The guide elements 138a . 138b may be metal plates such as a sheet or plastic plates.

The feed 120 in the annulus 118 is at the same, in particular upper end portion of the first tube 114 arranged like the expiration 122 , The feed 120 and the process 122 pointing in opposite directions.

3 shows the in 2 illustrated embodiment in a perspective view, in which case a plurality of guide elements 138a . 138b . 138c . 138d . 138e is provided.

In the ring chamber 118 are the guiding elements 138a and 138b at the front 140 of the first and second tubes 114 . 116 at the inlet 120 is provided, as well as on the first tube 114 and the second tube 116 attached. The guide elements 138a and 138b form together with the first and second tube 114 and 116 a first filling room 142 and have a shorter length than the first and second tubes 114 . 116 , This creates a first inner outlet opening 144 that with another filling space 146 communicated.

The second filling room 146 gets through the first pipe 114 , the second pipe 116 , the guide elements 138a . 138b as well as the guide element 138c and an unillustrated, arranged on the opposite side guide member formed. The guide element 138c as well as its associated, not shown guide element on the opposite side are on the front side 148 of the first and second tubes 114 . 116 attached, the far from the inlet 120 lies. A second inner outlet opening 150 that with a third filling space 152 communicates, is at the front 140 provided, at which the inlet 120 located.

The third filling room 152 is through the guide element 138c as well as its associated guide element, not shown, on the opposite side, two further guide elements 138d and 138e and the first and second tubes 114 . 116 educated. The guide elements 138e and 138d are analogous to the guide elements 138a and 138b at the frontal area 140 of the first and second tubes 114 . 116 , at the entrance 120 located, fastened. A third inner outlet opening 154 that with a fourth filling space 154 communicates is like the first inner orifice 144 in the area of the front side 148 of the first and second tubes 114 . 116 provided, which are far from the inlet 120 lies.

The fourth filling room 156 is between the guide elements 138d and 138e and the first pipe 114 and the second tube 116 trained, the process 122 with the fourth filling space 156 communicated.

The heat-absorbing medium is through the inlet 120 in the first filling room 142 guided and passes through the first inner drain opening 144 in the second filling room 146 , From the second filling room 146 that by means of the second inner drain opening 150 with the third filling room 150 communicates, the heat-absorbing medium is again in the opposite direction through the annulus 118 passed through and passes through a third inner drain opening 154 in the fourth filling room 156 and finally comes through the process 122 outward. In this way, the heat-absorbing medium in the longitudinal direction of the annular space 118 four times along the first and second tube 114 . 116 guided, so that the heat-absorbing medium a long residence time in the annulus 118 having.

At the in 3 illustrated embodiment four filling spaces are provided. In the context of the invention, however, more or less filling spaces can be provided.

In one embodiment, not shown, a separating element may be provided in the region of the inlet instead of a guide element, so that the heat-absorbing medium can flow either only counterclockwise or only in a clockwise direction. The guide elements are mounted alternately in the circumferential direction on the opposite end faces, so that the heat-absorbing medium in the annular space along the circumference of the first and second tube along the first and second tube is guided back and forth. To make full use of the available annular space, the outlet is expediently arranged in the region of the separating element.

4 shows a third embodiment of a heat exchanger 210 ,

In the pipe section 212 is concentric in a first pipe 214 a second tube 216 arranged. In the first tube 214 are an inflow 220 and a process 222 intended. The feed 220 is formed as a pipe section and is via an opening 224 in the coat of the pipe section 212 led to the outside.

In the pipe section 212 are a third pipe 260 and a fourth pipe 262 intended. The third pipe 260 and the fourth pipe 262 are arranged concentrically, wherein the first and second tube 214 . 216 concentric in the third tube 260 are aligned. The two pipes 260 and 262 form an annulus between them 268 out.

The third pipe 260 is open at its two end faces, while the fourth tube 262 at its end faces in the region of the annulus 268 closed is.

The third pipe 260 has an inlet 264 on. The sequence 222 of the first pipe 214 and the feed 264 to the third pipe are by means of a connecting web 266 connected to each other, so that from the third pipe 260 and the fourth tube 262 trained annulus 268 with the annulus 218 between the first pipe 214 and second tube 216 communicated. In the fourth tube 262 is how better in 5 it can be seen, a process 270 provided, which is designed as a pipe section and through an opening 272 the mantle of the pipe section 212 is led to the outside.

Both in the annulus 218 between the first and second tubes 214 . 216 and the annulus 268 between the third and fourth pipe 260 . 262 are helical deflection baffles 274 intended.

As in 5 can be seen, the heat-absorbing medium flows through the inlet 220 in the annulus 218 and becomes helical through the first and second tubes 214 . 216 to the spout 222 of the second tube 216 guided. Over the connecting bridge 266 the heat-absorbing medium enters the annulus 268 of the third and fourth tube 260 . 262 , From there, the heat-absorbing medium through the annulus 268 helical to the outlet 270 in the fourth tube 262 guided.

A heat carrier such as flue gas flows between the inner wall of the pipe section 212 and the outer wall of the fourth tube 262 , between the inner wall of the third tube 260 and the outer wall of the first tube 214 and finally through the second tube 216 through the pipe section 212 ,

While the heat-absorbing medium through the two annular spaces 218 and 268 flows, flows the heat transfer medium at the annular spaces 218 and 268 along and heats the heat-absorbing medium while the heat carrier is cooled.

In 6 is a fourth embodiment of a heat exchanger 310 shown. The heat exchanger 310 includes two annular spaces 318 and 368 each of a first and second tube 314 . 316 and a third and fourth tube 360 . 362 be formed.

In the annuli 318 and 368 are deflection baffles in the form of guide elements 338 intended. For the sake of clarity was in the 6 the representation of the guide elements in the annulus 318 omitted. The structure and operation of the guide elements 338 of which in 7 for the annulus 368 a guide element 338 is exemplified, correspond to the structure and operation of the guide elements, as related to 3 have been described.

Thus, a heat-absorbing medium through a supply line 320 in the annulus 318 to the spout 322 of the first pipe 314 guided. The heat-absorbing medium passes over the connecting web 366 in the annulus 368 , In the third and fourth tube 360 . 362 shares a guide element 338 the annulus 368 in a first and second filling space 380 and 382 , so that the heat-absorbing medium in the longitudinal direction of the third and fourth tube 360 . 362 is guided back and forth until it reaches the outlet 370 passes and out of the pipe section 312 is led out.

In the first and second annulus may be provided a plurality of guide elements which divide the first and second annulus in a plurality of filling spaces.

Although not shown, so is related to the annuli 218 . 268 ; 318 . 368 of the first and second tubes 214 . 216 ; 314 . 316 and the third and fourth tubes 260 . 262 ; 360 . 362 every combination of deflection baffles is conceivable. Thus, for example, a helical deflection baffle can be provided in an annular space and a deflection baffle with plate-shaped guide elements aligned parallel to the longitudinal axis can be provided in the other annular space. In the context of the invention, it is also possible to omit a deflection baffle in one of the two annular spaces.

If only heat exchangers 210 . 310 have been shown, which comprise two annular spaces, so the number of annular spaces can be extended to three annular spaces or more annular spaces, in addition pairs of concentric tubes are provided. In the additional annular spaces deflection baffles of various types may be provided.

The related to 1 shown Wärmeleitbleche 31 or heat transfer sheets 33 are used in all embodiments lying within the scope of the invention.

In one embodiment, not shown, the outermost tube, which forms an annular space with an inner tube, be formed integrally with the pipe section.

To reduce the flow resistance, at least the end faces of a concentric pair of tubes, which point in the flow direction of the heat carrier, be formed chamfered.

The heat exchanger is used, for example, in heating systems in which the heat transfer medium is flue gas, or in car exhaust systems of internal combustion engines, in which the heat transfer medium is exhaust gas.

The heat exchanger can be formed together with an outer tube as a module that can be used directly in a section of a pipe, whereby the installation of the heat exchanger is very easy.

Claims (12)

Heat exchanger kit for insertion into a flowed through by a heat transfer tube section ( 12 ; 112 ; 212 ; 312 ) consisting of: a) a first and a second tube ( 14 . 16 ; 114 . 116 ; 214 . 216 ; 314 . 316 ), which are arranged concentrically, wherein a1) the tubes between them an annular space ( 18 ; 118 ; 218 ; 318 ) to guide the heat-absorbing medium, a2) the first tube ( 14 ; 114 ; 214 ; 314 ) at its end faces in the region of the annular space ( 18 ; 118 ; 218 ; 318 ) is closed and the second tube ( 16 ; 116 ; 216 ; 316 ) is open at its end faces, b) a first inlet ( 20 ; 120 ; 220 ; 320 ) and a first process ( 22 ; 122 . 222 ; 322 ) in the first tube ( 14 ; 114 ; 214 ; 314 ) for the heat-absorbing medium, b1) the first inlet ( 20 ; 120 ; 220 ; 320 ) and the first process ( 22 ; 122 . 222 ; 322 ) with the annulus ( 18 ; 118 ; 218 ; 318 ), b2) so that the annulus ( 18 ; 118 ; 218 ; 318 ), the first inflow ( 20 ; 120 ; 220 ; 320 ) and the first process ( 22 ; 122 . 222 ; 322 ) form a closed conduit system for the heat-absorbing medium, and c) deflection baffles ( 28 ; 128 ) in the annulus ( 18 ; 118 ; 218 ; 318 ) are provided and the heat-receiving medium helically through the annulus ( 18 ; 118 ; 218 ; 318 ) or repeatedly in the longitudinal direction through the annulus ( 18 ; 118 ; 218 ; 318 ) to lead. Heat exchanger kit according to claim 1, characterized in that the deflection baffles ( 28 ) as guiding elements ( 30 ; 274 ) are formed in the axial direction of the first and second tube ( 14 . 16 ; 214 . 216 ) helically in the annulus ( 18 ; 218 ) are guided. Heat exchanger kit according to claim 1, characterized in that the deflection baffles ( 128 ) a first and a second plate-shaped, aligned parallel to the tube axis guide element ( 138a . 138b ), which are respectively connected to the first and second tubes ( 114 . 116 ) and at least one end face ( 140 ) of the annulus ( 118 ), so that between the first and second tubes ( 114 . 116 ) a first filling space ( 142 ), wherein the first inlet ( 120 ) in the first tube ( 114 ) with the first filling space ( 142 ) and wherein at the first and / or second guide element ( 138a . 138b ) a first inner drain opening ( 144 ) is provided. Heat exchanger kit according to claim 3, characterized in that the first and / or the second guide element ( 138a . 138b ) shorter than the first and second tubes ( 114 . 116 ) are / is, so that the first inner drain opening ( 144 ) as a gap between the end face ( 148 ) of the annulus ( 118 ) and the first and second guide elements ( 138a . 138b ) is trained. Heat exchanger kit according to one of claims 3 or 4, characterized in that a third guide element ( 138c ) provided on the first and second tubes ( 114 . 116 ) and at least one end face ( 148 ) of the annulus ( 118 ) is attached to a second filling space ( 146 ), wherein the first and second filling space 142 . 146 ) by means of the first inner drain opening ( 144 ) communicate with each other and wherein the second filling space ( 146 ) a second inner drain opening ( 150 ) having. Heat exchanger kit according to one of claims 3 to 5, characterized in that a Variety of filling rooms ( 142 . 146 . 152 . 156 ) are provided, which communicate with each other. Heat exchanger kit according to one of claims 3 to 6, characterized in that in the flow direction of the heat-absorbing medium successive inner drain openings ( 144 . 150 . 154 ) alternately at the two end faces ( 140 . 148 ) of the annular space are provided. Heat exchanger kit according to one of the preceding claims, characterized in that the heat exchanger further comprises a third and fourth tube ( 260 . 262 ; 360 . 362 ), which are arranged concentrically and a second annular space ( 268 ; 368 ), and a second feed ( 264 ; 364 ) on the third tube ( 260 ; 360 ) and a second process ( 270 ; 370 ) on the fourth tube ( 262 ; 362 ), wherein the first and second tubes ( 214 . 216 ; 314 . 316 ) concentrically in the third and fourth tubes ( 260 . 262 ; 360 . 362 ) are arranged and the first annulus ( 218 ; 318 ) with the second annulus ( 268 ; 368 ) and wherein the fourth pipe ( 262 ; 362 ) at its end faces in the region of the second annular space ( 268 ; 368 ) is closed. Heat exchanger kit according to claim 8, characterized in that in the second annulus ( 268 ; 368 ) Deflection baffles are provided, the heat-receiving medium helically through the second annulus ( 268 ; 368 ) or repeatedly in the longitudinal direction through the second annulus ( 268 ; 368 ) to lead. Heat exchanger kit according to claim 9, characterized in that the deflection baffles ( 274 ) are formed as guide elements in the axial direction of the third and fourth tube ( 260 . 262 ; 360 . 362 ) helically in the second annulus ( 268 ; 368 ) are guided, or at least a pair of plate-shaped, aligned parallel to the tube axis guide element ( 338 ), each at an end face of the second annulus ( 368 ) and on the third and fourth tubes ( 260 . 262 ; 360 . 362 ), so that in the second annulus ( 368 ) between the third and fourth tubes ( 360 . 362 ) a filling space ( 380 ), wherein the second inlet ( 364 ) in the third tube ( 360 ) with the filling space ( 382 ) communicates and wherein an inner drain opening is provided. Heat exchanger kit according to one of the preceding claims, characterized in that at least the flow of the heat transfer medium facing end face of the first and / or the second annular space ( 18 ; 118 ; 218 . 268 ; 318 ; 368 ) is bevelled. Heat exchanger kit according to one of the preceding claims, characterized in that at least one Wärmeleitblech ( 31 ) and / or a heat transfer sheet ( 33 ) are / is provided.

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