EP1873465A1 - Heat exchange with ring-shaped flow channels - Google Patents

Abstract

The heat exchanger (100) has a flow channel for a gaseous and liquid heat transfer medium. A ring body (10) has a connection opening for discharging a heat transfer medium and another opening for the exit of the medium, where the heat transfer medium flows through the ring body in the circumferential direction. A set of ring bodies that are arranged parallel to one another at a distance from each other, is provided.

Description

The present invention relates to a heat exchanger, in particular for use in a direct firing or exhaust heat recovery in a heating system, which has at least one flow channel for flow through a gaseous and / or liquid heat transfer medium, and a heat transfer from or to the gaseous and / or liquid Heat transfer medium takes place.

Such heat exchangers are also referred to as heat exchanger plates and are suitable for the transmission of radiation and / or convection heat. The heat exchanger plates can be used in directly fired operation or in exhaust gas heat recovery for heating air or liquids and in the exhaust heat recovery as a downstream heating surface of gas and oil boilers.

Tube heat exchangers in which a heat transfer fluid is heated by means of a heat carrier gas, which is guided via heat transfer tubes through a vessel filled with the liquid and transfers its heat through the tube walls to the liquid, are generally known. Furthermore, finned tube heat exchangers are known, wherein a gas flows through an inner tube, and projects a rib structure in this tube radially inwardly. Concentric with the inner tube, a liquid flows through an outer chamber which is formed around the inner tube. Thus, heat transfer through the wall of the inner tube from or to the gas can be transmitted.

From the DE 199 54 465 A1 a heat exchanger is known, which has an inner chamber which is radially enclosed by an outer chamber. Within the outer chamber, an inner chamber annularly surrounding the intermediate chamber is provided, which is fluidly connected to the inner chamber. The inner chamber is flowed through by a heat transfer gas, wherein the outer chamber is flowed through by a heat transfer fluid. In a physically advantageous manner, the inner wall of the intermediate chamber with its larger outer surface interacts with the heat carrier gas and with its smaller inner surface with the heat transfer fluid. Although the efficiency of a heat transfer between the different heat transfer media is increased with this arrangement, but the structure of the heat exchanger on a considerable design effort.

The DE 35 90 068 C2 discloses a plate heat exchanger for liquid media involving sludge, sewage, industrial process water or the like. This plate heat exchanger comprises flow channels, which are formed with plates, between which baffles are arranged. Between the plate walls connecting channels are present, with a framework by means of which the baffles are clamped between the plates, the dimensions of the baffles are variable with dissolved framework. Thus, although the plate heat exchanger can be adapted to the conditions imposed by the liquids such as temperature and viscosity difference, but also in this present embodiment, the construction of the framework, the baffles and the connecting channels and the flow channels a very complex structure with a variety of items , which must be assembled by welding or the like consuming.

It is therefore the object of the present invention to provide a heat exchanger having a simple and inexpensive construction and a high heat transfer efficiency.

This object is achieved on the basis of a heat exchanger according to the preamble of claim 1 in conjunction with its characterizing features. Advantageous embodiments of the invention are specified in the dependent claims.

By the invention it is provided that the heat exchanger has at least one annular body which has at least one connection opening for introduction and at least one further connection opening for discharging the heat transfer medium, wherein the heat transfer medium flows through the annular body in the circumferential direction.

The invention is based on the idea that the heat exchanger is formed from a minimum number of individual parts. At the same time, the formed heat exchanger meets the demand that a large heat transfer surface is available and the heat exchanger has a high efficiency. The flow channel for the flow through the gaseous and / or liquid heat transfer medium is formed in the interior of the ring body, so that the heat between the medium surrounding the ring body from the outside, can pass on the gaseous and / or liquid heat transfer medium in the ring body itself. If the heat exchanger is intended for use in direct firing or for exhaust gas heat recovery, then the at least one ring body can be arranged in the hot atmosphere of the firing, so that a heat transfer due to the open both on the inside, as well as outside and on the side surfaces of the annular body shape can take place. The cross-sectional shape of the annular body is flat due to a rather plate-shaped shape, so that the width of the annular body, for example, is less than the difference between outer radius and inner radius of the ring structure.

An advantageous embodiment of the present invention provides that the heat exchanger has a plurality of annular bodies, which are arranged parallel spaced from each other. In this case, the respective connection openings of the parallel spaced arrangement of the ring body are fluidly connected to each other, so that, for example, a successive flow or a parallel flow through the ring body takes place with the heat transfer medium. In this case, the annular bodies are successively flowed through in alternating direction with the heat transfer medium, wherein in each case a connection opening is closed and the ring bodies are welded together or pressed together.

The number of annular bodies, which form the entire heat exchanger, is not fixed and can be adapted to the available space and to the size of the firing or the exhaust heat recovery device. The distance between the respective annular bodies to each other can be kept constant or vary arbitrarily, wherein also a different type of arrangement can be provided, which does not align the annular body parallel to each other. The distance of the ring body to each other should, however, advantageously comprise a minimum distance to allow a flow around the ring body with the heat transfer medium outside of the ring body.

The heat transfer medium, which flows through the annular body, enters through the connection openings in the annular body and first flows through the annular body in the circumferential direction, and exits from the at least one further connection opening of the annular body again. Due to the fluidic connection of the connection openings with the connection openings of the adjacent annular bodies, for example, these can be flowed through in succession or in parallel. The connection openings of the respective annular bodies have a projection from the plane side surfaces of the annular bodies, so that the connection openings of the respective annular bodies can be joined to one another. Consequently a minimum distance between the ring bodies is maintained, which are each connected to each other via the connection openings.

A flow through the ring body in the direction of exchange with the heat transfer medium allows a more uniform transfer of heat from the outside of the ring body to the medium in the interior of the ring body, so that no unilateral preferred direction with a non-uniform heat distribution in the heat exchanger is formed, in each case a non-flow through connection opening must be closed so that a reciprocal inflow or outflow of the heat transfer medium can take place after flowing through the annular body in the circumferential direction.

A further advantageous embodiment of the invention provides that pipe elements are arranged between the connection openings of the respective annular body in order to create both a mechanical and a fluidic connection of the annular body to one another. Thus, the possibility is created to arrange the ring body with a greater distance from each other, wherein the individual annular bodies are fastened by the tubular elements and are held thereon. Thus, depending on the power requirement, a plurality of ring bodies can be connected to one another via the connection openings, the connection to the pipe elements being able to be effected by welding or by a mechanical joining connection, whereby O-ring seals can be provided for the fluidic sealing. An application of tie rods is conceivable, which pull the ring body in total on block and so form a mechanical overall arrangement.

Depending on requirements, the pipe elements may be formed as straight pipe connections or comprise curved or bent pipes, so that connection openings are also connected to each other, which are not facing each other between the ring bodies. So it is possible, for example, connection openings to connect to each other, which are located on the ring body in a 180 ° offset position.

The annular body is advantageously formed from two half-shells, which have a respective annular cavity, wherein the half-shells are brought to each other on the cavity side, to form the flow channel. Thus, the heat exchanger can be designed in terms of manufacturing technology, in which the annular bodies are produced from sheet metal components, which are each brought opposite each other in a circular half-shell shape so that the inside cavity for forming the flow channel is formed.

The half-shells for forming the ring body are pressure-tightly connected to each other by means of a joining process, the joining process comprising in particular a welding and / or a soldering process and / or a pressing process. A simple way of producing the half shells to form the annular body can be seen in the forming process of the sheet material, wherein the forming process may relate to stamping and deep drawing process. Thus, a very inexpensive and mass production suitable production of the sheet metal components of the heat exchanger is possible, wherein the half-shells of the annular body can be formed symmetrically in order to minimize the parts variance to form the heat exchanger. The geometric configurations of the half-shells can each be produced in the stamping and deep-drawing process, without carrying out further complicated production steps. Thus, only a deep-drawing process with a final shear cut is sufficient, wherein subsequently the half-shells are brought to one another and welded together or soldered or pressed. The inner and outer diameter of the annular body is variable depending on the power requirement with respect to the heating surface or cooling surface, wherein, depending on the power requirement of the heat exchanger, the width of the annular body to the amount of heat transfer fluid can be adjusted, which flows through the ring body per unit time.

An advantageous development of the invention provides that the connection openings are arranged on the upper side in the installation position of the heat exchanger relative to a force acting in the direction of a bottom gravity. This can proceed unhindered down at a condensate formation in the gaseous heat transfer medium or in another to be warmed or aufheizenden medium without stagnation and be discharged via a drain in the enclosing housing of the heat exchanger to the outside. Likewise, a perfect ventilation of the annular body for the medium flowing through, such as water, oil or refrigerant is ensured by the top-side arrangement of the connection openings, since the air in the ring bodies can freely escape upwards and thus ensures a good flow.

Advantageously, at least one of the half-shells forming a ring body has knob-like elevations in order to provide a minimum distance to the adjacent ring body. The knob-like elevations may be stamped or stamped into the half-shells formed from sheet material, and are arranged distributed uniformly over the circumference of the annular body. Now, if at least two annular body arranged parallel to each other, the knob-like elevations of the half-shells touch the respective adjacent half-shell, and allow compliance with a minimum distance of the ring body to each other. It is sufficient to provide on each one half shell, the knob-like elevations, since they are sufficient for maintaining a minimum distance between two adjacent shells.

According to a further embodiment improving the invention, it is provided that a separating web is arranged in the flow channel, which is introduced between the connection openings in order to flow through the Specify flow channel with the heat transfer medium in a circumferential direction in the ring body. The separating web effects a fluidic separation between the connection openings, so that when the heat transfer medium flows into the interior of the annular body, it can not escape again immediately via the adjacent connection opening, but completely flows through the annular body in the circumferential direction. The divider can be arranged as a metal element in the half-shells, which is fastened for example by a welded joint or a solder joint within the flow channel in the half-shells. The divider can also be a plastic or another sealing element.

A further advantageous embodiment of the present invention relates to depressions, which are impressed distributed in the half-shells on the circumference, and which adjoin to opposite recesses of the annular body forming the second half-shell. Thus, the possibility is created to connect the half shells by means of spot welds with each other to prevent bulging of the half shells under the influence of pressure of the heat transfer medium. The spot welds are introduced within the recesses, as the half shells touch each other at the respective levels in the recesses. Now, if the annular body is pressurized with the heat transfer medium, it can be prevented due to the stability-increasing effect of the spot welds that bulge the half-shells or that there is a bursting of the annular body. The recesses are arranged distributed on the circumference and are located approximately at half the width of the annular body, so that they are arranged on the half of the diameter difference between the inside and the outside in the radial direction. Thus, the possibility is still created to use a comparatively thin sheet material for the formation of the half shells, which gives the annular body each a sufficient stability due to the introduced spot welds and at the same time serves to increase the efficiency of the heat exchanger to a good heat transfer to create between the inner and outer heat transfer medium of the ring body.

The annular body is bounded by an inner side, an outer side and the respective left and right side surface. In this case, the heat transfer medium passing through the heat transfer medium in the annular body exchanges heat with the environment of the annular body, with radiant heat transfer taking place via the inside and / or outside. A convective heat transfer, however, takes place via the side surfaces of the half-shells. It should be noted that a convection heat transfer can also take place on the inside and the outside, where, however, via the side surfaces a radiant heat transfer can be made possible and the respective forms of heat transfer is not limited to said areas. In accordance with the present invention, the preferred heat transfers across the inside and / or outside of the radiant heat transfer and the convective heat transfer across the side surfaces are to be considered as merely a preferred form of heat transfer. The inner side bounds the circumferential ring of the annular body radially inwardly, and the outer surface bounded the circumferential ring of the annular body radially outward. The side surfaces are formed by the flat surfaces of the half-shells, and limit the ring body laterally. In this case, the connection openings are introduced in the side surfaces, whereas the joint connection of the two half-shells is provided on the inside or on the outside.

Advantageously, the annular body and / or the tubular elements may comprise a stainless steel and / or a black sheet steel, wherein the black sheet steel in particular comprises on the outside a black plastic coating. Stainless steel is characterized as a rust-free material, and is not reactive with most heat transfer media. The use of a black steel sheet is particularly useful for the use of heat recovery in oil or gas boilers possible, after the welding of the two half-shells on the abgasberührt side a suitable plastic coating is applied.

A further advantageous embodiment of the invention provides that the annular body is made of graphite and / or in the sintering process, comprising a ceramic, wherein for connecting the half shells of the annular body or for connecting the annular body to a heat exchanger, a mechanical joining method is used, and between the half-shells ring seals are used for fluidic sealing. In such a manufacturing method, a ring seal such as an O-ring seal must be used as a seal in the subsequent connection, since fluid sealing methods such as welding of the half shells due to the selection of materials omitted.

On the annular body and / or on the tubular elements additional heat exchanger surfaces in the form of ribs or the like may be provided in order to further improve the heat transfer between the inside and the outside of the heat transfer medium. The rib-shaped heat exchange surfaces can be made available at the same time as mechanical stiffening elements between the annular bodies or between the tubular elements and the annular bodies.

Also, the shape of the ring body is not limited to a circular or oval contour, z. B. is also a rectangular or square outer and / or inner contour conceivable, which is still considered as annular. Even in these forms, the inner heat transfer medium flows in the circumferential direction through the annular body.

Fig. 1

eine perspektivische Ansicht des Wärmetauschers;

Fig. 2

eine Ansicht des Wärmetauschers gemäß Figur 1;

Fig. 3

eine Ansicht des Wärmetauschers mit geradlinig ausgebildeten Rohrelementen zwischen den Ringkörpern;

Fig. 4

eine Ansicht des Wärmetauschers mit gebogenen Rohrelementen zwischen den Ringkörpern;

Fig. 5 a

eine Ansicht eines Ringkörpers;

Fig. 5 b

eine Seitenansicht des Ringkörpers gemäß Figur 5a;

Fig. 6a

eine Ansicht eines Ringkörpers mit einer geänderten Durchströmungsrichtung;

Fig. 6b

eine Seitenansicht des Ringkörpers gemäß Figur 6a;

Fig. 7a

eine Ansicht eines Ringkörpers mit geänderter Durchströmungsrichtung;

Fig. 7b

eine Seitenansicht eines Wärmetauschers mit vier zusammengefügten Ringkörpern;

Fig. 8a

eine Ansicht eines weiteren Ausführungsbeispiels eines Ringkörpers mit einem Trennelement;

Fig. 8b

eine Seitenansicht des Ringkörpers gemäß Figur 8a; und

Fig. 9

eine Ansicht eines Ringkörpers mit einer rechteckigen Außenkontur.

Further, the invention improving measures are specified in the subclaims or are described below together with the description of preferred embodiments of the invention with reference to the figures shown in more detail. In a purely schematic representation:

Fig. 1

a perspective view of the heat exchanger;

Fig. 2

a view of the heat exchanger of Figure 1;

Fig. 3

a view of the heat exchanger with rectilinear tubular elements between the annular bodies;

Fig. 4

a view of the heat exchanger with bent tubular elements between the annular bodies;

Fig. 5 a

a view of a ring body;

Fig. 5 b

a side view of the ring body of Figure 5a;

Fig. 6a

a view of an annular body with a changed flow direction;

Fig. 6b

a side view of the ring body of Figure 6a;

Fig. 7a

a view of a ring body with a changed flow direction;

Fig. 7b

a side view of a heat exchanger with four assembled ring bodies;

Fig. 8a

a view of another embodiment of a ring body with a separating element;

Fig. 8b

a side view of the ring body of Figure 8a; and

Fig. 9

a view of an annular body with a rectangular outer contour.

The heat exchanger 100 shown in FIG. 1 comprises by way of example three annular bodies 10, which are connected to one another via tubular elements 14. The tubular elements 14 each extend in pairs between the annular bodies 10 and are arranged on these upper side. The connections for the supply or discharge of the heat transfer medium, which flows through the annular body or the pipe elements, are not shown. The annular bodies 10 are held by the tubular elements 14 and arranged in parallel adjacent to each other at a predetermined distance. The distance between the ring elements 10 is thus determined by the length of the tubular elements 14, through which at the same time the heat transfer medium can flow from ring body to ring body. Thus, the tubular elements 14 take both the task of mechanical connection of the ring body 10 true to each other, and at the same time create a fluidic connection between the annular bodies 10. The entire unit of the heat exchanger 100 is - as shown in Figure 1 - flows around the outside with the heat transfer medium, which the Heat exchanges with the medium that flows through the ring body. Thus, the illustrated unit can be installed, for example, in the furnace of a heater or in the area of exhaust heat recovery of the exhaust gas of a heating system. Due to their open or free arrangement, the ring bodies 10 offer a large surface area for exchanging or transferring the heat of the surrounding medium with the medium flowing through, so that a high efficiency of the heat exchanger can be achieved.

FIG. 2 shows an isometric view of the heat exchanger 100 according to FIG. 1, wherein in this illustration too, three annular bodies 10 communicate with each other via respective pipe elements 14. The flow channel, which is extends circumferentially within the ring body 10 is indicated by dashed lines.

FIG. 3 shows a further exemplary embodiment of a heat exchanger 100, wherein the annular bodies 10 are connected to one another via tubular elements 14 which are not arranged completely on the upper side of the annular bodies 10. Rather, the pipe elements 14 are in a position offset by 180 ° to each other, so that the flow through the ring body 10 according to this embodiment can be carried out differently. For example, it is possible to introduce the heat transfer medium in the annular body 10 via a tubular element 14 so that it flows through the annular body 10 both in a clockwise and counterclockwise direction and is discharged on the 180 ° offset position again from the ring body 10 to in the to arrive next ring body. The connection between the ring bodies 10 is realized in each case over the same length and straight tube elements.

According to the embodiment in Figure 4, the ring body 10 are each again three times parallel adjacent to each other, wherein the tube elements 14 are formed in a curved shape, and alternately the connection openings of the ring body 10 at an angle of, for example, 180 ° offset from each other. By means of the various designs of the tubular elements 14, it is possible to form the flow through the annular body 10 each differently.

In FIGS. 5a and 5b, an annular body 10 is shown in each case, the illustration in FIG. 5a taking place from the direction of the side surface, whereas the representation of the annular body 10 in FIG. 5b comprises a side view. The annular body 10 is formed from a first half-shell 12 and a second half-shell 13, which are interconnected by circumferential welds. The welds are located both on the circumference in the inner side 17 of the ring body 10, as well as on the outside 18. The side is limited Annular body 10 through the side surfaces 19. On the half-shell 12 shown in plan view in Figure 5a, connection openings 11 are shown to provide an inlet or outlet opening for the heat transfer medium. At the connection openings 11 either the pipe elements (not shown here) are attached or the connection openings 11 are brought from ring body 10 to ring body 10 each on each other and welded if possible.

Between the connection openings 11 is a separating web 16, which prevents the heat transfer medium can flow directly between the connection openings 11. Thus flows into one of the connection openings 11, the heat transfer medium and runs in the circumferential direction through the entire ring body 10 and exits on the opposite side at the second connection opening 11 again.

On the circumference elevations 15 are provided which protrude from the flat surface of the half-shell 12 in the shape of a knob. This makes it possible that with a successive assembly of a plurality of ring body in a parallel arrangement to each other a minimum distance can be maintained. The elevations 15 are introduced by means of a stamping or stamping process in the sheet material, wherein a total of eight elevations 15 are shown. However, a different number of surveys is possible, which need not necessarily be uniformly distributed on the circumference. Between the elevations 15 recesses 20 are occasionally formed, which are so deeply inserted into the sheet material of the half-shells 12, 13, that touch each other in a juxtaposed arrangement of half-shell 12 to half-shell 13. Center welds are provided centrally in the recesses 20 to provide a connection of the half shells 12, 13 over the spot welds within the recesses 20. Thus, an increase in the stability or strength of the annular body 10 can be achieved. In total, four recesses 20 are provided at a respective angle of 90 ° to each other, whereby in this case also a larger or smaller number of recesses 20 is possible. The recesses 20 and the elevations 15 are each arranged centrally in the ring width of the annular body 10, so that they are located on the inner side 17 on the half of the radius difference between the outer diameter on the outer side 18 and the inner diameter. In this case, a different distribution of the mentioned features is possible, so that there is an asymmetrical design of the annular body 10. The connection openings 11 are each formed as elevations of the flat side surfaces 19 collar-shaped, so that they allow a Aufeinanderfügen a minimum distance of the respective half-shells 12 and 13 of the ring body 10. All embodiments of the abovementioned features can be produced by forming processes or by embossing, stamping and bending processes, wherein other manufacturing processes can be used.

Figures 6a and 6b and Figures 7a and 7b show an alternative embodiment of an annular body 10, which has a changed flow direction. The heat exchanger 100 has four ring bodies 10, whose half shells according to this embodiment only comprise a punched-through connection opening 11. When connecting a plurality of these ring body 10 to a heat exchanger, it is possible to flow through the individual ring body 10 alternately. In this case, at least two annular body 10 must be connected to each other, which are then respectively flowed through in opposite directions. In this method, two connection openings 11 a are held closed or not perforated during production in alternation, so that a connection opening 11 is opened and a connection opening 11 a is closed. The mutual connection opening 11a and the perforated connection opening 11 are connected to the respectively following ring body 10 and the corresponding connection openings 11.

In order to ensure perfect venting in this variant, it is necessary to provide a ventilation opening 21 on the divider 16, through which the air can flow over the connection opening 11. In this arrangement of ring bodies 10 is to use a different manufacturing process, as in a connection with two identical bodies. The remaining features of the annular body 10 such as the knob-like elevations 15 or the recesses 20 for the spot welded joints remain unchanged compared to the embodiments of Figures 5a and 5b.

FIGS. 8a and 8b show another embodiment of a ring body 10 with an annular separation element 22. This is located in the parting plane of the two half-shells 12 and 13, and forms a dividing wall within the flow channel in the annular body 10. The separator 22 may be joined in the same way by way of example by a welding process, as the half-shells 12, 13 themselves to each other are joined. On a 180 ° opposite side of the only per half-shell 12, 13 formed connection opening 11, a through hole 23 is inserted into the separating element 22. This eliminates the divider (divider 16, see Figure 5a, 5b). Through the introduced separating element 22, the heat transfer medium flows via a connection opening 11 from a first half-shell 12 into the annular body 10 and flows through this to 180 °, whereupon the heat transfer medium flows through the passage opening 23. In the second section of the flow channel of the second half-shell 13, the heat transfer medium flows from the through-hole 23 back to the connection opening 11a arranged offset by 180 °, which, as in the first half-shell 12, is simply inserted therein. Also in this embodiment, a through-hole 24 is introduced above the connection opening 11 in order to allow a venting of the annular body 10.

FIG. 9 shows a further exemplary embodiment of a ring element 10 which has a rectangular or square outside 18. Depending on the installation space, the contour may have advantages, especially as a larger surface is available for heat transfer. With respect to the connection openings 11 and 11a, these are represented twice per half shell, which, however, can also be provided only once per half-shell in an alternative embodiment. The inner side 17 is formed in FIG. 9 as a circular contour, which however can also be represented as an angular or oval contour.

The present invention is not limited in its embodiments to the specified embodiments. Rather, a variety of variants are conceivable, which also make use of the solutions shown in fundamentally different embodiments of the invention.

LIST OF REFERENCE NUMBERS

100

heat exchangers

10

ring body

11

port opening

12

half shell

13

half shell

14

tube element

15

survey

16

divider

17

inside

18

outside

19

side surface

20

deepening

21

ventilation opening

22

annular separating element

23

Through opening

24

Through opening

Claims (18)

Heat exchanger (100), in particular for use in a direct firing or exhaust gas heat recovery in a heating or heat generating plant, which has at least one flow channel for flow through a gaseous and / or liquid heat transfer medium, and a heat transfer from or to the gaseous and / or liquid heat transfer medium is carried out, characterized in that the heat exchanger (100) has at least one annular body (10) which has at least one connection opening (11) for introduction and at least one further connection opening (11) for discharging the heat transfer medium, wherein the heat transfer medium the annular body ( 10) flows through in the circumferential direction. Heat exchanger according to claim 1, characterized in that the heat exchanger (100) has a plurality of annular bodies (10), which are arranged parallel spaced from one another. Heat exchanger according to claim 1 or 2, characterized in that for parallel spaced arrangement of the annular body (10), the respective connection openings (11) are fluidically interconnected, such that a successive flow through the annular body (10) or a parallel flow through the annular body (10 ) takes place with the heat transfer medium. Heat exchanger according to claim 1 to 3, characterized in that the annular body (10) are successively flowed through in alternating direction with the heat transfer medium, wherein in each case a connection opening (11) is closed and the annular body (10) are welded together. Heat exchanger according to one of the preceding claims, characterized in that between the connection openings (11) of the respective annular body (10) tube elements (14) are arranged to provide both a mechanical and a fluidic connection of the annular body (10) to each other. Heat exchanger according to one of the preceding claims, characterized in that the annular body (10) of two half-shells (12, 13) is formed, which have a respective annular cavity, and the half-shells (12, 13) are brought together on the cavity side to the flow channel form. Heat exchanger according to claim 6, characterized in that the half-shells (12, 13) for forming the ring body (10) by means of a joining process pressure-tight with each other are brought into connection, wherein the joining method comprises in particular a welding and / or a soldering and / or pressing method , Heat exchanger according to one of the preceding claims, characterized in that the connection openings (11) are arranged on the upper side in the installed position of the heat exchanger relative to a force acting in the direction of a bottom gravity. Heat exchanger according to claim 6 to 8, characterized in that at least one of the annular body (10) forming half-shells (12, 13) knob-like elevations (15) to provide a minimum distance to the adjacent annular body (10). Heat exchanger according to claim 6 to 9, characterized in that in the flow channel within the half-shells (12, 13), a separating web (16) is provided, which is introduced between the connection openings (11), to predetermine a flow through the flow channel with the heat transfer medium in a circumferential direction in the ring body (10). Heat exchanger according to claim 6 to 10, characterized in that in the half-shells (12, 13) distributed on the circumference recesses (20) are impressed, which on opposite recesses (20) of the annular body (10) forming the second half-shell (12, 13 ), so that they can be connected to one another by means of spot welding in order to prevent bulging of the half shells (12, 13) under the influence of pressure of the heat transfer medium. Heat exchanger according to claim 6 to 11, characterized in that the annular body (10) forming half-shells (12, 13) formed from a sheet material and by means of forming process, comprising stamping and deep drawing process are prepared. Heat exchanger according to one of the preceding claims, characterized in that the annular body (10) by an inner side (17), an outer side (18) and side surfaces (19) is limited. Heat exchanger according to claim 13, characterized in that the flow channel in the annular body (10) passing heat transfer medium heat exchanges with the environment of the annular body (10), wherein a radiant heat transfer via the inside (17) and / or the outside (18). Heat exchanger according to claim 13, characterized in that a convection heat transfer via the side surfaces (19) of the half-shells (12, 13) takes place. Heat exchanger according to one of the preceding claims, characterized in that the annular body (10) and / or the tubular elements (14) comprise a stainless steel and / or a black steel sheet, wherein the black steel sheet, in particular on the outside, comprises a, in particular black, plastic coating , Heat exchanger according to one of the preceding claims, characterized in that the annular body (10) made of graphite and / or in the sintering process, comprising a ceramic, wherein for connecting the half-shells (12, 13) of the annular body (10) or for connecting the Ring body (10) to a heat exchanger, a mechanical joining method is used, and between the half-shells (12, 13) annular seals for fluidic sealing are used. Heat exchanger according to claim 1 to 17, characterized in that on the annular body (10) and / or the tubular elements (14) additional heat exchange surfaces in the form of ribs or the like are provided.

Images