DE102008013013A1 - Tubular profile for the production of pipes and hollow bodies is fitted with an external heat exchange spiral for extracting heat from heat sinks and water flows - Google Patents

Abstract

A tubular profile (1) for the production of pipes and hollow bodies doubles as a heat exchanger for extracting heat from a heat sink, e.g. the soil, and from water flows, e.g. waste water. The profile is fitted with an external heat exchanger coil (12) covering at least part of the length of the profile. The coil is wound in a double helix or multiple helix for improved heat extraction.

Description

The The invention relates to a heat-transferring tube according to the preamble of claim 1.

The Most wastewater generated in households or in industry hold a potential for heat energy. For example Water from dishwashers, washing machines or from manufacturing processes with a high temperature unused to the sewer. These Wastewater leaves a thermal utilization in the urbanized area to. To use this heat for various other purposes to be able to use, are heat transfer facilities necessary.

For a use of the waste heat of waste water or exhaust gases, a number of different devices for heat transfer are known. For example, in the German patent specification DE 32 44 600 C2 discloses a heat exchanger for sewers, in which individual sections of a sewage pipeline through a filled with heat transfer fluid, heat-insulated and closed on all sides container. The sewage pipeline itself is formed into a coil within the container. Within the coil, at least one heat carrier through which a heat-absorbing fluid flows is arranged.

One Such heat exchanger is technically complex and thus only costly to produce. By the relative large dimensions, it is usually not immediately possible producing the heat exchanger near sewage To arrange plants or these in large numbers and to lay with a reasonable effort in the ground. Furthermore is of considerable maintenance and repair, especially in case of expected blockages, go out.

From the German patent application DE 42 02 791 A1 is a heat exchanger for sewage pipe and hose lines known. This contains a coil for passing hot water and connections for connecting the heat exchanger with a corresponding pipeline. In this heat exchanger, the individual turns of the coils are close together and firmly connected. At the ends of the helix are provided connecting pieces to allow connection to a heat pump. The helix provided with the connecting piece forms a pipe fitting which can be mounted in a given line.

at the device shown there must be the connection and merger the sub-elements by means of a separate flow and return respectively. This brings an increased technical effort with himself. In addition, the piping within the coil are design-related in a direct thermal contact, which increases the heat transfer performance reduced the device.

From the German patent application DE 197 19 311 A1 a heat exchanger for sewage pipes is known, with which a heat extraction by means of a special dry water channel can be performed. For this purpose, the dry water channel has, at least in partial areas, at least one heat exchanger element which is in direct contact with the wastewater. This contains a heat-conducting exchange surface, which passes the absorbed heat to a heat exchange medium. The heat exchange medium is guided via a built-in pipe sole flow and return, which are formed by the heat exchanging elements as a circuit with a low temperature level to the heat pump. This system can only be installed relatively expensive. The gutters are usually made of stainless steel and are very expensive. The feeding and returning pipes are embedded in a concrete body of the sole. By installing this heat exchanger is reduced so with the cross section of the sewer or the transporting lines. By contrast, the energy recovery tube has a completely circular cross section without the explicit formation of a gutter / dry weather channel. Therefore, large cross-sections are required, starting at a minimum of DN 800.

The utility model DE 20 2005 013 590 U1 discloses a similar principle. There is a heat exchanger made of corrugated pipe for sewers used. The bottom area of the sewer pipe is equipped with corrugated pipes with flow and return, which realize both the heat transport and the heat extraction. At the end of the planned designed for the removal of heat, the corrugated pipe is guided as a loop around the cross section and the medium returns in the same way. The entire heat exchanger in the sewer thus consists of a single strand.

The heat exchanging pipes and the flow and return of the medium to be transported are in the interior of the sewer pipe arranged and thus form an attack surface for Dirt. They act as disturbing elements in the sole area the pipeline, which require frequent cleaning.

The lesson after DE 20 2004 018 084 U1 discloses an absorber intended for a pipe or canal construction. This has at least one upstream and at least one return connection and at least one of the absorber channels verbin set the flow and return to. The absorber is characterized in that the individual absorber channels are combined in an absorber channel mat and thus form an objective unit. The absorber mat must be made of a material that is flexible at least during installation.

All known from the prior art devices for heat transfer have only a limited scope or are in their Installation and maintenance consuming and expensive.

It Therefore, the object of the invention, a cost manufactured and universally applicable device for heat transfer indicate that both gaseous or liquid Media like a conventional pipe without any functional impairment leads, as well as heat from or to the contained Media can transfer. The device should be under very can be used for different flow and pressure conditions be.

The Solution of the task is carried out with a heat-transferring Pipe according to the features of claim 1. The Subclaims contain appropriate or advantageous embodiments and embodiments the article of the invention.

The Heat transfer tube according to the invention characterized by the fact that it consists of an inner tube, around the helical at least one circumferential channel is located, wherein windings of the channel are spaced from each other.

Of the Invention is therefore based on the idea, a smooth, by any Moldings or additional configurations influenced and therefore not for the flow of the medium therein this hinders advantageous tube by this Tube is surrounded by at least one outer shell, which is responsible for the overall arrangement formed at least double-walled construction of the pipe wall results. This will be the Space between the outer shell and the inner tube divided into a series of spiral channels. By these channels can flow a second medium, wherein both heat transfer via the outer shell from outside the environment or from the inside over the inner tube can be done with the medium contained therein. The Channels run for optimum heat transfer spiral or helical with respect to the longitudinal axis the overall arrangement, d. H. the heat-transferring tube.

at an expedient embodiment an at least in segments double-walled construction of at least a profile provided with outer shell and given an inner tube, the outer shell on the inner tube so rests that between the outer shell and the inner tube with respect to the tube longitudinal axis at least a helically extending channel is formed.

at Another embodiment includes two or more circumferential channels the inner tube helical, wherein the channels a wound around the tube longitudinal axis Train double helix or multiple helix.

A Such design allows a particularly optimal guidance of the medium flowing in the channels.

at a further advantageous embodiment, the Channels have an internal division into at least one outward located outer sub-channel and one in the direction the inner tube located inner sub-channel on. That's it possible, several different heat transfer media to flow in the arrangement thus formed and a Variety of heat transfers between these Media, the medium in the inner tube and the outer Environment.

Conveniently, are pipe end-side formations and / or connecting means for Coupling channels of connectable pipe segments intended. This allows several heat exchanging Pipes to pipe arrangements with a ansich arbitrary length be joined together.

When Connecting means are provided in particular fittings or sleeves. In a further embodiment, the inner tube and / or the Channels designed weldable.

at the pipe according to the invention are several flow directions possible. At least one flow direction is included not about the helix, especially the multiple helix.

The mentioned multiple helix advantageously has at least a flow channel and at least one return channel. The flowing medium in the channels is characterized within the multiple helix both in a forward and in a a return direction out. It occurs thus into the multiple helix and leaves the multiple helix near the inflow point. Thereby can the corresponding connections arranged very close to each other be minimized, thereby minimizing the space required for it becomes.

In addition, in addition to the pipe couplable reversing element for connecting a Flow channel and a return channel of the multiple helix provided. The reversal element can be coupled according to any number of pipe segments and closes the circulation of the medium within the multiple helix.

A the outer shell surrounding insulation may additionally be provided. This is particularly advantageous if the heat transfer between the medium in the inner tube and the media in the channels, especially the multiple helix, be optimized and heat loss to avoid the environment.

One Process for the preparation of said heat-transferring Pipe contains one of the following process steps: Add of the inner tube with the profiled outer shell.

at a manufacturing method in a second embodiment is first profiled at least one tubular Outer shell made. Subsequently, will a smooth inner tube in the profiled outer shell inserted. Finally, a firm connection between generated the inner tube and the outer shell.

at a manufacturing method in another embodiment becomes a helical with respect to the tube longitudinal axis around the inner tube running channel or a multiple helix in Made of a loose winding. Such a production designed with little effort and is for channel designs usable with pressureless flowing media.

The heat transfer tube according to the invention will be explained in more detail below with reference to exemplary embodiments. For clarification serve the attached 1 to 5 , The same reference numbers are used for identical or equivalent parts. It shows:

1 a partial longitudinal section of the tube with channels in a quadrangular shape,

2 a partial longitudinal section of the tube with channels in a triangular shape,

3 a partial longitudinal section of the tube with channels in a rounded shape,

4 a partial longitudinal section of the tube with subdivided channels and

5 other possible cross-sectional shapes of the heat-transferring tube.

1 shows a non-scale perspective view of a pipe section in which the cut line is guided as a longitudinal section for better understanding in a pipe turn. The illustrated pipe section consists of a corrugated profiled outer shell 1 and the smooth inner tube 2 together.

The profile of the outer shell consists in the form shown here of quadrangular elements. The Indian 1 shown construction can be done both by a winding and by pushing together outer shell and smooth inner tube. An outer insulation, not shown here, may be provided to thermally insulate the entire assembly from the environment.

2 shows an off-scale perspective view of a pipe section in a partial section. The profiled outer shell has a triangular profile in this embodiment. Through this profile form are channels 1a formed in a triangular cross-section. The directional arrows refer to a respective flow direction of a flow channel 3 and an associated return channel 4 , The one with the reference number 5 designated pitch angle 8th The helical shape varies depending on the number of each several times side by side laid forward and return flows and the respective pipe dimension and distances of the heat exchanging channels and can be in the range between 0 ° and 180 °, except 90 °. The forward and the return form a functional unit, which is formed in the example shown here as a double helix. The double helix winds helically around the tube's longitudinal axis.

How out 2 can be seen further, the respective channels are arranged spaced apart by the profile shape of the outer shell and do not touch each other. The forward and the return of the double helix stand therefore only with the wall of the inner tube 2 and the medium therein, but not in thermal contact with each other.

3 shows a further exemplary pipe section in a partial section. The profiled outer shell here has a profile shape, through the channels 1b be formed with a rounded shape. Again, two channels are combined into a double helix with a forward and a return.

A big advantage of the in the 2 and 3 shown double helix geometry compared to a single helix is that the respective connection openings of the supply and return can be arranged adjacent to each other, ie side by side on the double helix but also at a ansich anywhere on the pipe. This is not possible with the single helix. There, due to the linear, non-looped leadership of the Medi In order to be used in the channels only only areas on the opposite ends of the pipe for the terminals.

Furthermore is a most effective heat removal or but a targeted temperature control possible. The heat exchanging Work equipment can be both laminar and turbulent the channels flow through.

4 shows a further exemplary pipe section in a partial section. The profiled outer shell here has a design with which channels are formed in a quadrangular shape, each in an outer sub-channel 1c and a sub-channel located toward the inner tube 1d are divided. With such an embodiment, a simultaneous heat transfer is ensured with the environment, such as the soil, and the medium flowing through in the inner tube or in the inner sub-channel or is made possible independently.

The embodiments shown are not limited to a circular or round tube cross-section. The cross section can also be designed as a polygonal square or have round and square sections. 5 shows a selection of possible tube cross sections. The reference number 6 refers to a pipe provided with a triangular groove. A polygonal cross section, such as an octagon 7 is also possible.

The reference number 8th refers to an elliptical cross section. The right-hand section 9 represents a below rounded and above square profile in the sections underneath 10 and 11 are again a horizontal elliptical, and a flattened at the bottom circular cross-section shown.

in principle can both through the embodiments shown gaseous as well as liquid media both in the channels as well as in the inner tube are performed. amendments the state of aggregation, in particular evaporation or condensation processes of the medium within the channels as well as the medium in the Inner tube are readily feasible.

The heat exchanging pipe can be used both as a pressurized, as well as non-pressurized line device in a fully and partially filled state be used. In addition, through the selective discharge or entry of energy through the channels Even lines are specifically tempered. The energy production or Temperature control is independent of the medium in the inner tube or allows the channels. It can both transported laminar or turbulent flowing media and be tempered at the same time. Furthermore, the connected Heat exchanger connected at one point and can be according to requirements in length as well be varied in the flow. Regardless of the transported Media is next to a withdrawal from the surrounding soil possible.

By the stabilizing / supporting effect of the profiled Outer shell, the pipes are resistant to dynamic load, such as during installation, as well as static Burden.

The heat transfer tube can be dependent of the material used or of the intended use both as a flexible, wound on drums endless and / or in shape flexible or rigid segments with prefabricated lengths available. For this case, the individual Segments welded or by fittings or Muffs be connected. The channels, especially the ones out become them formed double or multiple helix of the individual segments when joining either cohesively, for example via a welded joint, joined together or through Connecting means, in particular fittings or sleeves, plugged together, wherein the helix runs continuously over several segments in one defined length extends.

The Channels may be formed as a circuit. The forwarding takes place via connections to each other coupled segments. At the end of a projected route for energy recovery are the channels of the flow and return by means a connection in a reversing element coupled to each other closes the cycle. By forming this cycle, which is similar to a tube scale, can Flow and return of at least one heat exchanger be supplied. In addition, you can also two or more individual pipe segments by means of a parallel connection be coupled with each other. An energetic use of the heat transferring Tube for the temperature control of media in the context of thermal absorbers, for example solar thermal collectors or geothermal plants, is by realizable.

Further Embodiments emerge from the subclaims and by appropriate modifications in the context of professional action.

1

outer shell

1a

Channel, triangular shape

1b

Channel, rounded shape

1c

Subchannel, Outside

1d

Subchannel, Inside

2

inner tube

3

forward channel

4

Return channel

5

lead angle

6

pipe with gutter

7

pipe in octagonal cross-section

8th

pipe with elliptical cross-section

9

pipe with rounded and partly angular cross-section

10

pipe with lying elliptical cross section

11

pipe with circular and partially flattened, rectilinear cross-section

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• - DE 3244600 C2 [0003]
• - DE 4202791 A1 [0005]
• DE 19719311 A1 [0007]
• - DE 202005013590 U1 [0008]
• - DE 202004018084 U1 [0010]

Claims (14)

Heat-transferring tube, characterized in that it consists of an inner tube ( 2 ) is arranged around the helically at least one circumferential channel ( 1a ), wherein windings of the channel are spaced from each other. Heat-transferring tube according to claim 1, characterized by an at least in segments double-walled construction of at least one profile provided with an outer shell ( 1 ) and an inner tube ( 2 ), wherein the outer shell ( 1 ) on the inner tube ( 2 ) is applied so that between the outer shell and the inner tube with respect to the pipe longitudinal axis at least one helically extending channel is formed. Heat transfer tube according to one of claims 1 or 2, characterized in that two or more circulating channels ( 1a . 1b ) surround the inner tube helically, wherein the channels form a wound around the tube longitudinal axis double helix or multiple helix. Heat transfer tube according to one of the preceding claims, characterized in that at least one channel has an internal division into at least one outer outer sub-channel ( 1c ) and located in the direction of the inner tube inner sub-channel ( 1d ) having. Heat transfer tube according to one of the preceding claims, characterized in that pipe end-side formations and / or connecting means for coupling channels ( 1a ) Coupled pipe segments are provided. Heat transfer tube after a of the preceding claims, characterized in that as connecting means a fitting or a sleeve is provided. Heat transfer tube according to one of the preceding claims, characterized in that the inner tube ( 2 ) and / or the channels are weldable. Heat transfer tube after a of the preceding claims, characterized in that at least one flow direction not via the helix, especially the multiple helix, is guided. Pipe according to one of the preceding claims, characterized in that the multiple helix at least one flow channel ( 3 ) and at least one return channel ( 4 ) having. Pipe according to one of the preceding claims, characterized in that a couplable to the tube reversing element for connecting a flow channel and a return channel the multiple helix is provided. Pipe according to one of the preceding claims, characterized in that a the outer shell surrounding insulation is provided. Process for the preparation of a heat-transferring Pipe according to one of the preceding claims, With one of the following process steps: - Complete the inner tube with the profiled outer shell, - Produce a firm connection between the inner tube and the outer shell, - welding of extruded profiles, - winding one not self-supporting tube around the given inner tube. Process for the preparation of a heat-transferring Pipe according to one of claims 1 to 11, containing the process steps - Make at least one tubular profiled outer shell, - Insert an inner tube in the profiled outer shell, - Produce a firm connection between the inner tube and the outer shell. Process for the preparation of a heat-transferring Pipe according to one of claims 1 to 11, with the following Step: - making a re the tube longitudinal axis around the inner tube helical running channel or a multiple helix in the form of a loose winding.