DE102007040709A1 - Geothermal probe system for providing terrestrial heat from large depth, has medium applied into area and probes that are drilled in sections of loads and towards chamber so that medium is fedback over pipes to central probe - Google Patents

Abstract

The system has a central depth probe (1) discharging a heat transfer medium (2) e.g. water, where the probe has a pre-chamber (4) provided within an end area (3). Volume of area is measured according to maximum heat flow or heat capacity of regional loads (6.1, 6.2) i.e. generators. Another set of depth probes (5.1, 5.2) and the probe (1) are directly drilled in vertical and/or horizontal sections of the loads and towards the chamber so that the medium is fedback over return pipes (7.1, 7.2) to the probe (1) during cooling of the loads. The medium is applied into the end area.

Description

The The invention relates to a geothermal probe system for use from geothermal energy from great depths, where over a pipe system a heat transfer medium in introduced a geothermally usable area and the heated or in vapor form transferred heat transfer medium above ground regional consumers.

The Development and use of geothermal energy from deep Earth formations are known, with both open, permeability from earth formations using heat circulation as well arranged in only one or interconnected deep holes Closed heat cycles have been proposed.

Of the developed, continuous heat flow is mostly on a consumer, such as a power generator out and the residual heat, for example in district heating routes, fed. An energy and heat supply tailored to the consumer and thus the defined dissipation of energy from geothermal Areas directly to consumers leave these solutions not too.

It has been suggested to use different heat demand from consumers ( DE 10 2006 012 903 B3 ), to arrange in the so-called heat receiving zone in the near-surface area several closed heat pipes of different lengths, which are bundled in a heat transfer zone aboveground connected to several consumers.

adversely is that the proposed solution, although every consumer can supply externally, but through the developable small amounts of heat with low heat potential the use only for applications with low temperature gradient such as frost protection of plants and buildings suitable.

task the invention is to provide a geothermal probe system, that with the introduction of a heatable or vaporizable heat transfer medium in the end of a subsided depth probe several near the site depth probe for regional consumers a separate, needs-based direct heat and heat removal is possible.

These Task is with the features of claim 1 and the following Subclaims 2 to 5 solved.

advantage the invention is that the regional consumers individually for she needed heat and heat one, via only one central depth probe with a heat transfer medium fed, can take antechamber. It can the delivery lines by geometrically changeable Pipe runs the optimal conditions of the consumer and his regional location for the central feed of the heat transfer medium be adjusted. The material used for the return the cooled heat transfer medium to the central depth hole can be compared to the usual Returns via, for example, district heating routes be minimized substantially.

Another Advantage is that the geothermal also from deep crystalline Rock can be obtained in large quantities. The heat transfer medium does not flow like a coaxial depth probe in the opposite direction but in dc. As a result, energy losses through thermal bridges and minimized pressure drop. The at the first central depth probe provided antechamber is also the coupling point of further, the regional consumers directly assigned depth probes. there closes the preferably star-shaped connection the further depth probes to the antechamber a thermal interaction the deep probes among each other.

By the most extensive horizontal route to the Antechamber connected depth probes, is also a significant Part of the energy present in the earth formation and led to regional consumers.

The Invention will be described below with reference to an embodiment explained in more detail. In the accompanying drawing shows

1 a section through an earth formation with a first central depth probe and two connected to an antechamber of this depth probe regional consumers

2 a schematic representation of an antechamber after 1 with a star-shaped connection of further depth probes

The geothermal probe system is made according to 1 from a first central depth probe 1 , at the deepest end 3 an antechamber 4 is provided. The lowering of the depth probe 1 and the expansion of the antechamber 4 takes place with known mining methods and facilities.

About the first central depth probe 1 gets into the antechamber 4 a heat transfer medium 2 initiated. To the antechamber 4 are two of the consumers 6.1 and 6.2 directly deepened depth probes 5.1 and 5.2 connected. The depth probes 5.1 and 5.2 are so sunk that in the depth range of the antechamber 4 a maximum horizontal distance 9 is reached. To achieve further stability of the antechamber 4 , the degradation of pressure energy in the feed of the heat transfer medium 2 into the central depth probe 1 and creating good boundary conditions in circuits and evaporation of the heat transfer medium 2 can the antechamber 4 with fissured, porous or solid rock material 8th be filled.

Are multiple consumers 6.1 and 6.2 to the antechamber 4 connected, are to control the amount of heat and temperature at the depth probes 5.1 and 5.2 Flow control valves 10.1 and 10.2 intended. Several flow control valves 10.1 and 10.2 enter into a meaningful interaction in order to influence the consumer 6.1 and 6.2 to avoid each other.

The cooled heat transfer medium 2 is by consumers 6.1 and 6.2 via return lines 7.1 and 7.2 to the first central depth probe 1 recycled.

In 2 is a star-shaped arrangement of the connection of the depth probes 5.1 and 5.2 to the antechamber 4 shown.

The mode of action of the geothermal probe system is as follows:
A heat transfer medium 2 is with known devices in the first central depth probe 1 to the antechamber 4 directed. The heat present in this area of the earth formation heats the heat transfer medium 2 so that the to the antechamber 4 connected consumers 6.1 and 6.2 according to their heat requirement and their depth probes directly assigned to them 5.1 and 5.2 the heat from the antechamber 4 can take. The cooled during consumption heat transfer medium 2 is via return lines 7.1 and 7.2 again the first central depth probe 1 supplied, so that a continuous flow process of the heat transfer medium 2 is maintained.

1

first central depth probe

2

Heat transfer medium

3

end

4

antechamber

5.1

depth probe

5.2

depth probe

6.1

consumer

6.2

consumer

7.1

Return line

7.2

Return line

8th

rock material

9

horizontal Depth probe path

10.1

Flow control valve

10.2

Flow control valve

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 102006012903 B3 [0004]

Claims (5)

Geothermal probe system for the use of geothermal energy from great depths, in which introduced via a pipe system, a heat transfer medium in a geothermal usable area and the heated or transferred in vapor heat transfer medium above ground regional consumers is supplied, characterized in that the probe system several depth probes ( 1 ; 5.1 . 5.2 ), wherein a first central, a heat transfer medium ( 2 ) introductory depth probe ( 1 ), which is in the final area ( 3 ) an antechamber ( 4 ) whose volume is determined by the maximum heat flow or heat flow of the regional consumers to be supplied ( 6.1 ; 6.2 ) and that in this antechamber ( 4 ), in vertical and / or horizontal routes from the regional consumers directly to the antechamber ( 4 ) subsided deep probes ( 5.1 ; 5.2 ) and that this is the case for consumers ( 6.1 ; 6.2 ) cooled heat transfer medium ( 2 ) via return lines ( 7.1 ; 7.2 ) to the first central depth probe ( 1 ) is traceable. Geothermal probe system according to claim 1, characterized in that the antechamber ( 4 ) of the first central depth probe ( 1 ) is a dense cavity closed to the surrounding earth formation. Geothermal probe system according to claims 1 and 2, characterized in that the cavity of the antechamber ( 4 ) wholly or partly with fissured, porous and / or solid rock material ( 8th ) is provided. Geothermal probe system according to claims 1 to 3, characterized in that the regional consumers ( 6.1 ; 6.2 ) to the antechamber ( 4 ) guided depth probes ( 5.1 ; 5.2 ) are sunk so that to the antechamber ( 4 ) a maximum possible horizontal distance ( 9 ) to the vertical deflection of the depth probes ( 5.1 ; 5.2 ) is reachable. Geothermal probe system according to claims 1 to 4, characterized in that as heat transfer medium ( 2 ) an evaporable medium, for example water, can be used.