DE2949584A1 - Underground heat store with ground heat collector - comprises concrete tank containing sand or water covered over with soil for landscaping - Google Patents

Abstract

The store is used for the heat energy supplied by solar collectors or absorbers and simultaneously acts as a collector for the ground heat. It comprises a tank inserted in a ground pit with a concrete bed (14) overlaid by a water-tight elastomer skin (4) and containing sand or water acting as the heat storage medium (9). A series of pipes (10) carrying the heat transfer fluid are embedded in the heat storage medium (9) to transfer heat to it from a solar collector etc. and to transfer heat from it to a heat pump or underfloor heating system. The surface of the heat storage medium (9) is covered by a heat insulation layer (2) comprising a number of superimposed layers over which the soil etc. is replaced.

Description

EARTH HEAT STORAGE AND GEOTHERMAL HEAT COLLECTOR WITH INCREASED PERFORMANCE

DESCRIPTION

The invention relates to an underground storage facility for thermal energy, those from solar collectors or solar absorbers (see g. Energy roofs), whereby the storage structure can also be used as a geothermal collector. The inventive Compared to other known systems, the system has a increased performance, which is evident when using them as geothermal heat storage occurs in the form of a larger storage capacity, and when used as a geothermal collector a results in a larger amount of collected thermal energy, especially in the cooler season. Both types of use are also possible one after the other, By using a system that is mainly operated as a heat storage system, after the thermal energy stored in it has been used up, at lower Temperature level can continue to work as a geothermal collector.

Geothermal heat storage and geothermal collectors are known a pipe register laid in the ground. A liquid working medium, the thermal energy from solar collectors, flows through the pipe register or from solar absorbers and bring them to a Acceptance point in the house in the form of, for example, underfloor heating or a Heat pump dissipates. The working medium can also absorb the thermal energy present in the ground and transfer it to a heat pump. These systems have the disadvantage that they have only limited storage capacities as heat accumulators and as geothermal collectors Provide only moderate amounts of heat, - if they are accommodated on the usual and limited-size house plots. These systems are unsuitable as long-term heat storage and are hardly sufficient as short-term storage for bridging periods of cooling weather off in spring and autumn; and as geothermal collectors provide almost no energy in winter,

130024/0597

Herbert Kaniut Blatt

Orrerweg 33 - ~

5000 Cologne 71 - ^ - 2949584

In order to improve this, the inventor has set himself the task of creating an improved design for a geothermal heat storage and a geothermal collector, which while maintaining the previous overall dimensions, an increased heat storage capacity and an improved geothermal collection capacity up to dje wintertime would have.

This object is achieved according to the invention in that a geothermal heat storage and Geothermal energy collection system is created, which has a heat insulation layer arranged horizontally above the system, and the under the system a container made of elastomeric film owns. The heat insulation layer over the system serves to provide a Prevent heat loss upwards, increasing the thermal energy storage capacity generally increased, and in addition the geothermal energy collection is improved in winter. The container made of elastomer film under the system has the task of removing the moisture in the container Spetchermass of the heat storage, which essentially consists of sand and There is water to hold together and to prevent the migration of components of the storage mass. The moist storage mass has a higher heat storage capacity than dry sand, and results in improved thermal conductivity within the mass. To one more to achieve a further increase in the capacity of the heat storage system, if the storage mass is a suitable crystalline salt or a salt composition, Consists of several types of salt, mixed in. The pipe register for the liquid working medium is in the storage mass installed, which is largely branched in order to capture the entire storage mass on the shortest possible heat conduction paths.

The invention is illustrated by means of two, in the accompanying drawings illustrated embodiments explained in more detail.

F IG. 1 shows a vertical section through the ground and the geothermal heat storage / geothermal collector according to the invention, the right side of FIG. 1 a sand-water reservoir, and the left side of FIG. 1 represents a sand-salt-water reservoir.

130024/0597

Herbert Kaniut Blatt

Orrerweg 33 - Γ

5000 Cologne 7i ^ 2949584

FIG. 2 illustrates in a vertical section through the ground and through the storage / collector system according to the invention, the courses of the natural and the temperature gradients modulated by the horizontal heat insulation layer, and the areas of heat storage and geothermal heat collection.

In the drawings, like reference numerals indicate like parts. It means :

1. Earth's surface;

2. Horizontal heat insulation layer over the geothermal heat storage / geothermal collector, which is below the earth's surface;

3. Soil in vertical section;

4. Container, consisting of a bowl-shaped laid and watertight welded elastomer film;

5. T-shaped elastomer profile;

7. Sieve basket in the shape of a bell, with a laterally protruding base plate;

8. tube with cylindrical expansion and flange at the upper end;

9. Storage mass consisting of sand and water, with and without admixture of salt;

10. Pipe register for the working medium;

11. Heat-insulated inlet and outlet pipes of the IQ pipe register. The supply line is e.g. connected to the solar collector or the solar absorber, while the drain line leads to the underfloor heating or to the heat pump;

12. Edge profile made of plastic, for example, which has an L-cross section with an acute angle and two bent end pieces;

13. Supporting the pipe register;

14. A bowl-shaped lean concrete bed under the container 4 made of elastomer film. The bowl shape is preferred for the concrete bed and container 4;

15. Course of the natural temperature gradient in the upper soil in summer;

16. Course of the natural temperature gradient in the upper soil in summer when the cold snap;

130024/0597

Herbert Kaniut Blatt

Orrerweg 33 ~ J

5000 COLOGNE 71

17. Course of the natural temperature gradient in the upper soil In the winter;

18. Course of the terriperature gradient modulated by the horizontal thermal insulation layer 2 in winter;

19. Area of tier heat utilization of the storage facility;

20. Temperature gradient of the charged heat store;

21. Temperature gradient of the discharged heat accumulator;

22. Area of geothermal energy collection in winter;

23. Cover made of elastomer film;

24. control shaft;

25. control thermometer;

26. Heat-insulated inlet and outlet lines of a second pipe register.

The geothermal heat storage and geothermal collector according to the invention is created in a bowl-shaped depression FlG.1. A lean concrete bed 14 covering all surfaces is first placed in the depression created that a T-shaped elastomer profile 5 received in order to prevent damage to the elastomer film 4 in the event of any subsequent settling movements of the concrete parts. On the lean concrete bed an elastomer film is laid, which forms the container 4, the cut edges of the film being welded, and the upper edge of the film is attached to an edge profile 12 running around the container. In the lowest point of the container 4, a sieve basket 7 is set up, which has an upwardly leading tube 8 which carries a widening and a flange at the upper end. In the foil container With the help of the supports 13, the pipe register 10 is laid for the working medium. The pipe register has an inlet and an outlet line 11, which are passed watertight through the foil wall of the container 4, which are thermally insulated outside the storage / collector system, and which bring in and discharge the liquid working medium. The supply line brings the material obtained above ground or in some other way Heat energy in the geothermal heat storage, and is e.g. connected to the solar collector or the solar absorber, while the drain line takes the heat energy from the storage or from the geothermal collector and is connected, for example, to underfloor heating or to a heat pump.

1 30024/0697

Herbert Kaniut Blatt

Orrerweg 33 - O -

5000 COLOGNE 71

Two pipe registers are required for an alternative design of the system provided in the geothermal heat storage, one of which register as an independent Circuit e.g. only with the solar collectors or the solar absorbers is connected to 11, while the second register is connected as a second independent circuit, e.g. only to the heat pump In the container 4 made of elastomeric film, sand is filled, and with

ρ
Washed in water. The flushing in results in a better setting of the sand between the pipe registers and the desired moistening of the storage mass 9.

The second embodiment of the geothermal heat storage according to the invention, which has an even further increased heat capacity, receives a storage mass 9, which is made of sand, a suitable crystalline salt or a salt composition mixed with several types of salt and water.

Then the storage mass 9 is essentially horizontal Laying heat insulation layer 2, which consists of one or more Layers of e.g. closed-cell plastic foam, one on top of the other. In the area of the insulation layer is also the arranged expanded portion of the tube 8, in the bottom Control thermometer 25 for the temperature of the storage mass 9 and other measuring devices are arranged, and wherein the flange of the pipe expansion rests on the insulation layer 2. Is on this flange the cover 23 made of elastomeric film is screwed on with the aid of a clamping ring. However, the cover 23 is only used for the second embodiment the storage system, which contains a salty storage mass has considered necessary to prevent rainwater from seeping through the horizontal thermal insulation layer 2 and from overflowing to avoid the salty water of the storage mass 9 over the edge profiles. Is on the insulation layer 2 or the cover 23 The control shaft 24 is essentially concentric with the pipe 8 on top, and the geothermal heat storage / geothermal collector completed in this way covered with earth.

130024/0597

Herbert Kaniut sheet fi

Orrerweg 33 ^ Ί OQ / QCO /

5000 Cologne 71 - '- 2949584

For repair work in the area of the pipe register 10, for which the Removal of parts of the thermal insulation layer 2 and the storage mass 9 are required, the water or the salty beforehand Solution of the memory sucked through the pipe 8.

The temperature conditions in the geothermal heat storage according to the invention and geothermal collectors illustrate the F IG.2. The working medium flows through the pipe register 10, which is arranged within the storage mass. The area of heat utilization is 19, which is even with a cold snap hardly changed in the warmer seasons, 2 between the gradient 20 = "memory charged" and the gradient 21 = "memory discharged". The natural, i.e. the outside the system according to the invention, the temperature gradient in the upper Soil in winter time 17 is covered by the horizontal heat insulation layer 2 and the geothermal energy acting from below is modulated 18 so that it is substantially above freezing point within the system. This makes it possible to use the system according to the invention in winter to be used as a geothermal collector, and also after the discharge of a system that is mainly operated as a geothermal storage system to use the geothermal energy in the area 22.

This analysis is based on the fact that the bowl-shaped substructure of the system made of lean concrete 14 and elastomer film 4 does not have any Significant heat transfer resistance is generated, so that the temperature conditions prevailing below the system move upwards continue in the storage mass 9, and conversely the temperature conditions in the storage mass and the underlying soil influence.

In summary, the heat accumulator according to the invention can be produced relatively inexpensively, since it only has an upper heat insulation layer required, compared to other heat storage constructions that have to be thermally insulated on all sides. Then it lies in the ground

130024/0597

- AO-

Herbert Kanlut sheet

Orrerweg 33
5000 COLOGNE 71

embedded, which makes a special support construction unnecessary; and its structure consists essentially of concrete, elastomer film, Sand, water, and foam boards that are easy to get hold of. Finally, the ground above the heat storage can be used for horticultural purposes, so that there is no loss of green space.

The layout arrangements shown in the accompanying drawings and the components specified in the description are only exemplary and are not intended to limit the spirit of the present invention.

130024/0597

AA-

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Claims (6)

- 29Α958Α PATENT CLAIMS 1. Underground storage for thermal energy, in particular for storing in solar collectors or solar absorbers obtained thermal energy is determined, and which can also be used as a geothermal collector, characterized in that that the Erd-Wärmespelcher / geothermal collector from novel and conventional components is combined and essentially the following construction groups includes: a) a container in a depression in the ground, that consists of a bowl-shaped lean concrete bed or concrete bed (14) with a bowl-shaped laid and waterproof welded elastomer film (4) therein, the bowl shape being a preferred shape, b) a storage mass (9), which is accommodated in the above-mentioned container, and which consists essentially of sand and Water consists c) one or more pipe registers (10) for the liquid working medium, which are laid and embedded in the storage mass (9) and which on the one hand are connected to the heat sources such as solar collectors or solar absorbers, and on the other hand to heat-consuming devices such as heat pumps, underfloor heating, etc. are connected, and 130024/0597 Herbert Kaniut ^ sheet Orrerweg 33 - J ^ _ OQ / QCO / Cologne 7i 2949584 (Continuation of claim 1) d) an essentially horizontally lying thermal insulation layer (2) with which the storage mass (9) is placed on its entire surface is covered, wherein the heat insulation layer can also consist of several superimposed partial insulation layers, and the insulation layer is arranged in terms of elevation so that it lies below the surface of the earth, and where the use of the system as a heat storage and as a geothermal collector can also take place one after the other, by using a system that is mainly operated as a heat storage system after the thermal energy stored in it has been used up, can continue to be used as a geothermal collector at a lower temperature level. 2. Geothermal heat storage and geothermal collector according to claim 1, characterized in that the storage mass (9) besides sand and water also has a suitable crystalline Salt or a salt composition consisting of several types of salt, and the upper heat-insulating layer (2) with a full-surface cover (23) made of elastomer film is provided on the insulation layer. 3. geothermal heat storage and geothermal collector according to claim 1 and 2, characterized in that the elastomer film of the container (4) attached with its upper edge to an edge profile (12) made of plastic running around the container is, which has an L-cross section with an acute angle and two bent end pieces. 4. geothermal heat storage and geothermal collector according to the preceding claims, characterized in that A bell-shaped strainer basket (7) with a laterally protruding base plate is arranged at the lowest point of the container (4), 130024/0597 Herbert Kaniut BJaJL Orrerweg 33 _3_ 2949504 COLOGNE 71 (Continuation of claim 4) which at its highest point has an upwardly extending and essentially vertical tube (8), which at its upper end carries an essentially horizontal ring base, on the circumference of which an upwardly extending cylindrical tube widening begins, which in the area of the insulation layer (2 ) lies, and a flange is arranged at the upper end of the pipe widening; and wherein a control thermometer (25) for the storage mass and other measuring devices are placed in the horizontal ring base of the pipe expansion. 5. Geothermal heat storage tank and geothermal heat collector according to the previous ones Claims, characterized in that the flange according to claim 4 for fastening and sealing the cover (23) according to claim 2 is used, and that on the Insulation layer (2) or a control shaft on the cover (23) (24) is put on. 6. Geothermal heat sink and geothermal collector according to the previous ones Claims, characterized in that individual parts or structural groups of the system, or partial combinations of the system for storing thermal energy or for generating geothermal energy can also be provided. For this purpose 2 sheets of drawings 130024/0597