WO2016169888A1

WO2016169888A1 - Solar installation, heat reservoir, and a method for generating power

Info

Publication number: WO2016169888A1
Application number: PCT/EP2016/058538
Authority: WO
Inventors: Reinhard Kühling
Original assignee: Reinhard Kühling
Priority date: 2015-04-18
Filing date: 2016-04-18
Publication date: 2016-10-27
Also published as: DE102015004989A1

Abstract

The invention relates to a solar installation comprising at least one solar collector (10). Each solar collector (10) comprises a mirror device (14) that collects and reflects sunlight incident thereupon. Each solar collector (10) comprises at least one absorber device (13) that absorbs sunlight reflected from said mirror device (14). Each solar collector (10) additionally comprises a heat reservoir (12) which can be separated from and reconnected to said solar collector (10), and which is connected to the absorber device (13) in a thermally-conductive manner when in the connected state.

Description

SOLAR PLANT, HEAT STORAGE AND

METHOD FOR ENERGY PRODUCTION

TECHNICAL AREA

The present invention relates to a solar system according to the preamble of claim 1. The invention further relates to a heat accumulator having an outer housing and a housing received in an interior of the outer housing block.

Furthermore, the invention relates to a method for generating energy according to the preamble of claim 13.

PRIOR ART In the use of solar radiation for energy production, two basic technologies have developed. In solar cells, solar radiation is converted directly into electrical energy. With an efficiency of less than 20% for applications (www.solarserver.de), the yield is low, especially as energy production ends with the sunsets. The storage of electrical energy is not very effective, which further reduces the efficiency of such a system.

Solar panels convert the sunlight into heat. Very popular is the heating of heating and utility water in Hauehalten or the water of swimming pools. To generate electrical energy or higher process heat, the sun's rays are first concentrated and then possibly transported to the power generator.

For the concentration of sunlight, there are three common types: solar towers, parabolic troughs and parabolic mirrors. In solar towers, sunlight is focused directly or indirectly from independent mirror surfaces onto a concentrator that generates, for example, steam that can be used to power a turbine (Ivanpah (US); Solarplant (Sevilla (ES) [www.planet-wissen Since the temperatures are quite high, such plants have a high degree of efficiency, and such a direct conversion of the heat into electricity has the disadvantage that as a rule there are no storages which store the energy for times where the sun does not shine.

Parabolic trough collectors are designed so that the sunlight is focused on one line. An absorber is introduced into this line, which collects solar energy. If parabolic trough collectors are placed in a row, a pipe can be laid through the respective focus lines and an absorber medium pumped through the pipe. Depending on the design, this medium can be water, as described in DE 10 2012 107 353 Al and DE 10 2013 101 648 AI. It is also possible to use thermal oil or a molten salt mixture, as disclosed in DE 10 2012 103 457 A1. DE 10 2010 023 843 A1 and DE 10 2010 055 997 A1 describe air and other gaseous heat carriers as absorber media. DE 10 2008 048 655 A1 discloses a type of pneumatic tube system for storage elements. The storage elements contain absorber layers so that they heat up when passed through the focal line of a parabolic trough collector. The memory elements are relatively small because the memory element has to be transported through the pneumatic tube.

The absorber medium is pumped through the pipes and fed to a steam generator with which a turbine is then driven. In addition to direct power generation, heat storage systems are also used in the systems, which are charged during the sunshine hours in order to make electricity generation possible at a later date. Thus, DE 10 2010 055 997 A1 describes a storage medium made of stone, gravel and / or sand, through which the absorber medium air is passed and charges the memory. At a later point in time, the stored heat can be collected by passing air through the storage material again.

DE 10 2012 211 917 A1 describes various eutectoid mixtures which can be used as heat storage media. In this case, nanoparticles are added to the storage medium, which allows the flowability of the storage medium to close to the melting point. DE 10 2013 211 249 AI describes thermochemical storage in which the heat is stored in reversible chemical reactions. The DE 10 2007 059 617 A1 discloses a reservoir whose storage medium is salt held in a steel container, which is melted and releases the energy during the recrystallization.

The disadvantage of parabolic trough collectors is that the absorber medium, which has a higher temperature than the environment, must be transported in insulated pipes. For solar systems with up to 50,000 collectors, the lines are quite a few tens of kilometers long.

Compared to the two types mentioned above, the parabolic level has been neglected. The parabolic mirror does not work as effectively as the solar towers, because the collection area is smaller and therefore not so high temperatures are reached. Likewise, no transport tube for absorber media can be placed, since the focus is a point and not a line and thus the heat input is too low. DE 10 2009 022 557 A1 describes a parabolic mirror in which the mirror is divided into individual flat surfaces. The surfaces are mounted on a single support plate with an angle of attack so that they all reflect the incident light onto an absorber surface which is slightly larger than the individual mirror surface. This makes the construction of the reflector a lot easier. The absorber is formed by the heater of a Stirling engine, which converts the heat into kinetic energy with which, for example, a current generator can be driven. To increase the efficiency, it is proposed to use a mirror surface of 500 m * per Stirling engine, which is a stable supporting framework for Mirror and Stirling engine required. This makes such a system cumbersome.

DE 10 2012 000 209 AI discloses a solar collector with permanently installed memory. Upper heat exchanger is heated water and fed to the use. If the collector does not provide enough energy, the energy can be fed from another source. DE 10 2007 035 384 A1 discloses a stationary storage device which is heated by means of lens collectors and absorbers and, if required, the energy is supplied to a heat exchanger via a controllable heat bridge. DE 10 2009 010 358 A1 discloses a heat transport system in which the heat which has somehow been collected in an absorber vessel is transferred to latent heat storage. Since this must be a continuous process, the memory sizes are specified with a maximum of 500 cc. Since the heat absorption and Abgäbe via the wall, the heat storage can not be isolated.

THE INVENTION

The object of the invention is to make available a solar system, a process for generating energy and a suitable heat storage device by means of which complex and expensive tube conveying systems for absorber media are avoided and which are relatively simple and inexpensive, so that they can also be used in developing countries.

The object is achieved by a solar system with the features of claim 1. Furthermore, the object is achieved with a heat storage with the features of claim 8 and by a method for generating energy with the features of claim 12. Advantageous embodiments are described in the subclaims.

According to the invention, a solar system has at least one solar collector, each solar collector having a mirror device which collects and reflects sunlight incident thereon, each solar collector having at least one absorber absorbing sunlight reflected by the mirror device, each solar collector further comprising one of the solar collectors Solar collector has separable heat storage, which is in the connected state in Wärmeleitverbindung with the absorber bereinrichtung.

The mirror device can in particular be designed as a parabolic mirror, or as a mirror device with a point focus. The absorber device is then preferably arranged in the focus of the mirror device, so that it can absorb maximum concentrated sunlight.

The heat accumulator is preferably detachably connected to the collector, so that it is separated from the collector, in particular by the collector. Sorber can be separated and re-attached to this preferably immovable or can be mounted.

With a removable heat storage, solar energy can also be used when the sun is not shining. For example, the separated heat accumulators can be supplied to a central recycling point, such as an electricity generating plant. Transport can take place with vehicles whose technology and infrastructure have long been known and are also used in developing countries. With such an arrangement, there is no need for a kilometer-long pipeline system between individual solar collectors and a recycling center. Especially since the lines would have to be provided because of sun tracking with joints. Furthermore, such lines would have to be insulated so that the collected energy is not lost at least partially during transport. Depending on the heat transfer medium used, a pressure line would also have to be installed, or if a liquid metal is used to achieve high temperatures of the medium, an emergency heating system would have to be installed so that the heat transfer medium would not solidify in the absence of sunshine and the transport lines makes it useless. A simple transport system with separable heat accumulators can also be used where maintenance reliability is not always available.

In order for the reflected rays to always hit the absorber device, the sun should always have the same position relative to the mirror device. Preferably, the Spiegelvorrichtving the sun tracked. In a preferred embodiment, the mirror device is dual-tracked to the sun, both after the day's run and according to the seasonal position of the sun. The arrangement of the axes of rotation is in principle arbitrary, but two systems have been found to be preferred. One of the preferred embodiments has a vertical axis of rotation on which a second axis of rotation perpendicular thereto and running in the horizontal direction is arranged. In this advantageous embodiment, the load distribution can be well balanced. Preferably, the center of gravity of the solar system is arranged on the vertical axis of rotation, so that no additional loads have to be absorbed by the movements. In this embodiment, the azimuth is controlled by the vertical axis of rotation and the elevation by the horizontal axis of rotation. Both rotational movements must be coordinated in this embodiment, if they follow the course of the sun. In a second preferred embodiment, the axis of rotation anchored in the ground is not vertical, but it runs parallel to the axis of rotation of the earth; The second axis of rotation, with which the seasonal position of the sun is set, is perpendicular to this axis. Within the bounds of accuracy, it is sufficient if the declination, the seasonal position of the sun, is set every day. The solar system then follows the daytime course of the sun solely by the rotation of the axis parallel to the axis of rotation of the earth. This makes the control of the system very easy. The solar system can be operated with a solar collector, if the collection of heat and their use in time and / or space to be separated. In the case of a solar system with several solar collectors, the acceptance / replacement of the separable heat storage must be organized and an infrastructure created for the transport. In the case of small installations, it may be sufficient to use a tractor with two / three trailers for transporting the heat accumulators removed from the solar collector. For medium-sized or even larger plants there are logistical problems. The number of teams is increasing and the process is becoming more confusing and time-consuming. For larger and larger solar systems, it may be advantageous to arrange the solar panels in at least one row, with a rail arrangement being guided along each row. The friction of rail-bound vehicles is very low compared to non-rail-bound vehicles, so that significantly more loads can be moved with the same energy consumption. Thus, with a rail arrangement with the same energy expenditure, a larger number of solar collectors can be operated. In a preferred embodiment, for this purpose, the system has arranged on the rail arrangement movable Untersät- ze, which are adapted to each at least one of the heat storage to receive and transport. In a further preferred embodiment, the mobile pedestal is designed for one heat accumulator each. The transport network is thus very variable. subdivided and can for example be adapted directly to the length of a row of solar panels. In a further preferred embodiment, a mobile subset is designed to accommodate a plurality of heat accumulators. As a result, for example, the number of axes in a composite is reduced, thereby reducing friction. With a rail arrangement, the distance from a transport vehicle to a solar collector is predetermined and reproducible. Thus, the collection of the heat storage can be automated much more in such a system.

The heat accumulators are supplied to a power plant to use the stored heat. In an advantageous embodiment, the solar system has a power station connected to the rail arrangement. In the power plant, for example, the heat from the heat accumulators can be fed into a steam generator, the steam being used to drive a turbine to generate electricity. In a preferred embodiment, in the solar system, the ratio of solar collectors and turbine power is designed so that the amount of heat harvested is sufficient to operate the turbine for 24 hours. In a particularly preferred embodiment of the solar system, the amount of heat harvested is suitable for operating the turbine for 48 hours, in order to be able to bridge bad weather phases. In another particularly preferred embodiment, the amount of heat harvested is capable of operating the turbine for well over 48 hours. The emptied heat accumulators are transported back to the solar collectors and reconnected to them. It makes sense to use a vehicle that couples the heat storage to the solar panels. In the preferred embodiment with the rail arrangement, it makes sense if the solar system has at least one rail vehicle which is designed to receive the heat storage from the solar panels and / or to transfer to the solar panels. The hanging of the heat storage to the solar panels can be done as described above. However, it is also possible to drive the rail vehicles with emptied heat accumulators to the solar collectors and to replace the filled heat accumulators with an empty one again. This procedure would be particularly advantageous if an exchange of the heat storage would take place during the course of the day. By this procedure, the decommissioning of the solar collector by the replacement of the heat storage is short. In a preferred embodiment, the heat accumulator is designed to be able to store the amount of heat collected by the collector to heat. Thus, the replacement of the heat storage is postponed to the time after sunset and it leads to no downtime of the collector by replacing the heat storage.

In a preferred embodiment, the heat exchanger is replaced after sunset. For this purpose, the solar collector can be pivoted into a top feed or receiving position so that the heat accumulator is located in the region of the rail arrangement and there by a rail vehicle or can be transferred from this to the solar collector. The longer a transport network becomes, the more difficult it becomes for a work machine that performs the transfer of the heat accumulators from or to the solar collector to be integrated in the transport network. With a solar array of, for example, 50 solar collec- tors or even more, the boom of the working machine has to be made large and thus very stable, so that the working machine becomes unwieldy and cumbersome. Here it is quite an advantage if the machine can move independently of the transport association. In a preferred embodiment, a rail arrangement is guided parallel to the rail arrangement for the transport of the heat accumulator, on which the working machine moves. Thus, the working machine can be placed in the immediate vicinity of the solar collector to remove the heat storage of this or attaching to this. In a further preferred embodiment, the working machine protrudes beyond the transport composite and is supported by a rail arrangement, the strand of which runs in each case to the right and left of the rail arrangement for the transport network. In such an arrangement, the machine is quite wide and thus very stable. The heat accumulator should meet a variety of boundary conditions: among other things, it should have a large storage capacity; it should be compact, so that it can be transported well; the temperature level should be high; the heat losses should be low; the price of a heat storage should not be too high. The heat accumulator should be suitable for storing the solar energy collected by the solar collector. Preferably, the storage capacity should be so large that the heat storage stores the collected solar energy of a full day, so that it can be removed only after sunset and fed to the power plant for energy. The size of the storage capacity depends on the size of the mirror device. On the one hand, the store must not have too large a volume in order not to offer, when connected to the solar collec- tor, a too large wind resistance, which would place greater demands on the stability of the support frame of the solar collector. Furthermore, a compact design of the heat storage also means a small footprint of the heat storage during transport to and from the power plant.

It is known from thermodynamics that the higher the temperature difference of a working gas before and after the work machine, the higher the efficiency of the working machine. The aim of the heat accumulator should be to maintain the stored heat quantity at a high temperature level. A preferred temperature range is between 400 and 1200 ° C, a particularly preferred temperature range is between 600 and 1000 ° C, a most preferred temperature range is between 700 and 950 ^e C. At such temperature ranges, the heat loss to the environment is high. In addition to the heat radiation, convection will lead to a cooling. Air will heat up and rise on the memory block. The rising air draws in more air so that a cooling flow builds up. Even contact with other materials will lead to heat loss. Here it is advantageous to shield the actual heat block from the environment and put in a shielding housing. The convection in the housing is thereby suppressed by evacuating the housing. At large temperature differences, the heat radiation has a large share of the heat loss. This can be reduced by one or more inner housing, as they assume an intermediate temperature and thus reduce the heat radiation to the outside. A heat accumulator according to the invention consists of an outer housing and a storage block accommodated in an inner space of the outer housing, one or more inner housings enclosing the accumulator block being provided in the outer housing, one of the housings and the outer wall of the respectively adjacent inner housing being between the inner wall a vacuum is formed.

The main function of the heat accumulator is to absorb heat, store it and release it when needed. For this purpose, the heat block must come into contact with the absorber of the solar collector in order to absorb the thermal energy, and in the power plant with the heat transport medium, in order to release the stored heat again. For this purpose, the insulation of the heat block must be broken. In In a preferred embodiment this is achieved by a heat accumulator in which the inner housing (s) and the outer housing have a common, closable opening for receiving a heat transfer element.

In an advantageous embodiment, the common opening is designed so that a wall of the opening connects the individual housing vacuum-tight. A heat transfer element, which has direct contact with the storage block on one side, is also inserted in a vacuum-tight manner into the wall. In a further advantageous embodiment, a closure between the heat transport element and the outer housing is introduced and it closes the opening during transport. Both the heat-conducting element of the absorber and a heat transport element of the power plant come into contact with the heat transport element in order to fill or empty the reservoir block.

In a preferred embodiment, the heat transport element is separated from the storage block by, for example, a spring. Only when filling or when emptying the heat transfer element is pressed against the storage block and thus establishes a Wärmeleitbrücke between the heat transfer element and the memory block. Such an advantageous arrangement of the heat loss during transport is further reduced.

The storage block must remain dimensionally stable in the heat storage even at the desired temperatures, so that in particular the shielding functions are maintained. Only materials with a melting point above the desired temperature range can be used here. There must also be a relatively good heat conduction of the material in order to distribute the energy evenly in the storage block. A preferred embodiment of the heat accumulator is that the storage block is formed of a metal. It has proven to be particularly economical to use iron as the storage material, since the price of iron is much lower than the price of alternative metals, which certainly have greater heat capacity. In a particularly preferred embodiment of the heat accumulator, the storage block is formed of iron. In a further preferred embodiment of the heat accumulator spacers are added between the storage block and the adjacent inner housing (s) or between adjacent surfaces in order to reduce the heat flow. In a particularly advantageous embodiment of the heat storage is designed so that the memory block is thermally separated from the surrounding inner housing by thermal separating elements.

The object is also achieved by a method for generating energy in which light reflected from solar collectors is supplied to an absorber attached to the solar collector, with each absorber on the solar collector being connected to and detachable from, transportable heat accumulator, in particular according to one of the previously described type, thermally conductively connected and the absorber due the light reflection supplied solar energy is absorbed by the heat storage.

In a preferred method, the heat accumulator is decoupled from the solar collector at a given time and transported away for further use. In a particularly preferred method, the predetermined time is shortly after sunset. In a further preferred method, the temperature of the storage block and the temperature of the absorber are measured, the time of Abkoppeine is reached when the temperature of the absorber is equal to or lower than that of the storage block. Another preferred method is that the heat storage after removal transported thermally conductively coupled with a heat transfer medium, in particular water, and heat is released from the heat storage to the heat transfer medium. A further, particularly preferred method is that the heat transfer medium is fed to a heat engine.

BRIEF DESCRIPTION OF THE DRAWINGS

With reference to the figures, the invention will be explained in more detail in Ausführungsbei games.

FIG. 1 shows a solar collector in a possible discharge position for the heat accumulator; FIG. 2 shows a solar collector in which the mirror device is oriented horizontally;

Figure 3 - shows two mobile pedestals, the at a

Transfer station are coupled to a heat transfer medium.

BEST MODE FOR CARRYING OUT THE INVENTION

Figures 1 and 2 show a solar collector 10 which is firmly anchored in the ground 20. For this purpose, a standpipe 17 is fixedly inserted into a concrete bed 21 fixed in the ground 20. In this embodiment, the standpipe 17 is vertical. About this standpipe 17 coaxially a holding tube 18 is introduced. The holding tube 18 can be selectively rotated relative to the standpipe 17. With this arrangement, the azimuth of the solar collector 10 is adjusted. On the holding tube 18, a guide tube 19 is fixed perpendicular to this fixed. In the guide tube 19, the support tube 16 is guided, which is arranged rotatably about the common axis of guide tube 19 and support tube 16. In this case, the support tube 16 is rotated relative to the guide tube 19, whereby the elevation of the solar collector 10 is adjusted.

The mirror device 14 is attached to the support tube 16 with spacers. The mirror device 14 consists of a support plate and aligned on the support plate aligned mirror tiles, which are aligned so that reflected from the mirror tiles on sunlight an absorber device 13 strikes. The absorber device 13 is fastened to the carrier plate of the mirror device 14 by a support frame 11. The detachable heat accumulator 12 connected to a heat-conducting element 40 is coupled to the absorber device 13. If, for example, a mirror device 14 with a diameter of 8 meters is used, then the absorber device 13 collects the sunlight of about 50 m ^a mirror surface. In this case, an iron storage block 70 (see Fig. 3) can reach a weight of about 1 ton or more. Therefore, the support frame 11 for the absorber device 13 must be designed to be very robust. In order to place the center of gravity of the solar collector 10 above standpipe 17 and holding tube 18, it is advantageous to equip the solar collector with at least one counterweight 15.

In FIG. 1, the solar collector 10 has been moved to the transfer position. The mirror device 14 is vertical and the absorber device 13 with the heat accumulator 40 connected via a heat-conducting element 40 is inclined to the rail arrangement 30. A transport vehicle can approach as close to the heat accumulator 12, remove it and, for example, transport it to a power plant.

In FIG. 2, the solar collector 10 is erected. In this position, the absorber device 13 is located with the detachable heat accumulator 12, which is connected via a heat-conducting element 40, above the mirror element. Device 14. FIG. 2 shows that the counterweights 15 are laterally mounted such that they do not hinder the mobility of the solar collector 10 around the standpipe 17.

FIG. 3 shows two heat accumulators 12 in section, which are coupled to a heat transport medium 50. For reasons of simplicity, the mobile pedestals 60 are only indicated as a line under the heat accumulators 12 as a support surface and coupling between the pedestals, the wheels each being associated with the support surfaces, which are likewise for the sake of simplicity stand directly on the ground 20. The mobile pedestals 60 are preferably guided on a rail arrangement 30.

The heat accumulator 12 has an outer housing 125 and, inserted in this, a series of inner housings 121, which are each spaced from each other. In this ensemble of shields of the memory block 70, shown in phantom, introduced, this memory block 70 is on lower thermal separating elements 122 and is fixed together with upper thermal separating elements 123 spaced from the inner inner housing 121 in the heat accumulator 12. The interior of the outer housing 125 is evacuated. Above the storage block 70, both the outer housing 125 and the inner housing 121 are perforated by means of a closable opening 124. At the closable opening 124, the outer housing 125 and the inner housing 125 are Housing 121 sealed so that the vacuum can be maintained.

Between the storage block 70 and the closure, a heat transfer element 80 is introduced, which creates a heat connection to the storage block 70. The heat transfer element 80 is inserted into the closable opening 124 so as to seal it when the closable opening 124 is opened. In the coupled state at the absorber device 13, the heat-conducting element 40 of the absorber device 13 comes into heat-conducting contact with the heat-transporting element 80 and thus enables loading of the storage block 80. FIG. 3 shows a heat-conducting contact between the heat transport element 80 and the heat transfer medium 50. In this figure, a heat transfer from the storage block 70 to the heat transport medium 50 is shown.

The heat accumulators are shown schematically in the figure, with the memory block with the dividing elements not being shown for the sake of simplicity in the case of the right heat accumulator. The heat storage 12 according to the invention can be embodied in any desired form. It has proved to be advantageous to design the heat accumulators 12 in a cuboid shape. With this shape, the space between the individual heat accumulators 12 during transport and / or during storage is low and there is less heat loss. It may also be advantageous to carry out the heat accumulators 12 in a cylindrical shape, which reduces the heat radiation. reduced surface of the individual heat storage 12 reduced.

The examples shown in the figures are only exemplary embodiments and do not imply any limitation of the embodiments according to the invention.

The solar systems according to the invention are robust, stable and constructed with simple technology. Since the heat storage and the required transport routes can be designed simply and inexpensively, such solar systems are also suitable for developing countries and can help to cover the energy requirements in these areas. The stored energy can not only be used to generate electricity, but also, for example, for cooking, showering, heating rooms and / or as process heat for industry. The versatile use of such solar systems is underlined by their variable size. These range from individual home appliances to up to 30,000 or even more units, which are intended for example for the central energy supply of a region.

Claims

PATENT CLAIMS:

1. Solar system with at least one solar panel

(10), wherein each solar collector (10) has a mirror device (14) which collects and reflects sunlight irradiated thereon, each solar collector (10) having at least one absorber device (13) provided by the mirror device (10). 14) absorbs reflected sunlight,

characterized,

that each solar collector (10) furthermore has a heat accumulator (12), which can be separated and reconnected by the solar collector (10), which in the connected state is in thermal conduction connection with the heat accumulator

Absorbereinrich- direction (13) is.

2. Solar system according to claim 1,

in which the solar collector (10) is a collector with point focus, in particular a parabolic mirror collector.

3. Solar system according to claim 1 or 2,

characterized,

the mirror device (14) is biaxially trackable in the sun.

4. Solar installation according to one of the preceding claims,

further comprising a plurality of arranged in at least one row solar panels (10), wherein along each row is guided along a rail arrangement (30).

5. Solar system according to claim 4,

characterized,

the plant further comprises a power plant connected to the rail arrangement (30).

6. Solar installation according to one of claims 4 or 5,

characterized,

in that it comprises at least one rail vehicle which is designed to receive the heat accumulators (12) from the solar collectors (10) and / or to transfer them to the solar collectors (10).

7. Solar system according to one of claims 4 to 6,

characterized,

in that the installation has mobile pedestals (60) arranged on the rail arrangement (30) and designed to receive and transport respectively at least one of the heat accumulators (12).

8. Solar system according to one of claims 4 to 7,

characterized,

in that the solar collector (10) can be pivoted into a transfer or receiving position so that the heat accumulator (12) is located in the region of the rail arrangement and can be picked up by a rail vehicle or transferred therefrom to the solar collector (10) ,

9. heat accumulator (12), with an outer housing (125) and a in an interior of the outer housing (125) received storage block (70), wherein in the outer housing (125) one or more of the storage block (70) enclosing (s ) Inner housing (121) is provided, wherein between the inner wall of one of the housing (125, 121) and the outer wall of the respective adjacent inner housing (121) and between the inner inner housing (121) and the wall of the storage block (70) has a vacuum is trained.

10. heat accumulator (12) according to claim 9,

characterized,

in that the inner housing (121) and the outer housing (125) have a common, closable opening (124) for receiving a heat transport element (80).

11 .. heat storage (12) according to claim 9 or 10,

characterized,

in that the storage block (70) is formed from a metal, in particular iron.

12 .. Heat storage (12) according to any one of claims 9 to 11, characterized

the storage block (70) is thermally separated from the surrounding inner housing (121) by thermal separating elements (122, 123).

13. Method for generating energy, in which light reflected by solar collectors (10) is supplied to an absorber (13) attached to the solar collector (10),

characterized,

that with each absorber (13) on the solar collector (10) a transportable heat accumulator (12) which can be coupled in and out, in particular according to one of claims 9 to 12, is connected thermally conductively and the solar energy supplied to the absorber (13) as a result of the light reflection Heat accumulator (12) is recorded.

14 .. The method of claim 13,

characterized,

in that the heat store (12) is decoupled from the solar collector (10) at a predetermined time and transported away for further use.

15. The method according to claim 14,

characterized,

that the heat accumulator (12) after being transported away thermally conductively coupled with a heat transport medium, in particular water, and heat is transferred from the heat accumulator (12) to the heat transport medium.

16. The method according to claim 15,

characterized,

that the heat-collecting medium is supplied to a heat engine.