CH687628A5 - Waermeisolierendes building and / or light element. - Google Patents

Abstract

(A) A process for producing a sealed joint between a glass surface and a metallic material involves metal coating of the glass surface by a plasma process. (B) A heat insulating construction and/or lighting element consists of two or more parallel wall elements having interposed support elements and forming an evacuatable interspace with a sealed joint at the edge region. The novelty is that the interspace is formed by a gap between the wall elements which is less than the free path length of gas molecules in the fine vacuum range of 1-10 power(-3) mbar required for cancelling heat conduction. Relative displacement of the wall elements in the edge region is absorbed by a seal. (C) A process and an appts. for prodn. of the construction and/or lighting element are also claimed.

Description

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The invention relates to a method for producing a heat-insulating structural and / or light element according to the preamble of patent claim 1.

In the thermal insulation of buildings, the windows of previous constructions form the Archilles tendon, which must be removed. Vacuum technology should make it possible to open windows with a positive energy balance, i.e. with k values below 0.5 W / m2. In winter, the incoming light energy would be greater than the exiting heat loss, which means that a vacuum window on the north side of a house could represent a kind of heating wall during the day, even though it is not illuminated by the sun.

With the simultaneous use of vacuum-insulated light elements as windows and facade elements, conventional building heating could be dispensed with in many cases, since a translucent building skin can transfer enough light energy in the form of heat into the building interior, i.e. represents a kind of heat trap.

The building walls serve as heat stores during the night until the light heating is activated again in the morning.

In summer, the vacuum-insulated windows and facade elements equipped with shading devices create a cooler building, even with excellent sound insulation values, since sound cannot propagate in a vacuum.

However, despite great efforts, it has so far not been possible to find a satisfactory solution.

According to the state of the art, the main obstacle to a market launch is the grid-like supporting elements, such as balls or standing bolts, which interfere with the view of the window and which are rejected by construction practice. There is also a permanent risk of accident due to glass breakage due to implosion of evacuated windows.

In addition, it has so far not been possible to position these known balls or bolts precisely in large numbers in a grid-like manner on a glass surface.

Another obstacle to implementation was the high vacuum used in order to achieve a sufficient insulating effect, which cannot be maintained over long periods due to the constant evaporation of the glass surfaces.

The component according to German Offenlegungsschrift 2 520 062 has the disadvantages of the optically disruptive supporting elements.

The publication of a research work by SERI, Solar Energy Research Institute, Golden, Colorado USA in the journal "In Rewiev" from January 1985 shows that no progress has been made in the recent past.

This publication shows two glass plates with a thickness of 3 mm, between which spherical supports with a diameter of 4 mm which disturbs the view are arranged in a grid. The required high vacuum of 1.3 x 10 ~ 5 mbar poses great difficulties in maintaining it for decades.

There is also a risk of implosion if the glass spacing is provided.

The object of the invention is therefore to provide a method for producing a heat-insulating structural and / or light element according to the preamble of claim 1, which largely prevents heat loss through a permanent vacuum and its high insulating capacity within the scope of industrial possibilities under economic conditions will.

According to the invention, this object is achieved according to the features of the characterizing part of patent claim 1.

This method guarantees the possibility of a high insulating ability of a construction and / or light element in the fine vacuum range and a permanent maintenance of the vacuum in the space formed by the wall elements which are tightly connected in the edge area.

It proves to be particularly advantageous if the support elements are fastened to at least one wall element, as a result of which their production and attachment can be carried out in a simple manner.

The support elements are expediently designed as flat disks, as a result of which a small distance between the wall elements of the intermediate space can be produced from flat sheet or strip material or cylindrical or prismatic materials.

The support elements are advantageously formed from a transparent material in order to promote undisturbed viewing.

This material is preferably made softer than the wall elements, in order to be able to avoid injury or damage to the surface of the wall elements because of the wall elements shifting due to heat differences. Here plastic, for example polyester or teflon, is suitable as a particularly inexpensive material with good sliding properties.

The distance between the supports is primarily determined by your own and the strength properties of the wall elements and must be used accordingly. While distances of approx. 1 cm and less are provided between the support elements in the window glass pane according to European patent specification 0 047 725, in the interest of a low heat transfer the support elements cover a maximum of 1% (one per thousand) of the total area of the evacuated building and / or light element. The tests have shown that a significantly lower value is possible, for example 0.3% (zero-point per mille).

To prevent infrared radiation, it is advantageous if at least one layer of gold, silver or other suitable materials reflecting the infrared rays is provided within the intermediate space.

Due to the changing temperature differences on both sides of the building and / or lighting element and the resulting mutual

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Sliding of the wall elements, it is useful if the support elements with a wall element, e.g. by gluing, are firmly connected.

Of particular importance in the implementation of a constructional and / or lighting element constructed from an economic point of view is the coherent technical functionality of the subtasks of the problem area that is to be solved. The demand for a technically less demanding vacuum in a space with a minimal distance and the resulting mutual displacements of the wall parts in their directions of extension require a combination of solution features that were obviously not recognized even in the known development attempts.

Components without the requirement for light transmission are to be produced in a relatively thin version even with a multi-layer construction.

Getter agents which are connected to the vacuum space can be arranged for a permanent absorption of residual gases or vapors which only occur weakly in the proposed vacuum range. These getter means increase the reliability of the vacuum and can have a decisive influence on the functionality of the component and / or light element. Getter agents that have to be heated periodically are exposed to the sun at the edge of the transparent glass panes.

The tight connection in the end region of the structural and / or light element, which accommodates the mutual displacement of the wall elements, is flexible, elastic and / or flexible, in order to be able to absorb the different changes in the extension of the wall elements, particularly in the case of flat interspaces due to heat differences. The connection to the wall elements can be sealed by means of glass welding, soldering, gluing or vulcanizing a gas-tight, also rubber-like material. The seal can also be designed in several stages and thus offers the advantage of greater security.

A thin metal foil, with which the construction and / or light element is edged in a U-shape at the edge, has proven to be an advantageously tight connection of the wall elements.

Alternatively, the edges of a band-like metal foil on the inside of the wall elements, with the edge of which is tightly connected and with the part protruding beyond the wall elements, can be folded to form a T-shaped cross-sectional profile on the outer edge of the structural and / or light element.

Melting, soldering or gluing can be used as a gas-tight connection with the wall elements. Getter agents can be inserted under the metal foil.

So that the cavity for the getter is given a higher resistance to the atmospheric external pressure, a C-profile open towards the edge of the structural and / or light element can be inserted into the cavity. This allows the cavity to be used for placing getter agents.

The getter means can also be provided outside of the structural and / or light element, in a container communicating with the evacuated space.

As a further possibility for sealing the intermediate space, the wall elements can be formed on the inside with sealing grooves running at least approximately parallel to the edges.

The economical production of the object according to the invention is relatively simple. The transparent or non-transparent vacuum-tight walls, e.g. The desired number of glass plates are placed in a lockable vacuum chamber, spaced one above the other. In the following panels, the support body is placed on the edge, the edge seals and the getter are attached before insertion. After the vacuum chamber has been closed, it is evacuated, and with it the spaces between the panels. By heating the panels at the same time, water and absorbed gases are expelled and sucked out of the panel surfaces and seals, so that they can only outgass very little later.

The heating also serves to melt the solder in the case of soldered edge seals.

If a rubber-like sealing element is used, this can be vulcanized or melted by heating the panel, the temperature being adapted to the respective process. The panels are lowered and pressed with a mechanical holding and lowering device that can be controlled outside the heatable vacuum chamber, so that the support elements and the edge seals come into play. This means that the edges of the board are vulcanized tightly or soldered vacuum-tight together with a flexible metal foil. This is particularly advantageous because the solder or the vulcanizing material is degassed in the vacuum chamber at the same time. After cooling, the elements are completely evacuated and sealed and can be removed from the vacuum chamber ready for use. It would be advantageous if the infrared reflecting layer were evaporated in the same vacuum chamber, so that a special vacuum evaporation system is not necessary. In the manner described using automation, a particularly economical, energy-saving production of vacuum-insulated elements can be achieved because all work processes are combined in one place and run into one another and complement one another.

The invention is illustrated, for example, on the basis of the embodiments shown in the drawing and subsequently discussed. Show it:

1 shows a cross section through the structural and / or light element,

2 shows an enlarged cross section through a construction and / or light element,

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3 shows a cross section through a light element for heating building exterior walls,

4 shows an enlarged cross section through a construction and / or light element,

5 shows an enlarged cross section through a structural and / or light element,

6 is a partially enlarged cross section through a structural and / or light element,

7 shows a cross section through a thin-layer vacuum collector,

8 shows a cross section through a thin-film vacuum collector,

Fig. 9 shows a cross section through a heat accumulator and

Fig. 10 shows a punching device.

1 shows a construction and / or lighting element with the arrangement of the support elements 2 between, for example, two wall elements 1.

FIG. 2 shows a light element with two evacuated spaces formed from three wall elements 1, two of the wall elements 1 standing back with their edges relative to the other wall element 1. Due to the different temperatures on both sides of the light element, a flexible edge seal is provided due to the uneven surface expansion. If the material used for the edge seal has a different expansion coefficient than that of the wall elements, then a shrinkage or compensation at the edge seal directed at right angles to the expansion must be taken into account. A shrunk or corrugated stainless steel foil proves to be very useful for this.

3 illustrates the use of a shading device 26 on the outer wall of a building. A shading device prevents excessive heating of the wall 27. The shading device 26 is driven via a bimetal by an electric motor which is fed by a sun cell 22 and is controlled by a thermostat 24.

Fig. 4 shows a construction and / or lighting element with a central wall element 1 set back inward from the edge of the other wall elements 1. In the resulting cavity, a foil seal 7 soldered to the outer wall elements is provided, as well as an evacuation tube 21, which is connected by means of a valve 16 or can be closed by squeezing.

5 conveys a construction and / or light element with a wall element 1 set back from the edge. The folded metal foil seal 7 is additionally protected by an edge protection profile 10, which can be foamed. By sealing the edge profile, the cavity can serve as a forevacuum chamber. The lid 18 can be evacuated and then closed by means of melting solder 19.

FIG. 6 shows a construction and / or lighting element according to FIG. 12, but with a removable tube 20 through which evacuation can be carried out. The two solder wires 19 running parallel with the folded and shrunk metal foil seal result in

Melt a tight solder joint between glass and metal foil 7.

7 shows a thin-film vacuum collector, but with four wall elements 1 and a soldered metal foil seal 7. The wall element 1 on the light irradiation side is transparent. The inner wall element 1, which presses on the coil, is selectively coated. The transparent wall element 1 on the inside of the radiation as well as the rear wall elements can be coated on the vacuum side with infrared reflecting.

8 illustrates a thin-film vacuum collector, consisting of an absorber 30, which is not arranged in the vacuum space, but is protected on both sides by a vacuum-insulated construction and / or light element. The back element does not have to be transparent.

9 shows a seasonal heat accumulator 32. The selective layer on the container outer wall 33 serves to absorb the light radiation. The entire container is clad on the outside with vacuum-insulated building and / or lighting elements. The snow can slide off in winter due to the sloping side.

In the manufacture of the structural and / or light element according to the invention, the manufacture and insertion of the support elements 2 are of great importance. The present inventive concept proposes that the support elements 2 be above their end position on the one wall element

1 are punched out of a sheet-like material by means of a punching device 38. For example, Experiments have shown that micro-thin transparent discs lying between the wall elements 1 with a size of approximately 1 mm in diameter can hardly be recognized.

A simple, very cost-effective method consists in punching small slices from a film 34 vertically above the end positions on a horizontal glass surface, where the supporting elements

2 must be placed.

For this purpose, a film strip 34 is advantageously advanced and punched in cycles between a mechanically or electromagnetically actuated punch 35 and a die 36, so that the punched piece falls vertically into the correct position or is pressed there by the punch 35. The punching device 38 advantageously has a roll-off and roll-up device 37 for the foil tape 34, similar to the ink ribbon in a typewriter (see FIG. 10).

Since the support elements 2 are placed in a grid-like manner on a glass pane at regular intervals, one or more of the described punching devices 38 are moved into the correct positions above the glass surface, or the pane of glass can also be moved under the fixed or fixed punching devices 38.

A particularly rapid application of the support elements 2 is achieved in that the same number of punching devices 38 are arranged above the wall element 38 with the same grid dimension, as much as support elements 2 are to be applied to the glass.

This could result in large window areas per

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Seconds, several thousand support elements are punched over a glass surface and precisely positioned.

For support elements 2, which are applied to a glass surface in a grid-like manner in any way, there is the possibility that electrostatically chargeable needles or metal pins are provided under the glass pane that correctly position the support elements 2.

Overlying disks have the advantage over balls or bolts that they can neither roll away nor fall over after application.

A further rational application of optically non-interfering support elements 2 is made possible by the vacuum evaporation technology in that the support elements 2 are vapor-deposited by means of masks, as is customary in the production of microchips. The substrate to be evaporated must have a high compressive strength and a low thermal conductivity.

If the support elements 2 have a diameter of less than 0.3 mm, they do not need to be transparent, since they are no longer visible in a window in this size. The shape of the vapor-deposited support elements depends on an economical production method.

It is also possible to apply small, invisible support elements to a glass surface using a printing process. The paste-like or fusible support element material is applied to the glass surface point by point in a predetermined grid arrangement or applied in another suitable way, so that after the paste has hardened, pressure-resistant support elements occur in the form of small elevations on the glass surface.

Support elements 2 could also be scattered on a boundary surface, the scattering being able to take place in different ways. With a thin plate, which has a grid-like perforation and is placed on the boundary surface, the support elements 2 can be positioned.

The support elements 2 can also be applied with a perforated roller, the holes of which correspond to the grid spacing of the support elements on the wall element 1, the support elements 2 falling out or being pressed out of the holes of the roller when the roller rolls on the limited area.

It is advantageous if the support element material for all types of support elements or the support element bearing surface is less hard than glass, so that the boundary surfaces are not damaged by the contact pressure caused by the vacuum.

The vacuum required for the intermediate space is in the non-demanding fine vacuum range. High vacuum is not necessary.

The distance between the support elements depends on the cross section and the compressive strength of the material used. The aim is to optimize the heat conduction as little as possible. Support element material made of getter material would be ideal.

The smaller the cross sections and thus the pressure load capacity, the smaller the distances between the support elements 2 are to be selected, which enables optimization of the thickness of the wall elements or a solution which has a favorable effect on the price of the wall elements. When thin sheet glass is used for a vacuum-insulated building and / or light element, a laminated glass is created that is significantly more resistant to bending under wind pressure than conventional insulating glass with two or three glass panes.

The fact that with a vacuum-insulated light element presses two, three or more glass panels with an atmospheric pressure of 10 tons per m2 onto the support elements 2 arranged in the micro-thin vacuum layer, and these resist a lateral displacement of the glass panels, a certain glass composite is created.

Two, three or more glass sheets almost reach the thickness of a single glass in the total thickness of the sum of the individual glasses.

In the case of vacuum-insulated light elements according to the prior art, with bolt-like or spherical support elements, this composite effect does not occur because they cannot counteract any lateral displacement of the glass panels when they bend.

In addition to the most diverse types of application of highly insulating glazing and combinations, the vacuum-insulated light element is also suitable for cladding and for the active insulation of building facades as a light heating element.

So that the direct solar radiation cannot overheat the building walls 27 behind the light elements, this is combined with a shading device 26, which can be regulated automatically with a thermostat 24. The shading device is advantageously provided in the cavity between the vacuum-insulated light element and a transparent or partially transparent facade panel 40 arranged parallel thereto, which can also be structured like a plaster.

A selective layer 25 can be used to absorb the light energy.

The vacuum-insulated light element with a micro-thin intermediate space 3 also permits highly efficient active use of solar energy by the solar collector 29, in that a selective layer 25 facing the sun is arranged on an absorber 30 between two glass panes.

The heat generated by solar radiation or light radiation in the absorber 30 can be supplied to a storage unit 32 or heat consumer.

There is a micro-thin vacuum layer 3 between the absorber 30 and the front and rear glass cover, with the advantage that, in the event of an implosion, no dangerous glass fragments can be thrown away and no high vacuum, but only a fine vacuum is required. Such a thin-film vacuum collector 29 can also be used as a facade element with or without a shading device 26.

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The atmospheric external pressure of 10 tons per m2, which presses on the glass cover and, via the support elements 2, on the absorber 30, can be used to compress a pipe coil located between two absorber plates.

The high pressing pressure results in a good heat-conducting connection between absorber plates 30 and pipe coil, so that a welded or soldered connection can be saved.

A vacuum-insulated light element with a k-value of approx. 0.3 W / m2 enables the construction of a lossless seasonal heat accumulator 32 for the first time. For this purpose, a container 33 installed outdoors is provided with vacuum-insulated light elements on the outside. Since the light and solar radiation incident on the container walls 27 is stronger than the exiting heat loss, the storage medium in the storage 32 cannot cool, i.e. there are no standstill losses. This makes it possible to economically store heat at a high temperature level from summer to winter. Simple steel, plastic or concrete containers serve as containers 33 for water. The outer walls of the container are advantageously provided with a selective layer 25 to absorb the light energy. Such a store can also be set up directly under the roof of a house if the roofing material in the area of the store is transparent or consists of vacuum-insulated light elements.

Vacuum-insulated components and / or light elements according to the idea of the invention are also suitable as inexpensive thin-layer insulation for refrigerators, freezers, cold rooms, etc., and wherever high thermal insulation is to be achieved with the smallest space requirement.

Instead of glass panels, metal plates can be used in any number of layers, so that with a thickness of approx. 10 mm, k values of less than 0.1 W / m2 can be achieved. An even better k value is achieved by arranging infrared-reflecting foils in the micro-thin vacuum layers 3.

It is advantageous to solder the edge seals to the glass surfaces in a vacuum oven built for this purpose. For this, the glass edges and edge seals are pre-tinned. After the support elements 2 have been applied and the edge seal has been placed on the first glass pane, the second glass pane is placed thereon. Both disks are spaced apart from one another by a holding device or by a solder. After closing the vacuum oven, the evacuation and heating of the oven can begin.

At the same time, the air and moisture between the glass panes is also sucked out. After a certain time, the temperature in the vacuum furnace is increased so that the edge seal 7 melts with the solders 19. As a result, the weight of the upper disc drops onto the edge seal 7 with the liquid solder 19 and a gas-tight connection is created. After the heating process has been terminated, the solder 19 cools so that the completely evacuated light element can be removed from the furnace. If the dead weight of the upper pane is not sufficient as a load, additional pressure can be used to help. Instead of a support solder 19, which causes the upper pane to sink onto the edge seal and the support elements 2 during melting, a mechanical lowering device can also be used.

The evacuation of a light element can, however, also take place by means of a tube 21 which is guided through the edge seal and which is then squeezed off and soldered tightly.

An opening 15 leading through the glass pane or the edge seal can also be evacuated. For this purpose, a tube 20 is pressed tightly onto the glass pane or the edge seal and the air is sucked out through this tube 20. A closure cover 18 is located within the tube 20 above the opening 15. During the evacuation, this is raised somewhat, that is to say not applied tightly. After the evacuation has ended, the cover 18 is lowered and closed gas-tight. This is done by means of a solder 19 which melts between the glass pane or edge seal and the cover and which is heated by a heat source. In this way, evacuation can be carried out directly in the vacuum furnace, even if the edge seals are already sealed.

After the required vacuum has been reached, the solder 19 lying between the sealing cover 18 and the edge seal 7 or the glass surface is melted by means of a heat source, so that a gas-tight solder connection 8 is produced.

Claims (28)

Claims 1. A method for producing a heat-insulating structural and / or light element, consisting of at least two, at least approximately parallel wall elements, which are held at a mutual distance by support elements arranged therebetween and to form an evacuated intermediate space which reduces heat conduction in its edge region by means of a one mutual displacement of the wall element-receiving connection are tightly connected to one another, characterized in that the wall elements (1) each in pairs or several times after inserting the support elements (2) and any getter means and applying or applying the edge seal to form the intermediate space (3) in evacuated, heated and sealed in one process. 2. The method according to claim 1, characterized in that the support elements (2) are punched out and placed over their end position on the one wall element (1) by means of a punching device (38) from a supplied sheet-like or sheet-like material. 3. Device for carrying out the method according to claim 2, characterized in that a punching device (38) designed with a plurality of stations which are matched to the grid dimension of the supporting elements (2) and a feed device for the material to be punched are provided. 4. Apparatus according to claim 2 or 3, characterized 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 6 11 CH 687 628 A5 12th characterized in that beneath the wall element (1) receiving the support elements (2) and the punching device (38) are provided electrostatically chargeable needles or pins for positioning the support elements (2). 5. A method for producing a heat-insulating construction and / or light element according to claim 1, characterized in that the support elements (2) by vapor deposition on the intended wall element (1) and after a with the end positions of the support elements (2) screened, openwork mask be evaporated. 6. A method for producing a heat-insulating construction and / or light element according to claim 1, characterized in that the support elements (2) are applied as a hardening paste or melting material. 7. The method for producing a heat-insulating structural and / or light element according to claim 1, characterized in that the support elements (2) are arranged by scattering on the wall element (1). 8. A method for producing a heat-insulating structural and / or light element according to claim 1, characterized in that the supporting elements (2) are applied to a wall element (1) from a rolling roller provided with openings on the circumference of the jacket according to the predetermined grid dimension. 9. A method for producing a heat-insulating structural and / or light element according to one of claims 1 to 8, characterized in that the evacuation of the intermediate space (3) through an opening in the edge seal, the wall elements (1) or the getter agent container and this opening soldered under vacuum and the solder joint is only connected to the atmospheric environment after the solder has hardened. 10. Construction and / or lighting element, consisting of at least two, at least approximately parallel wall elements, which are held at a mutual distance by support elements arranged therebetween and are formed to form an evacuated intermediate space reducing the heat conduction in their edge region by a tight connection, thereby characterized in that the distance between the wall elements (1) of the intermediate space (3) is a maximum of 0.5 mm. 11. Construction and / or lighting element according to claim 10, characterized in that the support elements (2) are attached to at least one wall element (1). 12. Construction and / or light element according to claim 11, characterized in that the height of the support elements (2) is less than thick. 13. Construction and / or light element according to claim 12, characterized in that the support elements (2) are designed as flat disks. 14. Construction and / or light element according to one of claims 10 to 13, characterized in that the support elements (2) are formed from a transparent material. 15. Construction and / or lighting element according to one of the Claims 10 to 14, characterized in that the support elements (2) are softer than the wall elements (1). 16. Construction and / or light element according to one of claims 10 to 15, characterized in that the support elements (2) between the wall elements (1) a maximum of 1% (one per thousand) of the total area of the construction and / or light element. ken. 17. Construction and / or light element according to one of claims 10 to 16, characterized in that it is provided within the evacuated intermediate space (3) with at least one layer reflecting the infrared radiation. 18. Construction and / or light element according to one of claims 10 to 17, characterized in that getter means (5) connected to the vacuum are provided. 19. Construction and / or light element according to claim 10, characterized in that the edge seal is formed in several stages and has mutually sealed, evacuated channels. 20. Construction and / or light element according to claim 19, characterized in that the edge seal comprises the wall elements (1) in a U-shape. 21. Construction and / or light element according to claim 10, characterized in that the edge seal is connected laterally to the inner sides of the wall elements (1) and with an intermediate part projecting beyond the edge of the wall elements (1), a folded, at the Edge of the structural and / or light element forms a T-shaped cross-sectional profile. 22. Construction and / or lighting element according to claim 10, characterized in that the wall elements (1) are formed on the inside with at least approximately parallel to the edges sealing grooves (6). 23. Construction and / or lighting element according to claim 10, characterized in that at least one of the wall elements (1) is formed with a recessed edge relative to the / the other wall elements (1). 24. The construction and / or light element according to claim 10, characterized in that the edge seal is formed by a film (7) which can be shrunk or corrugated transversely to the extension of the wall elements (1), the edges of which are connected to the wall elements (1). 25. Construction and / or lighting element, consisting of at least two, at least approximately parallel wall elements, which are held at a mutual distance by support elements arranged therebetween and are formed by a tight connection in their edge region to form an evacuated intermediate space which reduces heat conduction characterized in that a thermostatically controlled shading device (26) operated from daylight and provided with energy is provided on the outside or the shading can be controlled by other means. 26. Building and / or lighting element, consisting of at least two, at least approximately parallel wall elements, which pass through between them 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 7 13 CH 687 628 A5 arranged support elements are held at a mutual distance and are formed by a tight connection to form an evacuated intermediate space which reduces the heat conduction, characterized in that it is provided as a collector for the production of light and solar energy, the wall element arranged on the outside (1) is transparent and is provided in the intermediate space (3) with selectively coated absorbers and liquid-carrying lines. 27. Construction and / or lighting element, consisting of at least two, at least approximately parallel wall elements, which are held at a mutual distance by support elements arranged therebetween and are formed to form an evacuated intermediate space which reduces the heat conduction in their edge region by a tight connection, thereby characterized in that it is arranged on the outside of a heat accumulator (32) which is irradiated with daylight and the storage walls are provided with black or selective coating. 28. Construction and / or lighting element according to one of claims 10 to 27, characterized in that the wall elements (1) are formed from glass. 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 8th