DE2700767A1 - Photovoltage and thermal solar heat collector - has body covered with photovoltaic layer on side towards sun - Google Patents

Abstract

The solar heat collector has a hollow body contg. the heat transfer medium. On the side nearest the sun, this body is covered with a photovoltaic layer less than 50 microns thick. This layer can be deposited on a supporting sheet of plastic, Al or Al-based alloy by thermal vapourisation or cathode pulverisation, the sheet being then welded or glued to the sunward side of the body. The sheet carrying the photovoltaic layer can itself form part of the body enclosing the heat transfer medium. Below this body there can be a further plastic sheet shutting it off from the outside atmosphere, and coated on the inside with a layer of infra-red reflecting material less than 100 microns thick.

Description

PATF.NTDESCHREI Bt: NG

"Combined photovoltaic and thermal solar collector I0 Thermal solar collectors through which the heat transport medium - in general Water that is pumped through it belongs in the form of metallic flat-plate collectors the state of the art. Plastic collectors are also occasionally used for water heating related.

Photovoltaic layers, on the other hand, for generating electrical energy Energy from radiation has been common for spacecraft for years, mostly Silicon single crystals are used. For terrestrial generation of electrical For price reasons, they have not yet been used to any significant extent from solar energy found.

The use of thermal collectors in remote places where If there is no supply of electrical energy from the grid, this becomes more complex and loses availability and efficiency that the energy used to pump the Heat transport medium, especially in the start-up phase, from batteries must be removed.

A combination of the two methods results in a more surprising ~ wise a more cost-effective energy conversion than can be achieved with the individual processes can be. The inventive solution consists in the photovoltaic layer in a thickness of less than So u on a supporting foil made of metal or plastic to be applied and with good thermal contact on the top of a thermal solar collector to apply firmly. In the case of plastic collectors, the photovoltaic Layer covered plastic film itself can be the upper part of the solar collector.

The photovoltaic layer can be vacuum evaporation or cathodic Atomization can be produced. Should it look on the usual Rollbond collectors Aluminum or Al-based alloys are applied to adjust the thermal expansion an aluminum carrier film is expedient. To be combined with plastic collectors With regard to the connection technology, plastic carrier foils are usually preferable be.

In the case of plastic collectors, the efficiency can be increased by that one made with the same techniques, adhering to a plastic film applied, translucent, infrared reflecting layer at a distance from 5 to 5 mm above the part of the collector that surrounds the wire transport medium is respected in such a way that there is an enclosed space between it and the actual collector Air volume is created. In contrast to today's application, infrared look more reflective Ahdeck glass panes, the layer here is firmly connected to the actual collector and slotted from the elements (Fig. 1).

The configuration of the two types of collectors is technically special simple and therefore inexpensive if collectors have a large area, i.e. practical long lengths are used, since then the generation of optimal DC voltages with the photovoltaic layer by connecting individual areas in series can be solved very easily with little effort.

As in the case of plastic collectors, the applied photovoltaic layers The collector plastic can be exposed to medium-level ultraviolet radiation these can also be used without a UV-absorbing glass cover. in such skins becomes a particularly simple form of a combined photovoltaic and thermal Collector achieved in that underneath which enclosing the heat transport medium Plastic shell separated an air volume by another plastic film that acts as a heat insulator downwards. The thickness of the insulating layer of air can be varied by inflating the lower volume of air (Fig.

The thermal insulation can be improved by being on the inside An infrared reflective layer is applied to this additional film. To the overlying this film, the heat transport medium moving part of the To carry the plastic collector and yet still have the insulating air gap To obtain the full width, the bottom film can be used in the packaging industry jiblichen role models and with completed, protruding from the film level air volumes are provided.

L e r s e i t e

Claims (7)

PATENT APPROACH 1. Solar collector, characterized in that the heat transfer medium containing the heat transfer medium on its facing the sun Side covered with a photovoltaic layer less than 5 microns thick is. 2. Solar collector according to claim 1, characterized in that the photovoltaic layer by thermal evaporation and cathode arcing deposited on a carrier film made of plastic, aluminum or an Al-based alloy and was glued or welded onto the sunny side of the collector body. 3. Solar collector according to claim 1 and 2, characterized in that that the plastic film carrying the photovoltaic layer itself is the host transport medium is partly an inclusive part of the collector body. 4. Solar plastic collector according to claim 1 - 3, characterized in that that underneath the plastic case surrounding the heat transport medium there is another plastic film that seals it off from the outside atmosphere, those on their inside with an infrared reflective layer of a thickness is covered by - loo u. 5. Solar plastic collector according to claim 1 - 4, characterized in that that the bottom film is deeply embossed and / or provided with load-bearing air chambers is. 6. Solar collector made of plastic according to claim 1 - 5, characterized characterized in that the plastic body leading the heat transport medium after at the top by an air gap separated from it, but with at the edges firmly attached to it plastic film, which is covered on the inside with a translucent, iR reflective layer a thickness of C So u can be covered by the surrounding Atmosphere is separated. 7. Solar collector according to claim 1-6, characterized in that it has a length of # 5 m.