Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Transparent insulation systems composed of different materials

: Pflüger, A.; Platzer, W.; Wittwer, V.

Bloss, W.H.; Pfisterer, F.:
Advances in solar energy technology. Vol.1
Oxford: Pergamon Press, 1988
ISBN: 0-08-034315-5
International Solar Energy Society (Congress) <10, 1987, Hamburg>
Fraunhofer ISE ()
foam; heat loss coefficient; honeycomb structure; theoretical model; transmittance; transparent insulation system

The solar thermal characteristics of transparent insulation materials are given. Computational methods to calculate the energy transport in transparent insulation systems are described. Any combination of different materials, plastic films and air gaps is possible. The two modes of energy transport, the heat transport and the solar transmission, couple inside the materials: the irradiation is partly absorbed by the transparent insulation and flows partly to the absorber and partly to the outer cover by thermal conduction, convection and radiation. For this reason the total energy transmission is higher than the transmission for solar radiation. This quantity can be calculated. Practical results are calculated for a flat plate collector with a selective absorber, an air gap and a honeycomb structure with high aspect ratio. (ISE)