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Proceedings Paper

Glazings with granular aerogel
Author(s): Joerg J. Dengler; Volker Wittwer
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Paper Abstract

Double glazing units filled with granular aerogel open up new applications in the fields of daylighting systems and passive solar architecture. Silica aerogel has ideal characteristics for solar thermal applications. High transparency for solar radiation is combined with extremely low thermal conductivity. The chemical company BASF (D) is developing a granular form of aerogel, which will be introduced to the market in the near future. The application potential of this material in window systems was tested as part of a CEC-JOULE project in co-operation with four other industrial companies and two research institutes under the leadership of the Fraunhofer-Institut fur Solare Energiesysteme (FhG-ISE) in Freiburg. A typical u-value for a double glazed window with a 16 mm thick layer of granular aerogel is 1.0 W m-2 K-1, the solar transmission for diffuse light is about 45%. Both parameters are variable over a wide range depending on the particle size distribution, thickness of the layer and choice of the filling gas. First window elements were tested in different applications. Realized installations are presented.

Paper Details

Date Published: 9 September 1994
PDF: 10 pages
Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185412
Show Author Affiliations
Joerg J. Dengler, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Volker Wittwer, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)

Published in SPIE Proceedings Vol. 2255:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII
Volker Wittwer; Claes G. Granqvist; Carl M. Lampert, Editor(s)

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