Community Research and Development Information Service - CORDIS

Abstract

The aim of this project was to develop a highly efficient temporally variable heat and sunlight protective device for windows, allowing optimal passive use of solar energy. The operating principle is based on influencing the energy flow through the window in both directions (distinguishing between summer day, winter day and winter night) by using different selectively coated films. The investigations showed that films suitable for summer days (sunshield film) and winter nights (heat insulating film) are already available commercially; usuable coatings for the film for winter coatings only as small samples. The K value of a double glazed window was found to improve from 2,7 W/m**2K to 1,1 W/m**2.K when fitted with heat insulating film. This improvement was obtained by reducing the radiation exchange between the glass panels and by dividing their volume into two separate compartments. An automatic solar electric drive was developed to run the multifilm blind. Future work will be concerned with improving the optical quality and thermal properties of the films, and optimizing the drive system.

Additional information

Authors: DEUBLE W, FRAUNHOFER-INSTITUT FUER SOLARE ENERGIESYSTEME, FREIBURG (GERMANY);SCHMID J FRAUNHOFER-INSTITUT FUER SOLARE ENERGIESYSTEME, FREIBURG (GERMANY), FRAUNHOFER-INSTITUT FUER SOLARE ENERGIESYSTEME, FREIBURG (GERMANY)
Bibliographic Reference: EUR 9845 EN (1985) MF, 26 P., BFR 150, BLOW-UP COPY BFR 150, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123101000 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en