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Simulation-based design of an angle-selective and switchable textile shading system

 
: Bueno, B.; Wilson, H.R.; Sunkara, S.; Sepúlveda, A.; Kuhn, T.E.

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Building and environment 184 (2020), Art. 107227
ISSN: 0360-1323
Bundesministerium fur Wirtschaft und Energie BMWi (Deutschland)
03ET1432A
English
Journal Article
Fraunhofer ISE ()

Abstract
Recent improvements in the manufacture of textiles allow enhanced functionality in architectural applications. In this study, a switchable and angle-selective shading system is developed on the basis of a new textile structure. The geometry of the textile structure is optimized through a simulation-based approach. Textiles are characterized by Bi-directional Scattering Distribution Functions (BSDF), which are calculated by ray-tracing techniques and verified with measurement data from a three-dimensional scanning goniophotometer. The design workflow is constrained by a set of requirements on the optical properties of the shading device. The resulting shading system is evaluated in terms of daylighting provision and glare protection by applying state-of-the-art simulation techniques. For doing that, the optical behaviour of the switchable shading system is discretized in six states. These states are then compared with a conventional, white, glare-protection roller blind. The results of the evaluation indicate that at least one state of the new shading system provides a better daylighting performance than the conventional roller blind, and that at least two states provide better glare protection.

: http://publica.fraunhofer.de/documents/N-615187.html