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Proceedings Paper

Embedded microstructures for daylighting and seasonal thermal control
Author(s): André Kostro; Mario Geiger; Nicolas Jolissaint; Marina A. Gonzalez Lazo; Jean-Louis Scartezzini; Yves Leterrier; Andreas M. Schüler
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Paper Abstract

A novel concept for an advanced fenestration system was studied and samples were produced to demonstrate the feasibility. The resulting novel glazing will combine the functions of daylighting, glare protection, and seasonal thermal control. Coated microstructures provide redirection of the incident solar radiation, thus simultaneously reducing glare and projecting daylight deep into the room in the same manner as an anidolic mirror-based system. The solar gains are reduced for chosen angles corresponding to aestival elevations of the sun, thereby minimizing heating loads in winter and cooling loads in summer. A ray-tracing program developed especially for the study of laminar structures was used for the optimization of structures with the above mentioned goals. The chosen solution is based on reflective surfaces embedded in a polymer film that can be combined with a standard doubled glazed window. The fabrication of such structures required several steps. The fabrication of a metallic mould with a relative high aspect ratio and mirror polished surfaces is followed by the production of an intermediate Polydimethylsiloxane moulds that was subsequently used to replicate the structure with a UV curable polymer. Selected facets of these samples were then coated with a thin film of highly reflective material in a physical vapour deposition process. Finally, the structures were filled with the same polymer to integrated the mirrors.

Paper Details

Date Published: 11 October 2012
PDF: 12 pages
Proc. SPIE 8485, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX, 84850L (11 October 2012); doi: 10.1117/12.930476
Show Author Affiliations
André Kostro, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Mario Geiger, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Nicolas Jolissaint, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Marina A. Gonzalez Lazo, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Jean-Louis Scartezzini, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Yves Leterrier, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Andreas M. Schüler, Ecole Polytechnique Fédérale de Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 8485:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration IX
Roland Winston; Jeffrey M. Gordon, Editor(s)

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