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Title: Three approaches to optimize optical properties and size of a South-facing window for spatial Daylight Autonomy
Authors: Kazanasmaz, Zehra Tuğçe
Grobe, Lars Oliver
Bauer, Carsten
Krehel, Marek
Wittkopf, Stephen
Keywords: BSDF
Window design
Spatial Daylight Autonomy
Issue Date: 1-Jun-2016
Publisher: Elsevier Ltd.
Source: Kazanasmaz, T., Grobe, L.O., Bauer, C., Krehel, M., and Wittkopf, S. (2016).Three approaches to optimize optical properties and size of a South-facing window for spatial Daylight Autonomy. Building and Environment, 102, 243-256. doi:10.1016/j.buildenv.2016.03.018
Abstract: This study presents optimization approaches by a recent Climate-Based-Daylight-Modeling tool, EvalDRC, to figure out the necessary area for a daylight redirecting micro-prism film (MPF) while minimizing the glazing area. The performance of a window in terms of spatial Daylight Autonomy (sDA) is optimized by its geometry and optical properties. Data implemented in simulation model are gathered through on-site measurements and Bidirectional-Scattering Distribution Function (BSDF) gonio-measurements. EvalDRC based on Radiance with a data driven model of the films' BSDF evaluates the window configurations in the whole year. The case to achieve an sDA of at least 75% is a South-facing window of a classroom in Switzerland. A window zone from 0.90 m to 1.80 m height provides view to the outside. The upper zone from 1.80 m to 3.60 m is divided into six areas of 0.30 m height in three optimization approaches including the operation of sunshades as well. First, the size of the clear glazing is incrementally reduced to find the smallest acceptable window-to-wall ratio (WWR). Second, micro-prism films are applied to an incrementally varying fraction the initial glazed area to determine the minimum film-to-window ratio (FWR). Finally, both approaches are combined for a minimum FWR and WWR. With clear glazing and WWR of 75%, the sDA of 70.2% fails to meet the requirements. An sDA of 86.4% and 80.8% can be achieved with WWR 75%, FWR 1/9 and WWR 50%, FWR 1/2 respectively. The results demonstrate the films' potential to improve the performance of windows with reduced WWR.
ISSN: 0360-1323
Appears in Collections:Architecture / Mimarlık
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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