NCEUB Conferences, 13th International Radiance Workshop 2014

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Design of Prismatic light redirecting fenestration using Radiance
Khaled Nassar

Building: Arup 8 Fitzroy St.
Room: Emmerson & Shears Room
Date: 2014-09-02 04:00 PM – 04:30 PM
Last modified: 2014-08-30


Complex Fenestration Systems (CFS) are window systems used to redirect daylight into a room with the objective of increasing the daylightling performance for the space. Prismatic light redirecting glass or plastic is a type of CFS which has been proposed to help redirecting daylight into a room in order to optimize its luminous properties. Daylighting designers and researchers usually use physical and virtual models to analyse daylighting performance of these prismatic surfaces. This presentation provides a detailed step-by-step procedure for the design of prismatic surfaces for light redirection specifically for the MENA (Middle East and North Africa) region using RADIANCE. The workflow using the BSDF functionality of RADIANCE, as well at the details of the geometric modeling are introduced. Results from RADIANCE are compared to other ray tracing software. Also specific measures used as criteria for the design of prismatic and other light redirecting surfaces are proposed. These measures focus on the duration and the power of the redirected light. A detailed case study is described and the results are analyzed and presented.