Assessment of Daylighting Design Tools Against Test Cases Included in CIE's 171:2006 Report

Abstract:

Daylighting design of buildings is a neglected discipline of building physics, although it is an important element of a healthy indoor environment, since daylight influences the well being of every living being inhabiting a space inside and outside of buildings. It influences the biological rhythms of humans and also enables a visual feedback from the surroundings. To evaluate daylighting inside of buildings one may use any of the available numero-graphical or numerical approaches as much as computer tools. Nevertheless one does not know how precise these methodologies really are. The values of sky, externally and internally reflected components of the obtained daylight factor may vary depending on the given tool, used. To prevent such errors CIE did publish a technical report for the validation of computer design tools, howbeit it can be used to verify the quality of older methods too. The aim of the paper is to point out, that numero-graphical approaches can sometimes determine the daylight factor levels with a smaller errata in contrast to newly developed software, particularly if it handles about the sky and externally reflected components of daylight factor.

• Periodical: Advanced Materials Research (Volume 899)
• Pages: 352-355
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.899.352
• Online since: February 2014
• Authors: František Vajkay*, Lukas Zizka
• Keywords: CIE Sky Types, CIE Test Cases, Computer Simulations, Daniljuks Approach, Daylight Factor (DF), Daylighting, Radiance, Ray-Tracing, Working Plane

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