Simple tool to evaluate the impact of daylight on building energy consumption
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Posting Date | 12 June 2009Publication Date | 2008
Country | Denmark
Geographic Coverage | International
Theme | Calculation, simulation
Target Group | Building professionals
Type of publication | Article
Number pages | 8
Source Languages | English
Simple tool to evaluate the impact of daylight on building energy consumption
This paper presents a simple building simulation tool for integrated daylight and thermal analysis. The tool is
capable of importing the thermal and visual properties for different glazings and shading positions from the
Window Information System (WIS) program. Radiosity methodology is used to derive the daylight levels for
different sky conditions on an hourly basis. The daylight levels are fed into an existing simple thermal simulation program capable of calculating energy demand and the indoor environment. Straightforward control systems for general and task lighting systems have been implemented together with a shading control strategy that adjusts the shading according to the indoor operative temperature and the profile angle of the sun. The implemented daylight calculation method allows for shades from the window recess and overhang. Comparisons with the raytracing program Radiance show that the accuracy of this approach is adequate for predicting the energy implications of photoresponsive lighting control.
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