ZEMCH 2015 - International Conference Proceedings | Page 720

Daylight Analysis
Daylight levels in the selected classroom have been evaluated before and after the renovation.
Daylight Factor DF [%] calculated as a percentage ratio between indoor illuminance on a working
plane and external horizontal illuminance (BS 8206-2, 2008; CSN 730580-1 2007 and Z1 2011), which
was simulated in the daylight software WDLS (WDSL 2015).
The computer simulations were run for conditions of the CIE overcast sky model (BS 8206-2 2008)
and dark ground without shading external obstructions. The room surfaces reflectance are: walls
r=0.5, floor r=0.3, ceiling soffit r=0.7. Daylight factor distribution on the working plane, 0.85 m over
the floor level, is presented in Figure 4. Maximal DFmax, minimal DFmin and mean DFm values of
the daylight factors and daylight uniformity u=DFmin/DFmax were compared.

Figure 4: Daylight factor DF (%) on the working plane in the classroom

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ZEMCH 2015 | International Conference | Bari - Lecce, Italy