#Daylight + lighting
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daylight design factor<br />
15(23)<br />
With a service daylight factor<br />
from the previous chart...<br />
The value is modified to be<br />
used as a daylight design factor,<br />
for determining required window<br />
area for room spaces.<br />
eg: From the previous example<br />
the Daylight Service Factor of<br />
1.7 is divided by the dirt<br />
accumulation and glass<br />
transmission tables.<br />
Clear glass has a transmittance<br />
value of 85%, (a correction<br />
factor of 1) and a suburban area<br />
clean window (0.9) the value<br />
becomes…<br />
1.7 / 1.0 / .9 = 1.88 (DDF)
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