I am trying to calculate DGPs for a whole year in hourly values. To calculate vertical illuminate on the eye level (Ev), I considered a small grid in eye level facing to the window and extracted the hourly values of vertical illuminance.
However, when I manually calculate DGPs based on the following equation, I observed DGPs exceeding one.
DGPs = 6.22 × 10−5 * Ev+ 0.184
I have two que…
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