Last update:00-04-24
Examples
Sometimes a designer may want a device that will block direct solar radiation from entering a window during certain times of the day or the year. That may be desirable for two reasons: to reduce the cooling loads and/or to avoid uncomfortable lighting in perimeter offices due to excessive contrast. With fixed devices, it is generally not possible to satisfy all the requirements. Relatively good results are possible for south-facing windows, and the analysis is particularly easy. Consider a south-facing window with a horizontal overhang of with z, as in Fig. 2.3
For this case one can show
that the depth y of the shadow attains its extreme value for the day at solar noon.
Fig. 2.3 Shading of
south-facing window by horizontal overhang
The window shadings overhang movement