Ground shadow area of a rectangular building--Algorithm 1.17

The area, ag, of the shadow cast on level ground by a building that is rectilinear in plan and section.

Input
Plan dimensions of the building, L & W metres
Height of the building above ground level, H metres
Orientation of the building (azimuth of normal to facade of length L),
Solar altitude and azimuth, gs & as (algorithm 1.14)

Equation

Source
Tregenza (1)

References
  1. Tregenza P R The proportions of a rectangular building for minimum ground shading Building and Environment 12 221-222 (1977)
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