Sky component for unglazed horizontal rectangular opening Dsh -- Algorithm 2.33

This algorithm gives the sky component (from a CIE overcast sky) on a horizontal plane directly beneath one corner of the opening.

Input

Angles a, b, c and d from figure, radians

Equation

Note

To obtain the sky component for a opening with clear 6mm glass, the value Ds obtained from this algorithm may be multiplied by the transmittance T obtained from algorithm 2.34.

Source

Seshadri(1)

References

1. Seshadri T N Equations of sky component with a CIE standard overcast sky Proc. India Academy of Sciences Paper 57A 233-242 (1960)

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