Spherical point source (1) to plane rectangle
FDiff_5(a, b, c) provides the view factor from a spherical point source to a plane rectangle (2).
Inputs:
a is the height of the rectangle above the spherical point [m or ft]
b is the width of the rectangle [m or ft]
c is the distance from the rectangle to the spherical point in the plane of the sphere [m or ft]
Example:
$UnitSystem SI K Pa J deg
a=1 [m]
b=2 [m]
c=0.5 [m]
F=FDiff_5(a, b, c)
{Solution: F=0.0836}
Reference: Howell, www.me.utexas.edu/~howell/sectionb/B-106.html