Offset Parallel Rectangles
Function F3D_14(x1,x2,y1,y2,a1,a2,b1,b2,z) returns the view factor from area 1 to area 2 of two arbitrarily-located finite rectangles that are oriented perpendicular to each other.
Inputs:
x1, x2, y1, y2, a1, a2, b1, b2, and z are the lengths shown in the figure in [m or ft]
Note: The input values must all be greater than 0!
Example:
$UnitSystem SI K Pa J rad
x1=0.1 [m]
x2=0.2 [m]
y1=0.1 [m]
y2=0.2 [m]
a1=0.1 [m]
a2=0.2 [m]
b1=0.1 [m]
b2=0.2 [m]
z=0.05 [m]
F=F3D_14(x1,x2,y1,y2,a1,a2,b1,b2,z)
{Solution: F=0.4153}
Reference: Howell, http://www.me.utexas.edu/~howell/sectionc/C-13.html