F3D_55

Parallel regular octagons

Function f3d_55(l,h) returns the view factor between parallel regular octagons.

Inputs:
l = edge of octagon [m] or [ft]
h = distance between the octagons [m] or [ft]

Example:
$UnitSystem SI Pa J K m radian
h=0.25 [m]
l=0.5 [m]
F=f3d_55(l,h)

{Solution:
F=0.6634}

Reference:
Feingold, A., 1966, "Radiant-interchange configuration factors between various selected plane surfaces," Proc. Roy. Soc. London, ser. A, vol. 292, no. 1428, pp. 51-60.