SF_21
Function SF_21 provides the shape factor ([m] or [ft]) for conduction between one pipe in a circular array of equally spaced pipes and the exterior of a cylinder.
Inputs:
d = diameter of circular pipe array ([m] or [ft])
D_out = diameter of the bounding cylinder ([m] or [ft])
d_p = diameter of pipes ([m] or [ft])
N = number of pipes
L = length of pipes and cylinder ([m] or [ft])
Example: SF = SF_21(d, D_out, d_p, N, L)
Reference: White, F. (1984). Heat transfer. Reading, Massachusettes: Addison-Wesley. p. 118.