Substitution coefficient u

Substitution coefficient for the calculation of the thermal resistance to ambient.

Symbol
$u$
Formulae
$\frac{2L_{cm}}{D_o}$Standard case
$\frac{2\left(L_{cm}-d_{psc}\right)}{D_o}$Point source correction
$\frac{2\left(L_{cm}+d_{im}\right)}{D_o}$Non-isothermal earth surface
$\frac{2\left(L_{cm}-d_{psc}+d_{im}\right)}{D_o}$Point source correction & Non-isothermal earth surface
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