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Substitution coefficient u

Substitution coefficient for the calculation of the thermal resistance of the equivalent radius of backfill to ambient.

Symbol
$u_{b}$
Formulas
$\frac{L_{b}}{r_{b}}$from $L_b$ and $r_b$
$\frac{e^{G_{b}}+1}{2e^{G_{b}}}$from $G_b$
Related
$G_{b}$
Geometric factor backfill
$L_{b}$
Vertical center backfill [mm]
$r_{b}$
Equivalent radius backfill [mm]
Used in
$G_{b}$
Geometric factor backfill