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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
$u_b$
Formulae
$\frac{L_b}{r_b}$from $L_b$ and $r_b$
$\frac{e^{G_b}+1}{2e^{G_b}}$from $G_b$
Related
$G_b$
Geometric factor for backfill
$L_b$
Vertical center of backfill [mm]
$r_b$
Equivalent radius of backfill [mm]
Used in
$G_b$
Geometric factor for backfill