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Thermal resistance 11 of multi-layer backfill

Thermal resistance of 1st segment along flow path $\Phi_1$ of the multi-layer backfill method.

Symbol
$R_{q11}$
Unit
K.m/W
Formulae
$\frac{\rho_b \ln\left(\frac{s_{b3}+C_{b1} \left(d_{b3}-s_{b3}\right)}{r_o}\right)}{\\arctan\left(\frac{w_{b4}}{s_{b3}}\right)}$
Related
$C_{bq}$
Constants $C_1$ - $C_7$ of multi-layer backfill
$d_{b3}$
Distance c of multi-layer backfill [m]
$r_o$
Radius of object [m]
$\rho_b$
Thermal resistivity backfill [K.m/W]
$s_{b3}$
Thickness from object to top of bedding layer [m]
$w_{b4}$
Distance to lateral edge of multi-layer backfill [m]
Used in
$R_{CG}$
Thermal resistance of multi-layer backfill [K.m/W]