# Thermal resistance 12 of multi-layer backfill method

Thermal resistance offered by the material in layer 2 along the flow path q1.

Symbol
$R_{q12}$
Unit
K.m/W
Formulae
 $\frac{s_{2}}{k_{2} s_{T}}$ Paper R. de Lieto Vollaro et al. (2011) $\frac{\frac{s_{2}}{k_{2}} + \frac{s_{1}}{k_{1}} + \frac{1}{K_{E}}}{s_{T}}$ Paper R. de Lieto Vollaro et al. (2014)
Related
$k_{1}$
$k_{2}$
$K_{E}$
$s_{1}$
$s_{2}$
Used in
$R_{q1}$