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)
$K_{E}$