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Thickness of soil layer

Thickness of soil layer providing a thermal resistance equivalent to $h_{amb}$.

Symbol
$e_{soil}$
Unit
m
Formulae
$\frac{D_{soil}}{2} \left(e^{\frac{2k_4}{D_{soil} h_{amb}}}-1\right)$
Related
$D_{soil}$
Outer diameter of soil layer [m]
$h_{amb}$
Pseudo film coefficient of ambient fluid at ground level [W/(K.m$^2$)]
$k_4$
Thermal conductivity of soil [W/(m.K)]
Used in
$h_{buried}$
Heat transfer coefficient wall to soil [W/(K.m$^2$)]