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Critical soil temperature

This is the critical temperature of the soil on the boundary between dry and moist zones. If $\theta_x$ < $\theta_o$ no drying-out will occur while the soil around the object will dry out if $\theta_o$ ≥ $\theta_x$.

When calculating drying-out according to IEC 60287, the critical soil temperature is an input value. When using the VDE 0276-1000 method the critical soil temperature is calculated with the given formula.

Symbol
$\theta_{x}$
Unit
°C

Default
50.0

Formulas
$\theta_{a}+\Delta \theta_{x}$
Related
$\Delta \theta_{x}$
Critical soil temperature rise [K]
$\theta_{a}$
Ambient temperature [°C]
$\theta_{o}$
Temperature outer surface [°C]
Used in
$\Delta \theta_{x}$
Critical soil temperature rise [K]