Temperature of heat source

Symbol
$\theta_{hs}$
Unit
°C
Formulae
$\theta_a+v_4 \Delta \theta_p-\left(v_4-1\right) \Delta \theta_x+\left(T_{4iii}+T_{4db}\right) v_4 W_{hs}$Heat sources buried
$\frac{W_{hs} T_{st} T_{sa}+\theta_t T_{sa}+\theta_{at} T_{st}}{T_{sa}+T_{st}}$Heat sources in tunnel
$\theta_{at}+T_{4iii} W_{hs}$Heat sources in trough
$\theta_a+v_4 \Delta \theta_p-\left(v_4-1\right) \Delta \theta_x+\left(T_{4iii}+T_{tr}\right) v_4 W_{hs}$Heat sources in filled troughs