Heat dissipation of heat source

A heat source is defined as having a positive heat dissipation, whereas a heat sink is defined by a negative value.

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