External temperature of the object

With crossing heat sources, a temperature rise of $\Delta\theta_{0x}$ applies at the hottest point.

Symbol
$\theta_e$
Unit
°C
Formulae
$\theta_c-T_1 \left(W_c+\frac{W_d}{2}\right)+n_c \left(T_2 \left(W_c \left(1+\lambda_1\right)+W_d\right)+T_3 \left(W_I+W_d\right)\right)$Cables
$\theta_{hs}$Heat sources
$\theta_a+\Delta \theta_s$PAC/GIL in air
$\theta_a+v_4 \Delta \theta_p+\left(1-v_4\right) \Delta \theta_x+W_{tot} v_4 T_{4\mu}$PAC/GIL buried without duct
$\theta_{di}+T_{4i} n_{cc} W_{tot}$PAC/GIL with duct
$\theta_{at}+\Delta \theta_s$PAC/GIL in trough
$\theta_a+T_{4iii} W_{tot}$PAC/GIL in channel (Heinhold)