Cableizer ®

Heat fiber optic cable

A fiber optic cable does not produce any heat on its own

Symbol
$W_{fo}$
Unit
W/m
Formulas
$\frac{\theta_e-\theta_a-v_4 \Delta \theta_p+\left(v_4-1\right) \Delta \theta_x}{\left(T_{4iii}+T_{4db}\right) v_4}$fiber optic cable buried
$\frac{\theta_e \left(T_{sa}+T_{st}\right)-\theta_t T_{sa}-\theta_{at} T_{st}}{T_{st} T_{sa}}$fiber optic cable in ventilated tunnel
$\frac{\theta_e-\theta_t}{T_{4iii}}$fiber optic cable in channel (Heinhold)
$\frac{\theta_e-\theta_{at}}{T_{4iii}}$fiber optic cable in trough
$\frac{\theta_e-\theta_a-v_4 \Delta \theta_p+\left(v_4-1\right) \Delta \theta_x}{\left(T_{4iii}+T_{tr}\right) v_4}$fiber optic cable in filled troughs
Related
$\Delta \theta_p$
Temperature rise by other buried objects [K]
$\Delta \theta_x$
Critical soil temperature rise [K]
$T_{4db}$
Thermal resistance backfill correction [K.m/W]
$T_{4iii}$
Thermal resistance ambient [K.m/W]
$T_{sa}$
Thermal resistance convection object—air [K.m/W]
$T_{st}$
Thermal resistance radiation object—tunnel [K.m/W]
$T_{tr}$
Thermal resistance trough [K.m/W]
$\theta_a$
Ambient temperature [°C]
$\theta_{at}$
Air temperature with load [°C]
$\theta_e$
External temperature object [°C]
$\theta_t$
Temperature wall (inner) [°C]
$v_4$
Ratio thermal resistivity dry/moist soil