Cableizer ®

Heat dissipation heat source

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

*** These formulae are valid when the outer temperature defines the load.

Symbol
$W_{hs}$
Unit
W/m
Formulas
$\frac{\theta_{e}-\theta_{a}-v_{4} \Delta \theta_{p}+\left(v_{4}-1\right) \Delta \theta_{x}}{T_{4\mu} v_{4}}$heat sources buried
$\frac{\theta_{e} \left(T_{sa}+T_{st}\right)-\theta_{t} T_{sa}-\theta_{at} T_{st}}{T_{st} T_{sa}}$heat sources in ventilated tunnel
$\frac{\theta_{e}-\theta_{t}}{T_{4iii}}$heat sources in channel (Heinhold)
$\frac{\theta_{e}-\theta_{at}}{T_{4iii}}$heat sources in trough
$\frac{\theta_{e}-\theta_{a}-v_{4} \Delta \theta_{p}+\left(v_{4}-1\right) \Delta \theta_{x}}{\left(T_{4iii}+T_{tr}\right) v_{4}}$heat sources in filled troughs
Related
$\Delta \theta_{p}$
Temperature rise by other buried objects [K]
$\Delta \theta_{x}$
Critical soil temperature rise [K]
$T_{4iii}$
Thermal resistance ambient [K.m/W]
$T_{4\mu}$
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
Used in
$\Delta \theta_{s}$
Temperature difference surface—ambient [K]
$T_{surf}$
Absolute surface temperature [K]
$\theta_{c,z}$
Temperature conductor z [°C]
$\theta_{e}$
External temperature object [°C]
$\theta_{hsf}$
Temperature fluid [°C]
$\theta_{hsi}$
Temperature pipe insulation [°C]
$\theta_{hsj}$
Temperature protective jacket [°C]
$\theta_{hsp}$
Temperature fluid-filled pipe [°C]
$W_{h}$
Heat generated by external object [W/m]