Cableizer ®

Radiation heat transfer cable—riser

Radiation heat transfer from envelope around cables to inner wall of the duct used for riser/J-tube.

Symbol
$W_{rad,int}$
Unit
W/m
Formulas
$\sigma A_{er} K_{r} \left(\left(\theta_{e}+\theta_{abs}\right)^4-\left(\theta_{di}+\theta_{abs}\right)^4\right)$
Related
$A_{er}$
Surface of object [m$^2$]
$K_{r}$
Radiation shape factor
$\sigma$
Stefan Boltzmann constant [W/m$^2$K$^4$]
$\theta_{abs}$
Absolute temperature [K]
$\theta_{di}$
Temperature duct inner surface [°C]
$\theta_{e}$
External temperature object [°C]
Used in
$T_{4i}$
Thermal resistance medium in the duct [K.m/W]
$T_{rad,int}$
Thermal resistance radiation cable—riser [K.m/W]