Cableizer

Convective heat transfer cable→riser/tray

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

Symbol
$W_{conv,int}$
Unit
W/m
Formulas
$h_{conv,int} \pi F_{eq} D_{o} \left(\theta_{e}-\theta_{di}\right)$riser
$h_{conv,int} w_{t} \left(\theta_{e}-\theta_{tw,it}\right)$tray
Related
$D_{o}$
Outer diameter [m]
$F_{eq}$
Factor for envelope circle for a group of equal circles
$h_{conv,int}$
Heat transfer coefficient convection cable—riser/tray [W/(K.m$^2$)]
$\pi$
Archimedes' constant $\pi$
$\theta_{di}$
Temperature duct inner surface [°C]
$\theta_{e}$
External temperature object [°C]
$\theta_{tw,it}$
Temperature tray wall (inner) top cover [°C]
$w_{t}$
Width (inner) [m]
Used in
$T_{4i}$
Thermal resistance medium in the duct [K.m/W]
$T_{conv,int}$
Thermal resistance convection cable—riser [K.m/W]