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Convection heat transfer, object to duct

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
Formulae
$h_{conv,int} \pi F_{eq} D_o \left(\theta_e-\theta_{di}\right)$
Related
$D_o$
Outer diameter [m]
$F_{eq}$
Factor for envelope circle for a group of equal circles
$h_{conv,int}$
Convection heat transfer coefficient, object to duct [W/(K.m$^2$)]
$\pi$
Archimedes' constant $\pi$
$\theta_{di}$
Temperature of duct inner wall [°C]
$\theta_e$
External temperature of the object [°C]
Used in
$T_{4i}$
Thermal resistance of medium in the duct [K.m/W]
$T_{conv,int}$
Thermal resistance by convection, object to duct [K.m/W]