# Convection heat transfer, gas to duct

Radiation heat transfer from gas in duct to inner wall of the duct used for riser/J-tube.

Symbol
$W_{conv,gd}$
Unit
W/m
Formulae
$h_{conv,gd} \pi D_{di} \left(\theta_{gas}-\theta_{di}\right)$
Related
$D_{di}$
$\theta_{di}$
$\theta_{gas}$
Used in
$T_{4i}$
$W_{conv,od}$