# Convection heat transfer, surface to air

Convection heat transfer from outer surface of PAC/GIL to surrounding air.

Symbol
$W_{conv,sa}$
Unit
W/m
Formulae
$h_{conv,sa} \pi D_o \left(\theta_e-\theta_{film}\right)$
Related
$D_o$
$\theta_e$
$\theta_{film}$
Used in
$T_{4iii}$
$T_{conv,sa}$