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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
$D_o$
Outer diameter [m]
$h_{conv,sa}$
Convection heat transfer coefficient, surface to air [W/(K.m$^2$)]
$\pi$
Archimedes' constant $\pi$
$\theta_e$
External temperature of the object [°C]
$\theta_{film}$
Film temperature [°C]
Used in
$T_{4iii}$
Thermal resistance to ambient [K.m/W]
$T_{conv,sa}$
Thermal resistance by convection, surface to air [K.m/W]