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Convection heat transfer, duct to air

Convection heat transfer from duct outer surface to ambient air.

Symbol
$W_{conv,ext}$
Unit
W/m
Formulae
$\pi D_{do} h_{conv,ext} \left(\theta_{de}-\theta_{air}\right)$
Related
$D_{do}$
Outer diameter of duct [m]
$h_{conv,ext}$
Convection heat transfer coefficient, duct to air [W/(K.m$^2$)]
$\pi$
Archimedes' constant $\pi$
$\theta_{air}$
Ambient air temperature [°C]
$\theta_{de}$
Temperature of duct outer wall [°C]
Used in
$T_{4iii}$
Thermal resistance to ambient [K.m/W]