Convection heat transfer coefficient, duct to air

Symbol
$h_{conv,da}$
Unit
W/(K.m$^2$)
Formulae
$\frac{\mathrm{Nu}_{da} k_{gas}}{L_d}$natural convection (no wind)
$\frac{2\mathrm{Nu}_{da} k_{gas}}{D_{do}}$forced convection due to wind (>0.5 m/s)
$\left({h_{laminar}}^2+{h_{turbulent}}^2\right)^{0.5}$natural and forced convection at low wind speed (≤0.5 m/s)
Related
Used in