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Ambient air temperature

For cables in troughs, this is the temperature of the ambient air above ground. This is taken as the inital air temperature inside the air-filled trough.

Symbol
$\theta_{air}$
Unit
°C
Used in
$\Delta \theta_s$
Temperature difference surface to ambient [K]
$\mathrm{Gr}_{ext}$
Grashof number, duct in air
$\mathrm{Gr}_{gd}$
Grashof number, gas to duct
$\mathrm{Gr}_{og}$
Grashof number, object to gas
$h_{rad,ext}$
Radiation heat transfer coefficient, duct to air [W/(K.m$^2$)]
$\mathrm{Ra}_{ext}$
Rayleigh number outside riser
$T_{4iii}$
Thermal resistance to ambient [K.m/W]
$T_{air}$
Absolute air temperature [K]
$\theta_c$
Temperature of conductor [°C]
$\theta_{film}$
Film temperature [°C]
$\theta_{gas}$
Gas temperature [°C]
$\theta_{init}$
Air temperature with no load [°C]
$W_{conv,ext}$
Convection heat transfer, duct to air [W/m]
$W_{conv,gd}$
Convection heat transfer, gas to duct [W/m]
$W_{rad,ext}$
Radiation heat transfer, duct to air [W/m]