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Mean temperature of the medium in the duct

This is the mean temperature of the medium filling the space between cable and duct.

With crossing heat sources, a temperature rise of $\Delta\theta_{0x}$ applies at the hottest point.

Symbol
$\theta_{dm}$
Unit
°C
Formulae
$\frac{\theta_e}{2}+\frac{\theta_{di}}{2}$
Related
$\Delta \theta_{0x}$
Temperature rise by crossing heat sources [K]
$\theta_{di}$
Temperature of duct inner wall [°C]
$\theta_e$
External temperature of the object [°C]
Used in
$\mathrm{Gr}_{gd}$
Grashof number, gas to duct
$T_{4i}$
Thermal resistance of medium in the duct [K.m/W]