Air temperature in tunnel increase

Fictitious increase of ambient temperature to account for the ventilation in a tunnel.

Symbol
$\Delta \theta_{0t}$
Unit
K
Formulae
$\frac{\left(T_{e} + T_{t}\right) \left(- \theta_{a} + \theta_{at_{0}}\right) e^{- \frac{L_{T}}{L_{0}}}}{T_{a} + T_{e} + T_{t}}$
$\theta_{a}$
Ambient temperature [$^{\circ}$C]
$\theta_{at_{0}}$
Used in
$I_{c}$
$\theta_{c}$