Cableizer
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Cross-sectional area (inner) tunnel

Symbol
$A_t$
Unit
m$^2$
Formulas
$w_t h_t$rectangular shape
$\pi \left(\frac{Di_t}{2}\right)^2$circular shape
Related
$Di_t$
Diameter (inner) tunnel [m]
$h_t$
Height (inner) [m]
$\pi$
Archimedes' constant $\pi$
$w_t$
Width (inner) [m]
Used in
$C_{av}$
Heat capacity of the air flow [W/K]
$Di_t$
Diameter (inner) tunnel [m]
$T_e$
External thermal resistance of tunnel [K.m/W]
$V_{air,min}$
Air velocity required to remove all heat by ventilation [m/s]
$W_{a,L}$
Heat removed by air at outlet [W/m]