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Inner height

For cables in tunnels, this is the inner height of the tunnel (only applicable for rectangular tunnels).

For cables in troughs, this is the inner height of the trough.

Symbol
$h_t$
Unit
m
Formulae
$\frac{\pi Di_t}{4}$
Related
$Di_t$
Tunnel inner diameter [m]
$\pi$
Archimedes' constant $\pi$
Used in
$A_t$
Cross-sectional area of the tunnel [m$^2$]
$d_t$
Channel covering [m]
$Di_t$
Tunnel inner diameter [m]
$Do_t$
Tunnel/trough outer diameter [m]
$p_{tr}$
Effective perimeter of trough [m]
$\phi_{tr}$
Parameter $\phi$ for trough
$T_{at}$
Thermal resistance by convection, air to tunnel [K.m/W]
$T_e$
External thermal resistance of tunnel [K.m/W]
$T_{tr}$
Thermal resistance of trough [K.m/W]
$\theta_{init}$
Air temperature with no load [°C]
$U_{ti}$
Circumference of inner rectangular tunnel wall [m]