Cableizer
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Inner width

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

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

Symbol
$w_t$
Unit
m
Used in
$A_t$
Cross-sectional area of the tunnel [m$^2$]
$Di_t$
Tunnel inner diameter [m]
$Do_t$
Tunnel/trough outer diameter [m]
$H_{tc}$
Parameter H for trough
$H_{ts}$
Parameter H depending on air velocity
$p_{tr}$
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]