Cableizer

Height (inner)

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.
For cables in trays, this is the inner height of the tray.

Symbol
$h_{t}$
Unit
m
Formulas
$\frac{\pi Di_{t}}{4}$
Related
$Di_{t}$
Diameter (inner) tunnel [m]
$\pi$
Archimedes' constant $\pi$
Used in
$A_{t}$
Cross-sectional area (inner) tunnel [m$^2$]
$d_{t}$
Channel covering [m]
$Di_{t}$
Diameter (inner) tunnel [m]
$Do_{t}$
Diameter (outer) tunnel [m]
$h_{conv,tray}$
Heat transfer coefficient convection riser/tray—air [W/(K.m$^2$)]
$p_{tr}$
Effective perimeter trough [m]
$\phi_{tr}$
Parameter $\phi$ trough
$\mathrm{Ra}_{ext}$
Rayleigh number riser/tray—air
$T_{at}$
Thermal resistance convection air—tunnel [K.m/W]
$T_{conv,SA}$
Thermal resistance convection tray side—air [K.m/W]
$T_{e}$
External thermal resistance of tunnel [K.m/W]
$T_{rad,SA}$
Thermal resistance radiation tray side—air [K.m/W]
$T_{tr}$
Thermal resistance trough [K.m/W]
$\theta_{init}$
Air temperature without load [°C]
$U_{ti}$
Circumference of inner rectangular tunnel wall [m]
$W_{conv,ext}$
Convective heat transfer riser/tray—air [W/m]