Cableizer
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Number of sources in system

Number of objects of equal size with the same load acting as sources in a system.

Symbol
$N_c$
Related
$D_{eq}$
Equivalent diameter of a group of round objects [mm]
Used in
$A_{d,fill}$
Free cross-sectional area inside duct [mm$^2$]
$CF_{pull}$
Conduit fill [$\%$]
$d_f$
Spacing from hottest object in group [m]
$F_g$
Gravitational force [N/m]
$g_{dry}$
Geometric constant of circle with dried-out soil [p.u.]
$\gamma_t$
Attainment factor for groups of cables
$n_{cc}$
Number of conductors combined
$T_{4t}$
Equivalent thermal resistance for tunnel [K.m/W]
$T_a$
Star thermal resistance of air [K.m/W]
$T_s$
Star thermal resistance of object [K.m/W]
$T_t$
Star thermal resistance of tunnel [K.m/W]
$\theta_{at,L}$
Air temperature in tunnel at outlet [°C]
$\theta_{at,z}$
Air temperature in tunnel at z [°C]
$\theta_{o,L}$
Temperature of the surface of object at outlet [°C]
$\theta_{o,z}$
Temperature of the surface of object at z [°C]
$\theta_{t,L}$
Temperature of tunnel wall at outlet [°C]
$\theta_{t,z}$
Temperature of tunnel wall at z [°C]
$W_{a,L}$
Heat removed by air at outlet [W/m]
$W_{a,z}$
Heat removed by air at z [W/m]
$W_{sys}$
Total losses of the system [W/m]
$\zeta_{er}$
Radiation shape factor for touching cables
Choices
NbType
11 single-core or multi-core
22 single-core
33 single-core