Cableizer
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Heat removed by air at z

Heat removed by the air in the tunnel at the point z in the cable route, which is equal to $C_{av}\frac{\partial{\theta_{at}(z)}}{\partial{z}}$.

Symbol
$W_{a,z}$
Unit
W/m
Formulae
$\frac{\left(T_t+T_e\right) N_{sys} N_c W_{tot}-\theta_{at,z}-\theta_a}{T_a+T_t+T_e}$
Related
$N_c$
Number of sources in system
$N_{sys}$
Number of parallel systems in the same confinement
$T_a$
Star thermal resistance of air [K.m/W]
$T_e$
External thermal resistance of tunnel [K.m/W]
$T_t$
Star thermal resistance of tunnel [K.m/W]
$\theta_a$
Ambient temperature [°C]
$\theta_{at,z}$
Air temperature in tunnel at z [°C]
$W_{tot}$
Total losses per object [W/m]
Used in
$\theta_{o,z}$
Temperature of the surface of object at z [°C]
$\theta_{t,z}$
Temperature of tunnel wall at z [°C]