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Star thermal resistance of tunnel

Symbol
$T_t$
Unit
K.m/W
Formulae
$\frac{T_{at} \frac{T_{st}}{N_{sys} N_c}}{\frac{T_{st}}{N_{sys} N_c}+\frac{T_{sa}}{N_{sys} N_c}+T_{at}}$
Related
$N_c$
Number of sources in system
$N_{sys}$
Number of parallel systems in the same confinement
$T_{at}$
Thermal resistance by convection, air to tunnel [K.m/W]
$T_{sa}$
Thermal resistance by convection, surface to air [K.m/W]
$T_{st}$
Radiation thermal resistance, surface to tunnel [K.m/W]
Used in
$\Delta \theta_{0t}$
Air temperature in tunnel increase [K]
$L_0$
Reference length of the tunnel [m]
$T_{4t}$
Equivalent thermal resistance for tunnel [K.m/W]
$\theta_{at,L}$
Air temperature in tunnel at outlet [°C]
$\theta_{at,z}$
Air temperature in tunnel at z [°C]
$\theta_{t,L}$
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]