Radiation thermal resistance surface-tunnel

Radiation thermal resistance between cable surface and inner wall of the tunnel.

Symbol
$T_{st}$
Unit
K.m/W
Formulae
$\frac{1}{D_{o} K_{r} K_{t} \pi \sigma \left(\left(\theta_{de} + 273\right)^{2} + \left(\theta_{t} + 273\right)^{2}\right) \left(\theta_{de} + \theta_{t} + 546\right)}$ventilated tunnel multisystem
$\frac{1}{D_{o} K_{r} K_{t} \pi \sigma \left(\left(\theta_{o_{L}} + 273\right)^{2} + \left(\theta_{t_{L}} + 273\right)^{2}\right) \left(\theta_{o_{L}} + \theta_{t_{L}} + 546\right)}$ventilated tunnel IEC 60287-2-3
$\frac{1}{D_{o} K_{r} \alpha_{st} \pi}$channel acc. Heinhold
Related
$\alpha_{st}$
$D_{o}$
$\sigma$
$\theta_{de}$
$\theta_{t}$
$\theta_{t_{L}}$
Used in
$T_{4iii}$
$\theta_{de}$
$\theta_{hs}$