Thermal resistance of medium in the air-filled pipe with objects

Thermal resistance between ducts and air-filled pipe based on IEC 60287-2-1 Ed.2.0 for cables in ducts.

Symbol
$T_{4pi}$
Unit
K.m/W
Formulae
$\frac{U_p}{1+0.1\left(V_p+Y_p \theta_{pm}\right) D_{eq}}$