Cableizer
Log in

Thermal resistance of the pipe wall

Symbol
$T_{4pii}$
Unit
K.m/W
Formulae
$\frac{\rho_p}{2\pi} \ln\left(\frac{Do_p}{Di_p}\right)$
Related
$Di_p$
Inner diameter of air-filled pipe with objects [m]
$Do_p$
Outer diameter of air-filled pipe with objects [m]
$\pi$
Archimedes' constant $\pi$
$\rho_p$
Thermal resistivity of pipe material [K.m/W]
Used in
$\Delta \theta_{air}$
Temperature increase of air [K]
$T_{4db}$
Correction of thermal resistance for backfill [K.m/W]
$T_{4ss}$
Steady-state thermal resistance [K.m/W]
$\theta_{de}$
Temperature of duct outer wall [°C]