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Thermal resistance pipe wall

Symbol
$T_{4pii}$
Unit
K.m/W
Formulas
$\frac{\rho_p}{2\pi} \ln\left(\frac{Do_p}{Di_p}\right)$
Related
$Di_p$
Inner diameter enclosing pipe [m]
$Do_p$
Outer diameter enclosing pipe [m]
$\pi$
Archimedes' constant $\pi$
$\rho_p$
Thermal resistivity pipe material [K.m/W]
Used in
$\Delta \theta_{air}$
Temperature increase air [K]
$T_{4db}$
Thermal resistance backfill correction [K.m/W]
$T_{4ss}$
Thermal resistance steady-state [K.m/W]
$\theta_{de}$
Temperature duct outer surface [°C]