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Thermal resistance of fluid-filled pipe

Symbol
$T_{hsp}$
Unit
K.m/W
Formulae
$\frac{1}{k_{hsp}} \frac{1}{2\pi} \ln\left(\frac{Do_{hsp}}{Di_{hsp}}\right)$
Related
$Di_{hsp}$
Internal diameter of fluid-filled pipe [mm]
$Do_{hsp}$
External pipe diameter [mm]
$k_{hsp}$
Thermal conductivity of fluid-filled pipe [W/(m.K)]
$\pi$
Archimedes' constant $\pi$
Used in
$T_{hs}$
Thermal resistance of heat source [K.m/W]
$\theta_{hsi}$
Temperature of pipe insulation [°C]
$\theta_{hsp}$
Temperature of pipe [°C]