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Thermal resistance fluid-filled pipe

Thermal resistance of the pipe in the center of a heat source inside which the fluid is flowing, e.g. water in a district heat pipe.

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