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Thermal resistance pipe insulation

Thermal resistance of the insulation around the pipe in the center of a heat source, e.g. a district heat pipe.

Symbol
$T_{hsi}$
Unit
K.m/W
Formulas
$\frac{1}{k_{hsi}} \frac{1}{2\pi} \ln\left(\frac{D_{hsi}}{Do_{hsp}}\right)$
Related
$D_{hsi}$
Diameter over pipe insulation [mm]
$Do_{hsp}$
Outer diameter fluid-filled pipe [mm]
$k_{hsi}$
Thermal conductivity pipe insulation 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]