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Thermal resistance of insulation

Symbol
$T_{ins}$
Unit
K.m/W
Formulae
$\frac{\rho_i}{2\pi} \ln\left(\frac{D_{ins}}{D_{ins}-2t_{ins}}\right)$
Related
$D_{ins}$
Diameter over insulation [mm]
$\pi$
Archimedes' constant $\pi$
$\rho_i$
Thermal resistivity of insulation [K.m/W]
$t_{ins}$
Thickness of insulation [mm]
Used in
$\Delta \theta_i$
Temperature difference across insulation [K]
$T_1$
Thermal resistance between one conductor and sheath [K.m/W]
$T_i$
Thermal resistance of insulation [K.m/W]
$\theta_i$
Temperature of insulation [°C]
$U_{wall}$
OHTC of pipe wall [W/(K.m$^2$)]