Thermal resistance insulation

This is the thermal resistance of the insulation layer without conductor shield and insulation screen.

Symbol

$T_{ins}$

Unit

K.m/W

Formulas

$\frac{\rho_i}{2\pi} \ln\left(\frac{D_{ins}}{D_{ins}-2t_{ins}}\right)$

Related

$D_{ins}$

Diameter over insulation [mm]

$\pi$

Archimedes' constant $\pi$

$\rho_i$

Thermal resistivity insulation material [K.m/W]

$t_{ins}$

Thickness insulation [mm]

Used in

$\Delta \theta_i$

Temperature difference insulation [K]

$T_1$

Thermal resistance conductor—sheath [K.m/W]

$T_i$

Thermal resistance insulation [K.m/W]

$\theta_i$

Temperature of insulation [°C]

$U_{wall}$

OHTC pipe wall [W/(K.m$^2$)]