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Thermal capacitance insulation, 1st portion (IEC 60853)

his corresponds to $\sigma\cdot{A_i}$

Symbol
$Q_{it1}$
Unit
J/(m.K)
Formulas
$\frac{\frac{\sigma_i \pi}{4} d_{ct} \left(D_{it}-d_{ct}\right)}{{10}^6}$
Related
$d_{ct}$
External diameter conductor, transient [mm]
$D_{it}$
Diameter over insulation, transient [mm]
$\pi$
Archimedes' constant $\pi$
$\sigma_i$
Volumetric heat capacity insulation material [J/(K.m$^3$)]
Used in
$Q_A$
Thermal capacitance A transient thermal circuit [J/(m.K)]
$Q_{B,i}$
Thermal capacitance B transient thermal circuit, insulation [J/(m.K)]