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Apportioning factor jacket

Factor for apportioning the thermal capacitance of a cable jacket/oversheath

Symbol
$p_j$
Formulas
$\frac{1}{2\ln\left(\frac{D_e}{D_{ar}}\right)}-\frac{1}{\left(\frac{D_e}{D_{ar}}\right)^2-1}$
Related
$D_{ar}$
Diameter over armour [mm]
$D_e$
External diameter object [mm]
Used in
$C_{c4}$
Thermal capacitance part 4 [J/(m.K)]
$Q_{B,d}$
Thermal capacitance B transient thermal circuit, duct [J/(m.K)]
$Q_{B,j}$
Thermal capacitance B transient thermal circuit, jacket [J/(m.K)]