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Thermal capacitance of duct filling

Thermal capacitance of the material the duct is filled with such as air, bentonite, oil.

Symbol
$Q_{d,fill}$
Unit
J/(m.K)
Formulae
$\frac{\sigma_{d,fill} A_{d,fill}}{{10}^6}$
Related
$A_{d,fill}$
Free cross-sectional area inside duct [mm$^2$]
$\sigma_{d,fill}$
Volumetric heat capacity of duct filling [J/(K.m$^3$)]
Used in
$Q_{B,d}$
Element B of two-part thermal circuit, duct [J/(m.K)]