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Losses in duct

In case of ducts made of a ferromagnetic steel pipe, the conductor current induces a current in the pipe which causes additional losses. We consider them with a separate loss-factor for cables in a common pipe.

Symbol
$W_{duct}$
Unit
W/m
Formulae
$\lambda_4 W_c$
Related
$\lambda_4$
Loss factor of magnetic steel ducts
$W_c$
Conductor losses [W/m]
Used in
$\Delta \theta_c$
Temperature rise of conductor [K]
$\Delta \theta_{duct}$
Temperature rise by losses in ferromagnetic duct [K]
$\theta_{de}$
Temperature of duct outer wall [°C]