Cableizer
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Outer diameter of duct

If the cable is not in a duct, $Do_d$ is equal to the cable outer diameter $D_e$.

Symbol
$Do_d$
Unit
mm
Used in
$A_d$
Cross-sectional area of duct wall [mm$^2$]
$D_{do}$
Outer diameter of duct [m]
$D_o$
Outer diameter [m]
$h_{lg}$
Ratio of heat dissipation coefficients
$T_{4d}$
Thermal resistance for daily load cycle [K.m/W]
$T_{4ii}$
Thermal resistance of the duct wall [K.m/W]
$T_{4w}$
Thermal resistance for weekly load cycle [K.m/W]
$T_{4y}$
Thermal resistance for yearly load cycle [K.m/W]