Outer diameter

Diameter in meters used to calculate the thermal resistance of cables, ducts or heat source in air or for calculations where metric dimension is required.

Symbol
$D_o$
Unit
m
Formulae
$\frac{D_e}{1000}$Cables not in duct
$\frac{Do_d}{1000}$Cables in duct
$\frac{do_{pipe}}{1000}$Heat sources
$D_{prot}$PAC/GIL
Used in
$A_e$
$A_{er}$
$\alpha_{sa}$
$\Delta \theta_{sun}$
$\mathrm{Gr}_{prot}$
$\mathrm{Re}_{air}$