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Duct material

Cables in ducts which have been completely filled with a pumpable material having a thermal resistivity not exceeding that of the surrounding soil, either in the dry state or when sealed to preserve the moisture content of the filling material, may be treated as directly buried cables.

Symbol
$M_d$
Related
$\rho_d$
Thermal resistivity duct material [K.m/W]
$\sigma_d$
Volumetric heat capacity duct material [J/(K.m$^3$)]
$U_d$
Constant U for cables in ducts [K.m/W]
$V_d$
Constant V for cables in ducts [K.m/W]
$Y_d$
Constant Y for cables in ducts [K.m/W]
Choices
IdMaterial
PEduct made of plastic PE (polyethylene)
PPduct made of plastic PP (polypropylene)
PVCduct made of plastic PVC (polyvinylchloride)
WPEduct made of plastic filled with water
Metalduct made of steel
Fibreduct made of fibrous material
Earthduct made of earthenware
Cemduct made of cement