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Thermal resistivity of duct material

According to standard IEC 60287-2-1 with exception to metal, where the thermal conductivity of wrought iron/steel with a value of 59 W/(m.K) is taken instead.

Symbol
$\rho_d$
Unit
K.m/W
Related
$M_d$
Material of duct pipe
Used in
$T_{4d}$
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]
Choices
MaterialValue
PE3.5
PP4.5
PVC6.0
WPE3.5
Metal0.017
Fibre4.8
Earth1.2
Cem2.0