Thermal resistivity of armour bedding

Typical values for different materials are listed below.

Values are taken from IEC 60287-2-1 with following additions or deviations:

For Natural Rubber (NR) the value was taken from matweb.com (value for Rubber acc. IEC is 5.0)
The value for fibrous polyolefin copolymer (fPOC) is taken from the book 'Handbook of Polyolefins' by C. Vasile (2000)
The value for fibrous polypropylene (fPP) is taken from Table 1 Thermal conductivity of various fibres (Hearle and Morton, 2008) whereas the IEC 60287-2-1 suggests a slightly higher value.
The value for fibrous polyethylene (fPE) and polyvinyl chloride (fPVC) is considered to be twice the value used for insulation.
The value for the water-blocking tapes is an approximative mean value based on different sources

Note: The value is the average of the thermal resistivities of 1st and 2nd armour bedding layer weighted by their thicknesses.

Symbol

$\rho_{ab}$

Unit

K.m/W

Formulae

$\frac{\rho_{ab,1} t_{ab,1}+\rho_{ab,2} t_{ab,2}}{t_{ab}}$

Related

$\rho_{ab,1}$

$\rho_{ab,2}$

$t_{ab}$

$t_{ab,1}$

$t_{ab,2}$

Used in

$a_{shj}$

$b_{shj}$

$c_{shj}$

$T_2$

$T_{ab}$

Choices