# Volumetric heat capacity of armour bedding

Specific isobaric volumetric heat capacity of armour bedding material per K at 20°C

The values are taken from standard IEC 60853-2 Ed.1.0 plus following additions:

• Natural rubber (NR) is assumed to be identica to butyl rubber (IIR)
• Values for polyolefin copolymers (POC) are assumed to be similar to polyethylene (PE)
• Values for chlorosulphonated polyethylene (CSM) are assumed to be similar to polyethylene (PE)
• Values for fibrous polypropylene (fPP), polyolefin copolymers (fPOC), polyethylene (fPE), and polyvinyl chloride (fPVC) are assumed to be 70% of the corresponding solid material
• Values for polypropylene (PP) and silicone rubber (SiR) are taken from professionalplastics.com
• Value for PP laminated paper (PPLP) is assumed to be slightly higher than for paper insulation because the value for oil is given with 1.7 whereas the value for polypropylene lies between 1.7 and 1.9
• Tapes are assumed to be similar to jute

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

Symbol
$\sigma_{ab}$
Unit
J/(K.m$^3$)
Formulae
$\frac{\sigma_{ab,1} t_{ab,1}+\sigma_{ab,2} t_{ab,2}}{t_{ab}}$
Related
$t_{ab}$
$t_{ab,1}$
$t_{ab,2}$
Used in
$Q_{ab}$
Choices
MaterialValue
PE2400000.0
PVC1700000.0
EPR2000000.0
POC2400000.0
IIR2000000.0
NR2000000.0
PP1800000.0
SiR1400000.0
CR2000000.0
CSM2400000.0
CJ2000000.0
RSP2000000.0
BIT2000000.0
fPOC1680000.0
fPP1260000.0
fPE1680000.0
fPVC1190000.0
tape2000000.0