# Heat of combustion coefficient

The gross heat of combustion value (or energy value or calorific value) is used to quantify the energy content of a cable in case of a fire.

The standard gross heat of combustion is the energy liberated when a substance undergoes complete combustion with oxygen at standard conditions (25$^{\circ}$C and 1 bar). In thermodynamical terms it is the negative of the enthalpy change for the combustion reaction.The chemical reaction is typically a hydrocarbon or other organic molecule reacting with oxygen to form carbon dioxide and water and release heat.It can be calculated from the standard enthalpy of formation ($\Delta$Hf$^{\circ}$) of the substances involved in the reaction, given as tabulated values.The gross heat of combustion is measured in a calibrated oxygen bomb calorimeter. It is usually utilized to quantify the performance of a fuel in a combustion system.

The sources are:

• 'Heats of combustion of high temperature polymers' by Richard N. Walters (2000)
• 'Experimental investigation on the heat of combustion for solid plastic waste mixtures' by Liviu Costiuc (2015)
• Prof. Dr. M. Häberlein
• atozplastics.com (used for PS, PIB)
• 'Heats of combustion of oil shale, bitumen, and their mixtures' by V. M. Abbasov (2008) (used for Bitumen)
• 'Determination of calorific value, sulphur and heavy metal concentration in waste oils' by Thinguri Mwangi Thomas (1998) (used for mineral oil wth 9.093 kcal/g)
• 'Formulation and Burning Behaviour of Fire Retardant Polyisoprene Rubbers' by David John Kind (2001) (used for IIR, NR, CR, CSM)
• Cigré Guide 720 'Fire issues for insulated cables in air' (used for PP, EPR, HFFR, Paper)
• 'Calorific values for different raw materials' by C.F. Nielsen (used for Jute)

Note: Not all values listed below can be selected in the cable editor.

Symbol
$\Delta H_{c}$
Unit
MJ/kg
Related
$H_{c}$
Used in
$H_{c}$
Choices
IdValueReference values
PVC18.017.95-20.0
PE44.644.6-47.7
LDPE44.644.6-47.74
MDPE46.444.6-47.74
HDPE47.7444.6-47.74
XLPE44.644.6-47.74
XLPEf47.7444.6-47.74
PP45.845.8-46.0
PPLP40.950/50% paper/PP, paper 50% soaked oil/rosin
PUR31.6
PS42.041.6-43.65
PA31.431.4-33.0
STPe32.632.6-33.9
POC33.533.5-46.05
ETFE13.8
PET24.1321.6-24.13
PTFE5.0
HFFR20.015.0-25.0
FRNC13.0
NR43.143.1-45.0
EPR30.025.0-33.9
EPDM30.0≈EPR
EVA22.0
CR23.719.5-23.7
CSM15.4
IIR43.8
PIB47.0
Oil35.04paper 50% soaked with mineral oil (38.07)
Mass36.0paper 50% soaked with oil/rosin (ca. 40)
CJ34.2860% jute + 40% PP
RSP43.8IIR
BIT40.95Bitumen
tape20.0estimation
SiR15.515.5-22.6
fPOC16.7550% of POC
fPP22.950% of PP
fPE22.350% of PE
fPVC9.050% of PVC
PRod15.280% of PVC
PTube15.280% of PVC
Jute17.017.0-20.0
TY18.017.0-20.0
Paper16.0
Air8.9