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[FAQ]

I have tried to reproduce this and am getting a much larger number. After calculating the heat of reaction for C+O2 -> CO2, I am getting a significantly different value (about 9.24e7 J/kg) than the default.

Answer: The Fluent char material is c. If this is used, along with the reference enthalpy numbers for CO2 and O2, the calculated burnout heat is consistent with the default value. Note that there are a number of forms of solid carbon. Graphite is the naturally occurring one, with a reference enthalpy of 0 J/kg. (Diamond is another.) Char is somewhat different again, and the reference enthalpy is the one that is tuned to give the observed heat of burnout for a representative coal. Some coals may be different in this respect, so we allow a change in the heat of burnout – essentially acknowledging that the coal is of a different formation than the average.