where N_ CH4 is the molar flow rate of input methane, cp;CH4 the specific heat capacity of methane, MCH4 the molar mass of methane, and
DTCH4 the difference between the reaction temperature and the
temperature of the preheated methane stream, N_ air the molar flow
rate of input air, cp;air the specific heat capacity of air, Mair the molar
mass of air, and DTair the difference between the reaction temperature and the temperature of the preheated air stream. The reaction
enthalpy DHr depends on the reaction temperature, and the values
applied in this study are adapted from [32].
The mass flow rate of methane which is combusted to supply
the energy demand in Concept 1 ðm_ comb:;CH4 Þ is calculated according
to the following equation: