The adiabatic combustion process

Returning to the general availability equation, for an adiabatie eombustion process between reactants at state X and products at state Y (Fig. 2.7) we may write 

It is convenient for exergy tabulations to associate the term [ —AGq] = Grq — Gpo with the exergy of the fuel supplied (of mass My), i.e. ,0 = [—AGoJ. For a combustion process burning liquid or solid fuel (at temperature Tq) with air (subscript a, at temperature T ]), the left-hand side of the equation may be written as 

For a combustion process burning gaseous fuel (which may have been compressed from state 0 to state l ), the left-hand side of the exergy Eq. (2.41) may be rewritten as 

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