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Consider a complete combustion process during which the reactants enter the combustion chamber at and the products leave at Combustion is achieved with (a) 100 percent theoretical air, (b) 200 percent theoretical air, and (c) the chemically correct amount of pure oxygen. For which case will the amount of heat transfer be the lowest? Explain.
Because the combustion will be complete in all cases, the enthalpy of combustion will be equal in all cases.
The heat transfer will be same for all cases. The excess amount oxygen and nitrogen enters and leaves the combustion chamber at the same state. Hence there is no effect on the energy balance due to excess gases.
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