Abstract
The system input and output exergy at each portion of an ideal Otto cycle, as well as the process effectiveness, are calculated for compression ratios of 3.0:9.0 and air/fuel equivalence ratios of 0.25:1.0. For comparison, the energy-based efficiencies are also calculated. It was found that both effectiveness and efficiency increase with compression ratio and with air-to-fuel ratio (but at different rates), and that the effectiveness does not vary much when the air-to-fuel ratio increases above 200%. It was also shown that exergy analysis represents the losses in the cycle, such as in the combustion and exhaust processes, much more realistically than the conventional first-law analysis and serves as a good guide for cycle improvements. Several recommendations are made in that direction.
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