Abstract
In this study, the effect of the change in compression ratios, fuels and variable specific heat on the energetic, exergetic, and ecological efficiency of methanol, ethanol, iso‐octane & liquefied petroleum gas (LPG) is being investigated in SI engine cycle model. The cycle model consists of compression, combustion, expansion, exhaust and internal heat transfer processes. First and second laws of thermodynamics principle are applied to the cycle model to perform energy and exergy analysis at stoichiometric condition. The exergy of the fuel is being distributed in exergy with internal heat transfer, exergy with net work transfer, irreversibilities during combustion, exhaust gases, compression and expansion processes. The result showed that the first law efficiency, second law efficiency, ecological efficiency, exergy with net work and exergy destruction during compression and expansion process increases with the increase in compression ratio for the all investigated fuels. The results also showed that the irreversibilities during combustion, internal heat transfer and exhaust gases decreases with the increase in compression ratio for all the examined fuels. The specific heats of all the fuels increases from compression to the combustion and decreases slightly during exhaust stroke.
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