In thermodynamics, exergy is defined as the maximum theoretical work which can be obtained as the system comes to equilibrium with its reference environment. Unlike energy, exergy is not a conserved quantity. It gets destroyed due to the presence of irreversibilities. Exergy analysis involves the concept of exergy transfer associated with heat, work and mass transfers and exergy destruction due to irreversibilities. The magnitude of exergy destruction is a quantitative measure of irreversibilities present in the system. Thus, the knowledge of the magnitude of exergy destruction and identification of the component where maximum exergy destruction occurs can be helpful in the better design of the equipment and selection of appropriate processes for minimizing losses.
Flynn et al.  studied a turbocharged, intercooled diesel engine using second law analysis to evaluate low-heat-rejection engine concepts. They were performed the simulation of engine cycle process. Primus and Flynn  reported a study demonstrating the benefits of using the second law in determining various energy losses in a diesel engine. Defining a thermodynamic system as outside the engine cylinder...
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... was found that when the gas fuel-air ratio increases from 0.3 to 0.8 by 0.1 increments, then the in cylinder temperature, pressure cumulative heat loss increases while the cumulative work exergy and percentage of irreversibiltites decreases.
This study concentrates on the CI engine operation investigation using the SLT (Second law of thermodynamics) . Moreover, the engine cycle analysis with the SLT is termed as exergy which includes the exergy accompanying the heat (EQ), exergy accompanying the exhaust gas, work exergy (EW), irreversible processes that is source of the exergy destroyed (Edest) and chemical exergy (Efch) The main objectives is to create the 4-stroke CI engine model, develop an exergy based CI engine model for optimizing engine performance and to validation the engine model with experimental data. The present study seeks to answer following question:
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