In this work, the exergetic parameters of a diesel engine are analysed using the second law of thermodynamics. The engine runs with diesel and biogas in dual fuel mode of operation. The fuel exergy, exergy destroyed and exergy efficiency in dual fuel mode of operation at different load conditions are compared with the corresponding values of diesel fuel mode. Taguchi method of optimization is used for both the modes of operation using MINITAB software. Confirmation experiments are conducted to verify the Taguchi results, which are found to be equal or nearer to the experimental data. The results of dual fuel mode offer similar trends of exergetic performances to that of diesel fuel mode of operation.

diesel, biogas, dual fuel, exergy, C.I. engine, Taguchi method, S/N ratio.