Keywords: exergy analysis, exergy efficiency, internal combustion engine, optimum speed, energy analysis, Otto cycle, fuel flow rate, combustion air flow rate, engine load, engine speed, engine temperature
Determination of optimum speed of an internal combustion engine by exergy analysis
In this study, energy and exergy analysis are applied to the experimental data of an internal combustion engine operating on the conventional Otto cycle. The data are collected using an engine test unit which enables accurate measurements of fuel flow rate, combustion air flow rate, engine load, engine speed and all the relevant temperatures. Energy and exergy efficiencies are calculated for different engine speeds and compared. Results indicate that energy efficiency is maximum at a speed of 2040 rpm whereas exergy efficiency is maximum at a speed of 2580 rpm.