Energy-Exergy Analysis of CI Engine Fueled with Moringa Oleifera Biodiesel at Different Loading Conditions

Abstract

This study aims to examine the impact of engine load (3, 6, 9, 12 kg) on the energy and exergetic performance of an internal combustion engine powered by diesel and Moringa biodiesel mixes. The trials were conducted on a common rail direct injection (CRDI) type single-cylinder diesel engine, using diesel fuel and mixes of Moringa biodiesel (MB10, MB20, and MB30) as the fuel. The experiment was conducted at a higher compression ratio (CR) of 18:1, a fuel injection pressure (IP) of 600 bar, an injection timing (IT) of 23^obTDC, and a fixed engine speed of 1500 rpm. An energy and exergy analysis were conducted to estimate the energy and exergy rate of fuel, cooling water, and exhaust gases, unaccounted energy, energy and exergy efficiency, entropy generation, and sustainability index. The energy analysis showed that fuel inlet energy, energy of cooling water, exhaust gases, and energy efficiency rise with engine load, whereas unaccounted energy decrease. Exergy analysis showed that exergy rate of cooling water, exhaust gas, exergy efficiency, and SI increase with engine load, while fuel energy, destructed available energy, and entropy generation decrease. The highest energy and exergy efficiency reported for the diesel were 27.20 and 26.31% respectively while for biodiesel blend MB30 it was reported as 28.13 and 27.21% at full load condition. The highest entropy generation reported for the diesel was 0.022 kW/K at 50% loading condition and for biodiesel blend MB20 it was 0.020 kW/K at full loading condition. The highest SI reported for the diesel and biodiesel blend MB30 were 1.36 and 1.37 at full load condition. A study suggests that the energetic and exergetic performance of a VCR-CRDI type diesel engine is similar to that of diesel fuel when utilizing Moringa biodiesel, under various engine loading conditions.