Effect of hydrogen addition in a diesel engine fuelled with diesel and canola biodiesel fuel: Energetic-exergetic, sustainability analyses

Abstract

In this study, the influence of diesel and biodiesel fuels with various flow rate of hydrogen (3 L per minute and 6 L per minute) addition through the intake manifold of a diesel engine was investigated at three different engine speed (1500 rpm, 1800 rpm, and 2100 rpm) by considering second law of thermodynamic as a different perspective. Energy, exergy, and sustainability analysis were evaluated by utilizing the data from the experiments. According to the results, it is enlightened that useful work energy ascends with the hydrogen addition in all engine speeds and the net work rates of all test fuels were found as highest at 1800 rpm engine speed while the rate of energy heat loss decreased with hydrogen addition. Furthermore, exergy input is also increased with the hydrogen addition to the engine whereas exergy destruction and exergy heat lost decreased with the increment of the hydrogen. The highest values of energy efficiency and exergy efficiency obtained at 1800 rpm engine speed by using diesel fuel with 6 L per minute hydrogen addition as 38.67 % and 35.09 %, respectively. The highest entropy generation occurred at 2100 rpm as 0.288 kW/K for the biodiesel fuel and the lowest value was observed as 0.201 kW/K for DH6 fuel at 1800 rpm. The analyses showed that the sustainability index values determined to be in the range of 1.437–1.541 and the increase in hydrogen ratio enhanced the sustainability index at all engine speeds and the DH6 and BH6 fuels are more sustainable fuels than the other experimental fuels.