Thermodynamic performance investigation of a diesel engine running on biodiesel derived from pangium edule and cocos nucifera

This study investigates the use of biodiesel derived from Pangium Edule Reinw (Pangium biodiesel) and Cocos Nucifera (palm biodiesel) in diesel engines as alternative fuels. A direct injection (DI) diesel engine simulated via a thermodynamic cycle model for investigation. Thermodynamic and performance parameters and compared for diesel, Pangium biodiesel, and palm biodiesel fuels at two different states. The results displayed that Pangium biodiesel shows a relatively higher cylinder temperature and pressure compared to palm biodiesel and diesel fuel at a lower crank angle. It also means that 100 % biodiesel is capable of performing a smaller engine capacity compared to diesel fuel at similar injection conditions. The brake power declines about 8.1% and 8.3% at 3800 rpm, while brake specific fuel consumption increases about 8.7% and 9.4% at 1900 rpm for Pangium biodiesel and palm biodiesel, respectively. The engine performance for Pangium biodiesel and palm biodiesel significantly improve at the same equivalence ratio condition. However, a more amount of fuel is required, which is approximately 20.7% for palm biodiesel and 8.5% for Pangium biodiesel. The brake thermal efficiency for Pangium biodiesel and palm biodiesel is generally better than diesel fuel.