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Öğe Energy and exergy analysis of a diesel engine fuelled with diesel and biodiesel fuels at various engine speeds(Taylor & Francis Inc, 2020) Sanli, Bengi Gozmen; Uludamar, ErincEnergy and exergy analysis of internal combustion engines is a key issue to find out an alternative fuel to conventional diesel fuel since the analyses are indicators of quantity and quality of energy resources. In the present study, exergy and energy analyses of a diesel engine were evaluated when the engine was fuelled with conventional diesel, hazelnut biodiesel, and canola biodiesel fuels. The results of the study depicted that fuel energy conversion to output power and exergy work rate decreased with biodiesel usage in all engine speed. The highest value of thermal efficiency and exergy efficiency were obtained at 1800 rpm for conventional diesel, hazelnut biodiesel, and canola biodiesel fuels. Analyses showed that the lowest destruction occurred at 1800 rpm for all test fuels with the value of 45.45%, 47.36%, and 47.41% for diesel, hazelnut biodiesel, and canola biodiesel, respectively. Furthermore, the entropy generation rate was the minimum at 1800 rpm engine speed for all test fuels.Öğe Evaluation of energetic-exergetic and sustainability parameters of biodiesel fuels produced from palm oil and opium poppy oil as alternative fuels in diesel engines(Elsevier Sci Ltd, 2019) Sanli, Bengi Gozmen; Uludamar, Erinc; Ozcanli, MustafaIn present study, the energetic and exergetic performances of a diesel engine fueled with conventional diesel and various biodiesel fuels were investigated experimentally. Energetic and exergetic performance parameters of the engine fueled with neat diesel, neat opium poppy and neat palm biodiesel fuels were calculated and compared with each other. Moreover, the sustainability analysis was carried out in the study. The findings of this study indicated that the energetic and exergetic performance parameters were profoundly affected by the engine speed and the fuel type. Both the thermal and exergetic efficiencies were the highest at the engine speed of 1600 rpm for all tested fuels. At this engine speed, the lowest thermal efficiency of the engine occurred with palm biodiesel as 34.92%, while the highest thermal efficiency value was 35.85% with diesel fuel. The exergy efficiencies of corresponding fuel types ranged from 32.50% to 33.64% for palm biodiesel and diesel fuels, respectively. In addition, the difference between the exergy efficiencies of diesel fuel and opium poppy biodiesel fuel was about 0.90%. Both the energy and exergy efficiencies diminished with the increment of engine speed higher than 1600 rpm for all fuel types. The maximum values of sustainability index for all fuel types were obtained at the engine speed of 1600 rpm. The best exergetically- sustainable fuel was the diesel fuel followed by the opium poppy biodiesel fuel. According to the results, opium poppy biodiesel might replace with the conventional diesel fuel due to the similarity of energetic and exergetic performance parameters.