ABSTRACT The energy, exergy and emission performance of a four‐stroke diesel engine fueled with diesel (D100), Waste cooking oil (WCO30), waste plastic oil (WPO30), and their blend (WCO15WPO15) is compared. Energy and exergy analyses showed that the WCO15WPO15 mixture has the highest energy efficiency, approximately 20% (full load), compared to D100, which is 18% (full load). In addition, WCO15WPO15 exhibited higher exergy efficiency and more favorable combustion characteristics, attributed to the interaction between WCO's oxygenation and WPO's increased calorific value. This alternative shows a considerable trade‐off between particulate matter (PM) and nitrogen oxides (NOx) emissions. D100 had PM emissions of more than 2.5 g/kWh at full load, whereas the WCO15WPO15 blend demonstrated less than 2 g/kWh, corresponding to a 20% improvement. At full load, NOx generation of the WCO15WPO15 blend was above 800 ppm, 15% more than D100, due to higher combustion temperature. It was concluded that the WCO and WPO blends, particularly WCO15WPO15, are promising alternative fuels for diesel engines, increasing energy efficiency and reducing PM emissions. Future studies will focus on parameter optimization and exhaust aftertreatment to reduce NOx emissions, enabling cleaner, more sustainable combustion solutions.
Pawar et al. (Tue,) studied this question.
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