Combustion, performance, emission and fatty acid profiles analysis of third generation biodiesels obtained from a recycle and fresh feedstock: a comparative assessment

Abstract

The present paper aims to show the difference between fresh feed oil and waste cooking oil and their effect on Engine performance, Exhaust gases, and Combustion Engine. This study has used waste cooking oil (sheep tallow) (WCO) as well as a new species of algae (Mastocarpus papillatus). The results indicate that the torque, power, brake specific consumption, Exhaust gas temperature, and NOx emission of fresh feed give much closer results to diesel fuel, and their difference for 5% biofuel with WCO is around 2–3%, 2–6%, 6–7%, 1–3%, and 2–9%. The CO, soot, and HC emission of fresh feed nave much better results to diesel fuel, and their difference for 20% biofuel with WCO is around 5–25%, 6–12%, and 11–19%. Compared to waste oil, the peak pressure for fresh feed was lower; therefore, being compared to waste fuel, the fresh feed shows better results for emission and performance in the engine.