Biodiesel production and performance evaluation of coconut, palm and their combined blend with diesel in a single-cylinder diesel engine

•Palm, coconut and their combined biodiesel blend (PB15CB15) was studied.•Characterization and effect on engine performance and emission was analyzed.•Combined blend improves BP, BSFC and NOx emission compared to coconut.•Combined blend improves CO, HC emissions and BTE compared to palm. Biodiesel i...

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Bibliographic Details
Published in:	Energy conversion and management 2014-11, Vol.87, p.250-257
Main Authors:	Habibullah, M., Masjuki, H.H., Kalam, M.A., Rizwanul Fattah, I.M., Ashraful, A.M., Mobarak, H.M.
Format:	Article
Language:	eng
Subjects:	Applied sciences Biodiesel Blends Brakes Coconut biodiesel Diesel engines Emission analysis Emissions control Energy Energy. Thermal use of fuels Engine emissions Engine performance Engines Engines and turbines Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc Exact sciences and technology Palm Palm biodiesel Palm–coconut blend
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Summary:	•Palm, coconut and their combined biodiesel blend (PB15CB15) was studied.•Characterization and effect on engine performance and emission was analyzed.•Combined blend improves BP, BSFC and NOx emission compared to coconut.•Combined blend improves CO, HC emissions and BTE compared to palm. Biodiesel is a renewable and sustainable alternative fossil fuel that is derived from vegetable oils and animal fats. This study investigates the production, characterization, and effect of biodiesel blends from two prominent feedstocks, namely, palm and coconut (PB30 and CB30), on engines. To aggregate the advantages of high ignition quality of palm and high oxygen content of coconut, combined blend of this two biodiesels (PB15CB15) is examined to evaluate its effect on engine performance and emission characteristics. Biodiesels are produced using the alkali catalyzed transesterification process. Various physicochemical properties are measured and compared with the ASTM D6751 standard. A 10kW, horizontal, single-cylinder, four-stroke, and direct-injection diesel engine is employed under a full load and varying speed conditions. Biodiesel blends produce a low brake torque and high brake-specific fuel consumption (BSFC). However, all emissions, except for NOx, are significantly reduced. PB15CB15 improves brake torque and power output while reducing BSFC and NOx emissions when compared with CB30. Meanwhile, compared with PB30, PB15CB15 reduces CO and HC emissions while improving brake thermal efficiency. The experimental analysis reveals that the combined blend of palm and coconut oil shows superior performance and emission over individual coconut and palm biodiesel blends.
ISSN:	0196-8904 1879-2227