Performance Evaluation of a Diesel Engine Fueled with Methyl Ester of shea Butter
Biodiesel as an alternative fuel for diesel engines has been developed for some three decades now. While it is gaining wide acceptance in Europe, USA and some parts of Asia, the same cannot be said of Africa. With more than 35 countries in the continent depending on imported crude oil, it is necessary to look for alternative fuels which can be produced from resources available locally within any country. Hence this study presents performance of single cylinder diesel engine using blends of shea butter biodiesel. Shea butter was transformed into biodiesel by transesterification process. Tests are conducted to compare the biodiesel with baseline diesel fuel in terms of engine performance and exhaust emission characteristics. The results obtained showed that the addition of biodiesel to diesel fuel decreases the brake thermal efficiency (BTE) and increases the brake specific fuel consumption (BSFC). These results are expected due to the lower energy content of biodiesel fuel. On the other hand while the NOx emissions increased with increase in biodiesel content in the fuel blends, the emissions of carbon monoxide (CO), un-burnt hydrocarbon (UHC) and smoke opacity decreased. The engine performance which indicates that the biodiesel has properties and characteristics similar to diesel fuel and the reductions in exhaust emissions make shea butter biodiesel a viable additive or substitute to diesel fuel.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1327857Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2092
 Bora, DK. 2009. Performance of single cylinder diesel engine with karabi seed biodiesel. Journal of Scientific & Industrial Research. Vol. 68, pp. 960-963.
 Pinner, A. 2007. An investigation into biodiesel and its potential role in the replacement of crude oil. BEng final year project. University of Huddersfield, pp. 1-101.
 Utlu, Z, Ko├ºak, MS. 2008. The effect of biodiesel fuel obtained from waste frying oil on direct injection diesel engine performance and exhaust emissions. Renewable energy. Vol. 33, pp.1936 -1941.
 Enweremadu, CC, Alamu, OJ. 2010. Development and characterization of biodiesel from shea nut butter (Vitellaria paradoxa), International Agrophysics. Vol. 24, pp. 29-34.
 Kac, A. 2001. The foolproof way to make biodiesel.
 Enweremadu, CC, Rutto, HL & Oladeji, JT. 2011. Investigation of the relationship between some basic flow properties of shea butter biodiesel and their blends with diesel fuel. International Journal of Physical Sciences. Vol. 6(4), pp. xxx-xxx (in press).
 Schumacher, LG, Borgelt, LC, Hires, WG, Fosseen, D & Goetz, W. 1994. Fueling diesel engines with blends of methyl ester soybean oil and diesel fuel.
 Lapuerta, M, Armas, O & Rodriguez-Fernandez. 2008. Effects of biodiesel fuels on diesel engine emissions. Progress in Energy and Combustion Science. Vol. 34, pp. 198-223.
 Handbook of emissions reductions with biodiesel. 1999.
 Ullman, TL, spreen, KB & Mason, RL. 1994. Effects of cetane number, cetane improver, aromatics, and oxygenates on 1994 heavy-duty diesel engine emissions. SAE paper 1994, 941020.
 Hansen, KF, Jensen, MG. 1997. Chemical and biological characteristics of exhaust emissions from a DI diesel engine fuelled with rapeseed methyl ester. SAE Paper 1997, 971689.
 Environmental Protection Agency. 2002. Comprehensive Analysis of Biodiesel Impacts on Exhaust Emissions. Draft Technical Report. EPA 420-P-02-001 2002.
 Pinto, AC, Guarieiro, LLN, Rezende, JC, Ribeiro, NM, Lopez, EA, et al. 2005. Biodiesel: an overview. Journal of Brazilian Chemical Society. Vol. 16(16B), pp. 1313-1330.
 Rao, GLN, Sampath, S & Rajagopal K. 2008. Experimental studies on the combustion and emission characteristics of a diesel engine fuelled withused cooking oil methyl ester and its diesel blends. International Journal of Applied Science, Engineering and Technology. Vol. 4(2), pp. 64-70.
 Usta, N. 2005. An experimental study on performance and exhaust emissions of a diesel engine fuelled with tobacco seed oil methyl ester. Energy Conversion and Management. Vol. 46, pp. 2373-2386.