An ever increasing demand of fuels has been a challenge for today's scientific workers. The fossil fuel resources are dwindling day by day. Biodiesel has become more attractive recently because of its environmental benefits and the fact that it is made from renewable resources and seems to be a solution for future. Food consumption around the world produces large amounts of waste vegetable oils and fats that, in many world regions, are disposed of in harmful ways. Consequently, this study intended to investigate the feasibility of utilizing this renewable and low cost fuel raw material as a diesel fuel replacement in small scale applications such as in residential heating boilers. Specifically, the study examined the aspects of combustion performance and emissions of biodiesel relative to the baseline diesel fuel in a water-cooled furnace. The combustion efficiency, ηc, and exhaust temperature, Texh, as well as the common pollutants and emissions were tested over a wide range of air/fuel ratio ranging from very lean to very rich. All tests were conducted at two different levels of energy inputs for the fuels. The findings showed that at the tested levels of input energy, biodiesel combustion efficiency was a little inferior to that of diesel fuel due to its higher density and lower heating value while on the other hand, from emissions view points, biodiesel emitted less pollutants at the whole range of A/F ratio considered.

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