Abstract
Biodiesels derived from vegetable oils have a feasible potential to be used as fuels for internal combustion (IC) engines. Among various types of vegetable-oil-based biodiesel, palm-oil-based biodiesel seems to be a promising alternative renewable fuel. Physicochemical properties of palm oil diesel (POD), which is a methyl ester from crude palm oil (CPO) and crude palm stearin (CPS), are similar to petro-diesel. This work presents the performance of a diesel engine run on POD. The experiments were conducted on a small Cussons Petter AC1 diesel engine. Due to lower calorific value, break specific fuel consumption of POD was on average 10% higher than petro-diesel run. However, due to the fuel-borne oxygen in POD, the thermal efficiency of POD was close to petro-diesel operation. The maximum efficiencies are 20% and 21% for POD and petro-diesel, respectively. The emissions of CO and unburnt HC were better with POD having CO 51% and HC 55% lower than petro-diesel run, respectively. However, due to higher combustion temperature and oxygenated fuel, the NOX emission with POD was on average 33% higher than petro-diesel run. During the experiment, with POD the engine performed smoothly, did not exhibit any starting problem and no audible engine knocking was noticed.
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