Abstract
Rubber seed oil (RSO) is one of the vegetable oils that has potential for use as a fuel for diesel engines. Owing to the high viscosity of RSO, its performance is slightly inferior to diesel fuel. Preheating of RSO reduces its viscosity to the level of diesel fuel that improves the fuel spray and atomisation characteristics, leading to complete combustion. In this experimental work, the effect of various fuel inlet temperatures on the performance, emission and combustion characteristics of a single cylinder diesel engine was evaluated. The experimental results show that the brake thermal efficiency increases from 26˙6 to 28˙4% when the fuel is preheated to a temperature of 150°C. It also indicates that there is a reduction in the CO and smoke emissions with preheated RSO. The reduced ignition delay and combustion duration with RSO at 150°C indicates faster heat release and leads to higher thermal efficiency. It is concluded that the performance, combustion and emission characteristics are improved for preheated RSO compared to raw RSO, but it is still inferior to diesel.
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