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The idea of using biodiesel as substitute fuel for fossil diesel is promising. The boom in biodiesel, however, has raised increasing concern about food shortage throughout the world and may translate into a food crisis. To avoid using food resources for fuel purposes, huge emphasis is currently being put on shifting to alternative non-food feedstocks including waste cooking oils. This study investigated the effects of biodiesel derived from waste palm oil-based cooking oil on performance, exhaust emissions and combustion characteristics in a light duty compression ignition engine. A total of three sets of fuel blends were studied: 10%, 20% and 30% volumetric blends (B10, B20 and B30) of waste cooking oil methyl ester (WME) with fossil diesel. In this study, the experimental work was carried out with a single cylinder, four-stroke, direct injection compression ignition engine. The experiments were conducted under constant torque of 20 Nm and at five different engine speeds.

The use of diesel engines is increasing rapidly thanks to their superior fuel economy, higher efficiency and excellent reliability. The energy crisis of fossil fuel depletion, rising price of diesel and environmental degradation have triggered a search for clean, sustainable and alternative fuels for internal combustion engines. Biodiesel is one of the most promising and demanding alternative fuels because it is a biodegradable, non-toxic and renewable fuel. In the present work, an experimental investigation on the effect of injection timing on engine performance, emissions and combustion characteristics with coconut oil methyl ester (CME) was conducted in a high-pressure common-rail direct injection diesel engine. The tests were performed at constant speed of 2000 rpm and 50% throttle position operation. The test fuels included baseline diesel fuel and two different fuel blends of CME (B20 and B40).

Fossil fuel is depleting due to increase in usage and we are facing energy crises. For us to get out of such plight situations, scientists are looking into alternative ways to produce energy that can be attained at low cost and also eco-friendly. Biodiesel can be an effective solution in spite of some limitations to use as fuel because of poor fuel properties. From this point of view, experiment had been conducted to improve fuel properties of palm biodiesel by blending with coconut and jatropha biodiesel. MATLAB optimization tool was used to find out the optimum blend ratio to achieve overall better fuel properties. Linear relationship among the fuel properties was considered for MATLAB coding. The resultant optimum blend ratio and the equations of the MATLAB code were used to predict the fuel properties values and the experimental fuel properties values of the optimum blends were compared with the predicted values.

Palm is an edible feedstock which is immensely popular in Malaysia as an alternative fuel which can substitute diesel fuel. However, use of Palm biodiesel in diesel engine have a negative effect on food security, thus, in this study authors used Mustard biodiesel, which has poor fuel properties, with Palm biodiesel to produce an optimum blend. This blend will have better fuel properties compared to Mustard biodiesel and will help eliminate dependency of Palm biodiesel. To ensure that optimized blend achieves better fuel properties MATLAB optimization tool was used to find out the optimum blend ratio. Linear relationship among the fuel properties was considered for MATLAB coding. The resultant optimum blend is represented by PM. Optimum blend revealed improved fuel properties compared to mustard biodiesel.