A diesel engine test using waste cooking oil biodiesel fuel was run to

A diesel engine test using waste cooking oil

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from vegetable oils or animal fats by transesterification process. A diesel engine test using waste cooking-oil biodiesel fuel was run to investigate engine perfor- mance. By adding 20% of waste cooking-oil biodiesel by volume, there were increase in specific fuel consumption and decrease in thermal efficiency for biodiesel blends compared to diesel fuel [1–5] . Vegetable oils caused operational and durability problems when used in diesel engines. These problems are attributed to higher viscosity and lower volatility of vegetable oils. Transesteri- fication was an effective method of reducing vegetable oil viscosity and eliminating operational and durability problems. Waste cooking-oil biodiesel was used in diesel engines at a rated speed of 1500 rpm and different engine loads. Exhaust gas temperatures of biodiesel blends are increased with increasing biodiesel concen- tration. Performance characteristics of waste cooking-oil biodiesel blends were close to diesel fuel. Waste cooking-oil biodiesel heat- ing value is lower that of diesel fuel by about 15% [6] . Increase of waste cooking-oil biodiesel percentages in diesel- biodiesel blends led to higher exhaust gas temperatures of waste cooking-oil biodiesel blends in the engine fuelled by biodiesel blends. Increase in specific consumptions had been resulted when using biodiesel blends compared to diesel fuel due to the lower heating value of biodiesel and its blends. Also a decrease in the thermal efficiency of biodiesel blends with the increase in percent- age of biodiesel [7–10] . Waste cooking-oil biodiesel blends of B5 and B10 were used in a single cylinder diesel engine and compared to diesel fuel. Biodiesel blends resulted in increase in specific fuel consumption up to 4% and reduction in thermal efficiency up to 2.8% [6] . Experimental tests were conducted on a direct injection diesel engine using diesel fuel, biodiesel and their blends to study engine performance
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parameters under different engine loads at an engine speed of 1500 rpm. Blended biodiesel fuels containing 19.6, 39.4, 59.4 and 79.6% by volume of biodiesel corresponding to 2, 4, 6 and 8% by mass of oxygen in the blended fuel were tested. Biodie- sel blends were prepared from waste cooking-oil by transesterifi- cation process. It was noticed that specific fuel consumptions of biodiesel blends increase than that of diesel fuel, but there was decrease in thermal efficiencies for biodiesel blends compared to diesel fuel [5] . Four tested diesel-biodiesel blends fuels; diesel fuel, waste cooking-oil biodiesel (B5), waste cooking- oil biodiesel (B20), and waste cooking-oil biodiesel (B30), were investigated in a diesel engine at different engine loads. Specific fuel consumptions were found higher for biodiesel blends because biodiesel has lower heat- ing value compared to diesel fuel [11] . Waste cooking-oil biodiesel blends with diesel fuel of 20, 40, 60 and 80% by volume had been tested in a single cylinder, water cooled diesel engine. Exhaust gas temperatures for biodiesel blends were higher compared to diesel fuel. The experimental results proved that lower and
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