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In this study, experimental performance and emission characteristics of biodiesel waste cooking oil water-emulsions were studied. The fuels are compared to several blends by volume: 5% biodiesel waste cooking oil blended with 10% water, and 18.7% emulsions (BD5W10) compared to biodiesel waste cooking oil blended with diesel oil 5% (BD5), 10% (BD10) and pure diesel oil (DO).The experiments were conducted in a four-cylinder turbocharged Yanmar diesel engine at four different loads. During the process of experiments, the engine speed was conducted in 1500 rpm. The experimental results showed that at low load, the thermal efficiency of B5W10 was reached up to 8.92% more than DO. At medium load, the specific fuel consumption of BD5W10 was increased to 11.66% compared to DO. In emissions, CO in BD5W10 was higher than DO and B10. CO 2  emissions in BD5W10 can be reduced to 12.8% compared to DO at high load. The opacity of BD5W10 at middle load can cut up to 84.25% compared to DO. In conclusion, biodiesel cooking oil water-emulsion can be an alternative source of fuel in the future because it can reduce the opacity and is also higher in thermal efficiency.

Performance and emission characteristics of biodiesel waste cooking oil water-emulsions under varying engine load condition