Solar-Assisted Biodiesel Production from Used Cooking Oil
Abstract
The moisture in used cooking oil is a significant factor that affects the quality of biodiesel production. This paper presents biodiesel production by using the solar thermal assisted system for moisture removing which can increase the quality of biodiesel. The cross-flow heat exchanger made by copper tube was installed at the header of the evacuated tube heat pipe solar collector of 2.15 m2. There were two loops of moisture removal in the heat exchanger which one is for used cooking oil, and another one is for biodiesel. The initial moisture content of used cooking oil was 0.08%, and the moisture content after moisture removal was 0%. The biodiesel from 100 liters of used cooking oil flowed into the heat exchanger with a mass flow rate of 0.0076 kg/s. The moisture removing time per cycle was 3.33 hours. The solar irradiation was about 849.4 W/m2, and the heat consumption from solar collector was 1.45 kW that able to increase the temperature of biodiesel from 30oC to be 135.8oC. The average temperature in a reaction tank was 60oC. The yields from 100 liters used cooking oil was 94.37 liters. The final moisture content of biodiesel was 0.005 %Vol. It was found that the properties of biodiesel satisfied with the benchmark of the announcement of the Department of Energy Business. The benefit-cost ratio of this system is about 2.33 while the cost per unit is 25.40 THB/liter.
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