Bio-briquette is a solid fuel made from organic waste and mixed with other materials and then printed using a certain pressure to get the desired shape and characteristics. This research is focused to know the influence of variation of pressure on the density, moisture content and combustion rate on the bio-briquette of sengon wood waste with variation of pressure 45 kg / cm2, 80 kg/cm2, 115 kg /cm2, 150 kg/cm2. Use of this research obtained the highest density 0.47 g/cm3 on the bacon of sengon wood bio-briquette with the pressure of 150 kg/cm2, the highest moisture value is 6.6 % in the bacon of sengon wood bio-briquette with pressure 150 kg/cm2 and burning at an average of 0,35 g /min of sengon wood waste with a pressure of 150 kg /cm2. The greater the pressure the higher the density, the lower the water content and the lower the burn rate.
Wind energy is a renewable energy that is easily obtained and friendly to the environment. The Darrieus wind turbine is a turbine model that is suitable for use in areas with low wind speeds. A Gurney Flap can be added to an aerodynamic device, such as a car spoiler, to improve the spoilers performance. In this study, Gurney Flaps were added to the Darrieus wind turbine to increase the turbines performance. The research objective was to study the effect of the Gurney Flap addition on the Darrieus wind turbine characteristics and the optimum geometry of the Gurney Flap. An experimental study was conducted on conventional Darrieus wind turbines and modified Darrieus wind turbines with the addition of Gurney Flaps, with angle variations of 90°, 120°, and 150° at the height of the Gurney Flap at 2% of the chord length. Each variation was tested at wind speeds of 7 m/s, 8 m/s, and 9 m/s. The experiment result angle variation of 120⁰ obtained the best (Cp) power coefficient of 0.228 at a TSR of 1.166.
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