Track: Systems Dynamics

Abstract

Kinetic wind energy can be utilized as a source of electrical energy, Indonesia has a source of wind energy that is large enough, wind energy occurs because of differences in air pressure between hot air and cold air with the impact of earth rotation. Windmills are one form of utilization of wind energy that is converted to environmentally friendly electrical energy, horizontal axis windmills are wind turbines with horizontal main shafts that are parallel to the ground surface, a parameter that must be considered in horizontal axis windmills is the use of the number of blades and the type of blade used. This study is to analyze the calculation of windmills using three blades with a type of blade, namely NACA Airfoil 63-212 with a lift coefficient of 1.36 and a drag coefficient of 0.48 at an angle of attack 200, to determine the use of a windmill blade against the output power. In this study, the time needed by researchers was one month, and from the results of this study, the highest power was 4540.75 watts at 7 months with a tip speed ratio value of 4.18, at a wheel rotation of 46.16 RPM with the torque of the wheel. 939.71 Nm was produced while the lowest was 1043.16 watts in 11 months with a tip speed ratio of 4.18, at 28.27 RPM of the wheel with the torque of the wheel produced of 352.48 Nm. The coefficient of power (Cp) of the windmill analyzed by the researcher is 0.21 or equal to the efficiency of the windmill is 21%.