POWER CHARACTERISTICS TESTS ON THE CHANGE OF WIND TURBINE HEIGHT OF VERTICAL AXIS
Abstract
The present study tested the characteristics of a vertical axis wind turbine or so-called
Vertical Axis Wind Turbine (VAWT) with three turbines in which all three turbines have
different dimensions on turbine height. Based on Betz limit theory, the efficiency or the
value of Coefficient Power (CP) wind turbine is not more than 59.3%. In this case CP is
one of the main parameters for obtaining maximum power extracted through the turbine
blades based on the design formed. For VAWT used is H-darrieus type, with height or
height of the blade is 1 m , 1.5 m and 2 m, each wind turbine has 3 blades with water foil
NACA 4412. Each wind turbine is tested at wind speed 0 till 12 m / s. The result shows
the maximum power on the first turbine or with a height of 1 m is 356.46 watts then the
second turbine with a height of 1.5 m is 623.98 watts and the third turbine with a height
of 2 m is 898.45 watts. From this result can be proved that to get big mechanical power
hence required swept area bigger by changing turbine high.
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