There are two main designs for wind turbines, horizontal and vertical axis turbines. The horizontal axis design seems to give a better energy output for the same height and space requirement of a vertial axis design, but the vertical axis turbine requires a lower wind speed to initiate energy production. Additionally, vertical wind turbines do not need to be angled in a certain direction and can harvest energy even if the winds change. Because there are different benefits and drawbacks of these two systems, the decision to use one over the other doesn’t always have to do with the efficiency.
Additionally, efficiency of turning wind energy into electricity will change depending on the length of the blade, speed of the wind and the density of the air.
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