Wind Turbine Question?
If i have a wind turbine that produces 37 watts at a speed of 16 km/h. If i increase the speed of the wind, will that in turn increase the amount of power produced?
Answer by Ecko
All things being equal, yes. The power in the wind is proportional to the cube of the velocity. So 3 times the speed gives 27 times the power. For twice the windspeed it is 2 x 2 x 2 = 8 times the power. In practice though there are many factors, depending on the design of the generator, the tower, the turbine itself and the load.
For a modest increase like 16-20km/h the cube law might hold. The ratio 20/16 = 1.25, so the cube of this is 1.25 x 1.25 x 1.25 = 1.95, so approx double the power for that speed change is available in the wind. If the generator and load can handle this increase appropriately, they could produce double the power. The load is important. e.g. if the generator voltage is regulated (constant) and the load is fixed (constant), there is no change in power produced. The load needs to be a sink for power, like charging a battery before it is charged. Even then the maximum current is limited to the generator rating.
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