Wind turbine efficiency - how to choose a wind turbine?
When you choose a wind turbine, there are many factors to be considered: wind speed, height, rotor diameter and other factors. In this article, we will tell you how to calculate the wind turbine efficiency, if you have decide a rated power wind turbine. For example, if you decide to buy a 10kw wind turbine, how to compare the wind turbine efficiency between different wind turbines?
There are only two factors: wind utilize ratio and generator efficiency
Wind utilize ratio:
This ratio is usually from 0.40 to 0.45. This means that how much percent wind power could be captured by the wind blades. The maximum ratio is 0.59 in theory; however 0.45 is very good in reality wind turbine industry. So when you choose a wind turbine, you should compare the wind utilize ratio.
As we know, generator will lose some power in the process that converts the wind power to electricity. This loss can not be avoided but a good generator could reduce the loss and increase the efficiency. Generator efficiency is usually from 75% to 85% now. This efficiency factor will decide different output power from a same rated wind turbine.
When you choose a wind turbine, these two factors will help you find a more efficient wind turbine. Of course, price of a wind turbine is another important factor.