How much energy can a wind turbine produce
Wind turbines are devices that convert kinetic energy from winds into mechanical energy to a rotating shaft and then further converted by a generator into electrical energy. So how much energy can a wind turbine produce? Well, wind turbines have their limitations, but in an ideal case, where all the kinetic energy is transformed into electricity, the formula would be : (density of air) x (turbine blade diameter)squared x (velocity of wind)cubed x (a constant) = total wind energy
What this means is that the power of the wind that goes into a wind turbine depends on the density of the air, the turbine blade diameter squared (x times x) and the velocity of wind to the third power (x times x times x) and a constant.
If a turbine would convert all wind energy into mechanical power, it would be 100 percent efficient. The reality is that even if a turbine would achieve 50 percent efficiency, it would be a very efficient machine. It would mean that it converts half of the power of the wind.
All turbines have a “design point” that defines the peak efficiency at a given wind speed. Wind speeds above or below that peak efficiency will cause a loss of efficiency. In fact, most of the time, a wind turbine operates at less than its peak efficiency, due to wind speeds never being constant or average.
The electric power actually produced will be even lower since the generator efficiencies are at about 90 percent at best, not to mention further losses in lines and conversion electronics. The final efficiency rate should be about 35 percent at the very best and an average around 20+ percent.
Figuring out how much energy can a wind turbine produce is essential in deciding either you can or not use one at your site, how much downtime will it have and also if the money invested can be recuperated in an optimum amount of time.