A wind turbine has a rotor diameter of 60 m. The wind speed is 10 m/s. The power coefficient of the rotor is 0.48 and the efficiency of the drive train is 0.9. The air temperature is 15°C, the air pressure is 101 kPa and the density of the air is 1.225 kg/m3.
a. What is the power in the wind (kW)?
b. How much power does the wind turbine produce (kW)?
c. Under other conditions the air temperature is 20°C and the pressure is 84 kPa. How much power does the wind turbine produce in this case?