WIND MILL POWER station and formulas

1. Energy in the Wind Walt Musial Senior Engineer National Wind Technology Center National Renewable Energy Laboratory Kidwind Teachers’ Workshop May 14, 2005

2. Wind Energy Technology At it’s simplest, the wind turns the turbine’s blades, which spin a shaft connected to a generator that makes electricity. Large turbines can be grouped together to form a wind power plant, which feeds power to the electrical transmission system.

4. The Difference Between Energy and Power Energy Power Quantity Rate Unit kWh kW, MW* Water analogy Gallons Gal / Min Car analogy- - How far? - Gallon of gas Engine HP Cost example 12 ¢/kWh $1,500,000/MW Grid Consumption & production Installed capacity

13. 150 m 2 250 m 2 800 m 2 1,800 m 2 3,700 m 2 1980 1985 1990 1995 2000 A= 12,000 m 2 2005 How big will wind turbines be? . 2010

15. Maximum Possible Power Coefficient

18. Blade Planform Types Which should work the best?? Rectangular Reverse Linear Taper Linear Taper Parabolic Taper

19. Airfoil Nomenclature w ind turbines use the same aerodynamic principals as aircraft α V R = Relative Wind α = angle of attack = angle between the chord line and the direction of the relative wind, V R . V R = wind speed seen by the airfoil – vector sum of V (free stream wind) and ΩR (tip speed). V ΩR Ωr V

27. Sirocco A warm wind of the Mediterranean area, either a foehn or a hot southerly wind in advance of a low pressure area moving from the Sahara or Arabian deserts Questions