EGR 1301 Lecture Notes - Lecture 27: Wind Turbine, Bioenergy, Wind Speed
7 Dec 2016
School
Department
Course
Professor
Document Summary
Uneven distribution of heat creates wind. The taller the windmill, the more powerful (since wind speed increases as altitude. Iowa, nebraska, kansas, west texas lots of windmills increases) Pros: windmill cost coming down, no pollution, throughout the day, still use land. Cons: fluctuates on a daily & seasonal basis, mostly in rural areas, nmby - noise and view, electricity storage difficult to store, so must put out on grid. 4m/s annual average is the minimum required. Good resource: coastal area, crests of long slopes, passes, open terrain, valleys that channel winds. Typically windier in: winter than summer, day than night. Basic calculations: power density: ke = mv^2, for a constant wind speed v, cross sectional area a and given period of time,t , and air density, . Air mass m= avt: so: ke = atv^3, power= energy/time, wind power:p = av^3. Power output from a wind turbine is given by: pt = cp av^3.
