Friday, November 30, 2012

Notes - Chapter 2 Summary

The following notes are taken from Wind Turbine Technology by Ahmad Hemami.
  • Energy is the potential to do work
    • any moving object has some kinetic energy
    • energy depends on mass and velocity squared
  • Flowing Fluids also contain kinetic energy
    • based on density
    • cross-sectional area
    • speed cubed
  • If in a pipe cross section restricts area, if in free moving air we define a cross section
  • Power is more meaningful than energy
    • Energy in 1sec
    • Energy is Power multiplied by time
  • Power Absorption depends on power in the wind and the power coefficient of the turbine
    • Maximum value is called the Betz Limit
    • 16/27 or 0.59
  • Wind speed is not constant
    • varies from hour to hour season to season
    • varies with height
    • wind pattern needs to be investigated
      • represented by graph
    • changes with terrain
      • top of a hill has greater wind speed than in a valley

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