Friday, November 30, 2012

Notes - Chapter 7 Summary

The following notes are taken from Wind Turbine Technology by Ahmad Hemami.
  • Power is proportional to force required to move it and how fast the object moves
    • can be proportional to torque and angular speed for rotational objects
  • Power grasp from wind of a turbine is affected by how fast the turbine rotates and the pitch angle of blades
    • relationship between power grasp and angular speed is not linear
  • TSR is Tip speed ratio, ratio of tip of blade speed to wind speed
    • depends on wind speed and turbine angular speed
  • Power grasp depends on power coefficient not constant for turbine
  • Turbine must operate at a speed where the power coefficient is around maximum value
  • Daily production of turbine
    • based on pattern of wind over 24 hr
    • power multiplied by time for various values of turbine power
  • Annual production is daily production multiplied by operating days while accounting for effect on density and temperature based on season

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