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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