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WindCalc - ME 417 Design of Alternative Energy Systems Wind...

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1 ME 417 Design of Alternative Energy Systems Wind Energy Calculations Effect of Elevation on Wind Speed To calculate the wind speed at one height, if it is known at another height, we can use n 1 2 1 2 h h v v = r r where n is the ground surface friction coefficient and takes on different values according to the nature of the terrain. Some example values are water or smooth flat ground: n = 0.1 tall crops: n = 0.2 city downtown: n = 0.4 Wind Power The power of the wind can be calculated from 3 v A 2 1 W r & ρ = where ρ : density of the air A: capture area of the wind v r : wind speed Wind Turbine Efficiency The efficiency of a wind turbine is defined as 3 wt wt v A ) 5 . 0 ( W power wind produced power turbine ind w r & ρ = = η Then the power of a wind turbine is given by 3 wt wt v A 2 1 W r & ρ η =

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ME 417 Design of Alternative Energy Systems 2 The efficiency for several different types of wind turbines is given in the figure below.
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WindCalc - ME 417 Design of Alternative Energy Systems Wind...

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