Wind turbines having a tower height of 40 meters will be installed at a certain site. There is no wind speed measurement at the site but the roughness coefficient z is known to be 0.28. Calculate the mean wind speed at the site (for h=40 m) by using the data given in a wind map. According to the map the average wind speed for that site is 9 m/sec. Wind maps are drawn for a height of 10 m and Zo=0.03. Effect of surface roughness becomes negligible for heights higher than 60m. U(h)=U(href).- In In h Zo href Zo Parameter Zo Height m Speed m/s Map 0.03 10 9 Site 0.28 40 ?

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