Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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The ground level wind velocity at 10m elevation is 8 miles/hr in a city. What would you estimate the velocity to be at 100m elevation, in miles per hour, if there is a B stability class which means the value of the urban exponent (ρ) = 0.15
1. On a particular day, the wind speed is 2 m/s at a height of 10 m. Estimate the wind speed at heights of 100 m and 300 m if the power law exponent on the velocity profile is 0.15 (level ground, little cover). Repeat the estimates for an exponent of 0.4 (urban area). 2. The wind speed over an urban area is 10 m/s at a height of 10 m. Estimate the wind speed at a height of 30 m.
A windmill is operating in a 10m/s wind that has a density of 1.2kg/m3. The diameter of the windmill is 4m. The constant-pressure (atmospheric) streamline has a diameter of 3m upstream of the windmill and 4.5m downstream. Assume that the velocity distributions are uniform and the air is incompressible. Determine the thrust on the windmill.
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