urban windpower [RE-wrenches]

[Joel Davidson]

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Windpower Wrenches,
Please review my short reply to inquiries for urban windpower. Any changes, 
corrections, additions? Thank you for your help.
Best regards,
Joel Davidson

1. Wind power is proportional to the cube of the wind speed. Wind generators 
start producing power at 7 mph wind speed and produce maximum power at 30 
mph. At 15 mph wind speed, power produced is 1/8 maximum power. The average 
wind speed for Los Angeles is 6 mph. Average wind speed in most urban areas 
is under 10 mph. See http://www.bwea.com/ref/faq.html

2. Buildings and tower height and noise levels are governed by zoning 
ordinances. Buildings under wind generators and buildings and trees near 
wind generators create turbulence. At 30 feet above the ground and away from 
all obstacles, wind speed is 1.5 times faster than at ground level. At 100 
feet, wind speed is 2 times faster than at ground level. See 
http://www.bwea.com/you/siting.html

3. Wind generator towers on buildings must be securely fastened which causes 
transfer of vibration and noise to the building.

4. Small wind generators are generally low voltage (12, 24, 48) battery 
chargers as compared to batteryless utility interconnected PV systems.

5. Paul Gipe, wind consultant, is less than optimistic. See 
http://www.wind-works.org/articles/RoofTopMounting.html

6. Additional urban wind info:
http://www.esru.strath.ac.uk/EandE/Web_sites/01-02/RE_info/Urban%20wind.htm
http://www.britishgasnews.co.uk/index.asp?PageID=16&Year=2005&NewsID=670
http://www.timesonline.co.uk/article/0,,2090-1603098,00.html
http://www.psfk.com/2005/05/roof_mounted_wi.html 


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