urban windpower [RE-wrenches]

[Matt Tritt]

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Hi Joel,

See my arrowed comments B-Low

Matt T

Joel Davidson wrote:

>
> 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

 >Most wind generators start producing useable power..........Some 
produce max power at 20 MPH, some as high as 35.

>
> 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.

 >Some wind generators can induce potentially damaging vibration 
frequencies into their mounting structures, including buildings. Care 
must be taken to make sure that engineering analysis be done prior to 
installing a turbine on non-concrete structures

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

 >Many small wind generators are used for battery charging, while others 
may be used in direct batteryless grid-tied applications

>
> 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

Caveat emptor!

Matt T

>
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