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 Post subject: VAWT power Calculation
PostPosted: Sat Feb 11, 2012 12:14 pm 
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This is the formula i used to calculate potential power comming from my VAWT Column-R

P=½pAV³


P = power in watts

p= The air density (1.2kg/m³ @ sea level and 20° C)=1.2

A = The swept area of the turbine blades (m² square meters)=1.7m²

V = wind speed ( meters per second)



the VAWT is 12' tall wings and a 1.5' diameter arc, the swept area A=18 ft² = 1.7m²

Wind speed @ 15 mph = 6.7 m/sec
Wind speed @ 30 mph = 13.4 m/sec

Wind Power at 15 mph is: P=½(1.2)(1.7)(6.7)³ = 307 watts

Wind Power at 30 mph = P=½(1.2)(1.7)(13.4)³= 2454 watts

then we introduce the wind and alternator efficiencies factor:
of Ct and Ca




P=½pAV³CtCa
you could expect about 40% of 60% of the wind power

Wind Power at 15 mph is: P=½(1.2)(1.7)(6.7)³ (.40)(.60)= 74 watts

Wind Power at 30 mph = P=½(1.2)(1.7)(13.4)³(.40)(.60)= 589 watts


Regards
sam

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