
























Wind Turbine Comparison Calculator















Wind Turbine Comparison (Wind Generator)
should be made easy.
When your wind turbine choices do not list their Power Output at equal Wind
Speeds, try this calculator out to get a direct comparison.


Evaluate
your location using a precision anemometer to obtain high quality wind speed
data for your wind turbine


 Investment in a wind turbine can be substantial, thus it is essential to have a clear picture of your choices...a direct comparison between wind turbines helps.
 Evaluate your location using a precision anemometer to obtain high quality wind speed data for your wind turbine.
 Compare efficiency and power output based on manufacturer claimed data for different wind turbines.
 Compare manufacturer data to maximum theoretical values.
 Include effects of weather conditions, temperature, height above sea level, and humidity in your results.
 This calculator computes the Weibull wind speed distribution for your location based on average wind speed data and Weibull shape parameter which can be accurately obtained with one of the following wind speed data logger kits.




YOUR WIND SPEED



Your AVERAGE Wind Speed




m/s


ft/s


kph


mph


knots


Your Wind Speed
Distribution Shape β

Determines how often each wind speed occurs
relative to all other wind speed during a period of time.



(unitless)


If in doubt use 2 or obtain a wind
data logger that can calculate it for you.

1+1/β =



Your Minimum Wind
Speed δ

Minimum wind speed should be set to zero unless
you are in a location of strong trade winds and zero wind speed may never
occur.



m/s




Calculated 
Weibull Scale Parameter Θ

Wind speed distribution Weibull Scale Parameter
calculated from distribution average and shape.



m/s


Gamma Function Γ =


4.41

9.61

11.61

8.07

3.34

0.76

0.07


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Wind Turbine 1
Data


Wind Turbine 2 Data for
comparison


Turbine 1, Quoted
(Claimed) Power Output & Wind Speed

Turbine 2, Quoted (Claimed) Power Output & Wind
Speed


Quoted Power Output =


Watts


kW

Quoted Power Output =


Watts


kW


Wind
Speed
(at quoted Power Output) =


m/s


mph

Wind Speed
(at quoted Power Output) =


m/s


mph


Cut In Wind Speed =


m/s


mph

Cut In Wind Speed =


m/s


mph


Cut Out Wind Speed =


m/s


mph

Cut Out Wind Speed =


m/s


mph


Calculated
Turbine Efficiency =


Max theoretical
efficiency can be 59.3%

Calculated Turbine
Efficiency =


Max theoretical
efficiency can be 59.3%


Turbine 1, type
& size Data

Turbine 2, type & size Data


Wind Turbine Type =



Wind Turbine Type =



Diameter =


meters


ft

Diameter =


meters


ft


Height =


meters


ft

Height =


meters


ft


Turbine Swept Area =


meters^{2}


ft^{2}

Turbine Swept Area =


meters^{2}


ft^{2}


Effective Swept Area =


meters^{2}


ft^{2}

Effective Swept Area =


meters^{2}


ft^{2}


Small
Wind Max Estimate
based on Literature =


Propeller (HAWT) =
45% max
Wind Mill (VAWT) = 40% max

Small Wind Max
Estimate
based on Literature =


Propeller (HAWT) =
45% max
Wind Mill (VAWT) = 40% max




YOUR CLIMATIC / WEATHER CONDITIONS



Height above Sea level

Elevation or height
above sea level has a significant impact on air density and thus wind turbine
power output.






meters


ft



Standard Atmosphere Barometric Pressure

Air density adjusted
for height above sea level & temperature.
Referenced from the Standard Atmosphere.



Pa


hPa


inHg



Local Temperature

Temperature has a
significant impact on air density and thus wind turbine power output.




°C


°F




Local Humidity

Relative humidity
has an effect on air density at temperatures above 30°C.




%






Calculated  Air Density based on International Standard
Atmosphere

Air density adjusted
for height above sea level & temperature.
Referenced from the Standard Atmosphere.



kg/m^{3}


lb/ft^{3}






Cumulative Power
Output at each Wind Speed


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Wind Speed (meters
per second) (m/s)

Wind Speed (meters per second) (m/s)



Individual
Wind Speeds

Probability of
Occurrence of a Particular Wind Speed

Turbine 1
Inst. Power (Max Theoretical based on geometry)

Turbine 2
Inst. Power (Max Theoretical based on geometry)

Turbine 1 Yearly
Power Output (Max Theoretical based on geometry)

Turbine 2
Yearly Power Output (Max Theoretical based on geometry)

Turbine 1
Inst. Power (based on CLAIMED data)

Turbine 2
Inst. Power (based on CLAIMED data)

Turbine 1
Yearly Power Output (based on CLAIMED
data)

Turbine 2 Yearly
Power Output (based on CLAIMED data)

Turbine 1 Power
Output

Turbine 2 Power
Output


Frequency of Occurrence of a
Particular Wind Speed

Frequency of
Occurrence of a Particular Wind Speed

Turbine 1
Limited Wind Speeds

Turbine 2
Limited Wind Speeds






























































































































































































































































































































































































































































































































































SUM =
















AVERAGE =



















RESOURCES to
assist in Wind turbine comparison and sizing:





Affordable &
accurate Wind Speed Data:

http://barani.biz/


Wind Powering
America US Department of Energy  National average wind speed maps:

http://www.windpoweringamerica.gov/wind_maps.asp



Elliptic Anemometer
& Data Logger:

http://barani.biz/meteoproducts/meteowind/















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2011 Barani Design
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