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Greenbyte Documentation

Density Adjusted Wind Speed

The power produced by the wind turbines is affected by the wind speed and the air density. However, density measurement might not always be available and hence, this calculation provides density-adjusted wind speed by estimating the density of the air using ambient temperature, elevation, and hub height.

Technology

Wind

Remarks

Required metadata:

  • Elevation of the turbine (directly entered into the Turbine table during site onboarding). If this is not available when onboarding new sites, please contact the Research team for help.

  • Hub-height (GlobalMetadataFieldId: 2) is needed but if not available the backend will default to 100 m.

Note

This signal is behind the DensityAdjustedWindSpeed feature gate.

Equation
Density_Adjusted_Wind_Speed_-_Equation_1.png

Where:

Wadj

is the density adjusted wind speed

Ph

is the estimated density based on elevation and ambient temperature

P0

is the air density at sea level and ISA

Density_Adjusted_Wind_Speed_-_Equation_1_1.png

The density at elevation h is estimated as:

Density_Adjusted_Wind_Speed_-_Equation_2.png

Where:

Pturbine

is the air pressure at the turbine hub

Pturbine is defined as:

Density_Adjusted_Wind_Speed_-_Equation_3.png

Where:

Th

is the ambient temperature measured at hub height in Kelvin

Density_Adjusted_Wind_Speed_-_Equation_3_1.png

is the lapse rate

h

is the hub height from sea level

Density_Adjusted_Wind_Speed_-_Equation_3_2.png

is the gravitational constant

Density_Adjusted_Wind_Speed_-_Equation_3_3.png

is the molar mass of dry air

Density_Adjusted_Wind_Speed_-_Equation_3_4.png

is the universal gas constant and

Density_Adjusted_Wind_Speed_-_Equation_3_5.png

.

Inputs
Density_Adjusted_Wind_Speed_-_Inputs.png
Usage Example
Density_Adjusted_Wind_Speed_-_Usage_Example.png