windpowerlib.modelchain.Modelchain.rho_hub

Modelchain.rho_hub(weather, data_height)[source]

Calculates the density of air at hub height.

The density is calculated using the method specified by the parameter rho_model. Previous to the calculation of density the temperature at hub height is calculated using the method specified by the parameter temperature_model.

Parameters:
  • weather (DataFrame or Dictionary) – Containing columns or keys with timeseries for temperature temp_air in K and pressure pressure in Pa, as well as optionally the temperature temp_air_2 in K at a different height for interpolation.
  • data_height (DataFrame or Dictionary) – Containing columns or keys with the heights in m for which the corresponding parameters in weather apply.
Returns:

rho_hub – Density of air in kg/m³ at hub height.

Return type:

pandas.Series or array