pvlib.irradiance.louche#
- pvlib.irradiance.louche(ghi, solar_zenith, datetime_or_doy, max_zenith=90)[source]#
Determine DNI and DHI from GHI using the Louche model.
- Parameters
ghi (numeric) – Global horizontal irradiance. [W/m^2]
solar_zenith (numeric) – True (not refraction-corrected) zenith angles in decimal degrees. Angles must be >=0 and <=90.
datetime_or_doy (numeric, pandas.DatetimeIndex) – Day of year or array of days of year e.g. pd.DatetimeIndex.dayofyear, or pd.DatetimeIndex.
- Returns
data (OrderedDict or DataFrame) –
Contains the following keys/columns:
dni
: the modeled direct normal irradiance in W/m^2.dhi
: the modeled diffuse horizontal irradiance in W/m^2.kt
: Ratio of global to extraterrestrial irradiance on a horizontal plane.
References
- 1
Louche A, Notton G, Poggi P, Simonnot G. Correlations for direct normal and global horizontal irradiation on a French Mediterranean site. Solar Energy 1991;46:261-6. DOI: 10.1016/0038-092X(91)90072-5