pvlib.irradiance.liujordan

pvlib.irradiance.liujordan(zenith, transmittance, airmass, pressure=101325.0, dni_extra=1367.0)[source]

Determine DNI, DHI, GHI from extraterrestrial flux, transmittance, and optical air mass number.

Liu and Jordan, 1960, developed a simplified direct radiation model. DHI is from an empirical equation for diffuse radiation from Liu and Jordan, 1960.

Parameters:

zenith: pd.Series

True (not refraction-corrected) zenith angles in decimal degrees. If Z is a vector it must be of the same size as all other vector inputs. Z must be >=0 and <=180.

transmittance: float

Atmospheric transmittance between 0 and 1.

pressure: float

Air pressure

dni_extra: float

Direct irradiance incident at the top of the atmosphere.

Returns:

irradiance: DataFrame

Modeled direct normal irradiance, direct horizontal irradiance, and global horizontal irradiance in W/m^2

References

[1] Campbell, G. S., J. M. Norman (1998) An Introduction to Environmental Biophysics. 2nd Ed. New York: Springer.

[2] Liu, B. Y., R. C. Jordan, (1960). “The interrelationship and characteristic distribution of direct, diffuse, and total solar radiation”. Solar Energy 4:1-19