pvlib.irradiance.liujordan¶
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pvlib.irradiance.
liujordan
(zenith, transmittance, airmass, 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, default 101325.0
Air pressure
- dni_extra: float, default 1367.0
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