pvlib.irradiance.king

pvlib.irradiance.king(surface_tilt, dhi, ghi, solar_zenith)

Determine diffuse irradiance from the sky on a tilted surface using the King model.

King’s model determines the diffuse irradiance from the sky (ground reflected irradiance is not included in this algorithm) on a tilted surface using the surface tilt angle, diffuse horizontal irradiance, global horizontal irradiance, and sun zenith angle. Note that this model is not well documented and has not been published in any fashion (as of January 2012).

Parameters:

surface_tilt : float or Series

Surface tilt angles in decimal degrees. The tilt angle is defined as degrees from horizontal (e.g. surface facing up = 0, surface facing horizon = 90)

dhi : float or Series

Diffuse horizontal irradiance in W/m^2.

ghi : float or Series

Global horizontal irradiance in W/m^2.

solar_zenith : float or Series

Apparent (refraction-corrected) zenith angles in decimal degrees.

Returns:

poa_sky_diffuse : float or Series

The diffuse component of the solar radiation on an arbitrarily tilted surface as given by a model developed by David L. King at Sandia National Laboratories.