Extraterrestrial Irradiance

This function computes the extraterrestrial irradiance outside of the earth’s atmosphere, based a Fourier series representation of the position of the sun (earth-sun distance).

Inputs

Extraterrestrial Irradiance Inputs

Outputs

Extraterrestrial Irradiance Outputs

Algorithm

Extraterrestrial Irradiance Algo 28

Extraterrestrial Irradiance Algo 29

Reference

Bird, R., Hulstrom, R., A Simplified Clear Sky Model for Direct and Diffuse Insolation on Horizontal Surfaces, 1981
NREL SERI/TP-642-761

Spencer, J. W., Fourier Series Representation of the Position of the Sun, Vol. 2, 1971, p. 172.