Diffuse irradiation

The global radiation on the horizontal GHI is divided into the direct and the diffuse components: BHI (beam horizontal irradiance) and DHI (diffuse horizontal irradiance). The following models are available for this division:

Reindl

With reduced correlation (in previous versions of PV*SOL® only this model was available)

Reindl, D.T.; Beckmann, W. A.; Duffie, J.A.: Diffuse fraction correlations; Solar Energy; Vol. 45; No. 1, S.1.7; Pergamon Press; 1990, http://dx.doi.org/10.1016/0038-092X(90)90060-P.

Orgill & Hollands

Orgill, J. F., & Hollands, K. G. T. (1977). Correlation equation for hourly diffuse radiation on a horizontal surface. Solar Energy, 19(4), 357–359. https://doi.org/10.1016/0038-092X(77)90006-8

Erbs, Klein & Duffie

Erbs, D. G., Klein, S. A., & Duffie, J. A. (1982). Estimation of the diffuse radiation fraction for hourly, daily and monthly-average global radiation. Solar Energy, 28(4), 293–302. https://doi.org/10.1016/0038-092X(82)90302-4

Boland, Ridley & Laurent

Ridley, B., Boland, J., & Lauret, P. (2010). Modelling of diffuse solar fraction with multiple predictors. Renewable Energy, 35(2), 478–483. https://doi.org/10.1016/j.renene.2009.07.0181

Boland, Ridley & Laurent (2010)

Ridley, B., Boland, J., & Lauret, P. (2010). Modelling of diffuse solar fraction with multiple predictors. Renewable Energy, 35(2), 478–483. https://doi.org/10.1016/j.renene.2009.07.018

Perez & Ineichen

Perez, R. R., Ineichen, P., Maxwell, E. L., Seals, R. D., & Zelenka, A. (1992). Dynamic global-to-direct irradiance conversion models. In ASHRAE Transactions (Vol. 98, pp. 354–369). https://doi.org/citeulike-article-id:10576695

Hofmann (Default model)

Hofmann, M., & Seckmeyer, G. (2017). A New Model for Estimating the Diffuse Fraction of Solar Irradiance for Photovoltaic System Simulations. Energies, 10(2), 248. https://doi.org/10.3390/en10020248

Skartveit

Skartveit, A., Olseth, J. A., & Tuft, M. E. (1998). An hourly diffuse fraction model with correction for variability and surface albedo. Solar Energy, 63(3), 173–183. https://doi.org/10.1016/S0038-092X(98)00067-X