A comparative study to estimate daily diffuse solar radiation over India

Models for the estimation of diffuse solar radiation for typical cities in Turkey

“…K ¼ 0:9088 À 0:6109K T À 0:2888ðn=NÞ R ¼ 0:9994 (22) K ¼0:9256 À 0:5868K T À 0:0215K 2 T À 0:3822ðn=NÞ þ 0:0838ðn=NÞ 2 R ¼ 0:9997 (23) K ¼0:8130 À 0:2041K T À 0:8108K 2 T þ 0:5217K 3 T À 0:0491ðn=NÞ À 0:5646ðn=NÞ 2 À 0:3961ðn=NÞ 3 R ¼ 1:0000…”

The Importance of the Chosen Technique to Estimate Diffuse Solar Radiation by Means of Regression

“…While investigating these models, the variables under consideration are; clearness index (K T = H/H 0 ), relative sunshine duration or sunshine fraction (S/S 0 ), diffuse coefficient (K dd = H d /H 0 ); and diffuse fraction or cloudiness index (K d = H d /H) (Oliveira et al 2002;Aras, Balli, and Hepbasli 2006;Bakirci 2009;Koussa, Malek, and Haddani 2009;Pandey and Katiyar 2009;Ulgen and Hepbasli 2009;Ruis-Arias et al 2010;Torres et al 2010).…”

Solar Radiation: Models and Measurement Techniques

“…Therefore, an extensive work has to be done in this area [25,[39][40][41]. Recently some others researchers [13,14,[42][43][44][45][46][47][48][49][50][51] have also reported new developments in solar energy.…”

“…Decomposition models which are based on the correlations between the clearness index (it is the ratio of global to the extraterrestrial solar radiation) and the diffuse fraction (it is the ratio of diffuse to the global solar radiation), diffuse coefficient (it is the ratio of diffuse to the extraterrestrial solar radiation) or the direct transmittance (it is the ratio of beam to the extraterrestrial solar radiation) as an example Orgill and Hollands, Erbs et al, Reindle et al and Liu and Jordan models [9][10][11][12] developed to estimate direct and diffuse radiations from global radiation. Instead of these two methods nowadays empirically method [13][14][15] and the artificial neural network method (which constitutes a widely accepted novel approach offering an alternative way to synthesize complex problems) can also be used for the determination of global and diffuse components of solar radiation [16,17].…”

“…Recently, Mefti et al [57] gave the hourly solar radiation model for inclined surfaces using sunshine duration data. An extensive work has to done in this area [13,14,[58][59][60][61][62][63].…”