A critical look at recent interpretations of the Ångström approach and its future in global solar radiation prediction

Towards increasing availability of the Ångström–Prescott radiation parameters across China: Spatial trend and modeling

“…These include the model proposed by Rietveld [28] relating a and b to n=N, and the one proposed by Glover and McCullogh [21] relating a to latitude. The former is widely misinterpreted [17] and the latter is rated poorly [36][37][38]. To our knowledge, no one has ever used Z or P alone in the parameter model, but according to our results, they could be used with confidence.…”

“…The better performance of the A-P formula was also implied in Liu et al [14], Zhou et al [15] and Chen et al [16] using data from China. Although the empiricism of the A-P model is sometimes criticized [17] by modelers of the complex atmospheric transfer models, the simplicity, lower computational cost and easily accessible input data make it more attractive in applications and it is undoubtedly one of the most widely used models worldwide. Given to its better performance, both the FAO (Food and Agriculture Organization) papers 56 [18] and 24 [19] recommend it to estimate Rs in cases where it is lacking or of questionable quality.…”

Validation and Ranking Methodologies for Solar Radiation Models

“…Finally, the required time scale of the input data must be clearly identified to avoid misinterpretations. For instance, Gueymard et al (1995) showed that using a sunshine-based global radiation model with empirical coefficients originally developed for yearly-mean sunshine, but incorrectly applied to monthly means for convenience, could be detrimental.…”

“…An appropriate error analysis should be the first step into validating radiation models, but is rarely provided by their authors. A simple example follows, using the case of theÅngström-Prescott equation (Gueymard et al 1995;Martinez-Lozano et al 1984)-one of the simplest radiation models ever proposed:…”

Assessing the transferability of support vector machine model for estimation of global solar radiation from air temperature

“…Accurate estimation of solar radiation has been being a major goal for solar energy practitioners, climatologists and all concerned scientists [29]. It seems that H-S, B-C models and their revised http://dx.doi.org/10.1016/j.enconman.2014.…”