Global solar irradiance in Cordoba: Clearness index distributions conditioned to the optical air mass

Varo, M.; Pedrós, G.; Martínez-Jiménez, Pilar; Ureña, María Jesús Aguilera

doi:10.1016/j.renene.2005.07.004

Cited by 8 publications

(3 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, these findings are not in accordance with results from Jurado et al (1995), Tovar et al (1998) and Varo et al (2006), who found an increased bimodality for higher air mass. The descriptions of those studies suggest that seasonal cloud variation was not taken into consideration.…”

Section: Solar Zenith Angle Dependencycontrasting

confidence: 99%

“…There are already a wide range of studies concerning the PDFs of total solar irradiance for photovoltaic applications (Suehrcke and McCormick 1988;Gansler et al 1995;Jurado et al 1995;Tovar et al 1998;Varo et al 2006). The studies generally agree that whereas bimodal densities are found for minute based data, this property gradually disappears as the irradiance is averaged over periods longer than 60 min.…”

Section: Introductionmentioning

confidence: 86%

See 1 more Smart Citation

Estimating probability distributions of solar irradiance

Voskrebenzev

Riechelmann

Bais

et al. 2014

Theor Appl Climatol

View full text Add to dashboard Cite

In the presence of clouds the ability to calculate instantaneous spectral irradiance values is limited by the ability to acquire appropriate input parameters for radiative transfer solvers. However, the knowledge of the statistical characteristics of spectral irradiance as a function of season and time of the day is relevant for solar energy and health applications. For this purpose a method to derive the wavelength dependent probability density functions (PDFs) and its seasonal site variability is presented. In contrast to the UVB range, the derived PDFs at three stations in Europe (Bilthoven, Garmisch-Partenkirchen and Thessaloniki) show only minor wavelength dependence above 315 nm. But there are major differences of the PDFs that are attributed to the site specific cloud climatology at these stations. Furthermore the results suggest that the previously described relationship between air mass and bimodality is the consequence of seasonal cloud variations. For A. Voskrebenzev ( ) · S. Riechelmann · G. Seckmeyer Thessaloniki it is shown that the pyranometer sample spread around the cloudless value is proportional to the secant of the solar zenith angle and therefore scales according to air mass. Cloud amount observations are utilized to associate the local maxima of the multimodal PDFs with rough cloudiness states confirming the already established interpretation of broadband data for spectral data as well. As one application example the likelihood of irradiance enhancements over the clear sky case due to clouds is assessed.

show abstract

Section: Solar Zenith Angle Dependencycontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 86%

Estimating probability distributions of solar irradiance

Voskrebenzev

Riechelmann

Bais

et al. 2014

Theor Appl Climatol

View full text Add to dashboard Cite

show abstract

“…Beta probability distribution function was utilised to model the clearness index, sunshine hour and the solar radiation using the data recorded at thirty-three meteorological stations in Algeria over a period of eleven years [9]. Further readings on probabilistic distribution of clearness index abound [10].…”

Section: Introductionmentioning

confidence: 99%