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Evaluation of enhancement events of global horizontal irradiance due to clouds at Patras, South-West Greece

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  • Vamvakas, Ioannis
  • Salamalikis, Vasileios
  • Kazantzidis, Andreas

Abstract

Cloudiness is the dominant factor that affects the transfer of solar irradiance through the atmosphere. Especially the type of clouds, their high spatial and temporal variability, velocity and position relatively to the Sun, could cause events ranging from total reduction to substantial enhancements of surface solar irradiance. In study, the enhancements of Global Horizontal Irradiance (GHI) at South Greece for 2 years are examined. We use 1–min averages of GHI, sunshine duration and synchronized estimations of cloud coverage and type from a digital imaging system. A radiative transfer model is used to estimate GHI under clear skies. For solar zenith angles lower than 80°, 4% of total GHI measurements are considered as enhancements. It is shown that the effect of thick clouds on the GHI enhancements is significantly higher when compared to the thin ones. We also examine cases that correspond to instantaneous clearness index values higher than 1 (Kt > 1): 228 extreme enhancement events are found including 5 cases with GHI values higher than 1367 W/m2 and a maximum value of 1420 W/m2. These results suggest that such events are common and should be included in the design and simulation of the performance of solar energy systems.

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  • Vamvakas, Ioannis & Salamalikis, Vasileios & Kazantzidis, Andreas, 2020. "Evaluation of enhancement events of global horizontal irradiance due to clouds at Patras, South-West Greece," Renewable Energy, Elsevier, vol. 151(C), pages 764-771.
    • Handle: RePEc:eee:renene:v:151:y:2020:i:c:p:764-771
    DOI: 10.1016/j.renene.2019.11.069
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    References listed on IDEAS

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    5. Tzoumanikas, P. & Nikitidou, E. & Bais, A.F. & Kazantzidis, A., 2016. "The effect of clouds on surface solar irradiance, based on data from an all-sky imaging system," Renewable Energy, Elsevier, vol. 95(C), pages 314-322.
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