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Solar Forecasts Based on the Clear Sky Index or the Clearness Index: Which Is Better?
Solar, 2022 In the realm of solar forecasting, it is common to use a clear sky model output to deseasonalise the solar irradiance time series needed to build the forecasting models.
Philippe Lauret +3 more
doaj +4 more sources
Instantaneous global horizontal irradiance and clearness index data with high temporal resolution for 1016 days [PDF]
Data in Brief, 2022 Global Horizontal Irradiance was measured using a thermopile-type pyranometer during more than three years using a sample time of two seconds, with the purpose of capturing fast transient events of irradiance which are notable in tropical regions as the ...
Alberto Avila, Rafael Diez
doaj +2 more sources
Effect of sky clearness index on transmission of evacuated (vacuum) glazing [PDF]
Renewable Energy, 2017 Glazing transmittance variation with clearness index has higher influence than incident angle for soar energy application. This work presents variation of vacuum glazing transmittance with clearness index. Clearness index and transmittance was calculated from measured one year (2014) solar radiation and glazing transmittance data in Dublin, Ireland ...
Brian Norton, Aritra Ghosh
exaly +5 more sources
ON THE RELATIONSHIP OF BEAM TRANSMITTANCE ON CLEARNESS INDEX FOR ATHENS, GREECE
International Journal of Solar Energy, 1989 Proper design and performance prediction of solar energy systems requires accurate information on the availability of solar radiation. However, the complexity and cost of a reliable radiation measuring network dictates the need for developing alternatives that can replace and/or complement observations.
George Kallos, Costas Balaras
exaly +3 more sources
Atmosphere, 2016 The spatio-temporal characteristics of the clearness index (KT) were investigated using daily global solar irradiance measurements (290–2800 nm) for the period of 2000–2014 at 21 sites in Korea, a complex region in East Asia with a distinct monsoon ...
Yeonjin Jung +5 more
doaj +3 more sources
Wavelet power spectrum analysis applied for solar radiation investigations over Nigeria [PDF]
Songklanakarin Journal of Science and Technology (SJST), 2021 Wavelet power spectrum (WPS) techniques were used to evaluate the temporal structure of the clearness index and relative sunshine duration, using monthly values of clearness index and relative sunshine duration between 1995 and 2010.
Falayi E. O. +2 more
doaj +1 more source
Вісник Харківського національного університету імені В.Н. Каразіна. Серія Геологія. Географія. Екологія, 2021 Introduction. This paper deals with the specific aspects of insolation of the terrestrial surface in the southern regions of Ukraine, namely the clearness index and diffuse fraction of the atmosphere.
Vasyl Zatula +3 more
doaj +1 more source
Cleaner Engineering and Technology, 2021 In the present work, twelve machine learning (ML) models are developed for assessment of monthly average diffuse solar radiation (DSR) with solitary input forecaster as clearness index. Two categories of ML models were demarcated (i.e.
Shahid Husain, Uzair Ali Khan
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Evaluation of diffuse fraction and diffusion coefficient using statistical analysis
Applied Water Science, 2020 In this study, eighty models are proposed in order to estimate the diffuse fraction and diffuse coefficient. For the proposed models, sunshine ratio and clearness index are considered as predictors.
Hicham Salhi +2 more
doaj +1 more source
Energies, 2021 Solar energy is an economic and clean power source subject to natural variability, while energy storage might attenuate it, ultimately, effective and operationally feasible forecasting techniques for energy management are needed for better grid ...
Armando Castillejo-Cuberos +2 more
doaj +1 more source