Abstract
The design of a solar energy system in a region where the solar potential is restricted to the measurement of the global horizontal solar radiation and the diffuse component is not supported requires using models for this estimation with radiometric parameters such as sunshine duration, clearness index, temperature, and relative humidity. The present study deals with a qualitative and quantitative study that was established on the diffuse component of horizontal global radiation, which has been applied for the Oran site, a coastal region located in northwestern Algeria. The results obtained from this analysis permitted to find mathematical correlations between the diffuse and the clearness index for different levels of solar altitude and for different seasons. A comparative study was carried out; first, to see the impact of the season on the accuracy of the models established by using statistical indicators namely mean bias error, root-mean-squared error, and the t -stat. Secondly, another comparative study was carried out using other works previously published in the scientific literature. The introduction of the solar altitude as a predictor for establishing correlations of the diffuse component has significantly reduced the standard error compared to other models, which considered the clearness index as the only independent variable.
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