Abstract
The incoming solar radiation is an essential climate variable that determines the Earth’s energy cycle and climate. Its accurate assessment is also relevant for the correct sizing, design, and dynamic simulation of solar energy systems. The three main solar radiation components—global horizontal irradiance (GHI), direct normal irradiance (DNI) and diffuse horizontal irradiance (DHI) are usually not all available simultaneously as measured data. Thus, the missing components have to be obtained by means of the numerical modelling. The present article is dedicated on the evaluation of the simulation capabilities of the solar radiation model DISC using satellite data as an input and as a reference. The DNI and, subsequently, the sunshine duration are simulated using the surface irradiance from the CM SAF SARAH2 product collection as a main input parameter. The model set-up implements also information from the Bulgarian operative system ProData as an auxiliary data. Computations on hourly basis for the year 2015 over domain, which covers Bulgaria with fine-spaced grid, have been performed. The results have been compared with their satellite counterparts from the same collection. The main conclusion is that the modelled results remarkably overestimate the satellite-derived estimations.
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