ADAPTIVE NUMERICAL MODEL FOR SOLAR RADIATION

Nowadays the solar power is one of the most appreciate renewable energies in the world. In order to maximise the solar radiation collection, many numerical models have been developed. There are three groups of factors that determines the interaction of solar radiation with the earths atmosphere and surface (see e.g. [1]): a. The Earths geometry, revolution and rotation (declination, latitude, solar hour angle); b. Terrain (elevation, albedo, surface inclination and orientation, shadows); c. Atmospheric attenuation (scattering, absorption) by: c.1. Gases (air molecules, ozone, CO2 and O2); c.2. Solid and liquid particles (aerosols, including non-condensed water); c.3. Clouds (condensed water). If we consider the three factors of atmospheric attenuation (c) in the model, it will produce real-sky (overcast) radiation values. If we omit the cloud attenuation (c.3), clear-sky (cloudless) radiation values will be obtained. The modelling of solar radiation has been carried out along the last three decades in order to optimis