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Title: Contribution to the diffuse radiation modelling in Évora, Portugal
Authors: Abreu, Edgar F.M.
Canhoto, Paulo
Costa, Maria João
Keywords: Solar energy
Solar radiation
Diffuse radiation
Clearness index
Fitting model
Issue Date: Dec-2016
Citation: Abreu, E.F.M., Canhoto, P., Costa, M.J., "Contribution to the diffuse radiation modelling in Évora, Portugal", Workshop on Earth Sciences, Évora, 2016.
Abstract: Solar radiation data is crucial for the design of energy systems based on the solar resource. Since diffuse radiation measurements are not always available in the archive data series, either due to the inexistence of measuring equipment, shading device misplacement or missing data, models to generate these data are needed. In this work, one year of hourly and daily horizontal solar global and diffuse irradiation measurements in Évora are used to establish a new relation between the diffuse radiation and the clearness index. The proposed model includes a fitting parameter, which was adjusted through a simple optimization procedure to minimize the Least Square Error as compared to measurements. A comparison against several other fitting models presented in the literature was also carried out using the Root Mean Square Error as statistical indicator, and it was found that the present model is more accurate than the previous fitting models for the diffuse radiation data in Évora.
Type: lecture
Appears in Collections:ICT - Comunicações - Em Congressos Científicos Nacionais

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