Solar Radiation Models for the City of Tirana, Albania

Year 2014, Volume: 4 Issue: 2, 413 - 420, 01.06.2014

Altin Maraj Andonaq Londo Coskun Firat Rexhep Karapici

Abstract

Mathematical models for evaluating the solar radiation potential are not available for every country or specific sites. In this paper, different solar radiation models (linear, exponential, power) for the city of Tirana-Albania, are built and tested. These models are used to estimate the monthly average total solar radiation on horizontal surface, based on measured data. Measured data include solar radiation on horizontal surface and sunshine duration data, which are used for the development of the models. Calculated and measured values are compared and evaluated by using statistical test methods. Calculated values obtained from the proposed solar radiation models show a good agreement with the measurements. In the best solar radiation model, the percentage error is emax=3.452%, MBE=-0.001465kWh/(m2·day), MPE=-0.015%, RMSE=0.074kWh/(m2·day), and R2=0.998. 

Keywords

(total solar radiation; horizontal surface; sunshine duration; statistical test values; solar radiation models).

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