Mustapha Koussa, Mourad Haddadi, Djohra S. Koussa, Ali Malek, and Seddik Hadji
Irradiation, sun tracking, diffuse irradiation, gain
The objectives of this work is to determinate the most appropriate sun tracking system. To this end, the effect of five configurations of sun tracking systems on the flat plate photovoltaic system performance for different sky states has been investigated. Data collected over 18 days for different seasonal sky conditions have been employed. The daily collected global solar radiation and produced electrical energy as well as the electrical gains related to the different moving panels have been quantified separately and compared to those experienced with two traditional fixed photovoltaic systems. It is found that for a completely clear day, the highest obtained gains are those related to the two-axis sun tracker system, which decrease gradually from the inclined to the vertical rotating axis when the same optimum slope is applied and from the seasonal to the yearly optimum slope if the same rotating axis is considered. Also, the day length is the main parameter affecting the obtained gain. For the partially clear days, the gain amounts are mainly dependent on the clearness index and also on the day length. For a completely cloudy day, the results show that the horizontal position of the photovoltaic panel presented the best performance.
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