![]() ![]() (2000) found that stationary, flat reflectors mounted at the front of nonofficial PV modules had increased the annual output of the module by an order of 20-25%. (2000) showed that solar tracked PV array system, single-axis or two-axis solar tracking mechanisms are used where PV panel is mounted on the device to track the sun. During the last decades, the worldwide research in the field of solar energy has focused on the methods to efficiency enhancement and maximization of performance. INTRODUCTION hotovoltaic (PV) panel is one of the most important renewable energy technologies for converting sunlight into electric energy. The performance of the panel improved by the application of the reflector. ![]() Eng., April 2017-582-collected radiation is higher than the benefit ratio of output electric power for all operations in summer and winter. Eng., 34 (2): 581-598 FARM MACHINERY AND POWER Misr J. The gain in collected radiation and output electric power due to sun tracking was higher than the gain in collected radiation and output electric power due to change the tilt angle. The values of daily collected radiation, maximum output power and panel efficiency were 683.22W/m 2, 98.18W and 9.69% in summer and 518.85W/m 2, 87.73W and 11.669 % in winter, respectively. The best performance of panel was achieved when panel was sun tracking from east to west at panel tilt angle of 20⁰ in summer and 50⁰ in winter. By increasing solar radiation from 200 to 911.39W/m 2 tended to increase both of maximum output power PV and panel efficiency by 77.18 and 7.91%, respectively at PV temperature of 30⁰C. The results illustrated that, by increasing panel temperature tended to decrease both of maximum output power PV and panel efficiency at constant of solar radiation. The treatments were panel temperature in (summer and winter), daily solar radiation, panel tilt angles: (0⁰-20⁰-30⁰ in summer) and (0⁰-30⁰-50⁰ in winter), panel orientation: (toward south along daytime-sun tracking from east to west) and using mirror as reflector of sun rays. Therefore, the main objectives of the present study were: to design sun tracking system of the photovoltaic modules horizontally and vertically with reflector under different operation conditions. Sun tracking and reflector System was designed in Agricultural Engineering Dept., Faculty of Agric., Kafrelsheikh University and performed in summer and winter 2010/2011 at Rice Mechanization Center (RMC), Meet El-Deyba, Kafr El-Sheikh Governorate Egypt. Egypt has a high potential of solar energy, which can be considered as a reliable energy source during most of year because it lies within the subtropical regain. ![]()
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