Efficiency improvement for solar cells panels by cooling

The high temperatures make the efficiency of the solar panels decreases and lead to a decrease in production power. In this study the cell surface temperature was reduced to low rates to improve efficiency and increase power by cooling the surface of the solar panel with water through adding a tube to the surface of the panel and make holes in diameters of 2 mm and at different flow rates (3 L /h, 6 L /h and 9 L /h) then compare it with solar panel without cooling. observed that the efficiency for all panel is peak at (12:30 pm) also observed that the efficiency increases with cooling by water and the results show the efficiency is being high when low flow rate, the all results for solar panel without cooling, 3 liters/hour, 6liter/hour and 9 liters/hour respectively for efficiency average per day through the experiment is (12.63%), (13.54%),(13.23 %) and (13.06
^%
), the rate of increase for efficiency in solar panels with comparison without cooling the results showed the efficiency increased of rate (6.71%) for flow rate 3 liters/hour, (4.51%) for 6 liters/hour flow and (3.28%) at flow rate 9 liters/hour.