STUDYING THE EFFECTS OF WATER MISTING COOLING SYSTEM ABOVE THE FRONT SURFACE FOR PV ON THE OUTPUT POWER& EFFICIENCY

Abstract

The photovoltaic cells will be ineffective forlong-time if the temperature increasemore a certain limit.Photovoltaic cells are the main part for photovoltaic water pumping systems. So as to use PV powerand increase photovoltaic system efficiency, it is very significant to save PV cell temperatureand cell reflection as low as possible.The purpose of this research project was to get data to study thespecial effects of cooling on the output power/efficiency of solar (photovoltaic) modulesusingacontinuous water misting system.The single test day consists of 6 test hours starting from 10:00 am to 3:00 pm. This present work used two solarmodules of 210W for each one and connected in parallel.The collected data was within one 18 day period in August, 2015. Measurements were taken for solar module’s surface temperature, output voltage, and output current, as wellas the ambient temperature, wind speed and solar radiation.The experimental tests show thatthe continuous mist cooling systems provided the highest solar module average power gain (i.e., increased efficiency between11.4% for two nozzle and 23% when using four nozzles) ranging between 12.25%when using two nozzles and 20.3%when using four nozzles.Therefore, when the cells power is increased by spraying water over the photovoltaic cells Thislead to increase the system and subsystem efficiency(voltage and current chargeable here in the present work ) when operatingunder different loads.