Document Type : Original Article
Authors
1
Prof. Emt. of Agric. Eng., Faculty of Agric. Eng., Al-Azhar Univ., Cairo, Egypt.
2
Prof. of Agric. Eng., Faculty of Agric. Eng., Al-Azhar Univ., Assiut, Egypt.
3
Lecturer, Water and Soil Res. center, NRC, AEA., Cairo, Egypt.
4
Demonstrator at Fac. of Agric. Eng., Al-Azhar Univ., Assiut, Egypt.
Abstract
There are many factors affect the performance and efficiency of photovoltaic system that need to study to avoid or reduce its negative impact when designing the photovoltaic system. The main objective of this study is to evaluate the performance of photovoltaic water pumping system under actual operating conditions by study the effect of intensity of solar radiation, dust accumulation on Pv panels, panels temperature, system components efficiencies, and the life cost comparison for Pv, and diesel water pumping systems. Experiments were carried out on photovoltaic water pumping station located in Bani Salamah- Al-Qanater-Giza Governorate-Egypt, which located at latitude 30.325364o N, longitude 30.805797oE, and 19 m above the sea level, from September 2016 to June 2017. The measurements were taken daily from sunrise to sunset every 15 minutes. The measurements include: solar radiation (tilted, direct, horizontal), panel`s temperature, solar generator output (DC current, DC voltage,), inverter output (AC current, AC voltage, frequency Hz), pump discharge, dynamic pressure. The study showed that; the pump flow rate was strongly affected by the intensity of solar radiation. where the hourly-average flow rate in December, March, and June was 18.2, 22.2, and 22.8 m3/h respectively. The degradation in panels efficiency, which decreased from 13.2% at dust density of 0 g / m2 to 0.8% at dust density 375 g / m². When the temperature increases by 1 co in summer and winter the efficiency decreases with 0.48% and 0.42% respectively. The total cost in the Pv, and diesel-powered systems was 9.22, and 37.2 LE/h, and the cost of producing 1 kilowatt of energy reaches 1.23, and 4.96 LE/kW.h respectively.
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