الفهرس 
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Abstract
Photovoltaic solar energy (PV) is considered as one of the most promising
environmentally friendly renewable energy sources. Performance of PV systems is
affected by many environmental factors such as solar irradiation, humidity, ambient
temperature, wind speed, and dust accumulation. Dust accumulation is one of the
natural phenomena that leads to a significant decrease in the efficiency of the
photovoltaic solar system, in the sense that it reduces the transmittance of the solar
cell glazing. Rate of dust accumulation depends upon the dust properties (chemical
properties, size, shape,…etc.) as well as on the site climatic conditions such as
humidity and wind speed. Moreover, the surface finish, and the tilt angle also affect
the rate of dust accumulation.
In this thesis, the work presents the results of a study carried out at Fayoum
University with a detail experimental procedure that divided into three aspects: (1)
designing a systematic experiment to accurately characterize the influence of dust
pollutant type on the performance of monocrystalline and polycrystalline PV cells
(indoor experiment), reviewing and comparing improved models for particle.