Keywords : Dust deposition effect
journal of kerbala university,
Volume 7, Issue 4, Pages 116-122
Deposition of airborne dust on outdoor photovoltaic (PV) modules may decrease the transmittance of solar cell glazing and cause a significant degradation of generated power from solar panel by certain percentage, according to the impact of the amount of dust and the factors associated with it and which form a strong relationship are interrelated with each one (the proportion of the accumulation of dust , inclination angles, exposure time, the climatic conditions of the site, wind speed, and dustproperties). In this practical field study, an experimental-based investigation is conducted in order to compare the energy performance of four identical PV-panels with 20 watt power; one cleaned daily, one cleaned weekly, one cleaned monthlyand one subjected to the influence of the accumulation of dust, by using Solmetric PV Analyzer for a period of time (30/10/2012 to 30/04/2013). and then calculating relative conversion efficiency (E) to three panels. According to the practical results obtained appeared that there is a significant decrease in the relative conversion efficiency which was ( 7.9%, 20%, 27%) for the weekly cleaned, monthly cleaned andseasonally cleaned panels respectively relative to daily cleaned panel and the reduction in average performance factor was ( 5.7 , 12.6 ,17.2 ) for weekly cleaned, monthly cleaned and seasonally cleaned panels respectively.