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Effect of dust on the transparent cover of solar collectors

机译：灰尘对集热器透明盖的影响

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Research and development in photovoltaic (PV) systems has usually been concentrated in studies on radiation availability, efficient operating strategies, design and sizing of these systems. On the other hand, the influence of dust on the performance of PV systems has not been given much attention. The work described here contributes considerably to overcome this deficit. To validate that concept, we have developed an experimental set up involving 100 glass samples with different tilt (β) and azimuth angles (γ). The transmittance of the glass was evaluated at regular intervals over a period of about seven months and after every thunderstorm in the surrounding area. Although it is only a short term view, the preliminary results indicate that the reduction in glass normal transmittance depends strongly on the dust deposition density in conjunction with plate tilt angle, as well as on the orientation of the surface with respect to the dominant wind direction. With this consideration, one sees that as the dust deposition density goes from 15.84 g/m~2 (for glass sample installed at a tilt angle of 0°) to 4.48 g/m~2 (for glass sample installed at a tilt angle of 90° and oriented with 135° deviation from north), the corresponding transmittance diminishes by approximately 52.54-12.38%, respectively. The evolutions of the output power variation with increasing cell pollution were also examined. It has been found that the slope of the best straight line passing through the data points of the solar cell installed at a 45° angle facing south suggests a decrease in the output power of about 17.4% per month.
机译：光伏（PV）系统的研究和开发通常集中在以下方面的研究：辐射可用性，有效的操作策略，这些系统的设计和尺寸。另一方面，粉尘对光伏系统性能的影响尚未引起足够的重视。这里描述的工作为克服这一缺陷做出了巨大贡献。为了验证该概念，我们开发了一个实验装置，涉及100个具有不同倾斜度（β）和方位角（γ）的玻璃样品。在大约七个月的时间里，以及周围地区每次雷暴之后，都要定期评估玻璃的透射率。尽管只是短期视图，但初步结果表明，玻璃法向透射率的降低在很大程度上取决于灰尘沉积密度，平板倾斜角以及表面相对于主导风向的定向。 。考虑到这一点，人们看到随着灰尘沉积密度从15.84 g / m〜2（对于以0°倾斜角安装的玻璃样品）变为4.48 g / m〜2（对于以0°倾斜角度安装的玻璃样品） 90°且与北偏135°定向），相应的透射率分别减小了约52.54-12.38％。还研究了输出功率随细胞污染增加而变化的变化。已经发现，最好的直线的斜率穿过以朝南成45度角安装的太阳能电池的数据点，这表明每月输出功率下降约17.4％。

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