Physics of Semiconductors and Solar Energy Research Team (PSES), Energy Research Center, ENS, Mohammed V University in Rabat, Rabat, Morocco.
Environ Sci Pollut Res Int. 2022 Jul;29(32):48975-48985. doi: 10.1007/s11356-022-19171-5. Epub 2022 Feb 24.
Soiling has a crucial importance regarding its impact mainly for countries that have high soiling levels, dust storms, water scarcity and a great solar energy potential as the case of Morocco. Soiling mitigation is therefore mostly required during spring, due to higher pollen concentration, and summer, due to the lack of heavy precipitation. In this work, systematic measurements of soiling ratio were made in Rabat, city of north-western Morocco, during almost 1 year. Soiling has been evaluated considering the effect of dual-axis tracking that was compared to photovoltaic (PV) on fixed structure. A soiling rate of about 0.22%/day has been found for static PV while only 0.1% was found for PV on tracker. An additional approach of cleaning has been proposed in this paper which aims to use dew water. Using glass samples that were exposed to real environmental conditions, similar to the exposure conditions of PV panels, the soiling ratio was determined. At sunrise time, the subsequent change of the glass sample, from the horizontal position at night into the position of 30° tilt angle during the day, is performed to promote dew flow by the force of gravity acting on the droplets of dew. It has been found that relying only on the change of tilt angle, the average soiling losses were only 3.8% compared with 11.8% for fixed PV. This approach can reduce soiling similarly to solar trackers.
在摩洛哥这样的国家，污染具有重要的影响，尤其是在污染水平高、沙尘暴频发、水资源短缺和太阳能潜力巨大的情况下。因此，需要在春季（花粉浓度较高时）和夏季（降水稀少时）主要减少污染。在这项工作中，我们在摩洛哥西北部城市拉巴特进行了近一年的系统污染比测量。考虑到双轴跟踪的影响，我们对固定结构上的光伏（PV）进行了比较，并对污染进行了评估。我们发现，对于固定 PV，污染率约为 0.22%/天，而对于跟踪器上的 PV，污染率仅为 0.1%。本文提出了一种额外的清洁方法，旨在利用露水。我们使用暴露在真实环境条件下的玻璃样本，这些样本的暴露条件与 PV 板的暴露条件相似，以确定污染比。在日出时，玻璃样本从夜间的水平位置转变为白天的 30°倾斜位置，利用重力作用于露水的力来促进露水流动。结果发现，仅依靠倾斜角度的变化，与固定 PV 相比，平均污染损失仅为 3.8%，而固定 PV 为 11.8%。这种方法可以像太阳能跟踪器一样减少污染。
