PHYSICAL-CHEMICAL EVALUATION OF THE SOILING DEPOSITED ABOUT PHOTOVOLTAIC MODULES INSTALLED IN THE ZONES CLIMATE IN PARANÁ, BRAZIL
DOI:
https://doi.org/10.59627/cbens.2022.1054Keywords:
Soiling, Photovoltaic Module, Physicochemical CompositionAbstract
The performance of photovoltaic systems is affected by real environmental conditions, such as solar irradiance, temperature and soiling, in this order of relevance. Soiling describes the deposition of dust and other contaminants on the surface of the photovoltaic module, which attenuate solar irradiance by absorbing or reflecting sunlight, causing yield losses and possibly contributing to the degradation of the photovoltaic module. This study aims to evaluate the physicochemical composition of soiling naturally deposited in photovoltaic modules installed in the cities of Medianeira, Pato Branco, Campo Mourão and Curitiba, in the state of Paraná. Morphological and elemental analysis of the collected dirt were performed using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). The morphology of the samples indicates that the dirt particles have different shapes and sizes (1 to 58 μm), which directly influence the adhesion of the surface of the photovoltaic module. Mechanisms of soiling that increase adhesion to the surface, such as cementation and agglomeration of particles due to interaction with water, have been observed. In elemental analysis, oxygen is the dominant element in the sample composition, followed by iron, silicon, aluminum, calcium, tin, magnesium, titanium, barium, potassium, sulfur, fluorine, copper, sodium, chlorine, phosphorus and manganese. Therefore, understanding the physicochemical characteristics of dirt is important to understand the source of adhesion and to seek appropriate cleaning methods, as well as in the development of self-cleaning coatings, can help identify its origin and indicate the movement of particles in an electric field, which may be associated with module degradation.
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