Analysis of the influencing factors of the dust on the surface of photovoltaic panels and its weakening law to solar radiation d A case study of Tianjin

With the intensification of energy crisis and environmental pollution, solar photovoltaic technology has been paid more and more attention by many countries. However, dust on the surface of the photovoltaic panels is one of the main factors affecting solar photovoltaic (PV). In this paper, multiple factors (pre-cipitation, wind speed, wind direction and inclination angle) were considered to analyze the effect of dust on the PV panels by weighing and transmittance determination in Tianjin, China. A test platform with 4 typical orientation and 7 inclination was built to measure the transmission of PV panels in the outdoor. The results showed that the southward PV panels were affected by wind velocity and direction more than others. Dust on southward PV panels increased rapidly at first, and then decreased under the influence of rainfall. Without rainfall, the dust on southward PV panels placed in 45 degrees for 30 days was 1.90% lower than that in the eastward, and 7.32% and 11.95% higher than those in the westward and northward, respectively. The functional relationship between dust density and dip angle was established by regression analysis, and the best cleaning time of PV panels is once a month except in rainy season. (c) 2022 Elsevier Ltd. All rights reserved.