Impact of soiling on Si and CdTe PV modules: Case study in different Brazil climate zones

Costa, Suellen Silva; Kazmerski, Lawrence L.; Diniz, Antônia A. C.

doi:10.1016/j.ecmx.2021.100084

Title: Impact of soiling on Si and CdTe PV modules: Case study in different Brazil climate zones

Journal Article · Sun May 23 00:00:00 EDT 2021 · Energy Conversion and Management. X

DOI:https://doi.org/10.1016/j.ecmx.2021.100084· OSTI ID:1798287

Costa, Suellen Silva ^[1]; Kazmerski, Lawrence L. ^[2]; Diniz, Antônia A. C. ^[1]

Pontifical Catholic University of Minas Gerais (Brazil)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States); Renewable and Sustainable Energy Institute (RASEI), Boulder, CO (United States)

Soiling, particulate accumulation on photovoltaic (PV) module surfaces, reduces the available solar resource and the resulting generated device power. This case-study summarizes initial results of 5-year research on the contrasting soiling conditions in the tropical, subtropical, and semi-arid climates in Brazil. A major objective is to present a case study of the effects of soiling on PV module performance in different Brazil climate zones that represent the primary areas for the current and expanding Brazil solar installations. For this, the paper presents methodologies to quantify the soiling ratio (SRatio) and soiling rate (SRate) for two representative commercial technologies, polycrystalline or multicrystalline silicon (mc-Si) and thin-film cadmium telluride (CdTe) modules, through soiling monitoring stations deployed in the selected climate regions. An aim is to add to the growing soiling-research knowledge base through addressing these key factors and their relationships to critical electrical, solar resource, thermal, and local meteorological and environmental parameters. This paper presents, evaluates, and compares soiling rates and losses in Belo Horizonte, Minas Gerais (Equatorial Tropical: 19.92° S, 43.99° W), Porto Alegre, Rio Grande do Sul (Humid-Subtropical: 30.05° S, 51.17° W), and Brotas de Macaúbas, Bahia (Semi-Arid: 12.00° S, 42.63° W). The results show that soiling is moderate in all 3-regions, for example with 0.1%/day < SRate < 0.2%/day for Belo Horizonte. Precipitation dominates the cleaning of the modules in the summertime in this climate zone, while it is the major factor year-round in Rio Grande do Sul. Wind is the major issue mitigating the soiling accumulation for the Bahia installation. The methodology incorporates several key refinements, including the normalization and adjustment for the meteorological parameters (temperature, irradiance, wind, precipitation). The evaluations include the region-specific differing effects of non-uniform soiling, natural cleaning, and ambient temperatures.

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Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); Coordenaç˜ao de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Renewable and Sustainable Energy Institute (RASEI)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1798287

Report Number(s):: NREL/JA-5K00-80330; MainId:42533; UUID:c9dd255a-f4ff-481a-b42c-8d74077ec2fb; MainAdminID:25643

Journal Information:: Energy Conversion and Management. X, Vol. 10; ISSN 2590-1745

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Impact of soiling on Si and CdTe PV modules: Case study in different Brazil climate zones

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