Modelos de correção da medida da irradiância difusa pelo método do disco de sombreamento
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Data
2020-05-29
Autores
Lenz, Lucas Carvalho [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O presente trabalho sugere modelos de correção para a irradiância solar difusa medida com o disco de sombreamento. A irradiância global foi medida por um piranômetro Eppley-PSP; a irradiância normal direta por um pireliômetro Eppley-NIP adaptado a um dispositivo de rastreamento solar ST-3 e irradiância difusa por um piranômetro Eppley-PSP instalado em um disco de sombreamento. O Laboratório de Radiometria Solar da Universidade Estadual Paulista forneceu as medições durante os anos de 1997 a 2000. Os resultados mostraram que ambos os modelos sugeridos, o modelo para todas as coberturas de céu e o modelo para as diferentes coberturas de céu melhoram a medida da irradiância difusa pelo método do disco de sombreamento permitindo a geração de um banco de dados de radiação global, direta e difusa, sem altos investimentos financeiros. A medida da Irradiância difusa sem correção apresentou um MBE de -4,64% e um RMSE de 12,23%, enquanto que os modelos de correção para todas as coberturas de céu e para as diferentes coberturas de céu obtiveram MBE de 0,48% e 0,85 e RMSE de 10,52% e 9,91%, respectivamente.
The present work suggests correction models for diffuse solar irradiance measured with the shading disc. The global irradiance was measured by an Eppley-PSP pyranometer; normal direct irradiance by an Eppley-NIP pyreliometer adapted to an ST-3 solar tracking device and diffuse irradiance by an Eppley-PSP pyranometer installed in a shading disc. The Laboratory of Solar Radiometry at the State University of São Paulo provided the measurements during the years 1997 to 2000. The results showed that both models suggested, the model for all sky covers and the model for different sky covers improve the measurement of diffuse irradiance by the shading disc method allowing the generation of a database of global radiation, direct and diffuse, without high financial investments. The measurement of diffuse irradiance without correction showed an MBE of -4.64% and an RMSE of 12.23%, while the correction models for all sky coverings and for the different sky coverings obtained an MBE of 0.48 % and 0.85 and RMSE of 10.52% and 9.91%, respectively.
The present work suggests correction models for diffuse solar irradiance measured with the shading disc. The global irradiance was measured by an Eppley-PSP pyranometer; normal direct irradiance by an Eppley-NIP pyreliometer adapted to an ST-3 solar tracking device and diffuse irradiance by an Eppley-PSP pyranometer installed in a shading disc. The Laboratory of Solar Radiometry at the State University of São Paulo provided the measurements during the years 1997 to 2000. The results showed that both models suggested, the model for all sky covers and the model for different sky covers improve the measurement of diffuse irradiance by the shading disc method allowing the generation of a database of global radiation, direct and diffuse, without high financial investments. The measurement of diffuse irradiance without correction showed an MBE of -4.64% and an RMSE of 12.23%, while the correction models for all sky coverings and for the different sky coverings obtained an MBE of 0.48 % and 0.85 and RMSE of 10.52% and 9.91%, respectively.
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Palavras-chave
Radiometria, Radiação difusa, Cobertura de céu, Radiometry, Diffuse radiation, Sky cover