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• W2000302562 abstract "AVALIACAO DE MODELOS DE ESTIMATIVA DA RADIACAO DIFUSA NA OBTENCAO DA RADIACAO GLOBAL HORARIA EM SUPERFICIES INCLINADAS A radiacao solar incidente em planos inclinados e composta por tres componentes: direta, difusa e refletida do solo. A radiacao refletida apresenta um efeito pequeno e a radiacao direta pode ser obtida por modelos isotropicos. Em geral, as maiores limitacoes dependem da radiacao difusa por variacoes nas subcomponentes circunsolar, brilho horizontal, isotropicos e anisotropicos. Este trabalho avaliou a influencia do modelo de estimativa da radiacao difusa na obtencao da radiacao global incidente em superficies inclinadas a 12.85o, 22,85o e 32,85° para o Norte, na particao horaria, sob diferentes condicoes de nebulosidade, em Botucatu, SP (22° 53' S, 48° 26' W e 786 m de altitude). Foram avaliados os seguintes modelos: Circunsolar [CIR], Badescu [Ba], Hay [Ha] e Ma e Iqbal [MI], indicados como os melhores modelos para estimativa da radiacao difusa nas condicoes geograficas e climaticas locais. O aumento da inclinacao proporcionou maiores dispersoes entre valores medidos e estimados da radiacao global. As maiores variacoes nos residuos estatisticos foram encontrados para coeficientes de transmissividade atmosferica inferiores a 0,15 e em condicoes de ceu nublado ocorreram melhores estimativa em funcao dos baixos niveis energeticos. Palavras-chave: transmissividade atmosferica, indicativos estatisticos, modelos parametrizados. ABSTRACT The total solar irradiation incident on a tilted surface consists in three components including: direct, diffuse and reflected from the ground. The reflected radiation has a small effect and the direct radiation can be calculated with an isotropic model. The most difficulty depends on diffuse radiation by circumsolar variations, horizontal brightness, isotropic and anisotropic subcomponents. This study evaluated the influence of diffuse radiation estimate by different models for obtaining the incident global radiation on tilted surfaces at 12.85, 22.85and 32.85° facing to North, in hourly temporal partition, under different cloudiness sky conditions, in Botucatu, Sao Paulo State, Brazil (22°53′ S, 48°26′ W and 786 m above sea level). The following models were: Circumsolar [CIR], Badescu [Ba], Hay [Ha] and Ma and Iqbal [MI], that are indicated as the best models for estimating the diffuse radiation in the geographic and climatic local conditions. The increase of the inclination angle provides increased scattering between measured and estimated. The largest variations in the statistical residues were found for atmospheric transmissivity coefficients less than 0.15 and the best estimates occurred of cloudy skies due the low energy levels. Keywords: atmospheric transmissivity, statistical index, parameterized models. DOI: http://dx.doi.org/10.14583/2318-7670.v02n01a05" @default.
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• W2000302562 date "2014-03-19" @default.
• W2000302562 modified "2023-10-16" @default.
• W2000302562 title "An Assessment of the Diffuse Radiation Models for Prediction on Hourly Global Radiation in Tilted Surface" @default.
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• W2000302562 doi "https://doi.org/10.14583/2318-7670.v02n01a05" @default.
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