An assessment of the diffuse radiation models for prediction on hourly global radiation in tilted surface

Detalhes bibliográficos
Autor(a) principal: Escobedo, João Francisco [UNESP]
Data de Publicação: 2014
Outros Autores: Souza, Adilson Pacheco de, Martins, Dinival [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.14583/2318-7670.v02n01a05
http://hdl.handle.net/11449/140762
Resumo: 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, São 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.
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spelling An assessment of the diffuse radiation models for prediction on hourly global radiation in tilted surfaceAvaliação de modelos de estimativa da radiação difusa na obtenção da radiação global horária em superfícies inclinadasAtmospheric transmissivityStatistical indexParameterized modelsTransmissividade atmosféricaIndicativos estatísticosModelos parametrizadosThe 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, São 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.A radiação solar incidente em planos inclinados é composta por três componentes: direta, difusa e refletida do solo. A radiação refletida apresenta um efeito pequeno e a radiação direta pode ser obtida por modelos isotrópicos. Em geral, as maiores limitações dependem da radiação difusa por variações nas subcomponentes circunsolar, brilho horizontal, isotrópicos e anisotrópicos. Este trabalho avaliou a influência do modelo de estimativa da radiação difusa na obtenção da radiação global incidente em superfícies inclinadas a 12.85º, 22,85º e 32,85° para o Norte, na partição horária, sob diferentes condições 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 radiação difusa nas condições geográficas e climáticas locais. O aumento da inclinação proporcionou maiores dispersões entre valores medidos e estimados da radiação global. As maiores variações nos resíduos estatísticos foram encontrados para coeficientes de transmissividade atmosférica inferiores a 0,15 e em condições de céu nublado ocorreram melhores estimativa em função dos baixos níveis energéticos.Universidade Estadual Paulista, Departamento de Engenharia Rural, Faculdade de Ciências Agronômicas de BotucatuUniversidade Estadual Paulista (Unesp)Universidade Federal do Mato Grosso (UFMT)Escobedo, João Francisco [UNESP]Souza, Adilson Pacheco deMartins, Dinival [UNESP]2016-07-07T12:35:19Z2016-07-07T12:35:19Z2014info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article23-31application/pdfhttp://dx.doi.org/10.14583/2318-7670.v02n01a05Nativa, v. 2, n. 1, p. 23-31, 2014.2318-7670http://hdl.handle.net/11449/14076210.14583/2318-7670.v02n01a05ISSN2318-7670-2014-02-01-23-31.pdf2340617938554636Currículo Lattesreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengNativainfo:eu-repo/semantics/openAccess2024-04-30T14:00:22Zoai:repositorio.unesp.br:11449/140762Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-04-30T14:00:22Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv An assessment of the diffuse radiation models for prediction on hourly global radiation in tilted surface
Avaliação de modelos de estimativa da radiação difusa na obtenção da radiação global horária em superfícies inclinadas
title An assessment of the diffuse radiation models for prediction on hourly global radiation in tilted surface
spellingShingle An assessment of the diffuse radiation models for prediction on hourly global radiation in tilted surface
Escobedo, João Francisco [UNESP]
Atmospheric transmissivity
Statistical index
Parameterized models
Transmissividade atmosférica
Indicativos estatísticos
Modelos parametrizados
title_short An assessment of the diffuse radiation models for prediction on hourly global radiation in tilted surface
title_full An assessment of the diffuse radiation models for prediction on hourly global radiation in tilted surface
title_fullStr An assessment of the diffuse radiation models for prediction on hourly global radiation in tilted surface
title_full_unstemmed An assessment of the diffuse radiation models for prediction on hourly global radiation in tilted surface
title_sort An assessment of the diffuse radiation models for prediction on hourly global radiation in tilted surface
author Escobedo, João Francisco [UNESP]
author_facet Escobedo, João Francisco [UNESP]
Souza, Adilson Pacheco de
Martins, Dinival [UNESP]
author_role author
author2 Souza, Adilson Pacheco de
Martins, Dinival [UNESP]
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Universidade Federal do Mato Grosso (UFMT)
dc.contributor.author.fl_str_mv Escobedo, João Francisco [UNESP]
Souza, Adilson Pacheco de
Martins, Dinival [UNESP]
dc.subject.por.fl_str_mv Atmospheric transmissivity
Statistical index
Parameterized models
Transmissividade atmosférica
Indicativos estatísticos
Modelos parametrizados
topic Atmospheric transmissivity
Statistical index
Parameterized models
Transmissividade atmosférica
Indicativos estatísticos
Modelos parametrizados
description 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, São 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.
publishDate 2014
dc.date.none.fl_str_mv 2014
2016-07-07T12:35:19Z
2016-07-07T12:35:19Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.14583/2318-7670.v02n01a05
Nativa, v. 2, n. 1, p. 23-31, 2014.
2318-7670
http://hdl.handle.net/11449/140762
10.14583/2318-7670.v02n01a05
ISSN2318-7670-2014-02-01-23-31.pdf
2340617938554636
url http://dx.doi.org/10.14583/2318-7670.v02n01a05
http://hdl.handle.net/11449/140762
identifier_str_mv Nativa, v. 2, n. 1, p. 23-31, 2014.
2318-7670
10.14583/2318-7670.v02n01a05
ISSN2318-7670-2014-02-01-23-31.pdf
2340617938554636
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Nativa
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 23-31
application/pdf
dc.source.none.fl_str_mv Currículo Lattes
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1799964527228354560

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