Comparison and assessment of circumsolar ratio models for Évora, Portugal
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , |
Tipo de documento: | Artigo de conferência |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/27151 |
Resumo: | The sun rays are scattered due to molecules, aerosols and some cloud types, such as cirrus clouds, and a region near to the vicinity of the sun disk, known as circumsolar region, with relatively high diffuse sky radiance is formed [1]. Consequently, this diffuse radiation is called circumsolar normal irradiance (CSNI). Modelling the CSNI is important because pyrheliometers (the instruments that are used to measure direct normal irradiance – DNI), have an aperture angle wider than the circumsolar region, and thus DNI measurements obtained with these instruments cannot resolve the distribution of solar radiance in that region [2]. Moreover, since concentrated solar power (CSP) systems only capture solar radiation from this region but with a narrower aperture angle than that of the pyrheliometers, this leads to an overestimation of the energy reaching the receiver of the CSP systems [1]. This can result in misleading power output estimations, which can harm the bankability of CSP projects. Information on CSNI is also crucial when designing, sizing and operating CSP powerplants. |
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Comparison and assessment of circumsolar ratio models for Évora, PortugalCircumsolar IrradianceCircumsolar RatioThe sun rays are scattered due to molecules, aerosols and some cloud types, such as cirrus clouds, and a region near to the vicinity of the sun disk, known as circumsolar region, with relatively high diffuse sky radiance is formed [1]. Consequently, this diffuse radiation is called circumsolar normal irradiance (CSNI). Modelling the CSNI is important because pyrheliometers (the instruments that are used to measure direct normal irradiance – DNI), have an aperture angle wider than the circumsolar region, and thus DNI measurements obtained with these instruments cannot resolve the distribution of solar radiance in that region [2]. Moreover, since concentrated solar power (CSP) systems only capture solar radiation from this region but with a narrower aperture angle than that of the pyrheliometers, this leads to an overestimation of the energy reaching the receiver of the CSP systems [1]. This can result in misleading power output estimations, which can harm the bankability of CSP projects. Information on CSNI is also crucial when designing, sizing and operating CSP powerplants.Jornadas ICT2020-02-20T11:33:12Z2020-02-202020-02-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/27151http://hdl.handle.net/10174/27151engEdgar F.M. Abreu, Paulo Canhoto, Maria João Costa, Comparison and assessment of circumsolar ratio models for Évora, Portugal, Jornadas do ICT 2020, Braga, 2020.naonaosimeabreu@uevora.ptcanhoto@uevora.ptmjcosta@uevora.pt275Abreu, Edgar F.M.Canhoto, PauloCosta, Maria Joãoinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:22:19Zoai:dspace.uevora.pt:10174/27151Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:17:13.631769Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Comparison and assessment of circumsolar ratio models for Évora, Portugal |
title |
Comparison and assessment of circumsolar ratio models for Évora, Portugal |
spellingShingle |
Comparison and assessment of circumsolar ratio models for Évora, Portugal Abreu, Edgar F.M. Circumsolar Irradiance Circumsolar Ratio |
title_short |
Comparison and assessment of circumsolar ratio models for Évora, Portugal |
title_full |
Comparison and assessment of circumsolar ratio models for Évora, Portugal |
title_fullStr |
Comparison and assessment of circumsolar ratio models for Évora, Portugal |
title_full_unstemmed |
Comparison and assessment of circumsolar ratio models for Évora, Portugal |
title_sort |
Comparison and assessment of circumsolar ratio models for Évora, Portugal |
author |
Abreu, Edgar F.M. |
author_facet |
Abreu, Edgar F.M. Canhoto, Paulo Costa, Maria João |
author_role |
author |
author2 |
Canhoto, Paulo Costa, Maria João |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Abreu, Edgar F.M. Canhoto, Paulo Costa, Maria João |
dc.subject.por.fl_str_mv |
Circumsolar Irradiance Circumsolar Ratio |
topic |
Circumsolar Irradiance Circumsolar Ratio |
description |
The sun rays are scattered due to molecules, aerosols and some cloud types, such as cirrus clouds, and a region near to the vicinity of the sun disk, known as circumsolar region, with relatively high diffuse sky radiance is formed [1]. Consequently, this diffuse radiation is called circumsolar normal irradiance (CSNI). Modelling the CSNI is important because pyrheliometers (the instruments that are used to measure direct normal irradiance – DNI), have an aperture angle wider than the circumsolar region, and thus DNI measurements obtained with these instruments cannot resolve the distribution of solar radiance in that region [2]. Moreover, since concentrated solar power (CSP) systems only capture solar radiation from this region but with a narrower aperture angle than that of the pyrheliometers, this leads to an overestimation of the energy reaching the receiver of the CSP systems [1]. This can result in misleading power output estimations, which can harm the bankability of CSP projects. Information on CSNI is also crucial when designing, sizing and operating CSP powerplants. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-02-20T11:33:12Z 2020-02-20 2020-02-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/27151 http://hdl.handle.net/10174/27151 |
url |
http://hdl.handle.net/10174/27151 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Edgar F.M. Abreu, Paulo Canhoto, Maria João Costa, Comparison and assessment of circumsolar ratio models for Évora, Portugal, Jornadas do ICT 2020, Braga, 2020. nao nao sim eabreu@uevora.pt canhoto@uevora.pt mjcosta@uevora.pt 275 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Jornadas ICT |
publisher.none.fl_str_mv |
Jornadas ICT |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799136654575796224 |