The potential impact of low thermal transmittance construction on the European design guidelines of residential buildings
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/80672 https://doi.org/10.1016/j.enbuild.2018.08.009 |
Resumo: | European countries impose regulations for low thermal transmittance envelopes to improve the buildings' energy efficiency. However, in scientific literature, evidences are surfacing that such low U-values are affecting the validity of traditional design guidelines. The purpose of this paper is to analyze the implications of lowering the envelope U-values. To achieve this, 96000 residential buildings were generated, with random geometries and U-values, and their energy consumption evaluated for eight European locations. The buildings were grouped according to the envelope elements' thermal transmittance and the results statistically analyzed. For each group, six geometry-based indexes were correlated with the energy performance. As U-values decrease, the performance variation amplitude was found to reduce, making the geometry less important. However, in warm/moderate climates, low U-values tend to actually increase the energy consumption and also rise the performance variation, meaning that geometry regains importance. In this case, instead of helping reducing the heating demands, solar exposed windows and compact geometries raise the energy consumption. It is concluded that, for each climate location, there is an ideal U-value range for which the energy demand is low and the geometry effect becomes less significant, thus freeing designers to further explore building forms and window designs. |
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The potential impact of low thermal transmittance construction on the European design guidelines of residential buildingsgenerative design methoddynamic simulationresidential buildingsbuilding geometrythermal transmittanceEuropean countries impose regulations for low thermal transmittance envelopes to improve the buildings' energy efficiency. However, in scientific literature, evidences are surfacing that such low U-values are affecting the validity of traditional design guidelines. The purpose of this paper is to analyze the implications of lowering the envelope U-values. To achieve this, 96000 residential buildings were generated, with random geometries and U-values, and their energy consumption evaluated for eight European locations. The buildings were grouped according to the envelope elements' thermal transmittance and the results statistically analyzed. For each group, six geometry-based indexes were correlated with the energy performance. As U-values decrease, the performance variation amplitude was found to reduce, making the geometry less important. However, in warm/moderate climates, low U-values tend to actually increase the energy consumption and also rise the performance variation, meaning that geometry regains importance. In this case, instead of helping reducing the heating demands, solar exposed windows and compact geometries raise the energy consumption. It is concluded that, for each climate location, there is an ideal U-value range for which the energy demand is low and the geometry effect becomes less significant, thus freeing designers to further explore building forms and window designs.Elsevier2018-08info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/80672http://hdl.handle.net/10316/80672https://doi.org/10.1016/j.enbuild.2018.08.009eng0378-7788http://dx.doi.org/10.1016/j.enbuild.2018.08.009Rodrigues, EugénioFernandes, Marco S.Soares, NelsonGomes, ÁlvaroGaspar, Adélio RodriguesCosta, José J.info: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:RCAAP2022-05-25T01:34:01Zoai:estudogeral.uc.pt:10316/80672Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:03:00.007599Repositório 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 |
The potential impact of low thermal transmittance construction on the European design guidelines of residential buildings |
title |
The potential impact of low thermal transmittance construction on the European design guidelines of residential buildings |
spellingShingle |
The potential impact of low thermal transmittance construction on the European design guidelines of residential buildings Rodrigues, Eugénio generative design method dynamic simulation residential buildings building geometry thermal transmittance |
title_short |
The potential impact of low thermal transmittance construction on the European design guidelines of residential buildings |
title_full |
The potential impact of low thermal transmittance construction on the European design guidelines of residential buildings |
title_fullStr |
The potential impact of low thermal transmittance construction on the European design guidelines of residential buildings |
title_full_unstemmed |
The potential impact of low thermal transmittance construction on the European design guidelines of residential buildings |
title_sort |
The potential impact of low thermal transmittance construction on the European design guidelines of residential buildings |
author |
Rodrigues, Eugénio |
author_facet |
Rodrigues, Eugénio Fernandes, Marco S. Soares, Nelson Gomes, Álvaro Gaspar, Adélio Rodrigues Costa, José J. |
author_role |
author |
author2 |
Fernandes, Marco S. Soares, Nelson Gomes, Álvaro Gaspar, Adélio Rodrigues Costa, José J. |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Rodrigues, Eugénio Fernandes, Marco S. Soares, Nelson Gomes, Álvaro Gaspar, Adélio Rodrigues Costa, José J. |
dc.subject.por.fl_str_mv |
generative design method dynamic simulation residential buildings building geometry thermal transmittance |
topic |
generative design method dynamic simulation residential buildings building geometry thermal transmittance |
description |
European countries impose regulations for low thermal transmittance envelopes to improve the buildings' energy efficiency. However, in scientific literature, evidences are surfacing that such low U-values are affecting the validity of traditional design guidelines. The purpose of this paper is to analyze the implications of lowering the envelope U-values. To achieve this, 96000 residential buildings were generated, with random geometries and U-values, and their energy consumption evaluated for eight European locations. The buildings were grouped according to the envelope elements' thermal transmittance and the results statistically analyzed. For each group, six geometry-based indexes were correlated with the energy performance. As U-values decrease, the performance variation amplitude was found to reduce, making the geometry less important. However, in warm/moderate climates, low U-values tend to actually increase the energy consumption and also rise the performance variation, meaning that geometry regains importance. In this case, instead of helping reducing the heating demands, solar exposed windows and compact geometries raise the energy consumption. It is concluded that, for each climate location, there is an ideal U-value range for which the energy demand is low and the geometry effect becomes less significant, thus freeing designers to further explore building forms and window designs. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-08 |
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://hdl.handle.net/10316/80672 http://hdl.handle.net/10316/80672 https://doi.org/10.1016/j.enbuild.2018.08.009 |
url |
http://hdl.handle.net/10316/80672 https://doi.org/10.1016/j.enbuild.2018.08.009 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0378-7788 http://dx.doi.org/10.1016/j.enbuild.2018.08.009 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
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 |
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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) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799133922786803712 |