A comparison of standardized calculation methods for in situ measurements of facades U-value

In recent years, a growing concern has been how to determine the actual thermal behaviour of façades in their operational stage, in order to establish appropriate energy-saving measures. This paper aims at comparing standardized methods for obtaining the actual thermal transmittance of existing buil...

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Autores: Gaspar Fàbregas, Kàtia|||0000-0003-3842-1401, Casals Casanova, Miquel|||0000-0001-5379-894X, Gangolells Solanellas, Marta|||0000-0001-7921-595X
Formato: artículo
Fecha de publicación:2016
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/132231
Acesso em linha:https://hdl.handle.net/2117/132231
https://dx.doi.org/10.1016/j.enbuild.2016.08.072
Access Level:acceso abierto
Palavra-chave:Insulation (Heat)
Facades
U-value calculation
Thermal transmittance
Average method
Dynamic method
In-situ measurements
Facade
Aïllament tèrmic
Façanes
Àrees temàtiques de la UPC::Edificació::Instal·lacions i acondicionament d'edificis::Aïllament acústic i tèrmic
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repository_id_str
spelling A comparison of standardized calculation methods for in situ measurements of facades U-valueGaspar Fàbregas, Kàtia|||0000-0003-3842-1401Casals Casanova, Miquel|||0000-0001-5379-894XGangolells Solanellas, Marta|||0000-0001-7921-595XInsulation (Heat)FacadesU-value calculationThermal transmittanceAverage methodDynamic methodIn-situ measurementsFacadeAïllament tèrmicFaçanesÀrees temàtiques de la UPC::Edificació::Instal·lacions i acondicionament d'edificis::Aïllament acústic i tèrmicIn recent years, a growing concern has been how to determine the actual thermal behaviour of façades in their operational stage, in order to establish appropriate energy-saving measures. This paper aims at comparing standardized methods for obtaining the actual thermal transmittance of existing buildings’ façades, specifically the average method and the dynamic method defined by ISO 9869-1:2014, to verify which best fits theoretical values. The paper also aims to promote the use of the dynamic method, and facilitate its implementation. Differences between the theoretical U-value and the measured U-value obtained using the average and dynamic methods were calculated in three case studies, and then compared. The results showed that differences between the theoretical and the measured U-value were lower when the dynamic method was used. Particularly, when testing conditions were not optimal, the use of the dynamic method significantly improved the fit with the theoretical value. Moreover, measurements of the U-value using the dynamic method with a sufficiently large dataset showed a better fit to the theoretical U-value than the results of other dynamic methods proposed by authors. Further research should consider the optimum size of the dataset to obtain a measured U-value that is correctly adjusted to the theoretical U-value.Peer Reviewed20162016-10-1520192019-04-29journal articlehttp://purl.org/coar/resource_type/c_6501AOhttp://purl.org/coar/version/c_b1a7d7d4d402bcceinfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/132231https://dx.doi.org/10.1016/j.enbuild.2016.08.072reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1322312026-05-27T15:37:01Z
dc.title.none.fl_str_mv A comparison of standardized calculation methods for in situ measurements of facades U-value
title A comparison of standardized calculation methods for in situ measurements of facades U-value
spellingShingle A comparison of standardized calculation methods for in situ measurements of facades U-value
Gaspar Fàbregas, Kàtia|||0000-0003-3842-1401
Insulation (Heat)
Facades
U-value calculation
Thermal transmittance
Average method
Dynamic method
In-situ measurements
Facade
Aïllament tèrmic
Façanes
Àrees temàtiques de la UPC::Edificació::Instal·lacions i acondicionament d'edificis::Aïllament acústic i tèrmic
title_short A comparison of standardized calculation methods for in situ measurements of facades U-value
title_full A comparison of standardized calculation methods for in situ measurements of facades U-value
title_fullStr A comparison of standardized calculation methods for in situ measurements of facades U-value
title_full_unstemmed A comparison of standardized calculation methods for in situ measurements of facades U-value
title_sort A comparison of standardized calculation methods for in situ measurements of facades U-value
dc.creator.none.fl_str_mv Gaspar Fàbregas, Kàtia|||0000-0003-3842-1401
Casals Casanova, Miquel|||0000-0001-5379-894X
Gangolells Solanellas, Marta|||0000-0001-7921-595X
author Gaspar Fàbregas, Kàtia|||0000-0003-3842-1401
author_facet Gaspar Fàbregas, Kàtia|||0000-0003-3842-1401
Casals Casanova, Miquel|||0000-0001-5379-894X
Gangolells Solanellas, Marta|||0000-0001-7921-595X
author_role author
author2 Casals Casanova, Miquel|||0000-0001-5379-894X
Gangolells Solanellas, Marta|||0000-0001-7921-595X
author2_role author
author
dc.subject.none.fl_str_mv Insulation (Heat)
Facades
U-value calculation
Thermal transmittance
Average method
Dynamic method
In-situ measurements
Facade
Aïllament tèrmic
Façanes
Àrees temàtiques de la UPC::Edificació::Instal·lacions i acondicionament d'edificis::Aïllament acústic i tèrmic
topic Insulation (Heat)
Facades
U-value calculation
Thermal transmittance
Average method
Dynamic method
In-situ measurements
Facade
Aïllament tèrmic
Façanes
Àrees temàtiques de la UPC::Edificació::Instal·lacions i acondicionament d'edificis::Aïllament acústic i tèrmic
description In recent years, a growing concern has been how to determine the actual thermal behaviour of façades in their operational stage, in order to establish appropriate energy-saving measures. This paper aims at comparing standardized methods for obtaining the actual thermal transmittance of existing buildings’ façades, specifically the average method and the dynamic method defined by ISO 9869-1:2014, to verify which best fits theoretical values. The paper also aims to promote the use of the dynamic method, and facilitate its implementation. Differences between the theoretical U-value and the measured U-value obtained using the average and dynamic methods were calculated in three case studies, and then compared. The results showed that differences between the theoretical and the measured U-value were lower when the dynamic method was used. Particularly, when testing conditions were not optimal, the use of the dynamic method significantly improved the fit with the theoretical value. Moreover, measurements of the U-value using the dynamic method with a sufficiently large dataset showed a better fit to the theoretical U-value than the results of other dynamic methods proposed by authors. Further research should consider the optimum size of the dataset to obtain a measured U-value that is correctly adjusted to the theoretical U-value.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-10-15
2019
2019-04-29
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AO
http://purl.org/coar/version/c_b1a7d7d4d402bcce
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/132231
https://dx.doi.org/10.1016/j.enbuild.2016.08.072
url https://hdl.handle.net/2117/132231
https://dx.doi.org/10.1016/j.enbuild.2016.08.072
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,198674

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