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A comparison between on-site measured and estimated based adjustment factor values used to calculate heat losses to unconditioned spaces in dwellings

2022-01-31Journal article Open access
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dc.contributor.authorNepomuceno, Miguel
dc.contributor.authorMartins, Ana M. T.
dc.contributor.authorPinto, Hugo
dc.date.accessioned2022-02-17T16:28:13Z
dc.date.available2022-02-17T16:28:13Z
dc.date.issued2022-01-31
dc.description.abstractSteady-state methods have been widely used in Europe to analyse the energy performance of low-energy buildings. The accuracy of such methods depends on the assumptions regarding the compensation of non-stationary effects but also on the input design data, such as the temperature of unconditioned spaces (UnSp). This temperature depends mainly on the thermal characteristics of UnSp envelope, air ventilation rate, temperature of the conditioned spaces, and the external environment. External environment varies over time, daily and seasonally, making it difficult to accurately estimate UnSp temperature. European Union (EU) directives stated that the UnSp temperature can be evaluated by the adjustment factor (b) set by EN ISO 13789. However, each Member State may adjust procedures, by proposing simplified approaches, either for new or existing buildings. In this paper the b-values measured on-site in three dwellings were compared to those calculated by EN ISO 13789, as well as those estimated based on simplified procedures, allowed in the regulatory framework of some EU Member States, namely Ireland, Portugal, Spain, France, and Italy. The study allowed to conclude that EN ISO 13789 and Irish BR 443 provided similar values. However, if the purpose is to simplify procedures and reduce computation effort, French RE2020 proved to be very effective. The thermal characteristics of the UnSp envelope and air ventilation rate were identified as the parameters that most affect the estimation of the b-value, while thermal losses through linear thermal bridges and the ground do not seem to have a significant impact.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMiguel C. S. Nepomuceno, Ana M. T. Martins, Hugo A. S. Pinto. A comparison between on-site measured and estimated based adjustment factor values used to calculate heat losses to unconditioned spaces in dwellings, Buildings, 12(2):146 (2022). ISSN: 2075-5309. DOI: 10.3390/buildings12020146.pt_PT
dc.identifier.doi10.3390/buildings12020146pt_PT
dc.identifier.issn2075-5309
dc.identifier.urihttp://hdl.handle.net/10400.6/12030
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherMDPI AGpt_PT
dc.subjectHeat transferpt_PT
dc.subjectUnconditioned spacept_PT
dc.subjectAdjustment factorpt_PT
dc.subjectRegulationpt_PT
dc.subjectSimplified methodspt_PT
dc.subjectSteady-state regimept_PT
dc.subjectBuildingspt_PT
dc.subjectThermal envelopept_PT
dc.titleA comparison between on-site measured and estimated based adjustment factor values used to calculate heat losses to unconditioned spaces in dwellingspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.issue2pt_PT
oaire.citation.titleBuildingspt_PT
oaire.citation.volume12pt_PT
person.familyNameNepomuceno
person.familyNameMartins
person.familyNameSILVA PINTO
person.givenNameMiguel Costa Santos
person.givenNameAna Maria Tavares Ferreira
person.givenNameHUGO ALEXANDRE
person.identifierhttp://scholar.google.pt/citations?user=IguykP4AAAAJ
person.identifierE-2497-2012
person.identifier.ciencia-idF710-57AF-521F
person.identifier.ciencia-id2718-E82B-9E26
person.identifier.ciencia-id7C1D-9E64-9EC4
person.identifier.orcid0000-0003-3865-490X
person.identifier.orcid0000-0002-2591-0137
person.identifier.orcid0000-0002-1028-4655
person.identifier.scopus-author-idhttp://www.scopus.com/authid/detail.url?authorId=36246411800
person.identifier.scopus-author-id55915357500
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationd93f6f35-204d-4bd1-a38a-5ec3c39a31e3
relation.isAuthorOfPublication2e7990dc-8792-471a-926a-e5647b8a085a
relation.isAuthorOfPublication9d43398c-9ed8-49ba-96ae-dd85101c6170
relation.isAuthorOfPublication.latestForDiscovery9d43398c-9ed8-49ba-96ae-dd85101c6170

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