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dc.contributor.authorTejedor Herrán, Blanca
dc.contributor.authorCasals Casanova, Miquel
dc.contributor.authorMacarulla Martí, Marcel
dc.contributor.authorGiretti, Alberto
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria de Projectes i de la Construcció
dc.identifier.citationTejedor, B. [et al.]. U-value time series analyses: Evaluating the feasibility of in-situ short-lasting IRT tests for heavy multi-leaf walls. "Building and environment", 15 Juliol 2019, vol. 159, p. 1-19.
dc.description.abstractA gap in standardization of quantitative infrared thermography (IRT) directly leads to a lack of measurement pattern for determining in-situ U-values of heavy multi-leaf walls. Three groups of causal factors might influence the estimation of this build quality indicator: operating conditions, thermophysical properties and technical conditions. Focusing on the last one, previous studies underlined the difficulties of measuring below 3¿h. In contrast to active IRT, no algorithms have been found to process images, despite playing an important role in the effectiveness and robustness of IRT. The traditional approach involves analysing from 120 to 7200 thermograms with a data acquisition interval of 1¿min up to 1¿s respectively. The aim of this paper was to critically assess the test duration that is traditionally used. Six real heavy multi-leaf walls were tested under a stationary regime as a stochastic process of underlying data. For the first time, a research based on two U-value time series analyses (statistical tests and a signal modelling technique by MATLAB) demonstrated the feasibility of short-lasting IRT tests. Moreover, this research posed an innovative data management tool to automate this non-destructive testing (NDT) in mid-term, stopping IRT tests in real time once the right level of accuracy was achieved.
dc.format.extent19 p.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Edificació
dc.subject.lcshTemperature control
dc.subject.lcshBuildings - Energy conservation
dc.subject.otherQuantitative infrared thermography (IRT)
dc.subject.otherIn-situ U-Value
dc.subject.otherTest duration
dc.subject.otherTime-series analysis
dc.subject.otherWhite noise
dc.subject.otherSignal modelling
dc.titleU-value time series analyses: Evaluating the feasibility of in-situ short-lasting IRT tests for heavy multi-leaf walls
dc.subject.lemacTemperatura -- Control
dc.subject.lemacEdificis -- Estalvi d'energia
dc.contributor.groupUniversitat Politècnica de Catalunya. GRIC - Grup de Recerca i Innovació de la Construcció
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (author's final draft)
local.citation.authorTejedor, B.; Casals, M.; Macarulla, M.; Giretti, A.
local.citation.publicationNameBuilding and environment

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