YANG, Yingying; WU, Tingting Vogt; SEMPEY, Alain; DUMOULIN, Jean; BATSALE, Jean-Christophe

doi:10.1016/j.enbuild.2018.12.002

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

YANG, Yingying
University of Shanghai for Science and Technology

WU, Tingting Vogt

SEMPEY, Alain

Langue

Article de revue

Ce document a été publié dans

Energy and Buildings. 2019-02, vol. 184, p. 141-151

Elsevier

Résumé en anglais

Thermal performances of building walls are significant for energy conservation. However, very few non-destructive evaluation methods exist to quantitatively diagnose the building walls in situ due to the walls’ large thickness. Moreover, most of the existing methods are inconvenient to implement in situ and take a long characterization time. This paper studies transient heat transfer to estimate the wall's thermal properties based on the thermal quadrupoles modelling. Semi-infinite boundary condition is assumed at the rear face of the wall. With this assumption, only the front face response of the wall is considered. The evaluation time is then effectively reduced within a few hours, and the diagnosis in situ is simplified without the measurement on the rear face of the wall. Experiments are carried out on two traditional multi-layered building wall cases using heating lamps. With the measured surface temperatures and heat fluxes, the unit-pulse response and unit-step response at the front surface of the investigated wall are reconstructed through a deconvolution approach and a TSVD (Truncated Singular Value Decomposition) inversion. The unit-step response curve is directly characterized by the thermal resistance, thermal effusivity and heat capacity of the wall, thus allowing us to estimate the wall properties. The characterization time for the two cases is less than 10 hours.< Réduire

Mots clés en anglais

thick building walls

short time NDSE

unit-step response

thermal quadrupoles modelling

Métadonnées

Partager cette publication !

Licence d’utilisation du document

Short time non-destructive evaluation of thermal performances of building walls by studying transient heat transfer

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

URI

DOI

Origine

Unités de recherche