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Analyse de l'impact des propriétés radiatives de façades pour la performance énergétique de bâtiments d'un environnement urbain dense

Abstract : Modified heat and mass transfer in the urban built and anthropogenic loads contribute to the urban heat island phenomenon as to the deterioration of building energy efficiency. The scope of this study is to define the impact implied by the modification of façade radiative properties that can be achieved by using selective cool-coloured coatings initially developed for roofing. Sensible heat transfers and consequences on building comfort are studied through a characteristic morphology from dense urban environment, the street canyon. Monitoring of surface energy budget on elementary discs of different radiative properties allowed us to develop, through optimisation method, a process to determine simultaneously the effective solar absorptivities and a convective heat transfer coefficient on the measurement period. The following step consists in an experimental analysis of cool selective paints in the chosen canyon configuration. A reduced-scale model (1/10th) of an urban scene has been designed with 5 rows of hollow concrete tanks that had temperatures and radiative fluxes monitored. Measured data for uniform coatings allowed highlighting the temperature evolution linked to the particular urban form. Afterwards, three façades radiative properties configurations have been studied simultaneously and allowed the analysis of those specific modifications on air and surface temperature fields. Lastly, in order to estimate energy consumption savings on real scale buildings as well as the impact on the near urban environment, a parametric study on coating of façades and roads has been performed through simulation taking into account interactive heat transfers between the built environment and the microclimate. The experiments and methods designed along the study permit to consider façade coating development and global efficiency characterization.
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Submitted on : Monday, November 29, 2010 - 4:17:14 PM
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Maxime Doya. Analyse de l'impact des propriétés radiatives de façades pour la performance énergétique de bâtiments d'un environnement urbain dense. Autre. Université de La Rochelle, 2010. Français. ⟨NNT : 2010LAROS296⟩. ⟨tel-00537691v2⟩

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