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Conference Papers Year : 2020

Novel active method for the estimation of a building wall thermal resistance

Abstract

The thermal resistance of a wall can be readily measured in steady-state. However, such a state is seldomly achieved in a building because of the variation of outdoor conditions as well as the high thermal inertia of building materials. This paper introduces a novel active (dynamic) method to measure the thermal resistance of a building wall. Not only are active approaches less sensitive to external temperature variations, they also enable to perform measurements within only a few hours. In the proposed methodology, an artificial thermal load is applied to a wall (heating of the indoor air) and its thermal response is monitored. Inverse techniques are used with a reduced model to estimate the value of the thermal resistance of a wall from the measured temperatures and heat fluxes. The methodology was validated on a known load-bearing wall built inside a climate chamber. The results were in good agreement with reference values derived from a steadystate characterization of the wall. The method also demonstrated a good reproducibility.
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Dates and versions

hal-04281892 , version 1 (13-11-2023)

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Adrien François, Laurent Ibos, Vincent Feuillet, Johann Meulemans. Novel active method for the estimation of a building wall thermal resistance. NSB 2020, Sep 2020, Tallin, Estonia. pp.14008, ⟨10.1051/e3sconf/20201721⟩. ⟨hal-04281892⟩

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