Issue |
E3S Web Conf.
Volume 172, 2020
12th Nordic Symposium on Building Physics (NSB 2020)
|
|
---|---|---|
Article Number | 14008 | |
Number of page(s) | 8 | |
Section | Material properties measurement | |
DOI | https://doi.org/10.1051/e3sconf/202017214008 | |
Published online | 30 June 2020 |
Novel active method for the estimation of a building wall thermal resistance
1 Univ Paris Est Creteil, CERTES, F-94010 Creteil, France
2 Saint-Gobain Research Paris, 39 quai Lucien Lefranc, 93300 Aubervilliers, France
* Corresponding author: adrien.francois@u-pec.fr
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 steady-state characterization of the wall. The method also demonstrated a good reproducibility.
© The Authors, published by EDP Sciences, 2020
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