@ARTICLE{10.21494/ISTE.OP.2020.0547, TITLE={In situ measurement of the heat transfer coefficient on a building wall surface: h-measurement device based on a harmonic excitation}, AUTHOR={Adrien François, Laurent Ibos, Vincent Feuillet, Johann Meulemans, }, JOURNAL={Entropy: Thermodynamics – Energy – Environment – Economy }, VOLUME={1}, NUMBER={Issue 4}, YEAR={2020}, URL={http://www.openscience.fr/In-situ-measurement-of-the-heat-transfer-coefficient-on-a-building-wall-surface}, DOI={10.21494/ISTE.OP.2020.0547}, ISSN={2634-1476}, ABSTRACT={This paper presents a novel in situ measurement method of the total heat transfer coefficient on a building wall. The device developed is based on harmonic thermal load of the wall surface. In situ tests of the method were performed in a steady environment as well as in off-equilibrium conditions (generated using electrical heaters). The heat transfer coefficient was estimated to 7.5 and 9 W.m−2.K−1 respectively. A parametric analysis allows determining the optimum operating conditions. The results obtained were in good agreement with standard values found in the literature. Measurement uncertainties were evaluated and a simple analytical model of the device was also developed.}}