Effect of adsorption/desorption material hysteresis on the hygro- thermal performance of building structures

Author(s): Rémi Goulet, Anton L. Cottrill, Ali Assy
Paper category: Proceedings
Book title: International Conference on Sustainable Materials, Systems and Structures (SMSS 2019) Energy Efficient Building Design and Legislation
Editor(s): Marina Bagarić, Ivana Banjad Pečur, Hartwig M. Künzel
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 91-101
Total Pages: 11
Language: English

Abstract: Heat and moisture models do not usually account for adsorption/desorption hysteresis while calculating the hygrothermal performance of structures. Most models assume that the materials sorption behavior is properly described by the average curve between adsorption and desorption. As indicated in the literature, this may result in an under-estimation of the moisture-related damage risk. Here, we evaluate this assumption and the necessity to account for sorption hysteresis to accurately describe heat and moisture transport in wall assemblies. Pederson’s hysteresis model is mainly considered in this study. Materials with storage dominant over transport at longer time scales (6 months) are targeted, and therefore, two types of assemblies are studied: 1) an oriented strand board-based lightweight construction and 2) a massive concrete-based wall. Two climates are taken into account: Tokyo (Japan) and Seoul (South Korea). Based on the simulations, the hysteresis does not appear to have a major impact on either construction. However, a comparison of experimental scanning curves with Pedersen’s model at high relative humidity should also be performed to ensure model accuracy.

Online publication: 2019
Publication type : full_text
Public price (Euros): 0.00

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