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Characterising the effects of wind-driven rain on the thermophysical performance of cavity walls by means of a Bayesian framework

Gori, V; Marincioni, V; Altamirano, H; (2021) Characterising the effects of wind-driven rain on the thermophysical performance of cavity walls by means of a Bayesian framework. In: Journal of Physics: Conference Series. (pp. pp. 1-9). IOP Science Green open access

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Abstract

Cavity wall is one of the most common construction types in temperate maritime climates, including the UK. However, water penetration may lead to damp within the structure, freeze-thaw damage at the outer surface and a reduction in thermal resistance. The magnitude of wetting effects on the energy performance of cavity walls is still unclear, with potentially significant implications for climate-change-mitigation strategies. This paper investigates the thermophysical performance of uninsulated and insulated cavity walls and its degradation as the element is wettened. Experiments were performed in a hygrothermal laboratory where two cavity-wall specimens (one of which coated with external waterproofing treatment) were tested under a high wind-driven rain exposure. Changes in the thermophysical performance between dry and wet conditions were evaluated through U-value testing and Bayesian inference. Substantial U-value increase was observed for wet uninsulated specimens (compared to dry conditions); conversely, closer U-value ranges were obtained when insulated with EPS grey beads. Moreover, latent-heat effects through the external masonry leaf of the untreated specimen were predicted by the Bayesian framework. Results suggest a negligible efficacy of waterproofing surface treatments as strategies for the reduction of heat transfer within the element, and possible effects of these agents on the evaporative and drying process.

Type: Proceedings paper
Title: Characterising the effects of wind-driven rain on the thermophysical performance of cavity walls by means of a Bayesian framework
Event: 8th International Building Physics Conference (IBPC 2021)
Location: Copenhagen, Denmark
Dates: 25th-27th August 2021
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1742-6596/2069/1/012053
Publisher version: https://doi.org/10.1088/1742-6596/2069/1/012053
Language: English
Additional information: © 2021 IOP Publishing. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (http://creativecommons.org/licenses/by/3.0).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/10139694
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