Empirical investigation of the hygrothermal diffusion properties of permeable building membranes subjected to variable relative humidity condition
| Autor: | Mark Dewsbury, Hartwig M. Künzel, Toba Samuel Olaoye |
|---|---|
| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
mould
Technology hygrothermal analysis Control and Optimization Materials science 020209 energy 0211 other engineering and technologies Energy Engineering and Power Technology 02 engineering and technology interstitial condensation Electrical resistivity and conductivity diffusion resistivity energy efficiency moisture management permeable building membranes varying relative humidity 021105 building & construction 0202 electrical engineering electronic engineering information engineering Relative humidity Electrical and Electronic Engineering Diffusion (business) Composite material Envelope (mathematics) Engineering (miscellaneous) Renewable Energy Sustainability and the Environment Humidity food and beverages Test method humanities Interstitial condensation Building envelope Energy (miscellaneous) |
| Zdroj: | Energies; Volume 14; Issue 13; Pages: 4053 Energies, Vol 14, Iss 4053, p 4053 (2021) |
| Popis: | Hygrothermal modelling is increasingly used to inform building envelope design. A key input for these calculations is the material’s vapour diffusion properties. Respecting a growing international concern, this research has questioned the appropriateness of the current test method to establish construction material for vapour diffusion properties. This article reports on the empirical measurement of the vapour diffusion properties of two vapour-permeable building membranes commonly used in Australia residential systems when subjected to variable relative humidity conditions. The method involved completing dry cup and wet cup standard tests as specified in ISO 12572, (23 °C and 50% relative humidity RH). Further tests were then conducted as temperature remained at 23 °C but the relative humidity changed to 35%, 65% and 80%, respectively, in order to know if the diffusion properties are the same or change with varying relative humidity. The results from the wet cup and dry cup tests under different relative humidity conditions were non-linear and different. These results indicate vapour-permeable membranes behave differently when exposed to different relative humidity conditions. In conclusion, this research demonstrates that the current vapour resistivity test method is inadequate, hence the need to establish more detailed diffusion resistivity properties in different humidity ranges that represent conditions experienced within a building’s external envelope. |
| Databáze: | OpenAIRE |
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