Hygroscopic properties of wood have significant impact on water vapor diffusion in this material. For the description of this phenomenon the water vapor permeability dependence on relative humidity or partial water vapor pressure can be used. Analytical expression of the diffusion coefficient of wood was modified in order to obtain values for the water vapor permeability. For the verification a cup method experiment at 25, 62.5 and 75% average relative humidity was performed and the results were compared to other researches. Calculated data formed the input of a numerical model, in which a stationary linear analysis with a nonlinear analysis was compared, taking the variability of diffusion properties into account in the construction details of vapor diffusion-open timber constructions. Differences in moisture fields were shown, which in some cases lead to underestimation of the risk of condensation or degradation of wood components in the building envelope, in other cases point to the actual better ability of wooden structures to divert moisture from the interior to the exterior of the building.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:190859 |
| Date | January 2015 |
| Creators | Maňák, Ondřej |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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