Nonisothermal moisture transport in hygroscopic building materials: modeling for the determination of moisture transport coefficients |
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Authors: | Menghao Qin Rafik Belarbi Abdelkarim Ait-Mokhtar Lars-Olof Nilsson |
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Institution: | (1) LEPTAB, La Rochelle University, Avenue Michel Crépeau, La Rochelle, 17142, France |
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Abstract: | A mathematical model for calculating the nonisothermal moisture transfer in building materials is presented in the article.
The coupled heat and moisture transfer problem was modeled. Vapor content and temperature were chosen as principal driving
potentials. The coupled equations were solved by an analytical method, which consists of applying the Laplace transform technique
and the Transfer Function Method. A new experimental methodology for determining the temperature gradient coefficient for
building materials was also proposed. Both the moisture diffusion coefficient and the temperature gradient coefficient for
building material were experimentally evaluated. Using the measured moisture transport coefficients, the temperature and vapor
content distribution inside building materials were predicted by the new model. The results were compared with experimental
data. A good agreement was obtained. |
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Keywords: | Nonisothermal moisture transfer Modeling Building materials Moisture transport coefficients |
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