Simultaneous heat and moisture transport in porous building materials: evaluation of nonisothermal moisture transport properties |
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Authors: | Menghao Qin Rafik Belarbi Abdelkarim Aït-Mokhtar Lars-Olof Nilsson |
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Affiliation: | (1) National Institute of Standards and Technology, Mail stop 8633, 100 Bureau Drive, Gaithersburg, MD 20899, USA;(2) LEPTAB, La Rochelle University, La Rochelle, France;(3) Division of Building Materials, Lund University, Lund, Sweden |
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Abstract: | The paper presents a mathematical model for calculating the nonisothermal moisture transfer in porous building materials.
The simultaneous heat and moisture transfer problem was modeled. Vapor content and temperature were chosen as principal driving
potentials. The coupled equations were solved by a numerical method. An 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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