Coupled heat and moisture transfer in multi-layer building materials |
| |
Authors: | Menghao Qin Rafik Belarbi Abdelkarim Aït-Mokhtar Lars-Olof Nilsson |
| |
Affiliation: | 1. National Institute of Standards and Technology, 100 Bureau Drive, Mail Stop 8633, Gaithersburg, MD 20899, USA;2. LEPTAB, La Rochelle University, France;3. Division of Building Materials, Lund University, Sweden |
| |
Abstract: | A dynamic mathematical model for simulating the coupled heat and moisture migration through multi-layer porous building materials was proposed. Vapor content and temperature were chosen as the principal driving potentials. The discretization of the governing equations was done by the finite difference approach. A new experimental set-up was also developed in this study. The evolution of transient temperature and moisture distributions inside specimens were measured. The method for determining the temperature gradient coefficient was also presented. The moisture diffusion coefficient, temperature gradient coefficient, sorption–desorption isotherms were experimentally evaluated for some building materials (sandstone and lime-cement mortar). The model was validated by comparing with the experimental data with good agreement. Another advantage of the method lies in the fact that the required transport properties for predicting the non-isothermal moisture flow only contain the vapor diffusion coefficient and temperature gradient coefficient. They are relatively simple, and can be easily determined. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|