Coupled heat and moisture transfer in multi-layer building materials

Menghao Qin, Rafik Belarbi, Abdelkarim Aït-Mokhtar, Lars-Olof Nilsson

    Research output: Contribution to journalArticle

    111 Citations (Scopus)

    Abstract

    A dynamic mathematical model for simulating the coupled heat and moisture migration through multilayer 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.
    Original languageEnglish
    Pages (from-to)967-975
    Number of pages9
    JournalConstruction and Building Materials
    Volume23
    Issue number2
    DOIs
    Publication statusPublished - Feb 2009

    ASJC Scopus subject areas

    • Civil and Structural Engineering
    • Building and Construction
    • Materials Science(all)

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