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Coupled heat and moisture transfer in multi-layer building materials

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Author

Summary, in English

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. (C) 2008 Elsevier Ltd. All rights reserved.

Publishing year

2009

Language

English

Pages

967-975

Publication/Series

Construction and Building Materials

Volume

23

Issue

2

Document type

Journal article

Publisher

Elsevier

Topic

  • Materials Engineering

Keywords

  • Experiments
  • Building materials
  • Coupled heat and moisture transfer
  • Modeling

Status

Published

ISBN/ISSN/Other

  • ISSN: 0950-0618