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Coupled heat and moisture transfer in multi-layer building materials

In English

Författare

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.

Publiceringsår

2009

Språk

Engelska

Sidor

967-975

Publikation/Tidskrift/Serie

Construction and Building Materials

Volym

23

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Materials Engineering

Nyckelord

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

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0950-0618