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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NUMERICAL STUDY OF COUPLED HEAT AND MASS TRANSFER IN BUILDING ENVELOPES BASED ON TEMPERATURE AND CAPILLARY PRESSURE GRADIENTS

DOI: 10.1615/TFESC1.cmd.013040
pages 419-432

Mustapha Maliki
LCTPE Laboratory, Civil engineering & architecture department, University Abdelhamid Ibn Badis, 300 Belhacel Road, Mostaganem 27000, Algeria

Nadia Laredj
LCTPE Laboratory, Civil engineering & architecture department, University Abdelhamid Ibn Badis, 300 Belhacel Road, Mostaganem 27000, Algeria

Karim Bendani
LCTPE Laboratory, Civil engineering & architecture department, University Abdelhamid Ibn Badis, 300 Belhacel Road, Mostaganem 27000, Algeria

H. Missoum
LCTPE Laboratory, Civil engineering & architecture department, University Abdelhamid Ibn Badis, 300 Belhacel Road, Mostaganem 27000, Algeria


KEY WORDS: Coupled heat and moisture transfer, relative humidity, multi-layer wall, porous media, building simulation

Abstract

This work reports on a transient heat, air and moisture transfer (HAM) model. The governing partial-differential equations are simultaneously solved for temperature and capillary pressure through multi-layered porous media, including the non-linear transfer and storage properties of materials. Using partial differential equations (PDEs) functions, certain measurable properties of porous media are converted into coefficients depending on temperature and capillary pressure. Major features of the model are multi-dimensional and transient coupling of heat, air and moisture transport. The coupled PDEs are solved using the COMSOL Multiphysics time-dependent solver. This solver enables HAM (Heat, Air, Moisture) modeling in porous media. Besides, the good agreements obtained with the respective HAMSTAD benchmarks (1D and 2D) suggest that the model can be used to assess the hygrothermal performance of building envelope components. Being able to evaluate the hygrothermal behaviour, the proposed model may turn out to be a valuable tool for other building problems.

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