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Two-dimensional hygrothermal transfer in porous building materials
Authors:Menghao Qin  Abdelkarim Aït-Mokhtar  Rafik Belarbi
Affiliation:1. School of Architecture, Nanjing University, China;2. School of Planning, Architecture and Civil Engineering, Queen’s University Belfast, UK;3. LEPTAB, University of La Rochelle, France;1. Institute of Building Environment and Energy, China Academy of Building Research, 100013 Beijing, PR China;2. KU Leuven, Department of Civil Engineering, Building Physics Section, 3001 Leuven, Belgium;1. ITeCons – Institute for Research and Technological Development in Construction Sciences, Rua Pedro Hispano, s/n, Pólo II da Universidade, 3030-289 Coimbra, Portugal;2. Department of Civil Engineering, Faculty of Sciences and Technology University of Coimbra, Rua Luís Reis Santos – Pólo II da Universidade, 3030-788 Coimbra, Portugal;3. CONSTRUCT-LFC – Building Physics Laboratory, Department of Civil Engineering, Faculty of Engineering University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;4. ADAI/LAETA, Association for the Development of Industrial Aerodynamics, University of Coimbra, Coimbra, Portugal;1. Agricultural Engineering Department, Faculty of Agriculture at Moshtohor, Benha University, Egypt;2. Vienna University of Technology, Institute of Building Construction and Technology, Research Centre of Building Physics and Sound Protection, Karlsplatz 13/206-2, A-1040 Vienna, Austria;3. Vienna University of Technology, Institute of Building Construction and Technology, Research Centre of Building Construction and Rehabilitation, Karlsplatz 13/206-4, A-1040 Vienna, Austria
Abstract:A two-dimensional mathematical model for evaluating the simultaneous heat and moisture migration in porous building materials was proposed. Vapor content and temperature were chosen as the principal driving potentials. The numerical solution was based on the control volume finite difference technique with fully implicit scheme in time. Two validation experiments were developed in this study. The evolution of transient moisture distributions in both one-dimensional and two-dimensional cases was measured. A comparison between experimental results and those obtained by the numerical model proves that they are fully consistent with each other. The model can be easily integrated into a whole building heat, air and moisture transfer model. Another main advantage of the present numerical method lies in the fact that the required moisture transport properties are comparatively simple and easy to determine.
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