Investigation on heat and moisture transfer in bio-based building wall with consideration of the hysteresis effect

Two mathematical models describing heat and moisture transfer in porous media were used to predict the hygrothermal behavior of a new type of bio-based materials made of date palm concrete (DPC). The finite element method was used for the resolution of partial differential equations and numerical re...

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Veröffentlicht in:Building and environment 2019-10, Vol.163, p.106333, Article 106333
Hauptverfasser: Alioua, Tarek, Agoudjil, Boudjemaa, Chennouf, Nawal, Boudenne, Abderrahim, Benzarti, Karim
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container_start_page 106333
container_title Building and environment
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creator Alioua, Tarek
Agoudjil, Boudjemaa
Chennouf, Nawal
Boudenne, Abderrahim
Benzarti, Karim
description Two mathematical models describing heat and moisture transfer in porous media were used to predict the hygrothermal behavior of a new type of bio-based materials made of date palm concrete (DPC). The finite element method was used for the resolution of partial differential equations and numerical results were compared to experimental data considering similar conditions of temperature and relative humidity through the DPC wall. At first, a mesh sensitivity analysis was carried out and the optimum mesh configuration was determined. Afterwards, the hysteresis effect was implemented in the models and its influence on the variation of the relative humidity through the wall was discussed. The results revealed that the proposed models globally provided satisfactory results for the DPC wall, with an improved accuracy when considering the hysteresis effect. Finally, a comparison in terms of thermal insulation and moisture buffering capacity between DPC and a classical building material was performed numerically. Results showed that the new bio-based wall is very promising and can contribute to mitigate temperature variation and ensure hydrothermal comfort in buildings. •Investigation on hygric and thermal performance of a bio-based concrete wall.•Implementation of hygrothermal models in a finite element software.•Validation of the numerical approach by comparison with experimental data.•Enhanced RH prediction when considering moisture hysteresis effects.•Superior thermal insulation and moisture buffering capacity of DPC over AAC.
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subjects Bio-based building materials
Biological materials
Buildings
Civil Engineering
Construction materials
Date palm concrete
Differential equations
Differential media
Engineering Sciences
Finite element method
Heat and moisture transfer
Humidity
Hygrothermal
Hysteresis
Hysteresis effect
Mathematical analysis
Mathematical models
Mechanics
Moisture
Partial differential equations
Porous media
Relative humidity
Sensitivity analysis
Temperature
Thermal insulation
Thermics
title Investigation on heat and moisture transfer in bio-based building wall with consideration of the hysteresis effect
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