Abstract
The walls of buildings experience heat, air and moisture transfers. These transfers have a significant influence on indoor climate, since they affect the value of temperature and relative humidity inhouses. High levels of humidity lead to pathologies in the buildings, and influence the air quality and the hygrothermal comfort of the occupants. In this work, a numerical analysis of the behaviour of polystyrene mortar under hydric solicitations was led. The simulations were held using ComsolMultiphysics and MATLAB. There were two different moisture transfer models used in this work: the first one took into account sorption hysteresis phenomenon, and the other one did not. The computed results showed that considering sorption hysteresis in modelling the hydric behaviour of the material allows obtaining more accurate results comparing to a model that does not consider hysteresis.
Highlights
Building sector is the most energy-consuming sector in the world [1,2], and in in France where it represents 43% of the total energy consumption [3]
Afterwards, we present the evolution of water content profiles obtained with the hysteresis model and the model that does not take into account hysteresis
The same logic is used for the main desorption curve, where the water content corresponding to each relative humidity value is found on the main desorption curve
Summary
Building sector is the most energy-consuming sector in the world [1,2], and in in France where it represents 43% of the total energy consumption [3] This led to thoughts about the improvement of the insulation in buildings through innovative building materials, in the context of promoting energy efficiency. Polystyrene concrete is a good alternative to usual building materials in modern construction applications. Polystyrene concrete significantly reduces the load of the construction due to its low density. It is characterized by its lower thermal and acoustic conductivity, and its improved durability properties [4,5]
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