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Simulation of the Hygrothermal Behavior of a Building Envelope based on Phase Change Materials and a bio-based concrete

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1483-1494页

作者： Dongxia Wu Mourad Rahim Wendong Li Mohammed El Ganaoui Rachid Bennacer University of Lorraine LERMABIUT H Poincaréde LongwyLongwy54400France University of Paris-Saclay ENS Paris-SaclayCNRSLMTGif-sur-Yvette91190France

Phase Change Materials(PCMs)have high thermal inertia,and hemp concrete(HC),a bio-based concrete,has strong hygroscopic *** previous studies,PCM has been extensively combined with many materials,however,most of these studies focused on thermal properties while neglecting hygroscopic *** this study,the two materials have been combined into a building envelope and the related hygrothermal properties have been *** particular,numerical studies have been performed to investigate the temperature and relative humidity behavior inside the HC,and the effect of adding PCM on the hygrothermal behavior of the *** results show that there is a high coupling between temperature and relative humidity inside the HC,since the relative humidity changes on the second and third days are different,with values of 8%and 4%,***,the variation of relative humidity with temperature indicates the dominant influence of temperature on relative humidity *** the presence of PCM,the temperature variation inside the HC is damped due to the high thermal inertia of the PCM,which also leads to suppression of moisture evaporation and thus damping of relative humidity *** the second and third days,the temperature changes at the central position are reduced by 4.6%and 5.1%,compared to the quarter *** the relative humidity change,the reductions are 5.3%and 5.4%on the second and third days,***,PCM,with high thermal inertia,acts as a temperature damper and has the potential to increase the moisture buffering capacity inside the *** makes it possible for such a combined envelope to have both thermal and hygric inertia.

关键词： Phase change material(PCM) bio-based concrete passive building envelope heat and moisture transfer hygrothermal performance

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