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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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Experimental investigation of hygrothermal behavior of wooden-frame house under real climate conditions

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Energy and Built Environment 2023年第1期4卷 122-129页

作者： mourad rahim Rabah Djedjig Dongxia Wu Rachid Bennacer Mohammed EL Ganaoui University of Lorraine LERMABIUT H Poincaréde Longwy168 Rue de LorraineCosnes et Romain54400 LongwyFrance University of Paris-Saclay ENS Paris-SaclayCNRSLMT91190 Gif-sur-YvetteFrance

This paper deals with the experimental investigation of hygrothermal behavior of wooden-frame building *** experiment was based on in-situ monitoring of a full size experimental monozone house built at the University of *** in temperature and relative humidity inside and outside the envelope were logged simultaneously with local meteorological *** showed the high coupling between temperature and relative humidity variations within the envelope *** overall hygrothermal response of the wall highlighted an interesting hygrothermal dynamic behavior of the envelope which may contribute to mitigate variations of relative humidity inside the ***,relative humidity evolves within a range of values that can lead to mold growth at a certain position which may alter wooden envelope life.

关键词： 3 hygrothermal behavior Heat and mass transfer Wood Bio-based building envelope

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Measurements for Electric Dipole of Selected Clusters Sc<sub>n</sub>-C<sub>60</sub>in Gaseous Phase

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Journal of Modern Physics 2018年第3期9卷 349-356页

作者： Mohamad Abd El rahim Rabih mourad Michel Broyer Iyad Karamé Department of Physics Lebanese University Faculty of Sciences I Beirut Lebanon Laboratory of Catalysis Organometallic and Material LCOM Department of Chemistry Lebanese University Faculty of Sciences I Beirut Lebanon Institut Lumière Matière UMR 5306 Univ-Lyon Université Claude Bernard Lyon 1 Villeurbanne France

We have measured the electric dipole moment of several Scn-C60 molecules (n = 1 - 6) in gaseous phase, by coupling a matrix-assisted laser desorption source to an electric beam deflection setup which is an electric equivalent of the famous Stern Gerlach [1] one. Experimental results are compared to a qualitative charge transfer that occurs between Sc and fullerene.

关键词： Electric Dipole Moment Scn-C60 Electric Deflection Charge Transfer

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