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Hydrogen recovery from big-scale porous metal hydride(MH)reactor:impact of pressure and MH-thermophysical properties

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Energy Storage and Saving 2022年第4期1卷 259-271页

作者： atef chibani Slimane Merouani Aissa Dehane Cherif Bougriou Laboratory of Environmental Process Engineering Department of Chemical EngineeringUniversity Salah Boubanider Constantine 3ConstantineP.O.Box 72Algeria Department of Mechanical Engineering University of Mostefa Ben BoulaidBatna 2Batna05000Algeria Department of Process Engineering Faculty of Sciences and Applied SciencesLarbi Ben M’hidi University04000Oum El BouaghiAlgeria

An advanced ANSYS FLUENT-based model was developed for hydrogen recovery from a multi-tubular fixed-bed metal hydride(MH)reactor of large-scale *** model was firstly validated by comparing its results to specific experimental *** and heat transfer processes inside the fixed bed were investigated for various pressures and thermochemical characteristics of the MH(thermal conductivity,porosity and reaction parameters).The findings were reported as average,local and spatial changes in the metal’s bed temperature and hydrogen *** the initial stage of the endothermic desorption(t<100 s),the bed temperature dropped dramat-ically in all *** this time,there was a massive emission of *** bed temperature was then raised due to the reactor’s external convective heating,while the hydrogen release continued until the MH was completely *** dehydrogenation rate of the MH was enhanced when the discharge pressure was ***,some other characteristics of the MH,i.e.,porosity,thermal conductivity,desorption rate constant and activation energy,significantly impacted the resulting mass and heat fluxes inside the bed material.

关键词： Hydrogen storage Metal hydride(MH) Desorption Heat and mass transfer Mathematical model

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Melting/solidification of phase change material in a multi-tube heat exchanger in the presence of metal foam:effect of the geometrical configuration of tubes

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Energy Storage and Saving 2022年第4期1卷 241-258页

作者： atef chibani Aissa Dehane Slimane Merouani Cherif Bougriou Djemaa Guerraiche Laboratory of Environmental Process Engineering Department of Chemical EngineeringFaculty of Process EngineeringUniversity Salah Boubnider Constantine 3Constantine25000Algeria Department of Mechanical Engineering Faculty of TechnologyUniversity of Mostefa Ben BoulaidBatna 2Batna05000Algeria Faculty of Sciences and Applied Sciences Department of Process EngineeringLarbi Ben M’hidi UniversityOum El Bouaghi04000Algeria Applied Energy Physics Laboratory(LPEA) Physical DepartmentFaculty of Matter SciencesUniversity of Batna 1Batna05000Algeria

One of the likely methods for enhancing heat transfer in a latent thermal energy storage system is the conception of a thermal *** this study,the orientation of oval tubes(horizontal,vertical,and oblique)in phase change material(PCM,C_(19)-C_(20))-based shell-tube heat exchanger was analyzed with respect to the metal foam(MF)type(graphite,copper,and nickel)in comparison to the case of pure *** this purpose,a two-dimensional mathematical model was developed to investigate the thermal efficiency of the PCM-metal foam based composite energy storage *** was concluded that the orientation of the oval tubes(oblique,horizontal,and vertical)has a negligible impact on the performance of the thermal unit during the melting/solidification *** on the liquid/solid fraction,total enthalpy and the average temperature in the annular space,the performance of a heat exchanger during fusion/solidification periods is in the order:copper-MF>graphite-MF>nickel-MF>pure *** the adopted MF or the geometry of tubes,the melting process is expedited compared to the solidification mechanism.

关键词： Phase change material(PCM) Solidification process Melting process PCM-metal foam Heat exchanger

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