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Etude de l'influence de la distribution de fluide sur le comportement thermohydraulique d'un réservoir de stockage thermique mono-cuve dual-media

Abstract : In the context of the development of renewable energies and energy recovery, thermal storage is a major topic of research. Amongst promising technologies, one-tank sensible heat storage is an interesting alternative solution to usual two-tanks technologies. The use of a granular porous media, instead of thermocline storages’ free fluid volume, allows to reduce the amount of the often-expensive heat transfer fluid. Few studies exist on the influence of fluid distribution at the inlet and outlet of the porous media over performances of this kind of technology.The bibliographical review of this subject showed that most of experimental and numerical studies on dual-media heat storages are mono-dimensional or regard fluid’s distribution as ideal, which means perpendicular to the overall flow. However, a recent study questions this hypothesis, raising the issue of the potential influence of fluid distribution for an industrial application. Moreover, studied porous media are generally composed of one-sized particles.First, an experimental campaign is carried out. A test facility, using a two-sized particles porous media, is used to realise charge and discharge cycles with monitoring of characteristic physical values. Three fluid distributions are available for the inlet and outlet of high temperature fluid. Collected data give first results on the influence of fluid distribution over this type of storage and direct the next part of this study. The analysis of data also allows to highlight the imperfections of the experimental facility and to search for their causes and consequences.Secondly, the functioning of the one-tank dual-media heat storage is numerically studied. A multidimensional numerical model is developed, taking into account the two-sized particles of the porous media. This model, developed from the study of the relevant literature, especially the previous work from Thermal Storage Laboratory at CEA-LITEN, is based on the solving of thermodynamics’ usual equations, adapted to a porous media. Its specificity is to solve one heat conservation equation for the fluid and one for each of the granular solid phases. The model is validated by comparing its results with these extracted from the previous experimental campaign, with an acceptable agreement.The developed model is used to carry out a theoretical study of the influence of fluid distribution over the behaviour of the storage. Several charge and discharge tests are done, under idealised conditions, on a system representing the experimental facility. Two fluid distributions are compared, one is perfectly spread and the other with a strong centred axial jet. The influence of natural convection and of the augmentation of fluid’s velocity related to distribution are studied by repeating the same tests having modified the physical parameters of the model. The tests link theses physical phenomena to observed behaviours.Lastly, experimental and numerical results are gathered and interpreted in the case of a possible industrial application. In the case where the highlighted impact of fluid distribution would be evaluated high enough, recommendations are given, based on previous results and on a bibliographical review on technical fluid distribution solutions in this type of heat storage.
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Submitted on : Wednesday, February 24, 2021 - 9:23:08 AM
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  • HAL Id : tel-03150746, version 1

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Grégoire Bellenot. Etude de l'influence de la distribution de fluide sur le comportement thermohydraulique d'un réservoir de stockage thermique mono-cuve dual-media. Mécanique des fluides [physics.class-ph]. Université Grenoble Alpes [2020-..], 2020. Français. ⟨NNT : 2020GRALI065⟩. ⟨tel-03150746⟩

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