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Stockage d’énergie thermique par changement de phase – Application aux réseaux de chaleur

Abstract : This study is about a shell and tubes latent heat thermal energy storage system. This system is expected to be integrated in a district heating network substation. Heat transfers inside the PCM as well as convection flow regime inside the heat transfer fluid are investigated.A first experimental study aims at demonstrating the necessity of internal insert inside the tubes in order to avoid mixed convection flow regime. Two highly finned tubes as well as two inserts are tested. Inserts are either cylindrical or helical. Better thermal performances are obtained with the helical one. Besides, it is shown that free convection, between the fins is negligible. Effective thermal conductivities are estimated with an experimental and analytical approach at 7.4 and 10.9 W/m/K for the 7 fpi and the 10 fpi tube.A second test campaign is carried out with metallic foams. The first one is stochastic and in copper while the second one is regular and in alumina. Effective thermal conductivities are around 13.4 and 39.4 W/m/K respectively. The copper foam heat exchanger is shown to be better than a copper finned tube in terms of stored energy and thermal power, whereas only half the mass of the fins is used in the foam.Eventually a CFD numerical model is experimentally validated. This model shows that free convection inside the PCM is negligible on the overall thermal performances even though it modifies the solid/liquid interface shape locally.
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Submitted on : Monday, January 22, 2018 - 2:29:45 PM
Last modification on : Tuesday, October 20, 2020 - 11:33:21 AM

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  • HAL Id : tel-01412771, version 3

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Matthieu Martinelli. Stockage d’énergie thermique par changement de phase – Application aux réseaux de chaleur. Thermique [physics.class-ph]. Université Grenoble Alpes, 2016. Français. ⟨NNT : 2016GREAI084⟩. ⟨tel-01412771v3⟩

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