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Approche exergétique d'un procédé de réfrigération secondaire par coulis d'hydrates

Abstract : Hydrates slurries as two-phase secondary refrigerants (FFD) reduces the environmental impact of refrigeration systems because these fluids have a high energy density. Their use for cold storage could be a solution to an industrial cold distribution at various temperature levels (air-conditioning, cooling process or preservation temperature). An experimental device composed of a circulation loop and a formation tank enables to characterize the thermal-hydraulic properties of CO2 hydrates slurries in order to determine the viscosities and the convective heat transfer coefficients of hydrates slurries. With these hydraulic and thermal parameters, an energy study was carried out on the system. Within this study a numerical model was developed to evaluate the energy distribution in different experimental elements (hydrate formation tank and hydrates dissociation heat exchanger) and to determine the exergetic losses created by these components. A good agreement between the experimental data and the numerical model for the temperature evolution of the slurry has been shown. The study has confirmed that multi-phases fluids provide higher energy efficiency and less exergetic losses than one-phase fluids.
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Jérémy Oignet. Approche exergétique d'un procédé de réfrigération secondaire par coulis d'hydrates. Génie des procédés. Université Pierre et Marie Curie - Paris VI, 2015. Français. ⟨NNT : 2015PA066590⟩. ⟨tel-01661594⟩

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