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Communication Dans Un Congrès Année : 2023

The storage and production of cold and mechanical work through a hybrid thermochemical process

Le stockage et la production de froid et de travail mécanique par un processus thermochimique hybride

Résumé

Solar energy and heat waste are widely accepted for being integrated as renewable energies today, as they are clean, effective, free and endless... However, being sources with an intermittent behaviour, effective utilization and technologies with storage functionalities are addressed and developed to be integrated within the source. Solid-gas thermochemical processes are cycles based on a reversible (endo/exo) chemical reaction. In the endothermic phase of the process, the recovery of heat permits to decompose the reactants allowing the desorb of the gas, its condensation and then its storage at ambient conditions. During the exothermic one, the condensed gas is evaporated at the evaporator producing cooling effect and the vapor flows toward the solid reactant performing the exothermic synthesis reaction and reforming again the solid-gas reactant. While such process is discontinuous, contrary to absorption cycles that aim also to recover and valorise heat into cold, a storage phase is oppered between the two phases of the process. Moreover, a wide range of salts can be used as reactants in such processes, adaptable to low and medium temperature ranges (< 200°C) necessary for the salt decomposition. In this study, an original hybrid thermochemical process is proposed to valorise heat and mass flows into cold and mechanical work by the integration of an expander on the gas line between the reactor and the evaporator. At CNRS-PROMES, a prototype is developed and composed of a reactor (shell-tubes type, 7 tubes each with 4.15 kg of reactive salt MnCl2 and cycling 3.35 kg of reactive gas NH3), condenser, evaporator, storage tanks and a 1 kWe scroll expander. The first experimentations of the prototype hold the proof of concept of the hybridization of such process by the continuous production of cold and mechanical work during the production phase. The coupling between the evaporator, expander, and reactor is shown while performing two protocols of experimentation: - Fixing the cold temperature and thus the pressure at the inlet of the expander. The electrical charge is varied at the generator, coupled to the expander, which changes the behaviour of the expander leading to have di erent pressure ratios at the expander and thus different synthesis reaction pressures; - Fixing the electrical charge and changing the cold temperature, thus changing the pressure at the inlet of the expander. This coupling between the components is analysed, and the analysis shows the antagonistic behaviour between the cold and mechanical productions, in addition to the detection of an optimum for the mechanical production. In this presentation, the concept of the hybrid thermochemical cycle is presented, and the developed prototype beside the experimental results are shown with their analysis (dynamic, antagonism, Clausius-Clapeyron...).
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Dates et versions

hal-04192041 , version 1 (31-08-2023)

Identifiants

  • HAL Id : hal-04192041 , version 1

Citer

Hasan Ghazale, Nathalie Mazet, Pierre Neveu, Maxime Perier-Muzet. Le stockage et la production de froid et de travail mécanique par un processus thermochimique hybride. Journées Nationales sur l'Énergie Solaire «Congrès JNES 2023», La Fédération de Recherche sur l’Energie Solaire, Jul 2023, Le Bourget-du-lac, France. ⟨hal-04192041⟩
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