Article Dans Une Revue Journal of Energy Storage Année : 2022

Geometry optimisation of an industrial thermocline Thermal Energy Storage combining exergy, Life Cycle Assessment and Life Cycle Cost Analysis

Résumé

Recently, packed-bed storage has been considered as a promising alternative solution for thermal energy storageespecially for waste heat recovery in industrial plants. This work aims to optimise environmental footprint, costsand exergy efficiency of a thermocline thermal energy storage through two optimisation variables. These vari-ables describe the tank shape and the particle grain size. Two solid filler materials are compared: machinedceramic and ceramic from fly ashes. The reference storage is an existing industrial high-temperature air/bauxitepacked-bed storage called Eco-Stock®. A one-dimensional two-phase (fluid and solid) model is used to determinethe energy and exergy performance of the thermocline tank. For the life cycle assessment, four indicators areselected: cumulative energy demand, global warming potential, abiotic depletion potential and particulatematter. Finally, a life cycle cost analysis is performed to determine levelised cost of energy used as economiccriterion. This multi-objective problem is solved by the multi-criteria genetic algorithm available on the Matlab®platform. A Pareto set is obtained, bounded by the single exergy and environmental optimisation solutions. Theeconomic optimisation is found on the Pareto set, close to the environmental optimal solution. Favouring eco-nomic performance reduces the environmental footprint of the storage. Despite better exergy performance andsmaller tank volume, the exergy-optimised tank increases environmental impacts and costs due to higherpumping work. The environmental and economic optimisations lead to stocky tank shapes while a tapered tank isobtained for the exergy optimisation. According to the TOPSIS method, the economic optimal solution appears tobe the best trade-off for both fillers tested. Despite poorer thermophysical properties, the solution with ceramicfrom fly ashes shows similar exergy and economic performance as the machined ceramic solution (more than 96% of exergy efficiency for 3.1 c€/kWhth), while the environmental footprint is greatly reduced (61 vs 87 ca.year).This tank has a diameter of 2.6 m and a height of 1.7 m. The particle diameter is 11 mm.

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hal-04311700 , version 1 (08-04-2025)

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D. Le Roux, Régis Olivès, Pierre Neveu. Geometry optimisation of an industrial thermocline Thermal Energy Storage combining exergy, Life Cycle Assessment and Life Cycle Cost Analysis. Journal of Energy Storage, 2022, 55, pp.105776. ⟨10.1016/j.est.2022.105776⟩. ⟨hal-04311700⟩
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