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Thermocline thermal energy storage optimisation combining exergy and life cycle assessment

Abstract : Thermocline thermal energy storage is one of the most promising solutions for recovering waste heat in industrial plants. This paper aims to optimise the shape of a thermal energy storage to minimise its environmental impacts and maximise its exergy efficiency. The reference storage is an existing industrial high-temperature air/ceramic packed-bed heat storage called EcoStock®. The physical model used to determine the performances of the tank is a one dimensional model with two equations: one for the heat transfer fluid and one for the filler material. The environmental impacts are analysed using a life cycle assessment through four selected indicators: cumulative energy demand, global warming potential, abiotic depletion potential and particulate matter. To solve this multi-criteria problem, a particle swarm optimisation algorithm was applied with several exergy and environmental weighting factors. A Pareto set is obtained, bounded by the single exergy or environmental optimisations. Favouring exergy efficiency reduces the volume of the tank. However, environmental footprint of the tank is increased: the indicators of cumulative energy demand and abiotic depletion potential are considerably higher. The shape of the tank evolves with the exergy weight, from a square shape (environmental optimisation) to a tapered shape (exergy optimisation).
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Submitted on : Tuesday, October 5, 2021 - 6:32:52 PM
Last modification on : Friday, October 22, 2021 - 9:37:11 AM

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D. Le Roux, Yasmine Lalau, B. Rebouillat, Pierre Neveu, Régis Olivès. Thermocline thermal energy storage optimisation combining exergy and life cycle assessment. Energy Conversion and Management, Elsevier, 2021, 248, pp.1-11/114787. ⟨10.1016/j.enconman.2021.114787⟩. ⟨hal-03364905⟩

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