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Thermo-economic optimization of a novel confined thermal energy storage system based on granular material

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dc.affiliation.dptoUC3M. Departamento de Ingeniería Térmica y de Fluidoses
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Ingeniería de Sistemas Energéticoses
dc.contributor.authorCano Pleite, Eduardo
dc.contributor.authorHernández Jiménez, Fernando
dc.contributor.authorGarcía Gutiérrez, Luis Miguel
dc.contributor.authorSoria Verdugo, Antonio
dc.contributor.funderEuropean Commissionen
dc.contributor.funderAgencia Estatal de Investigación (España)es
dc.date.accessioned2023-11-17T10:55:55Z
dc.date.available2023-11-17T10:55:55Z
dc.date.issued2023-04-01
dc.description.abstractConcentrated solar power is a suitable technology for production of green electricity. However, to attain a uniform electricity production, concentrated solar power should be coupled with large Thermal Energy Storage (TES) systems. Among the different technologies of TES systems, storage of sensible heat in granular material is widely used due to its simple operation. These TES systems store energy as an increase of temperature of a large mass of small solid particles, through which a fluid circulates exchanging heat. TES systems are typically operated in a fixed bed regime, maximizing their exergy output, thus limiting the maximum allowable velocity of the fluid flow. In this work, a novel confined bed is proposed to mechanically prevent the motion of the solid particles conforming the TES system even for high fluid velocities, to guarantee that the exhaust temperature of the fluid is maximum during a discharge process. In this novel confined bed, a thermocline evolves from bottom to top of the system, separating the low and high temperature of the bed during the discharge process. An analytical model was applied to describe the evolution of the thermocline and the effect of the different operating parameters on the thermocline thickness. The effect of the thermocline thickness was combined with a thermo-economic analysis of a confined bed TES system proposed for a case of study. The new confined bed here proposed was optimized considering thermodynamics aspects, namely the fluid exergy increment in the bed, and economic factors, specifically the total investment cost of the TES system. The optimization resulted in low values of the fluid velocity, between 0.2 and 0.4 m/s, but still higher than the minimum fluidization velocity of sand particles of 750 mum, justifying the requirement of a confined bed, and low bed aspect ratios, between 0.25 and 0.9, to prevent excessively high fluid pressure drops. However, the bed aspect ratio increases significantly for higher granular material particle sizes, up to a ratio of bed height to diameter of 3 for a particle size of 10 mm and a TES demand time of 6 h.en
dc.description.sponsorshipThis research was funded by the Spanish Government under the project STORESOL, reference number PID2019-109224RA-100. Eduardo Cano-Pleite also acknowledges support from the CONEX-Plus program funded by Universidad Carlos III de Madrid and the European Union's Horizon 2020 program under the Marie Sklodowska-Curie grant agreement No. 801538.en
dc.description.statusPublicadoes
dc.format.extent13
dc.identifier.bibliographicCitationApplied Thermal Engineering, (2023), 224:120123, (13 p.)en
dc.identifier.doihttps://doi.org/10.1016/j.applthermaleng.2023.120123
dc.identifier.issn1359-4311
dc.identifier.publicationfirstpage1
dc.identifier.publicationissue120123
dc.identifier.publicationlastpage13
dc.identifier.publicationtitleAPPLIED THERMAL ENGINEERINGen
dc.identifier.publicationvolume224
dc.identifier.urihttps://hdl.handle.net/10016/38895
dc.identifier.uxxiAR/0000033520
dc.language.isoengen
dc.publisherElsevier
dc.relation.projectIDGobierno de España. PID2019-109224RA-I00es
dc.relation.projectIDinfo:eu-repo/grant/Agreement/EC/H2020/801538en
dc.rights© 2023 The Authors. Published by Elsevier Ltd.en
dc.rightsThis is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by nc-nd/4.0/)es
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.accessRightsopen accessen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subject.ecienciaEnergías Renovableses
dc.subject.otherExergyen
dc.subject.otherGranular materialen
dc.subject.otherOptimizationen
dc.subject.otherThermoclineen
dc.subject.otherTESen
dc.subject.otherThermal energy storageen
dc.titleThermo-economic optimization of a novel confined thermal energy storage system based on granular materialen
dc.typeresearch article*
dc.type.hasVersionVoR*
dspace.entity.typePublication
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