Bimodal particle distributions with increased thermal conductivity for solid particles as heat transfer media and storage materials

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dc.contributor.author Christen, Chase E.
dc.contributor.author Gómez Hernández, Jesús
dc.contributor.author Otanicar, Todd P.
dc.date.accessioned 2022-09-22T08:30:43Z
dc.date.issued 2022-03
dc.identifier.bibliographicCitation Christen, C. E., Gómez-Hernández, J., & Otanicar, T. P. (2022). Bimodal particle distributions with increased thermal conductivity for solid particles as heat transfer media and storage materials. In International Journal of Heat and Mass Transfer, 184, 122250-122265
dc.identifier.issn 0017-9310
dc.identifier.uri http://hdl.handle.net/10016/35759
dc.description.abstract Solid particles are being considered in several high temperature thermal energy storage systems and as heat transfer media in a variety of advanced power generation systems, particularly in concentrated solar power plants. The downside of such an approach is the low overall heat transfer coefficients caused by the inherently low thermal conductivity values of the low-cost solid media when coupled to heat exchanger for the power cycle working fluid. Choosing the right particle size distribution, emittance, and material of the solid media can all make a substantial difference in packed bed thermal conductivity. Current research though exclusively focuses on continuous unimodal distributions of particles. Here, we propose the use of a binary particle system with a bimodal size distribution to significantly increase packed bed thermal conductivity by reducing packed bed porosity. This is the first study related to ceramic solid particle heat transfer that has considered the thermal conductivity of non-unimodal size distributions at room and elevated temperatures. The following study found that for the binary particle system using Carbo particles CP 16/30 - CP 70/140 where the large particle volume fraction was 50% there was an 17-47% increase in packed bed thermal conductivity when compared with a nearly unimodal particle size distribution of CP 16/30 between 50 and 300 °C. Two different porosity and effective thermal conductivity models were studied, with one providing better prediction of porosity but both effective thermal conductivity models providing less predictive capacity. Importantly this approach can have a substantial impact of thermal performance, with little to no impact on the particle cost.
dc.description.sponsorship The authors would like to acknowledge partial support of this work from the U.S. Department of Energy Solar Energy Technologies Office under award number DE-EE0009375
dc.format.extent 15
dc.language.iso eng
dc.publisher ELSEVIER BV
dc.rights © 2021 Elsevier Ltd. All rights reserved.
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subject.other Particle
dc.subject.other Thermal conductivity
dc.subject.other Thermal energy storage
dc.subject.other Moving packed bed
dc.title Bimodal particle distributions with increased thermal conductivity for solid particles as heat transfer media and storage materials
dc.type article
dc.relation.publisherversion https://www.sciencedirect.com/science/article/pii/S0017931021013491?via%3Dihub#!
dc.subject.eciencia Ingeniería Industrial
dc.identifier.doi https://doi.org/10.1016/j.ijheatmasstransfer.2021.122250
dc.rights.accessRights embargoedAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 122250
dc.identifier.publicationlastpage 122265
dc.identifier.publicationtitle INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
dc.identifier.publicationvolume 184
dc.identifier.uxxi AR/0000029714
carlosiii.embargo.liftdate 2024-03-01
carlosiii.embargo.terms 2024-03-01
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