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

Christen, Chase E.; Gómez Hernández, Jesús; Otanicar, Todd P.

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

carlosiii.embargo.liftdate	2024-03-01
carlosiii.embargo.terms	2024-03-01
dc.affiliation.dpto	UC3M. Departamento de Ingeniería Térmica y de Fluidos	es
dc.affiliation.grupoinv	UC3M. Grupo de Investigación: Tecnologías Apropiadas para el Desarrollo Sostenible	es
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.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.	en
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	en
dc.format.extent	15
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	en
dc.identifier.doi	https://doi.org/10.1016/j.ijheatmasstransfer.2021.122250
dc.identifier.issn	0017-9310
dc.identifier.publicationfirstpage	122250
dc.identifier.publicationlastpage	122265
dc.identifier.publicationtitle	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER	en
dc.identifier.publicationvolume	184
dc.identifier.uri	https://hdl.handle.net/10016/35759
dc.identifier.uxxi	AR/0000029714
dc.language.iso	eng	en
dc.publisher	ELSEVIER BV	en
dc.relation.publisherversion	https://www.sciencedirect.com/science/article/pii/S0017931021013491?via%3Dihub#!	en
dc.rights	© 2021 Elsevier Ltd. All rights reserved.	en
dc.rights	Atribución-NoComercial-SinDerivadas 3.0 España	*
dc.rights.accessRights	embargoed access	en
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/es/	*
dc.subject.eciencia	Ingeniería Industrial	es
dc.subject.other	Particle	en
dc.subject.other	Thermal conductivity	en
dc.subject.other	Thermal energy storage	en
dc.subject.other	Moving packed bed	en
dc.title	Bimodal particle distributions with increased thermal conductivity for solid particles as heat transfer media and storage materials	en
dc.type	research article	*
dc.type.hasVersion	AM	*
dspace.entity.type	Publication