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Heat transfer in a directly irradiated ceria particle bed under vacuum conditions

Grobbel, Johannes and Brendelberger, Stefan and Sattler, Christian and Pitz-Paal, Robert (2017) Heat transfer in a directly irradiated ceria particle bed under vacuum conditions. Solar Energy, 158, pp. 737-745. Elsevier. DOI: 10.1016/j.solener.2017.10.022 ISSN 0038-092X

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Official URL: http://www.sciencedirect.com/science/article/pii/S0038092X17308897?via%3Dihub

Abstract

Vacuum particle receivers have been proposed recently for the reduction of redox material in solar thermochemical redox cycles. To assess the performance of these receivers, it is essential to describe the heat transfer in particle beds correctly. A widely used model for effective thermal bed conductivity is the one developed by Zehner, Bauer and Schlünder, which was derived for the steady state case without interstitial gas flow. In this study it was investigated if the model is also applicable for suddenly irradiated ceria particle beds in a typical solar vacuum receiver environment. Therefore a particle bed of ceria was irradiated with a solar simulator under vacuum conditions to peak temperatures above 1300°C. Within the bed, temperatures were measured at different locations for various pressures between 25 Pa and ambient conditions. The experimental results were compared to heat transfer simulations in ANSYS Workbench incorporating the aforementioned bed conductivity model. A good agreement between experiment and simulation was found and the model was considered applicable.

Item URL in elib:https://elib.dlr.de/114957/
Document Type:Article
Title:Heat transfer in a directly irradiated ceria particle bed under vacuum conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Grobbel, JohannesJohannes.Grobbel (at) dlr.deUNSPECIFIED
Brendelberger, StefanStefan.Brendelberger (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Pitz-Paal, RobertRobert.Pitz-Paal (at) dlr.dehttps://orcid.org/0000-0002-3542-3391
Date:6 October 2017
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:158
DOI :10.1016/j.solener.2017.10.022
Page Range:pp. 737-745
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Particle bed Heat transfer Redox cycle Vacuum Thermal conductivity Ceria Zehner-Bauer-Schlünder
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Jülich , Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:03 Nov 2017 11:34
Last Modified:03 Nov 2017 11:34

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