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Parametric investigation of a volumetric solar receiver-reactor

Lidor, Alon and Fend, Thomas and Roeb, Martin and Sattler, Christian (2020) Parametric investigation of a volumetric solar receiver-reactor. Solar Energy, 204, pp. 256-269. Elsevier. doi: 10.1016/j.solener.2020.04.045. ISSN 0038-092X.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0038092X20304205?via%3Dihub


Hydrogen production by solar-driven 2-step reduction–oxidation cycles has been successfully demonstrated in recent years. While the demonstrated efficiencies were quite low (up to 5.25% solar-to-fuel efficiency), there is a large potential for much higher efficiencies. This paper presents a detailed parametric investigation of a large scale (>100 kW) volumetric solar receiver-reactor, performed using a finite volume method model. The reactor temperature profile and extent of reduction are investigated by evaluating the effects of heat recovery, sweep gas mass flow, radiation flux and porosity. The current reactor concept is shown to have a temperature gradient across the absorber of 500–700 K, leading to a mean ceria reduction extent of 0.004–0.012, thus limiting the amount of hydrogen that can be generated to the order of several milligrams per cycle or less. It is also shown that heat recovery can reduce the temperature gradient across the absorber to 350 K, thus increasing the hydrogen generation significantly, up to four orders of magnitude higher than with no heat recovery (up to 5.25 g/cycle). The solar heat flux on the receiver can also significantly increase the hydrogen production and reduce the reduction step duration. Thus, the optimization of both design and operation of large volumetric reactors can increase the hydrogen generation rate significantly.

Item URL in elib:https://elib.dlr.de/135158/
Document Type:Article
Title:Parametric investigation of a volumetric solar receiver-reactor
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lidor, AlonAlon.Lidor (at) dlr.deUNSPECIFIED
Fend, ThomasThomas.Fend (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.roeb (at) dlr.dehttps://orcid.org/0000-0002-9813-5135
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:1 July 2020
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.solener.2020.04.045
Page Range:pp. 256-269
Keywords:Solar energy Thermochemical cycles Hydrogen generation Solar fuels
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solar Chemical Engineering
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:09 Oct 2020 10:32
Last Modified:23 Feb 2021 12:20

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