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Entropy Analysis of Solar Two-Step Thermochemical Cycles for Water and Carbon Dioxide Splitting

Lange, Matthias and Roeb, Martin and Sattler, Christian and Pitz-Paal, Robert (2016) Entropy Analysis of Solar Two-Step Thermochemical Cycles for Water and Carbon Dioxide Splitting. Entropy, 18 (24), pp. 1-12. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/e18010024 ISSN 1099-4300

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Official URL: http://www.mdpi.com/1099-4300/18/1/24

Abstract

The present study provides a thermodynamic analysis of solar thermochemical cycles for splitting of H2O or CO2. Such cycles, powered by concentrated solar energy, have the potential to produce fuels in a sustainable way. We extend a previous study on the thermodynamics of water splitting by also taking into account CO2 splitting and the influence of the solar absorption efficiency. Based on this purely thermodynamic approach, efficiency trends are discussed. The comprehensive and vivid representation in T-S diagrams provides researchers in this field with the required theoretical background to improve process development. Furthermore, results about the required entropy change in the used redox materials can be used as a guideline for material developers. The results show that CO2 splitting is advantageous at higher temperature levels, while water splitting is more feasible at lower temperature levels, as it benefits from a great entropy Change during the splitting step.

Item URL in elib:https://elib.dlr.de/101963/
Document Type:Article
Title:Entropy Analysis of Solar Two-Step Thermochemical Cycles for Water and Carbon Dioxide Splitting
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lange, Matthiasmatthias.lange (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.roeb (at) dlr.deUNSPECIFIED
Sattler, Christianchristian.sattler (at) dlr.deUNSPECIFIED
Pitz-Paal, Robertrobert.pitz-paal (at) dlr.deUNSPECIFIED
Date:11 January 2016
Journal or Publication Title:Entropy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:18
DOI :10.3390/e18010024
Page Range:pp. 1-12
Editors:
EditorsEmail
Feidt, MichelUNSPECIFIED
Tondeaur, DanielUNSPECIFIED
Jaubert, Jaen-NoelUNSPECIFIED
Privat, RomainUNSPECIFIED
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1099-4300
Status:Published
Keywords:solar; thermochemical cycle; CSP; water splitting; CO2 splitting; T-S diagram; efficiency; entropy
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Solar Fuels
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solar Fuels (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Solare Verfahrenstechnik
Deposited By: Sattler, Prof. Dr. Christian
Deposited On:12 Jan 2016 13:49
Last Modified:08 Mar 2018 18:24

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