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Entropy 2016, 18(1), 24; doi:10.3390/e18010024

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

German Aerospace Center (DLR), Institute of Solar Research, Linder Höhe, 51170 Köln, Germany
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Author to whom correspondence should be addressed.
Academic Editors: Michel Feidt, Daniel Tondeur, Jean-Noël Jaubert and Romain Privat
Received: 3 November 2015 / Revised: 16 December 2015 / Accepted: 7 January 2016 / Published: 11 January 2016
(This article belongs to the Special Issue Selected Papers from 13th Joint European Thermodynamics Conference)
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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. View Full-Text
Keywords: solar; thermochemical cycle; CSP; water splitting; CO2 splitting; T-S diagram; efficiency; entropy solar; thermochemical cycle; CSP; water splitting; CO2 splitting; T-S diagram; efficiency; entropy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lange, M.; Roeb, M.; Sattler, C.; Pitz-Paal, R. Entropy Analysis of Solar Two-Step Thermochemical Cycles for Water and Carbon Dioxide Splitting. Entropy 2016, 18, 24.

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