Oxygen Crossover in Solid-Solid Heat Exchangers for Solar Water and Carbon Dioxide Splitting: A Thermodynamic Analysis
| Autor: | Philipp Holzemer-Zerhusen, Martin Roeb, Stefan Brendelberger, Christian Sattler |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
redox cycle
Materials science Heat exchangers Crossover Energy Engineering and Power Technology chemistry.chemical_element Thermodynamics 02 engineering and technology Sensible heat water splitting Oxygen Redox Solar water alternative energy sources chemistry.chemical_compound Solar energy carbon dioxide-splitting Geochemistry and Petrology solid-solid heat exchanger 0502 economics and business Heat exchanger solar chemistry hydrogen energy 050207 economics Energy demand business.industry Renewable Energy Sustainability and the Environment Mechanical Engineering 05 social sciences Water 021001 nanoscience & nanotechnology renewable energy Fuel Technology chemistry Carbon dioxide Cycles business 0210 nano-technology |
| DOI: | 10.1115/es2020-1608 |
| Popis: | In solar thermochemical redox cycles for H2O/CO2-splitting, a large portion of the overall energy demand of the system is associated with heating the redox material from the oxidation temperature to the reduction temperature. Hence, an important measure to improve the efficiency is recuperation of sensible heat stored in the redox material. A solid–solid heat exchanger can be subjected to undesirable oxygen crossover, which decreases the oxygen uptake capacity of the redox material and consequently the system efficiency. We investigate the extent of this crossover in ceria-based cycles, to identify, under which conditions a heat exchanger that allows oxygen crossover can improve the system efficiency. In a thermodynamic analysis, we calculate the amount of transferred oxygen as a function of the heat exchanger efficiency and show the system efficiency of such a concept. A second law analysis is applied to the model to check the feasibility of calculated points of operation. For the investigated parameter set, the heat exchanger design improves the system efficiency by a factor of up to 2.1. |
| Databáze: | OpenAIRE |
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