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Oxygen Crossover in Solid-Solid Heat Exchangers for Solar Water and Carbon Dioxide Splitting: A Thermodynamic Analysis

Holzemer-Zerhusen, Philipp and Brendelberger, Stefan and Roeb, Martin and Sattler, Christian (2020) Oxygen Crossover in Solid-Solid Heat Exchangers for Solar Water and Carbon Dioxide Splitting: A Thermodynamic Analysis. Journal of Energy Resources Technology, 143 (7), 071301-1. American Society of Mechanical Engineers (ASME). doi: 10.1115/1.4048772. ISSN 0195-0738.

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Abstract

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.

Item URL in elib:https://elib.dlr.de/137905/
Document Type:Article
Title:Oxygen Crossover in Solid-Solid Heat Exchangers for Solar Water and Carbon Dioxide Splitting: A Thermodynamic Analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Holzemer-Zerhusen, PhilippPhilipp.Holzemer-Zerhusen (at) dlr.deUNSPECIFIED
Brendelberger, StefanStefan.Brendelberger (at) dlr.deUNSPECIFIED
Roeb, MartinMartin.Roeb (at) dlr.deUNSPECIFIED
Sattler, ChristianChristian.Sattler (at) dlr.dehttps://orcid.org/0000-0002-4314-1124
Date:2020
Journal or Publication Title:Journal of Energy Resources Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:143
DOI :10.1115/1.4048772
Page Range:071301-1
Publisher:American Society of Mechanical Engineers (ASME)
ISSN:0195-0738
Status:Published
Keywords:solar chemistry, water splitting, carbon dioxide-splitting, redox cycle, solid-solid heat exchanger, alternative energy sources, hydrogen energy, renewable energy
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
Institute of Solar Research > Solar Chemical Engineering
Deposited By: Roeb, Dr.rer.nat. Martin
Deposited On:23 Nov 2020 12:21
Last Modified:30 Dec 2020 09:55

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