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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. ASME. Energy Sustainability, online. doi: 10.1115/ES2020-1608.

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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 subject 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/138178/
Document Type:Conference or Workshop Item (Speech)
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:June 2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:83631
DOI :10.1115/ES2020-1608
Page Range:V001T13A001
Publisher:ASME
Series Name:Energy Sustainability
Status:Published
Keywords:Carbon dioxide , Cycles , Heat exchangers , Oxygen , Solar energy , Water
Event Title:Energy Sustainability
Event Location:online
Event Type:international Conference
Organizer:American Society of Mechanical Engineers
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: Roeb, Dr.rer.nat. Martin
Deposited On:23 Dec 2020 14:16
Last Modified:23 Dec 2020 14:16

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