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Perspectives of advanced thermal management in solar thermochemical syngas production using a counter-flow solid-solid heat exchanger

Falter, Christoph and Sizmann, Andeas and Pitz-Paal, Robert (2017) Perspectives of advanced thermal management in solar thermochemical syngas production using a counter-flow solid-solid heat exchanger. In: AIP Conference Proceedings, 1850 (1), p. 100005. SOLARPACES 2016: International Conference on Concentrating Solar Power and Chemical Energy Systems, 11–14 October 2016, Abu Dhabi. DOI: https://doi.org/10.1063/1.4984462

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Abstract

A modular reactor model is presented for the description of solar thermochemical syngas production involving counter-flow heat exchangers that recuperate heat from the solid phase. The development of the model is described including heat diffusion within the reactive material as it travels through the heat exchanger, which was previously identified to be a possibly limiting factor in heat exchanger design. Heat transfer within the reactive medium is described by conduction and radiation, where the former is modeled with the three-resistor model and the latter with the Rosseland diffusion approximation. The applicability of the model is shown by the analysis of heat exchanger efficiency for different material thicknesses and porosities in a system with 8 chambers and oxidation and reduction temperatures of 1000 K and 1800 K, respectively. Heat exchanger efficiency is found to rise strongly for a reduction of material thickness, as the element mass is reduced and a larger part of the elements takes part in the heat exchange process. An increase of porosity enhances radiation heat exchange but deteriorates conduction. The overall heat exchange in the material is improved for high temperatures in the heat exchanger, as radiation dominates the energy transfer. The model is shown to be a valuable tool for the development and analysis of solar thermochemical reactor concepts involving heat exchange from the solid phase.

Item URL in elib:https://elib.dlr.de/116897/
Document Type:Conference or Workshop Item (Speech)
Title:Perspectives of advanced thermal management in solar thermochemical syngas production using a counter-flow solid-solid heat exchanger
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Falter, ChristophBauhaus Luftfahrt e.V., Willy-Messerschmitt-Str. 1, Taufkirchen 82024, GermanyUNSPECIFIED
Sizmann, AndeasAndreas.Sizmann (at) bauhaus-luftfahrt.netUNSPECIFIED
Pitz-Paal, RobertRobert.Pitz-Paal (at) dlr.dehttps://orcid.org/0000-0002-3542-3391
Date:2017
Journal or Publication Title:AIP Conference Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:1850
DOI :https://doi.org/10.1063/1.4984462
Page Range:p. 100005
Status:Published
Keywords:Solar thermochemical fuel production
Event Title:SOLARPACES 2016: International Conference on Concentrating Solar Power and Chemical Energy Systems
Event Location:Abu Dhabi
Event Type:international Conference
Event Dates:11–14 October 2016
Organizer:SolarPACES
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
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research
Deposited By: Pitz-Paal, Robert
Deposited On:19 Dec 2017 14:47
Last Modified:19 Dec 2017 14:47

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