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Development of High Temperature Phase-Change-Material Storages

Laing, Doerte and Bauer, Thomas and Breidenbach, Nils and Hachmann, Bernd and Johnson, Maike (2011) Development of High Temperature Phase-Change-Material Storages. Innostock 2012 - The 12th International Conference on Energy Storage, 16.-18- Mai 2012, Lleida, Spanien.

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Abstract

High-temperature PCM storage is a key component for storing latent heat. This is necessary for efficient energy storage in connection with the two-phase heat transfer fluid water/steam. Due to the low thermal conductivity of the nitrate salts used for high-temperature PCM storage, it is necessary to increase the heat transfer rate to meet the necessary power density demands for specific applications. A design for heat transfer enhancement using radially finned tubes has been developed by DLR and applied in a 700 kWh PCM storage demonstration module. The 700 kWh PCM storage has successfully been tested in a combined storage system for DSG. The operation of this PCM storage module for evaporating water in constant and sliding pressure mode was successfully demonstrated. Three different operation modes regarding flow for discharging the PCM storage have been tested successfully, showing potential for future cost reductions for the complete storage system. Here, either only the recirculation pump or even the complete circulation cycle including the steam drum could be eliminated. Good system operability of the systems was achieved. Furthermore, a new design based on extruded aluminum profiles, aiming at further cost reduction, has been developed by Brökelmann and DLR. Various fin designs have been analyzed with the finite element analysis software ANSYS® and optimized for a better temperature/heat distribution. The final design has been analyzed in a lab-scale PCM storage module. Test results of different operation parameters and thermo-mechanical examinations are shown and compared to theoretical analyses of the new design.

Item URL in elib:https://elib.dlr.de/79654/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Development of High Temperature Phase-Change-Material Storages
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Laing, Doertedoerte.laing (at) dlr.deUNSPECIFIED
Bauer, Thomasthomas.bauer (at) dlr.deUNSPECIFIED
Breidenbach, Nilsnils.breidenbach (at) dlr.deUNSPECIFIED
Hachmann, Berndbernd.hachmann (at) broekelmann.comUNSPECIFIED
Johnson, Maikemaike.johnson (at) dlr.deUNSPECIFIED
Date:May 2011
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermal Energy Storage, Phase Change Material, High Temperature, Heat Transfer Enhancement
Event Title:Innostock 2012 - The 12th International Conference on Energy Storage
Event Location:Lleida, Spanien
Event Type:international Conference
Event Dates:16.-18- Mai 2012
Organizer:GREA Innovació Concurrent, University of Lleida
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Laing, Dörte
Deposited On:18 Dec 2012 17:48
Last Modified:18 Dec 2012 17:48

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