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Assembly and attachment methods for extended aluminum fins onto steel tubes for high temperature latent heat storage units

Johnson, Maike and Hübner, Stefan and Braun, Markus and Martin, Claudia and Fiß, Michael and Hachmann, Bernd and Schönberger, Manfred and Eck, Markus (2018) Assembly and attachment methods for extended aluminum fins onto steel tubes for high temperature latent heat storage units. Applied Thermal Engineering. Elsevier. DOI: 10.1016/j.applthermaleng.2018.08.035 ISSN 1359-4311

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Official URL: https://doi.org/10.1016/j.applthermaleng.2018.08.035


High temperature latent heat storages are being developed for both concentrating solar thermal power applications as well as integration in industrial processes. One of the concepts being developed is an extended finned-tube in a shell-and-tube assembly. This concept can be used at high pressures for steam applications and be built at a large scale. The design of the extended fins allowing for independent thermal expansion of the steel tubes and the aluminum fins with a physically possible assembly has not thus far been optimized. Due to the large fin surfaces necessary for storing large amounts of heat, conventional finned-tube assemblies have to date not been applicable for thermal energy storage systems. Designs using spring steel clips on axial fins have been proven, using conservatively high numbers of clips. In this paper, various fin and tube diameters with spring steel clips as well as other mounting methods are compared. Experiments were conducted to analyze the mechanical strength of the assembly; these are described and the results discussed. In addition, two assembly methods were tested using the same fin geometry and testing environment, allowing for a thermodynamic comparison of the assemblies. The tests have shown that while the steel clips allow for the best heat transfer, the crimping method has a higher bond strength. These results can be used for reducing costs and optimizing design of high temperature latent heat storages.

Item URL in elib:https://elib.dlr.de/121396/
Document Type:Article
Title:Assembly and attachment methods for extended aluminum fins onto steel tubes for high temperature latent heat storage units
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Johnson, Maikemaike.johnson (at) dlr.deUNSPECIFIED
Hübner, StefanLinde AGUNSPECIFIED
Braun, Markusmar.braun (at) dlr.deUNSPECIFIED
Martin, Claudiaclaudia.martin (at) dlr.deUNSPECIFIED
Fiß, Michaelmichael.fiss (at) dlr.deUNSPECIFIED
Hachmann, Berndbernd.hachmann (at) broekelmann.comUNSPECIFIED
Schönberger, ManfredLinde AGUNSPECIFIED
Eck, MarkusUniversity of Applied Science OsnabrückUNSPECIFIED
Date:21 August 2018
Journal or Publication Title:Applied Thermal Engineering
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.applthermaleng.2018.08.035
Keywords:extended fin, PCM, latent heat, assembly method, clip, crimp
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Johnson, Maike
Deposited On:07 Sep 2018 14:07
Last Modified:21 Aug 2020 03:00

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