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Material aspects of Solar Salt for sensible heat storage

Bauer, Thomas and Pfleger, Nicole and Breidenbach, Nils and Eck, Markus and Laing, Doerte and Kaesche, Stefanie (2013) Material aspects of Solar Salt for sensible heat storage. Applied Energy, 111, pp. 1114-1119. Elsevier. DOI: 10.1016/j.apenergy.2013.04.072 ISSN 0306-2619

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For sensible thermal energy storage (TES) in liquids in the temperature range from 250 C to 550 C, a mixture of 60 wt% sodium nitrate (NaNO3) and 40 wt% potassium nitrate (KNO3), known as Solar Salt, is commonly utilized. At the time of writing, TES technology for concentrating solar power is the major application. Although commercial systems have been demonstrated, there are still several material aspects to be investigated. In this paper we address thermophysical properties and metallic corrosion, as well as thermal decomposition processes. The paper reviews temperature dependent thermophysical properties of Solar Salt. Deviations among the authors of these properties were small for the density (±1.5%), medium for the heat capacity (±7%) and large for thermal diffusivity and thermal conductivity values (±15%). The paper gives an overview of the various aspects of steel corrosion in molten alkali nitrate salts. From literature data, four steel type categories mainly depending on the temperature range are defined. The paper presents thermal stability examinations of Solar Salt and NaNO3 by isothermal labscale tests and thermal analysis measurements. Salt analysis in the isothermal test showed a steadily increasing oxide level at a constant nitrite to nitrate ratio. The result shows that there are kinetic differences in the first decomposition process with nitrite formation and the second decomposition process with oxide formation. The impact of the partial oxygen pressure on the decomposition temperature was examined by thermogravimetric measurements. Measurements show an improved stability limit for higher partial oxygen pressures.

Item URL in elib:https://elib.dlr.de/84213/
Document Type:Article
Title:Material aspects of Solar Salt for sensible heat storage
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bauer, Thomasthomas.bauer (at) dlr.deUNSPECIFIED
Pfleger, Nicolenicole.pfleger (at) dlr.deUNSPECIFIED
Breidenbach, Nilsnils.breidenbach (at) dlr.deUNSPECIFIED
Eck, Markusmarkus.eck (at) dlr.deUNSPECIFIED
Laing, Doertedoerte.laing (at) dlr.deUNSPECIFIED
Kaesche, Stefaniestefanie.kaesche (at) mpa.uni-stuttgart.deUNSPECIFIED
Date:20 May 2013
Journal or Publication Title:Applied Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.apenergy.2013.04.072
Page Range:pp. 1114-1119
Keywords:Molten salt Corrosion Nitrite formation Oxide formation Thermophysical properties
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: Köln-Porz
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bauer, Dr.phil. Thomas
Deposited On:18 Sep 2013 13:27
Last Modified:06 Sep 2019 15:21

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