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Sodium nitrate for high temperature latent heat storage

Bauer, Thomas and Dörte, Laing and Ulrike, Kröner and Rainer, Tamme (2009) Sodium nitrate for high temperature latent heat storage. The 11th International Conference on Thermal Energy Storage – Effstock, 14.-17. Juni 2009, Stockholm, Schweden. (Unpublished)

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Official URL: http://www.effstock2009.com

Abstract

In this paper the results of material investigations of sodium nitrate (NaNO3) with a melting temperature of 306 °C as a phase change material (PCM) are presented. The thermal stability was examined by long duration oven tests. In these experiments the nitrite formation was monitored. Although some nitrite formation in the melt was detected, results show that the thermal stability of NaNO3 is sufficient for PCM applications. The compatibility of graphite foil and molten NaNO3 was also examined. Results show that the molten NaNO3 oxidizes graphite. Measurements on thermophysical properties of NaNO3 are also reported. These properties include the thermal diffusivity by the laser flash method and the heat capacity by a heat flux differential scanning calorimeter. Reliable temperature dependent thermophysical values of the density, heat capacity, diffusivity and conductivity are identified. Results show that there is a lack of consistent conductivity and diffusivity data in the solid phase.

Document Type:Conference or Workshop Item (Paper)
Title:Sodium nitrate for high temperature latent heat storage
Authors:
AuthorsInstitution or Email of Authors
Bauer, Thomasthomas.bauer@dlr.de
Dörte, Laingdoerte.laing@dlr.de
Ulrike, Krönerulrike.kroener@dlr.de
Rainer, Tammerainer.tamme@dlr.de
Date:2009
Refereed publication:Yes
In ISI Web of Science:No
Status:Unpublished
Keywords:phase change material, sodium nitrate, thermophysical properties, latent heat, density, heat capactity, thermal diffusivity, thermal conductivity
Event Title:The 11th International Conference on Thermal Energy Storage – Effstock
Event Location:Stockholm, Schweden
Event Type:Conference
Event Dates:14.-17. Juni 2009
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:E SF - Solar research (old)
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Solare Hochtemperatursysteme (old), E - Thermische Energiespeicher (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Thermodynamics > Thermal Process Technology
Deposited By: Dr.phil. Thomas Bauer
Deposited On:11 Nov 2009 10:35
Last Modified:12 Dec 2013 20:40

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