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Assessment and development of molten salt storage and heat transfer fluids for solar thermal power plants and industrial processes.

Breidenbach, Nils and Bauer, Thomas and Laing, Doerte and Tammer, Rainer (2011) Assessment and development of molten salt storage and heat transfer fluids for solar thermal power plants and industrial processes. World Engineers' Convention 2011, Genf, Schweiz.

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Abstract

For solar power plants the use of molten salt as a thermal storage material or heat transfer fluid is one of the key technologies. Due to their very low vapour pressure and comparatively high thermal stability, molten salts are promising heat transfer and storage media. At present, the two-tank molten salt storage is the most developed concept. Commercial examples of two-tank storages and current research developments such as the single-tank thermocline storage with filler material are presented. Nitrate molten salts are the first choice in solar thermal power plants due to several advantages in comparison with other molten salts. However, the binary salt mixture NaNO3-KNO3, which is currently used in commercial storage systems, has some disadvantages that have led to further research. Different known salt mixtures and results of molten quartenary salt investigations carried out at DLR are presented and compared with results in literature. The results of the measurements on liquidus lines on the quaternary system K,Li,Na // NO2,NO3 showed similar results with those found in literature. In addition, stability measurements by thermogravimetry were conducted. These measurements, all in a nitrogen atmosphere, show that the stability of this novel mixture is similar to that of NaNO3.

Document Type:Conference or Workshop Item (Paper)
Title:Assessment and development of molten salt storage and heat transfer fluids for solar thermal power plants and industrial processes.
Authors:
AuthorsInstitution or Email of Authors
Breidenbach, NilsTT-TP
Bauer, ThomasTT-TP
Laing, DoerteTT-TP
Tammer, RainerTT
Date:September 2011
Status:Published
Keywords:molten salt, thermal storage, heat transfer fluid, CSP, nitrate salts
Event Title:World Engineers' Convention 2011
Event Location:Genf, Schweiz
Event Type:international Conference
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E EV - Energy process technology (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 Technical Thermodynamics > Thermal Process Technology
Deposited By: Nils Breidenbach
Deposited On:08 Nov 2011 14:05
Last Modified:08 Nov 2011 14:05

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