Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 170, Issue -, Pages 1-7Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2017.05.047
Keywords
Phase change material; Thermal storage; Thermal stability; Dynamic gravimetric analysis; Corrosion; Containment material
Funding
- Australian Government, through Australian Renewable Energy Agency (ARENA)
- South Australian Department of State Development through Premier's Research Industry Fund International Research Grant Program [IRGP 33]
- European Union's Seventh Framework Programme (INNOSTORAGE) [PIRSES-GA-2013-610692]
- Spanish Government (MINECO/FEDER) [ENE2015-64117-05-2-R]
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Thermal energy storage (TES) is a critical component in a concentrated solar power (CSP) plant since it is able to provide dispatchability and increase the capacity factor of the plant. Recently the Brayton power cycle using supercritical carbon dioxide (s-CO2) has attracted considerable attention as it allows a higher thermal to electric power conversion efficiency compared to the conventional Rankine cycle using subcritical steam. However, no commercial TES has yet been developed for integration with a s-CO2 based plant. One reason is the lack of a suitable storage material. This work explores the use of a eutectic NaCl-Na2CO3 salt as a reliable high temperature phase change material (PCM). The PCM has been thermally cycled up to 1000 times. Its thermo-physical properties have been measured before and after it has been subjected to the thermal cycling and its corrosion behavior has been investigated. This eutectic salt shows good thermal stability without degradation after cycling 1000 times between 600 and 650 degrees C. The corrosion rate on stainless steel 316 (SS316) increases linearly up to 350 cycles, and thereafter it stabilizes at 70 mg/cm(2).
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