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A eutectic salt high temperature phase change material: Thermal stability and corrosion of SS316 with respect to thermal cycling

Lookup NU author(s): Dr Steven Tay

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Abstract

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 °C. The corrosion rate on stainless steel 316 (SS316) increases linearly up to 350 cycles, and thereafter it stabilizes at 70 mg/cm².

Publication metadata

Author(s): Liu M, Bell S, Segarra M, Tay NHS, Will G, Saman W, Bruno F

Publication type: Article

Publication status: Published

Journal: Solar Energy Materials and Solar Cells

Year: 2017

Volume: 170

Pages: 1-7

Print publication date: 01/10/2017

Online publication date: 24/05/2017

Acceptance date: 18/05/2017

ISSN (print): 0927-0248

Publisher: Elsevier

URL: https://doi.org/10.1016/j.solmat.2017.05.047

DOI: 10.1016/j.solmat.2017.05.047

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