Novel Na2SO4-NaCl-ceramic composites as high temperature phase change materials for solar thermal power plants (Part I)

Novel Na2SO4-NaCl-ceramic composites as high temperature phase change materials for solar thermal... The eutectic Na2SO4-NaCl salt was investigated as a novel high temperature phase change material for solar thermal energy storage due to its low cost and melting point (626.0°C) interested. The measured melting point and heat of fusion of the eutectic salt are 625.3°C and 263.3J/g, which are in agreement with their theoretical values. The eutectic salt shows good thermal stability after 100 melting-freezing thermal cycles in the range of 550–680°C in air. Three types of the eutectic Na2SO4-NaCl-ceramic composites have been designed and evaluated to address the salt’ corrosion issues with containment materials. Results show that eutectic Na2SO4-NaCl/both α-alumina and mullite composites with a mass ratio of salt to ceramics of 1:1 (wt%) have good thermal stability without cracking as well as with weight losses of 0.50% and 0.74% and the decrease of latent heat by 1% and 2% respectively after 20 thermal cycles, where no phase separation and chemical reaction occur. Their measured melting temperature and latent heat are consistent with their theoretical values. Addition of α-alumina and mullite to the eutectic Na2SO4-NaCl salt can reduce the eutectic Na2SO4-NaCl salt’ supercooling. In contrast, the sample of the Na2SO4-NaCl/diatomite composite cracked after the cycles. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Solar Energy Materials and Solar Cells Elsevier

Novel Na2SO4-NaCl-ceramic composites as high temperature phase change materials for solar thermal power plants (Part I)

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0927-0248
D.O.I.
10.1016/j.solmat.2017.12.034
Publisher site
See Article on Publisher Site

Abstract

The eutectic Na2SO4-NaCl salt was investigated as a novel high temperature phase change material for solar thermal energy storage due to its low cost and melting point (626.0°C) interested. The measured melting point and heat of fusion of the eutectic salt are 625.3°C and 263.3J/g, which are in agreement with their theoretical values. The eutectic salt shows good thermal stability after 100 melting-freezing thermal cycles in the range of 550–680°C in air. Three types of the eutectic Na2SO4-NaCl-ceramic composites have been designed and evaluated to address the salt’ corrosion issues with containment materials. Results show that eutectic Na2SO4-NaCl/both α-alumina and mullite composites with a mass ratio of salt to ceramics of 1:1 (wt%) have good thermal stability without cracking as well as with weight losses of 0.50% and 0.74% and the decrease of latent heat by 1% and 2% respectively after 20 thermal cycles, where no phase separation and chemical reaction occur. Their measured melting temperature and latent heat are consistent with their theoretical values. Addition of α-alumina and mullite to the eutectic Na2SO4-NaCl salt can reduce the eutectic Na2SO4-NaCl salt’ supercooling. In contrast, the sample of the Na2SO4-NaCl/diatomite composite cracked after the cycles.

Journal

Solar Energy Materials and Solar CellsElsevier

Published: May 1, 2018

References

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