Journal
SOLARPACES 2018: INTERNATIONAL CONFERENCE ON CONCENTRATING SOLAR POWER AND CHEMICAL ENERGY SYSTEMS
Volume 2126, Issue -, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5117601
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- U.S. Department of Energy (DOE) [DE-AC36-08GO28308]
- DOE Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office
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Third-generation (Gen3) concentrating solar power (CSP) technologies require a thermally stable and inexpensive fluid to be used for heat transfer and thermal energy storage. For Gen3 CSP plants, a molten salt composed of MgCl2 - KCl- NaCl is a new candidate, but it is familiar enough to plants with existing molten-salt systems. To determine the best composition for the heat-transfer fluid, we mixed nine different ratios of the salts, dry/purified them following strict protocols, and tested them with a differential scanning calorimeter and a thermogravimetric analyzer. Our results showed that the lowest melting and solidification temperature of 385 degrees C +/- 1 degrees C was determined for the eutectic composition 44.7 MgCl2- 25.8 KCl - 29.4 NaCl (mol.%). We determined that improper handling and preparation of the salt mixture highly affects its thermal properties because of moisture absorption. Preparation standards-particularly the dehydration of hydrous MgCl2-merit further development.
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