Assessment of a novel ternary eutectic chloride salt for next generation high-temperature sensible heat storage
Abstract
A novel ternary eutectic salt mixture for high-temperature sensible heat storage, composed of sodium chloride, potassium chloride and magnesium chloride (NaKMg-Cl) was developed based on a phase diagram generated with FactSage(R). The differential scanning calorimetry (DSC) technique was used to experimentally validate the predicted melting point of the ternary eutectic composition, which was measured as 387 degrees C, in good agreement with the prediction. The ternary eutectic was compared to two binary salts formulated based on prediction of the eutectic composition by FactSage, but unfortunately DSC measurements showed that neither binary salt composition was eutectic. Nonetheless, the measured thermo-physical properties of the ternary and the two binary mixtures are compared. Liquid heat capacities of both the ternary and binary salts were determined by using DSC with sapphire as the standard reference. The average heat capacity of the ternary mixture was recorded as 1.18 J g-1 K-1. The mass loss of the molten eutectic salts was studied up to 1000 degrees C using a thermogravimetric analyser in nitrogen, argon and air. The results showed a significant mass loss due to vaporisation in an open system, particularly above 700 degrees C. However, simulation of mass loss in a closed system with anmore »
- Authors:
-
- Australian National Univ., Canberra, ACT (Australia)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
- OSTI Identifier:
- 1440736
- Alternate Identifier(s):
- OSTI ID: 1548188
- Report Number(s):
- NREL/JA-5500-68948
Journal ID: ISSN 0196-8904
- Grant/Contract Number:
- AC36-08GO28308; AC36-08-GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Energy Conversion and Management
- Additional Journal Information:
- Journal Volume: 167; Journal Issue: C; Journal ID: ISSN 0196-8904
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 14 SOLAR ENERGY; 47 OTHER INSTRUMENTATION; high-temperature; sensible heat storage; melting point; heat capacity; mass loss; molten salt
Citation Formats
Mohan, Gowtham, Venkataraman, Mahesh, Gomez-Vidal, Judith, and Coventry, Joe. Assessment of a novel ternary eutectic chloride salt for next generation high-temperature sensible heat storage. United States: N. p., 2018.
Web. doi:10.1016/j.enconman.2018.04.100.
Mohan, Gowtham, Venkataraman, Mahesh, Gomez-Vidal, Judith, & Coventry, Joe. Assessment of a novel ternary eutectic chloride salt for next generation high-temperature sensible heat storage. United States. https://doi.org/10.1016/j.enconman.2018.04.100
Mohan, Gowtham, Venkataraman, Mahesh, Gomez-Vidal, Judith, and Coventry, Joe. Wed .
"Assessment of a novel ternary eutectic chloride salt for next generation high-temperature sensible heat storage". United States. https://doi.org/10.1016/j.enconman.2018.04.100. https://www.osti.gov/servlets/purl/1440736.
@article{osti_1440736,
title = {Assessment of a novel ternary eutectic chloride salt for next generation high-temperature sensible heat storage},
author = {Mohan, Gowtham and Venkataraman, Mahesh and Gomez-Vidal, Judith and Coventry, Joe},
abstractNote = {A novel ternary eutectic salt mixture for high-temperature sensible heat storage, composed of sodium chloride, potassium chloride and magnesium chloride (NaKMg-Cl) was developed based on a phase diagram generated with FactSage(R). The differential scanning calorimetry (DSC) technique was used to experimentally validate the predicted melting point of the ternary eutectic composition, which was measured as 387 degrees C, in good agreement with the prediction. The ternary eutectic was compared to two binary salts formulated based on prediction of the eutectic composition by FactSage, but unfortunately DSC measurements showed that neither binary salt composition was eutectic. Nonetheless, the measured thermo-physical properties of the ternary and the two binary mixtures are compared. Liquid heat capacities of both the ternary and binary salts were determined by using DSC with sapphire as the standard reference. The average heat capacity of the ternary mixture was recorded as 1.18 J g-1 K-1. The mass loss of the molten eutectic salts was studied up to 1000 degrees C using a thermogravimetric analyser in nitrogen, argon and air. The results showed a significant mass loss due to vaporisation in an open system, particularly above 700 degrees C. However, simulation of mass loss in a closed system with an inert cover gas indicates storage temperatures above 700 degrees C may be feasible, and highlights the importance of the design of the storage tank system. In terms of storage material cost, the NaKMg-Cl mixture is approximately 4.5 USD/kWh, which is 60% cheaper than current state-of-the-art nitrate salt mixtures.},
doi = {10.1016/j.enconman.2018.04.100},
journal = {Energy Conversion and Management},
number = C,
volume = 167,
place = {United States},
year = {Wed May 02 00:00:00 EDT 2018},
month = {Wed May 02 00:00:00 EDT 2018}
}
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