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Title: 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 systemmore » 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.« less

Authors:
 [1];  [1];  [2];  [1]
  1. Australian National Univ., Canberra, ACT (Australia)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
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:
Journal Article: 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. doi: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. doi: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},
issn = {0196-8904},
number = C,
volume = 167,
place = {United States},
year = {2018},
month = {5}
}

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