Assessment of a novel ternary eutectic chloride salt for next generation high-temperature sensible heat storage
By G. Mohan, Mahesh B. Venkataraman, Judith C. Gomez-Vidal, Joe Coventry. Energy Conversion and Management, 2018
164 citations recorded by the source corpus.
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®. 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 °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 °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 °C. However, simulation of mass loss in a closed system with an inert cover gas indicates storage temperatures above 700 °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.
Subfields: Materials Chemistry, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/f47cb820d0b23e2a4d642003a8f1431778edd016
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Materials Chemistry
In Mechanical Engineering
Citations in the corpus
- Progress in Research and Development of Molten Chloride Salt Technology for Next Generation Concentrated Solar Power Plants (2021, methodology): “9 shows that a eutectic ternary mixture MgCl2/KCl/NaCl has a melting temperature of ~383 C with the eutectic composition of 55wt%/20.5wt%/24.5wt% by modeling with the commercial software FactSageTM and differential scanning calorimetry (DSC) measurements [52].”
- Molten Salts for Sensible Thermal Energy Storage: A Review and an Energy Performance Analysis (2021, background): “Focusing on reducing the levelized cost of electricity (LCOE) for CSP plants, which is currently slightly higher than other renewable alternatives [14], there is presently a strong interest in developing higher temperature power systems (around 700 ◦C) with better efficiency, such as supercritical C”