Abstract
Inorganic salt hydrates that undergo reversible solid–gas thermochemical reactions can be used for thermal energy storage in buildings. However, characterization of the reaction enthalpy (energy storage capacity) has been a challenge owing to their microstructure and hygrothermal stability, which results in variations between literature data for the same salt and underperforming theoretical predictions. To address this, a parametric study of the simultaneous thermal analysis variables is performed to characterize phase transitions in six thermochemical materials (TCMs). This yields a set of standard experimental conditions for each TCM that maximizes energy density, while establishing design rules for salt mixtures.
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All data generated and analyzed during this study are included in the manuscript and electronic supplementary information.
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Acknowledgments
This work was performed in part at the Georgia Tech Institute for Electronics and Nanotechnology, a member of the National Nanotechnology Coordinated Infrastructure (NNCI), which is supported by the National Science Foundation (Grant ECCS-2025462). EB gratefully acknowledges financial support from the National Science Foundation Graduate Research Fellowship and the President’s Fellowship at Georgia Tech. AKM acknowledges the Woodruff School of Mechanical Engineering for startup funds to perform this work. The authors also thank Dr. David Tavakoli for assistance with XRD measurements and Mr. Greg Blubaugh for calibrating the DSC.
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Barbosa, E., Menon, A.K. Thermodynamic and kinetic characterization of salt hydrates for thermochemical energy storage. MRS Communications 12, 678–685 (2022). https://doi.org/10.1557/s43579-022-00264-8
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DOI: https://doi.org/10.1557/s43579-022-00264-8