Sodium Acetate Trihydrate–Crystallization Inhibitor System for Seasonal Latent Heat Storage
Publication: Journal of Energy Engineering
Volume 144, Issue 3
Abstract
Stable supercooling of phase change materials benefits the long-term latent heat storage. Various crystallization inhibitors were adopted to improve the stability of the supercooled sodium acetate trihydrate (SAT) solution, and the supercooling time, cycling stability, and thermal properties were investigated. The supercooling time of the SAT solution was prolonged from 6 h to more than 9 days by acetic acid, ethanol, and glycerin. The supercooled SAT with acetic acid was stable for a long period () during the cycling test, indicating the significant effect of acetic acid in maintaining the cycling stability. Acetic acid acts through inhibiting the crystal growth, limiting the crystal size, and/or reducing the water activity of the supercooled solution. The influence of acetic acid on the heat of fusion, onset temperature, and peak temperature of the SAT system was negligible. The system thermal conductivity was slightly reduced from 0.3698 to by acetic acid, requiring further enhancement strategies. The SAT-water-acetic acid mixture has great potential for energy seasonal storage.
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Acknowledgments
The authors gratefully acknowledge the anonymous reviewers and the editor for their thoughtful suggestions on revising and improving this work. This work was financially supported by the National Natural Science Foundation of China (Project Nos. 51408325 and 51502277), Natural Science Foundation of Ningbo (Project No. 2016A610093), and K.C. Wong Magna Fund in Ningbo University.
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Published In
Journal of Energy Engineering
Volume 144 • Issue 3 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 15, 2017
Accepted: Nov 3, 2017
Published online: Mar 15, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 15, 2018
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