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7. Evaluation of Stratification in Thermal Energy Storages

Author

Sifnaios, Ioannis, Jensen, Adam R., Furbo, Simon, Fan, Jianhua, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, and Kolhe, Mohan Lal, editor

Published
2022
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30. Experimental investigations of multiple heat storage units utilizing supercooling of sodium acetate trihydrate:Stability in application size units

Author

Dannemand, Mark, Englmair, Gerald, Kong, Weiqiang, Furbo, Simon, Dannemand, Mark, Englmair, Gerald, Kong, Weiqiang, and Furbo, Simon

Abstract

Stable supercooling of sodium acetate trihydrate (SAT) composites can be used to store heat over long periods. When the melted SAT is supercooled and in temperature equilibrium with the ambient, the latent heat of fusion is essentially stored without further heat loss. The main limitation of this technology is that the supercooled SAT may crystalize spontaneously and release the stored heat before desired if the storage design does not allow for the principle to work. These investigations elucidate the effects of charge and discharge temperatures and durations on the stability of the supercooling in storage units designed for domestic hot water application. A test rig with 10 identical heat storage units with water and 35 kg sodium acetate trihydrate composite was set up. Multiple heating and cooling cycles were carried out with charge temperatures between 84 °C and 94 °C for various durations and with discharge temperatures from 10 °C to 35 °C. The investigations showed that charging the storage units with an inlet temperature of 89 or 92 °C resulted in the highest occurrences of stable supercooling. Discharging with inlet temperatures of 10 °C resulted in higher occurrence of spontaneous solidification during discharge compared to higher inlet temperatures. There was a large deviation in how each tank performed. The best performing tank achieved stable supercooling in 87 % of the test cycles and the worst performing tank achieved stable supercooling in 30 % of the test cycles.

Published
2024

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