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Energies 2016, 9(10), 854; doi:10.3390/en9100854

Thermochemical Characterizations of Novel Vermiculite-LiCl Composite Sorbents for Low-Temperature Heat Storage

Institute of Refrigeration and Cryogenics and Key Laboratory of Power Mechanical Engineering, Ministry of Education of The People’s Republic of China, Shanghai Jiao Tong University, Shanghai 200240, China
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Academic Editor: Maurizio Sasso
Received: 27 June 2016 / Revised: 3 October 2016 / Accepted: 10 October 2016 / Published: 22 October 2016
(This article belongs to the Special Issue Renewable Energy Technologies for Small Scale Applications)
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Abstract

To store low-temperature heat below 100 °C, novel composite sorbents were developed by impregnating LiCl into expanded vermiculite (EVM) in this study. Five kinds of composite sorbents were prepared using different salt concentrations, and the optimal sorbent for application was selected by comparing both the sorption characteristics and energy storage density. Textural properties of composite sorbents were obtained by extreme-resolution field emission scanning electron microscopy (ER-SEM) and an automatic mercury porosimeter. After excluding two composite sorbents which would possibly exhibit solution leakage in practical thermal energy storage (TES) system, thermochemical characterizations were implemented through simulative sorption experiments at 30 °C and 60% RH. Analyses of thermogravimetric analysis/differential scanning calorimetry (TGA/DSC) curves indicate that water uptake of EVM/LiCl composite sorbents is divided into three parts: physical adsorption of EVM, chemical adsorption of LiCl crystal, and liquid–gas absorption of LiCl solution. Energy storage potential was evaluated by theoretical calculation based on TGA/DSC curves. Overall, EVMLiCl20 was selected as the optimal composite sorbent with water uptake of 1.41 g/g, mass energy storage density of 1.21 kWh/kg, and volume energy storage density of 171.61 kWh/m3. View Full-Text
Keywords: sorbent; expanded vermiculite (EVM); lithium chloride; solution carryover; thermal energy storage (TES) sorbent; expanded vermiculite (EVM); lithium chloride; solution carryover; thermal energy storage (TES)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, Y.; Wang, R.; Li, T.; Zhao, Y. Thermochemical Characterizations of Novel Vermiculite-LiCl Composite Sorbents for Low-Temperature Heat Storage. Energies 2016, 9, 854.

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