Development and Characteristics Analysis of Novel Hydrated Salt Composite Adsorbents for Thermochemical Energy Storage

Yihan Wang, Zicheng Zhang, Shuli Liu (), Zhihao Wang and Yongliang Shen
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Yihan Wang: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Zicheng Zhang: Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650032, China
Shuli Liu: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
Zhihao Wang: Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650032, China
Yongliang Shen: School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

Energies, 2023, vol. 16, issue 18, 1-21

Abstract: New composite adsorbents are proposed to further improve the application of thermochemical energy storage technology in buildings. A volcanic is taken as an adsorption substance, which is impregnated in 36.50 wt% and 54.00 wt% saturated MgCl 2 and CaCl 2 solutions to prepare composite adsorbents, which are called composite-MgCl 2 and composite-CaCl 2 , respectively. According to the characterization, the main pore structure of the original volcanic is macropores (>100 nm), and hydrated salts tend to fill them. Compared with zeolite-MgCl 2 , the final water uptake of composite-MgCl 2 and composite-CaCl 2 increased by 0.15 g/g and 0.03 g/g. Meanwhile, the TG-DSC measurement results show that the thermochemical energy storage densities of composite-MgCl 2 and composite-CaCl 2 are 1.02 and 1.56 times that of zeolite-MgCl 2 , which are 642 kJ/kg and 983 kJ/kg, respectively. Moreover, the composition of the thermochemical energy storage densities of the composites is obtained by theoretical calculations, and the theoretically calculated results are close to the measured results. After several cycles, the composites still have high thermochemical energy storage capacity and low energy storage density cost.

Keywords: thermochemical energy storage; hydrated salt composite adsorbent; volcanic; energy storage density; economic analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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