Performance test and numerical study of salt hydrate-based thermochemical heat storage materials at middle-low temperature

被引：0
作者：
Li W. [1 ]
Wang Q. [1 ]
Zeng M. [1 ]
机构：
[1] Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 05期
关键词：
Composite sorbent; Cycle stability; Energy storage density; Heat transfer; Kinetics; Salt-hydrate; Thermochemical heat storage;
D O I：
10.11949/0438-1157.20201484
中图分类号：
学科分类号：
摘要：
Using hydrated salt K2CO3•1.5H2O and expanded graphite (EG) as chemical heat storage materials and porous matrix respectively, a composite heat storage adsorbent K2CO3@EG was developed. The desorption, adsorption performance and cycle stability of the composite sorbent and pure salt without EG-doping were compared and analyzed. The results show that the desorption temperature of the composite adsorbent is reduced, and the adsorption kinetics of adsorbate is obviously improved, which can effectively avoid deliquescence. After fifteen consecutive desorption-hydration cycle experiments, the heat storage density of pure salt and composite adsorbent decreased by 27.6% and 10.9%, respectively. In addition, the numerical results of the thermal storage unit preliminarily verify the feasibility of the thermal storage system. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：2763 / 2772
页数：9
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