Hydrophilic expanded graphite-magnesium nitrate hexahydrate composite phase change materials: Understanding the effect of hydrophilic modification on thermophysical properties

被引:33
作者
Zhang, Yue [1 ,2 ,3 ]
Sun, Jinhe [1 ,2 ,4 ]
Ma, Guixiang [1 ,2 ,3 ]
Wang, Zhao [1 ,2 ,3 ]
Xie, Shaolei [1 ,2 ]
Jing, Yan [1 ,2 ]
Jia, Yongzhong [1 ,2 ]
机构
[1] Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sa, Xining 810008, Qinghai, Peoples R China
[2] Qinghai Engn & Technol Res Ctr Comprehens Utiliza, Xining 810008, Qinghai, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[4] Qinghai Salt Chem Prod Supervis & Inspect Ctr, Geermu 816099, Peoples R China
基金
中国国家自然科学基金;
关键词
expanded graphite; hydrophilic; magnesium nitrate hexahydrate; phase change material; thermal energy storage; THERMAL-ENERGY STORAGE; LATENT-HEAT STORAGE; STEARIC-ACID; PERFORMANCE; CONDUCTIVITY; PREPARE; MIXTURE; SALT;
D O I
10.1002/er.4336
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Expanded graphite (EG) has shown excellent performances in compression resilience, thermal conductivity, and adsorption ability. EG can adsorb liquid phase change materials (PCMs) mainly because of capillary action; however, EG is hydrophobic, which makes it less compatible with hydrated salts. Herein, hydrophilic EG (HEG) was prepared with Triton X-100 (TX-100) as surface modifier. The HEG-magnesium nitrate hexahydrate (HEG-MNH) composite as a PCM was investigated for thermal energy storage (TES) to understand the effect of hydrophilic modification on thermophysical properties. The powder-state HEG is added into MNH to prepare HEG-MNH composite PCM, which contains 1.71 wt% of TX-100, 7.29 wt% of EG, and 91.00 wt% of MNH by control variable method. The melting point and latent heat of HEG-MNH composite PCM were 89.05 degrees C and 137.28 J/g, respectively. The endothermic enthalpy change of HEG-MNH composite PCM only decreased by 0.90%, along with the exothermic values of HEG-MNH composite that increased by 3.80% after 100 cycles. The thermal conductivity is higher 5.17 times than that of the pure MNH. Our work suggests that the HEG-MNH composite PCM has a great potential to be used as a PCM for TES.
引用
收藏
页码:1121 / 1132
页数:12
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