Supercooling Suppression and Thermal Conductivity Enhancement of Na2HPO4 center dot 12H(2)O/Expanded Vermiculite Form-Stable Composite Phase Change Materials with Alumina for Heat Storage

ISL OpenIR

	Supercooling Suppression and Thermal Conductivity Enhancement of Na2HPO4 center dot 12H(2)O/Expanded Vermiculite Form-Stable Composite Phase Change Materials with Alumina for Heat Storage
	Deng, Yong 1; Li, Jinhong 1; Deng, Yanxi 1; Nian, Hongen 2,3; Jiang, Hua 4
	2018-05-01
发表期刊	ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷号	6 期号:5 页码:6792-6801
关键词	Phase Change Material Expanded Vermiculite Alumina Supercooling Suppression Thermal Conductivity Enhancement
摘要	In the heat storage applications, Na2HPO4 center dot 12H(2)O phase change materials (PCM) show significant defects including form instability, high supercooling degree and low thermal conductivity. Aiming at these drawbacks, the Na2HPO4 center dot 12H(2)O-alumina/eipanded vermiculite (EVM) form-stable composite phase change materials (NEA fs-CPCMs) with supercooling suppression and heat transfer enhancement were prepared. The favorable wettability of NEA fs-CPCMs was beneficial to their form-stabilization (encapsulation mass fractions above 59.7 wt %). The supercooling degree of NE5.3 was reduced to 1.4 degrees C after adding 5.3 wt % alumina as the nucleating agent (decreased by 90%). The surface effects of EVM and alumina and high wettability of PCM-alumina were responsible for the supercooling suppression of PCM. Large specific surface area of EVM could provide nucleation sites for crystallization of PCM. The surface electronegativity of alumina increased the affinity ability and diffusion rate of ions, thus effectively increasing the probability of nucleation. The heat transfer of NEA fs-CPCMs was significantly enhanced by the alumina as the thermal conductivity enhancement filler. The thermal conductivity of NE5.3 reached 0.418 W/(m K). Thermal energy storage behavior analysis indicated that the NEA fs-CPCMs showed large heat storage capacity (melting process: 97-151 J/g; solidification process: 60-89 J/g). The thermal reliability of NEA fs-CPCMs was effectively improved by coated paraffin.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6715
专题	中国科学院青海盐湖研究所
通讯作者	Li, Jinhong; Deng, Yanxi
作者单位	1.China Univ Geosci, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sa, Xining 810008, Peoples R China 3.Key Lab Salt Lake Resources Chem Qinghai Prov, Xining 810008, Peoples R China 4.Qinghai Univ, Xining 810016, Peoples R China
推荐引用方式 GB/T 7714	Deng, Yong,Li, Jinhong,Deng, Yanxi,et al. Supercooling Suppression and Thermal Conductivity Enhancement of Na2HPO4 center dot 12H(2)O/Expanded Vermiculite Form-Stable Composite Phase Change Materials with Alumina for Heat Storage[J]. ACS SUSTAINABLE CHEMISTRY & ENGINEERING,2018,6(5):6792-6801.
APA	Deng, Yong,Li, Jinhong,Deng, Yanxi,Nian, Hongen,&Jiang, Hua.(2018).Supercooling Suppression and Thermal Conductivity Enhancement of Na2HPO4 center dot 12H(2)O/Expanded Vermiculite Form-Stable Composite Phase Change Materials with Alumina for Heat Storage.ACS SUSTAINABLE CHEMISTRY & ENGINEERING,6(5),6792-6801.
MLA	Deng, Yong,et al."Supercooling Suppression and Thermal Conductivity Enhancement of Na2HPO4 center dot 12H(2)O/Expanded Vermiculite Form-Stable Composite Phase Change Materials with Alumina for Heat Storage".ACS SUSTAINABLE CHEMISTRY & ENGINEERING 6.5(2018):6792-6801.