Preparation and characterization of phase change materials for air energy storage

被引：0
|
作者：
Zhang R. [1 ,2 ]
Gu Z. [3 ]
Wang Z. [3 ]
Kang Y. [1 ]
Bai M. [1 ]
机构：
[1] City College, Xi'an Jiaotong University, Xi'an
[2] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
[3] School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an
来源：
Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 07期
关键词：
Capric acid; Expanded graphite; Lauric acid; Nano-ferric oxide(Fe[!sub]2[!/sub]O[!sub]3[!/sub]); Natural cold storage; Shaped phase change material; Thermophysical properties;
D O I：
10.16085/j.issn.1000-6613.2020-1660
中图分类号：
学科分类号：
摘要：
Phase change materials with excellent performance are very important for the application of natural cooling source in building air conditioning. Composite phase change materials CA-LAFe2O3/EG was prepared using the CA-LA eutectic acid as phase change materials, nano-Fe2O3 as additive, and expanded graphite(EG) as matrix materials by chemical dispersion, ultrasonic oscillation and physical adsorption. The properties of the materials were characterized. The results showed that it was better mixing uniformity with CA-LA when the mass fraction of nano-Fe2O3 was 0.8%, which eliminated the supercooling of CA-LA. When the mass fraction of EG was 5.88%, it had a good adsorption on CA-LA Fe2O3(0.8%). FTIR spectrum revealed that there was no chemical reaction in CA-LAFe2O3/EG. The crystallization process showed that adding nano-Fe2O3 particles and EG can accelerate the cooling and crystallization process. The cooling and crystallization time was reduced 39.4% by adding only nano-Fe2O3 particles and 78.2% by adding nano-Fe2O3 and EG, which was conducive to the cold storage process. DSC results indicated that the enthalpy of CA-LAFe2O3(0.8%)/EG (5.88%)/EG was 124.70kJ/kg, which was 3.4% lower than that of pure CA-LA. The oneset melting temperature was 18.66℃ and the oneset crystallization temperature was 19.87℃. Compared with CA-LA the temperature range during melting and crystallization was increased and the thermal conductivity of the material was enhanced. The thermal response of shape stabilized composite phase change materials was affected by the anisotropy of expanded graphite and its thermal response was related to the compression direction. The temperature response speed in the tangential direction of compression was far greater than that in the normal direction. The anisotropy of the materials should be considered in the design of phase change energy storage heat exchangers. © 2021, Chemical Industry Press Co., Ltd. All right reserved.
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页码：3892 / 3899
页数：7
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