兰州理工大学学报

兰州理工大学学报 ›› 2022, Vol. 48 ›› Issue (1): 20-24.

• 材料科学与工程 • 上一篇    下一篇

MgCl2·6H2O/MgSO4·7H2O复合相变体系的储热性能研究

刘建军*1, 沈梁玉2, 杨效田2, 王彩龙2   

  1. 1.甘肃省集成装配式建筑产业发展有限公司, 甘肃 兰州 730106;
    2.兰州理工大学 材料科学与工程学院 省部共建有色金属先进加工与再利用国家重点实验室, 甘肃 兰州 730050
  • 收稿日期:2021-05-10 出版日期:2022-02-28 发布日期:2022-03-09
  • 通讯作者: 刘建军(1970-),男,甘肃武威人,高级工程师.Email:295357947@qq.com
  • 基金资助:
    甘肃省科技重点项目(1102GKDA049)

Study on heat storage performance of MgCl2·6H2O/MgSO4·7H2O complex phase-change system

LIU Jian-jun1, SHEN Liang-yu2, YANG Xiao-tian2, WANG Cai-long2   

  1. 1. Gansu Integrated Assembly Coustruction Industry Development Co. LTd., Lanzhou 730106;
    2. College of Materials Science and Engineering, State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China
  • Received:2021-05-10 Online:2022-02-28 Published:2022-03-09

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摘要： 水合盐相变储热材料普遍存在的过冷和相分离现象是影响其热稳定性和热储存性能的关键问题.以中低温水合盐相变储热材料MgCl2·6H2O(MCH)为主体材料,MgSO4·7H2O(MSH)为调节剂,采用熔融共混法制备MCH和MSH复合相变储热体系,研究了MSH对复合相变体系的相变焓、相变温度、过冷度及相分离现象的影响.结果表明:适量MSH的构筑的MCH/MSH体系相变储热性能较MCH显著增加,当MSH含量为5%时,体系具有最小的过冷度、对相分离抑制效果最好、储热性能最佳,其初始焓变值可达到330.91 kJ/kg, 经过往复循环后相变焓能够稳定在254.43 kJ/kg,表明所制备MCH/MSH复合体系具有良好的储热性能和循环稳定性.

关键词: 复合相变材料, 储热性能, 过冷度, 相分离, 热循环稳定性

Abstract: The supercooling and phase separation of hydrated salt phase-change heat storage materials are two key issues that affect thermal stability and heat-storage performance of hydrated salt phase change heat storage materials. Using MgCl2·6H2O (MCH) as the main material and MgSO4·7H2O (MSH) as the nucleating agent, the composite phase change system MCH/MSH is prepared by the melt blending method. The effects of MSH on the phase change enthalpy, phase-change temperature, supercooling degree and phase separation phenomenon of composite phase-change materials are studied. The results show that the phase-change heat storage performance of MCH/MSH system constructed with appropriate amount of MSH is significantly higher than that of MCH. The system show the smallest supercooling, the best phase separation inhibition effect and the best heat storage performance when the MSH content is 5%. Its initial enthalpy change value can reach 330.91 kJ/kg, and the stable value can reach 254.43 kJ/kg after the cycle test, showing the prepared MCH/MSH composite material has good heat storage performance and cycle performance.

Key words: composite phase-change material, heat storage, supercooling, the phase separation, thermal cycle stability

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