摘要
选取了四种不同粘性的羧甲基纤维素钠(CMC-Na),对其进行结构分析,选择速溶高粘羧甲基纤维素钠作为三种不同温度梯度芒硝基相变储能材料的增稠剂,确定CMC-Na的最佳复合比例,有效解决相变储能材料的相分层现象。探究了速溶高粘羧甲基纤维素钠的量对相变材料储能密度、导热性和过冷度性能的影响。试验结果表明:三种不同温度梯度芒硝基相变储能材料优化速溶高粘羧甲基纤维素钠比例分别为1.0%、1.0%、0.5%,制备出相变温度分别为7℃、14℃和22℃的芒硝基相变储能材料,其防止相分层的效果较好。材料的储能密度、导热系数以及过冷度分别为102.3J/g、146.4J/g、162.5J/g、0.839 1 W/(m·K)、0.984 3W/(m·K)、1.011 5 W/(m·K)以及2.3℃、0.5℃、0.8℃,这对提高对芒硝基相变材料的使用寿命具有重要的指导意义。
Selecting four kinds of carboxymethyl cellulose sodium （CMC-Na） with different viscidity properties analyzed them from structure, then choosed the quick-dissolving and high-viscosity CMC-Na as a thickener for three different temperature gradient Glauber’s salt phase change energy storage materials. Determined the best compound ratio of CMC-Na, solved the phase transition energy storage material phase stratification phenomenon effectively. The effects of the amount of instant carboxymethyl cellulose so- dium on the energy storage density, thermal conductivity and undercooling performance of phase change materials were investigated. The results demonstrated that the proportions of CMC-Na were 1.0%,1.0%,0.5%, respectively, three different temperature gra- dient of Glauber’s salt phase change energy storage materials were optimized, the phase transition temperature was 7 ℃,14 ℃ and 22 ℃, respectively, solved the phase stratification phenomenon effectively. The energy storage density, thermal conductivity and undercooling were 102.3 J/g,146.4 J/g,162.5 J/g,0.839 1 W/（m·K）,0.984 3 W/（m·K）,1.011 5 W/（m·K） and 2.3 ℃, 0.5 ℃, 0.8 ℃. It was meaningful to improve the service life of Glauber’s salt phase change material.
作者
李秀丽
铁生年
LI Xiuli;TIE Shengnian(New Energy（Photovoltaic）Industry Research Center,Qinghai University,Xining 810016)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第22期3848-3852,共5页
Materials Reports
基金
青海海西州科技支撑计划项目(174610137100713)
青海省国际合作项目(2014-HZ-820)
关键词
羧甲基纤维素钠
芒硝
不同相变温度
相变储能材料
相分层
carboxymethyl cellulose sodium
Glauber’s salt
different phase change temperature
phase change energy storage materials
phase stratification
