Thermal property in phase-change units and improvement for supercoiling of sodium acetate trihydrate

被引：0

作者：

Cui W. ^{[1
]}

Yuan Y. ^{[1
]}

Sun L. ^{[1
]}

Cao X. ^{[1
]}

Xiang B. ^{[1
]}

机构：

[1] School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, Sichuan

来源：

Huagong Xuebao/CIESC Journal | 2016年 / 67卷

基金：

中国国家自然科学基金;

关键词：

Nucleation; Phase change; Silica; Sodium acetate trihydrate; Stirring; Vibration;

D O I：

10.11949/j.issn.0438-1157.20161393

中图分类号：

学科分类号：

摘要：

Taking sodium acetate trihydrate (CH3COONa·3H2O)as basic material for heat storage, this paper reports that the use of nucleating agents, vibration, and mixing can be as several ways to improve the supercooling properties of CH3COONa·3H2O.Melting-freezing experiments were made in units made of stainless steel, which is used to imitate the heat accumulators in daily life.By cooling curve and DSC test, the change of supercooling and ability to store heat were investigated.As a result, when an optimal amount of Na2HPO4·12H2O and SiO2 were added to CH3COONa·3H2O, the degree of supercooling was low to approximately 2-3℃ or blow 2.5℃.After introducing ultrasonic vibratory, the degree of supercooling can be as low as 0.7℃.What's more, after stirring the melt for 15 min, the degree of supercooling would be under 2℃, and releasing heat for a long time.At the same time, the last two ways, i.e., ultrasonic vibratory and stirring can solve the problem of phase separation.At last, this paper analyzes the merits and demerits of above methods for nucleating.In order to improve supercooling in practical application and research, it is suitable to choose a best method according to the size of accumulators and economy. © All Right Reserved.

引用

页码：149 / 158

页数：9

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