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

CUI Wenlong; YUAN Yanping; SUN Liangliang; CAO Xiaoling; XIANG Bo

doi:10.11949/j.issn.0438-1157.20161393

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

更新时间：2025-11-26

- Thermal property in phase-change units and improvement for supercoiling of sodium acetate trihydrate
- CIESC Journal Issue S2, Pages: 149-158(2016)
- 作者机构：
  
  西南交通大学机械工程学院,四川,成都,610031
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161393
  CLC： K02
- Online First：30 December 2016，
  
  Published：30 December 2016
- 稿件说明：
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CUI Wenlong, YUAN Yanping, SUN Liangliang, et al. Thermal property in phase-change units and improvement for supercoiling of sodium acetate trihydrate[J]. CIESC Journal, 2016, (S2): 149-158.
DOI：

CUI Wenlong, YUAN Yanping, SUN Liangliang, et al. Thermal property in phase-change units and improvement for supercoiling of sodium acetate trihydrate[J]. CIESC Journal, 2016, (S2): 149-158. DOI： 10.11949/j.issn.0438-1157.20161393.

摘要

以三水合乙酸钠（CH3COONa·3H2O）为储热基料，研究了改善其过冷度的几种措施——添加剂、振动法、搅拌法对于其成核过程的影响。以不锈钢单元体模拟日常生活中的蓄热器，进行融化-凝固实验。绘制步冷曲线以及DSC测试，观察其过冷度及蓄、放热特性的变化。结果发现，成核剂Na2HPO4·12H2O以及纳米成核剂SiO2分别将过冷度降至2~3℃以及2.5℃以下。超声振动作用使得CH3COONa·3H2O的过冷度仅为0.7℃左右。引入15 min机械搅拌作用，过冷度降到了2℃以下，并且放热平台持续时间较长。超声振动和机械搅拌的作用还会有效解决CH3COONa·3H2O的相分离现象，同时也保持了较高的蓄热能力。最后，对比分析了各种成核手段的优缺点，在实际应用或者研究中应根据蓄热器的尺寸、经济性等选择合适的办法改善过冷度。

Abstract

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.

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