化工学报2016，Vol.67Issue(z2)：149-158,10.DOI:10.11949/j.issn.0438-1157.20161393
三水合乙酸钠在相变单元的传热特性及其过冷度改善
Thermal property in phase-change units and improvement for supercoiling of sodium acetate trihydrate
摘要
Abstract
Taking sodium acetate trihydrate (CH3 COONa·3H2 O)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 CH3 COONa·3H2 O.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 Na2 HPO4 ·12H2 O and SiO2 were added to CH3 COONa·3H2 O,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.关键词
相变/三水合乙酸钠/成核/二氧化硅/振动法/搅拌法Key words
phase change/sodium acetate trihydrate/nucleation/silica/vibration/stirring分类
能源科技引用本文复制引用
崔文龙,袁艳平,孙亮亮,曹晓玲,向波..三水合乙酸钠在相变单元的传热特性及其过冷度改善[J].化工学报,2016,67(z2):149-158,10.基金项目
国家自然科学基金面上项目(51378426) （51378426）
建筑环境与能源高效利用四川省青年科技创新研究团队项目(2015TD0015)。@@@@supported by the National Natural Science Foundation of China (51378426) and the Youth Science and Technology Innovation Team of Sichuan Province of Building Environment and Energy Efficiency (2015TD0015) （2015TD0015）
