相变材料三水醋酸钠储热性能实验研究

Experimental study on heat storage performance of sodium acetate trihydrate as phase change material

以三水醋酸钠(CH3COONa.3H2O)为相变储热基材,添加各种不同成核剂和增稠剂,比较它们的效果,寻求储热性能优越的组合配方。实验表明:对于同一成核剂,随添加量的增加,CH3COONa.3H2O的过冷度有增大的倾向。在10 g CH3COONa.3H2O中添加0.05 g的Na2HPO4.12H2O,抑制过冷的效果最好,同时配合0.3 g羧甲基纤维素(CMC)使用,CH3COONa.3H2O的过冷性能得到进一步改善,过冷度可降低至2.015℃,并且还能有效地防止相分层。同时,还发现CH3COONa.3H2O体系的恒温温度为65℃比较合适。

Sodium acetate trihydrate（CH3COONa·3H2O） was used as a substrate material of phase change heat storage by adding various nucleating agents and thickeners to compare its effect so that to find out the best combination for superior heat storage performance.The experiments show that for the same type of nucleating agent,the degree of supercooling of CH3COONa·3H2O has an increasing tendency with the increasing of its adding amount.The effect of inhibiting supercooling is the best when adding 0.05 g Na2HPO4·12H2O in 10 g CH3COONa·3H2O.The supercooling performance of CH3COONa·3H2O can be further improved with 0.3 g carboxymethyl cellulose（CMC）,and the degree of supercooling can be reduced to 2.015 ℃.It can effectively prevent phase stratification.The experiment also shows that 65 ℃ is suitable as the constant temperature of CH3COONa·3H2O system.