相变储热材料Na_2SO_4·10H_2O的过冷和相分离研究  

Review on Supercooling and Phase Separation Occurring of Na_2SO_4·10H_2O

作　　者：刘欣[1] 高学农[1] 方玉堂[1] 

机构地区：[1]华南理工大学 传热强化与过程节能教育部重点实验室,广东广州510641

出　　处：《节能技术》2012年第6期499-503,共5页Energy Conservation Technology

基　　金：国家自然科学基金(20976056)

摘　　要：Na2SO4.10H2O具有较高的相变潜热、良好的导热性能以及合适的相变温度,是比较理想的相变储热材料,具有广阔的应用前景。Na2SO4.10H2O存在过冷和相分离两个致命点亟需解决,有效克服过冷和相分离现象将大大提高无机水合盐的储热性能,延长使用寿命。本文对前人关于过冷和相分离现象的解决方案进行综述,在此基础上提出新的有效解决方案。Na2SO4·10H2O has been widely used in many aspects as the phase change material,particularly for its ability to provide a high energy storage density and good thermal conductiivity,as well as for its characteristics to store heat at a constant temperature corresponding to the phase transition temperature of the heat storange substance.However,some problems have occured when Na2SO4·10H2O was used as phase change material in the latent heat storage applications,which would weaken the longevity and the thermophysical property of Na2SO4·10H2O.One of the problem is incongruent melting which causes phase separation,and the other is supercooling because of its weak nucleation properties.In this paper,ways on solving the supercooling and phase separation occurring were reviewed,a new effective solution was also mentioned.

关 键 词：NA2SO4 10H2O 过冷 相分离 相变储热材料 

分 类 号：TK02[动力工程及工程热物理]