摘要
采用Pitzer-Simonson-Clegg模型对四元体系NaNO3-LiNO3-KNO3-H2O在273-358K的溶解度相图进行预测，模型参数拟合于二元体系NaN03-H20、LiN03．H20、KN03．H20和三元体系NaNO3-LiNO3-KNO3-H2O、NaNO3-KNO3-H2O、LiNO3-KNO3-H2O的水活度、渗透系数及溶解度数据，发现一个四元共晶点，该点组成为5．9％NaNO3、76．2％LiNO3-3H2O和17．9％KN03（质量分数），相变温度为295．6K。通过吸放热行为测试及DSC检测对共晶点组成材料的储热性能进行研究。结果表明：该材料在相变温度附近具有良好的储放热性能，且热焓很大，可作为潜在的室温相变储能材料。
A Pitzer-Simonson-Clegg model was applied to the predict phase diagram of the quaternary system NaNO3-LiNO3-KNO3-H2O from 273 K to 358 K, and the model parameters were fitted to the experimental water activity, osmotic coefficient and solubility of the binary systems NaNO3-H2O, LiNO3-H2O, KNO3-H2O and the ternary systems NaNO3-LiNO3-H20, NaNO3-KNO3-H2O, LiNO3-KNO3-H2O. A quaternary eutectic point consisting of 5.9% NaNO3, 76.2% LiNO3＂3H20 and 17.9% KNO3 was predicted, and the melting temperature is 295.6 K. The exothermal and endothermal behaviors of the predicted phase change material were measured and its DSC measurement was carried out. The experimental results show that the predicted material with larger melting heat has excellent heat storage and release ability, and it is expected to be used as the room temperature phase change material.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2012年第10期2875-2881,共7页
The Chinese Journal of Nonferrous Metals
基金
国家高技术研究发展计划资助项目(2012AA052503)
国家自然科学基金资助项目(J0830415)
湖南省自然科学基金资助项目(11JJ2011)
