Preparation and study of novel mid-to-low-temperature phase-change molten salts  

作　　者：Chenxing REN Yifan WANG Xin HE Chenghang ZHENG Xiang GAO 

机构地区：[1]State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China [2]Institute of Carbon Neutrality,Zhejiang University,Hangzhou 310027,China [3]Baima Lake Laboratory,Zhejiang University,Hangzhou 310051,China

出　　处：《Science China(Technological Sciences)》2025年第2期53-64,共12页中国科学(技术科学英文版)

基　　金：supported by the“Pioneer”and“Leading Goose”R&D Program of Zhejiang(Grant No.2023C03008);the National Natural Science Foundation of China(Grant No.42341208);the Fundamental Research Funds for the Central Universities(Grant No.2022ZJJH02-03);the Major Consulting and Research Project of Zhejiang Research Institute of China Engineering Science and Technology Development Strategy(Grant No.2023ZL0003).

摘　　要：Molten salts is a promising medium for heat storage and heat transfer due to their advantages of low cost,low steam pressure,high energy storage density and wide temperature range.In this paper,a new phase change mixture of molten salts with KNO_(3),NaNO_(3),ZnCl_(2),NaF,Na_(2)CO_(3),NaCl,and MgO as materials has been prepared through a plenty of experiments.The experimental results show that the melting point of some molten salts can be reduced to 202.9℃,and the decomposition temperature can reach 701.3℃.In addition,its thermophysical properties,including specific heat,viscosity and thermal stability,were measured and analyzed.The average specific heat of some molten salts is as high as 2.53 J/(g K),and the average thermal conductivity is as high as 0.77 W/(m K).In the 4-day short-term thermal stability test,the fluctuation of each parameter is minimal,and the overall thermal physical property is relatively stable.Compared with the traditional phase change molten salt,the new hybrid molten salt has a significantly lower melting point,a further improvement in the decomposition temperature,specific heat and other comprehensive thermophysical properties,and a better overall economy,which has important application value in heat transfer and energy storage.

关 键 词：molten salts renewable energy consumption heat transfer and heat storage thermal stability 

分 类 号：TG1[金属学及工艺—金属学]