Thermodynamic insights into n-alkanes phase change materials for thermal energy storage  

作　　者：Huimin Yan Huning Yang Jipeng Luo Nan Yin Zhicheng Tan Quan Shi 

机构地区：[1]Thermochemistry Laboratory,Liaoning Province Key Laboratory of Thermochemistry for Energy and Materials,Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China [2]Beijing Institute of Spacecraft System Engineering,Beijing 100094,China [3]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Chemical Letters》2021年第12期3825-3832,共8页中国化学快报（英文版）

基　　金：the financial support from the National Nature Science Foundation of China (No. 22003065);Liaoning Provincial Natural Science Foundation of China (No. 2019-MS-318);Science and Technology Major Project of Liaoning Province (No. 2019JH1/10300002);the Scientific Instrument Developing Project of the Chinese Academy of Sciences (No. YJKYYQ20190046);Dalian Institute of Chemical Physics (No. DICP I202036);Dalian Outstanding Young Scientific Talent Program (No. 2019RJ10)。

摘　　要：n-Alkanes have been widely used as phase change materials(PCMs) for thermal energy storage applications because of their exceptional phase transition performance, high chemical stability, long term cyclic stability and non-toxicity. However, the thermodynamic properties, especially heat capacity, of n-alkanes have rarely been comprehensively investigated in a wide temperature range, which would be insufficient for design and utilization of n-alkanes-based thermal energy storage techniques. In this study, the thermal properties of n-alkanes(C;H;-C;H;), such as thermal stability, thermal conductivity, phase transition temperature and enthalpy were systematically studied by different thermal analysis and calorimetry methods, and compared with previous results. Thermodynamic property of these n-alkanes was studied in a wide temperature range from 1.9 K to 370 K using a combined relaxation(Physical Property Measurement System, PPMS), differential scanning and adiabatic calorimetry method, and the corresponding thermodynamic functions, such as entropy and enthalpy, were calculated based on the heat capacity curve fitting. Most importantly, the heat capacities and related thermodynamic functions of n-heneicosane and n-docosane were reported for the first time in this work, as far as we know. This research work would provide accurate and reliable thermodynamic properties for further study of n-alkanes-based PCMs for thermal energy storage applications.

关 键 词：N-ALKANES Phase change materials Thermal energy storage Heat capacity Thermodynamic functions PPMS Adiabatic calorimetry 

分 类 号：TB34[一般工业技术—材料科学与工程]