熔盐相变蓄热材料热物性测试新方法的研究

项目名称： 熔盐相变蓄热材料热物性测试新方法的研究

项目编号： No.50876116

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 武器工业

项目作者： 周孑民

作者单位： 中南大学

项目金额： 35万元

中文摘要： 相变蓄热技术可解决能量供求在时间和空间上不匹配的矛盾，是提高能源利用率的有效手段。熔盐相变材料具有相变潜热高，相变温度和热机循环的最高温度相适应等优点，是目前应用最广泛的高温相变蓄热材料。热物性是对特定相变传热过程进行基础研究、分析计算和储能设备的工程设计的关键参数。由于熔盐相变蓄热材料熔点附近的热扩散率、热导率等至今尚无适宜的测量方法，故文献中这类数据缺乏，给生产和科研造成了困难。本研究进一步发展了Lamvik教授提出的物质相变热物性参数测量的理论和方法，在对其学术思想和测试技术修正和完善的基础上，进行再创新，引入数值技术，研究熔盐相变蓄热材料固、液相熔点附近热物性参数的测量新方法，开发了基于该新方法的热物性测试仪，为获取国内外目前缺乏的熔盐相变蓄热材料熔点热物性数据提供了新途径。并研究了提高相变储能装置内相变蓄热材料固、液相有效热导率，强化传热速率的途径，为相变蓄热材料性能及蓄热装置的优化提供了一定的理论依据。

中文关键词： 熔盐相变蓄热材料；热物性参数测量；热扩散率；热导率

英文摘要： Phase-transition heat-storage technology can be applied to resolve the mismatching contradiction between supply and demand of energy. Meanwhile, it is also an effective method for improving energy efficiency. Molten salt materials are such high temperature phase-transition thermal storage materials to be most extensively adopted at present due to such virtues as high latent heat of phase transition, compatibility between the transformation point and the highest temperature of heat engine circulation, et al. Thermo-physical properties are the key parameters for basic researches, analysis and engineering calculation of energy-storage equipment for the heat transfer process of specific phase transformation. Nevertheless, no suitable way has been found yet to determine thermal diffusivity and thermal conductivity near the melting point of such materials nowadays, that causes the lack of relative literature data and then causes inconvenience in research and production. In this research, Measuring theories and methods about thermophysical property of phase-transition materials brought forward by Professor Magne Lamvik are further developed to meet the need for parameter determination of molten-salt phase-transition heat-storage materials. Firstly, Lamvik's determination method is renovated based on further modification and perfection in the academic ideas and measuring techniques, and numerical simulation is introduced to develop a new measuring method to obtain the thermophysical properties of materials near the transformation point. Secondly, equipment for measurering thermophysical properties based on the new technique above is to be developed and used to enrich the thermophysical property data for molten-salt phase-transition materials. Furthermore, approaches are made to improve the effective thermal conductivity in solid/liquid phase and intensify the rate of heat transfer, which will lay the foundation for optimizing the virture of phase-transition heat-storage materials.

英文关键词： molten-salt phase-transition heat-storage material; measurement of thermal-physical property; thermal diffusivity; thermal conductivity