Development of High-density Heat Storage and Application Method of Latent Heat Emulsion Slurry for Energy Conservation.

本课题“高密度蓄热技术的开发及潜热乳化液节能应用方法”于2001年至2002年获得了科研资助金（B）（2）的资助。本课题的目的是从开发新能源系统的观点出发，通过分析乳化液和高性能潜热蓄热的基本信息，为潜热蓄热材料的学术系统化和实际应用提供数据。本项目采用低熔点石蜡水乳液作为固-液相变材料，首先筛选出最适合于蓄热系统的潜热型乳液浆料。和物理性质（粒度、导热系数、比热、潜热、粘度等）。对所选乳液的物理性质进行了评价，并导出了这些物理性质的实用关联式。采用热空气或冷空气与石蜡相变材料直接接触的方法，对乳化液的潜热释放进行了研究。温度有效性，显热释放/存储时间和潜热释放/存储时间作为实验参数进行了测量。以无因次乳化层深度表示的乳化层维数、气流雷诺数、Stefan数和热容比，导出了这些参数的无因次关联式。最后，通过与传统潜热蓄热系统的比较，对该潜热蓄热系统进行了评价，阐明了所提出的潜热乳化液蓄热系统的实用性。

This project of "Development of High-density Heat Storage and the Application Method of Latent Heat Emulsion Slurry for Energy Conservation" was supported by Grant-in-Aid for Scientific Research (B) (2) between 2001 and 2002. The purpose of this project was to obtain the data for academic systematization and practical application of latent heat storage material by analyzing basic information on the emulsion and the high-performance latent heat storage from a viewpoint of development of new energy system. In this project, Paraffin wax water emulsion at a low melting point was used as a solid-liquid phase change material.In this project, the most suitable latent heat emulsion slurry was selected for heat storage system at first. And the physical properties (particle size, thermal conductivity, specific heat, latent heat, viscosity, etc.) of selected emulsion were evaluated, and the useful correlative equations for these physical properties were derived. Direct-contact heat exchange method between a hot or cold air and Paraffin as PCM was selected for the latent heat-release from the emulsion. The temperature effectiveness, the sensible heat release/storage time and the latent heat release/storage time were measured as experimental parameters. The useful non-dimensional correlation equations for those parameters were derived in terms of non-dimensional emulsion layer depth expressed the emulsion layer dimension, Reynolds number for airflow, Stefan number and heat capacity ratio. Finally, this latent heat storage system was evaluated in comparison with the traditional latent heat storage system, and the usefulness of proposed latent heat emulsion system is elucidated.