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

本项目“高密度储热及潜热乳化液节能应用方法的开发”获2001 - 2002年度科研资助项目(B)(2)资助。本项目旨在从新能源系统发展的角度出发，通过对乳化液和高性能潜热储能的基本信息进行分析，为潜热储能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。本工程首先选择了最适合于蓄热系统的潜热乳化液。并对所选乳液的物理性能（粒径、导热系数、比热、潜热、粘度等）进行了评价，推导了这些物理性能的相关方程。采用热空气或冷空气与石蜡直接接触换热的方法进行乳化液的潜热释放。以温度效应、感热释放/储存时间和潜热释放/储存时间为实验参数。导出了用无量纲乳化液层深度表示乳化液层尺寸、气流雷诺数、斯特芬数和热容比的无量纲相关方程。最后，将该潜热储热系统与传统的潜热储热系统进行了比较，说明了该潜热乳液系统的实用性。

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.