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

2001年至2002年国家科研补助金（B）（2）资助的“高密度蓄热开发及潜热乳液浆料节能应用方法”项目。该项目的目的是从新能源系统发展的角度，分析乳液和高性能潜热蓄热的基础信息，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，本项目首先选择了最适合蓄热系统的潜热乳液浆料。并对所选乳液的物理性质（粒径、导热率、比热、潜热、粘度等）进行了评估，并导出了这些物理性质的有用关联方程。选择热空气或冷空气与作为相变材料的石蜡之间的直接接触热交换方法来从乳液中释放潜热。测量温度有效性、显热释放/储存时间和潜热释放/储存时间作为实验参数。这些参数的有用的无量纲相关方程是根据无量纲乳剂层深度导出的，表示乳剂层尺寸、气流雷诺数、斯特凡数和热容比。最后，将该潜热存储系统与传统潜热存储系统进行比较进行评估，并阐明所提出的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.