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

2001-2002年度国家科学研究资助计划(B)(2)资助项目“高密度蓄热技术研究及潜热乳胶浆节能应用方法研究”。本课题的目的是从新能源系统发展的角度，通过对乳化液和高性能潜热蓄热材料的基本信息进行分析，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状液作为固-液相变材料，首先选择最合适的潜热乳状液作为蓄热系统。物理性质(颗粒大小、导热系数、比热、潜热、粘度等)。对所选乳状液的各项性能进行了评价，并推导出了这些物理性能的实用关联式。乳状液的潜热释放采用冷热空气与石蜡作为相变材料的直接接触换热方式。以温度效率、显热释放/储存时间和潜热释放/储存时间为实验参数。用乳化层深度表示乳化层尺寸、气流雷诺数、斯特凡数和热容比，建立了这些参数的无因次关联式。最后，与传统的潜热蓄热系统进行了比较，说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.