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Heat and mass transfer of ice water slurry made by flowing supercooled water solution

过冷水溶液流动形成的冰水浆的传热传质

基本信息

批准号：
07555386
负责人：
INABA Hideo
金额：
$ 1.73万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555386/
关键词：
Ice Making Supercooled water solution Pipe Flow Transportaion of Ice Water slurry Organic Water Solution Degree of Supercooling Double Circular Tube Heat Exchanger Ice Nucleating Substance 傾斜管過冷度氷充填率無機水溶液過冷却度二重等式過冷却器

项目摘要

Because the ice strorage system can shift the peak electricity demand for a cooling, its application to a building cooling has been widely extended in recent years. Among the methods of ice making, a dynamic method of an usage of flowing supercooled water or water solution is the most effective one. This method forces the flowing water or water solution to be supercooledin the cooling pipe, and ice crystals are continuously formed in the ice storage vessel outside the pipe. Because it just need a simple piping system without the other complex apparatus, this method can be considered positively over the other ice making methods. So an experimental study has been performed to investigate the continuous ice making phenomena which could be use for an ice storage system. The critical condition of an occurrence of an ice blockage in the cooling tube has been examined in terms of the concentration of water solution and thermo-hydraulic operating parameters. The obtained results show that nondimensional correlation equations of the efficiency of ice making has been derived as a function of thermo- hydraulic parameters. In addition, the visual observations of transport phenomena of ice water slurry in a pipe flow and the measurements of pressure loss of that were carried out. The effects of the flow velocity, the pipe inclination angle, and ice packing factor on the transport characteristics of the ice water slurry were extensively determined. The relationship between the transported cold thermal energy and required pumping energy was also correlated using some experimental parameters. The obtained results of the present study are useful as the fundamental information for the advanced ice thermal energy system.

由于冰蓄冷系统可以转移用于冷却的峰值电力需求，近年来其在建筑物冷却中的应用已经被广泛地推广。在制冰方法中，使用流动过冷水或水溶液的动态方法是最有效的方法。该方法迫使流动的水或水溶液在冷却管中过冷，并且冰晶在管外部的储冰容器中连续形成。由于该方法只需要一个简单的管道系统，而不需要其他复杂的设备，因此可以肯定地说，该方法优于其他制冰方法。因此，本文对可用于冰蓄冷系统的连续制冰现象进行了实验研究。根据水溶液的浓度和热工水力运行参数，研究了冷却管内发生冰堵的临界条件。结果表明，制冰效率与热工水力参数之间存在无量纲关系。此外，还对冰水浆在管流中的输运现象进行了直观观察，并对管流中的压力损失进行了测量。广泛地确定了流速、管道倾角和冰填充因子对冰水浆输送特性的影响。利用实验参数关联了输送冷热能与所需泵浦能量之间的关系。本文的研究结果可作为先进冰热能系统的基础资料。