Research on solidification of electrolyzed water for ice storage system

在动态式冰蓄冷系统中，选择水作为蓄冷材料是有利的，因为它是环境友好的和便宜的。对于动态式冰蓄冷系统，可采用的方法有很多种。方法之一是在冷却管内保持水的过冷状态，并将水排出冷却管后使其凝固。然而，它有一个问题，堵塞由于凝固的过冷水发生在管内，意外。本研究选用电解水作为凝固控制剂。氢离子浓度的参数是从6.0到11.0 pH值变化，和pH值的影响，在冻结过冷度进行了研究。有人发现，在冻结的过冷度增加，从中性点的pH值向两侧移动。考虑到pH值的差异对平均团簇尺寸的影响，讨论了成核物理机制。由于质子跳跃的发生，通过使pH从中性移动，簇趋于变小。通过蒸发实验检查团簇大小的差异，并证实这是真实的。此外，还对电解水的主动冻结控制方法进行了实验研究。发现对电解水施加电场或超声波是有效的。

In dynamic type of ice thermal storage system, selecting water as a heat storage material is beneficial, because it is environmentally friendly and cheap. There are many methods adopting for dynamic type of ice storage system. Keeping water at supercooling state in a cooling pipe and solidifying the water after discharging it out of the pipe is one of the methods. However, it has a problem of blockade due to solidification of supercooled water taken place inside the pipe, accidentally. In this research, electrolyzed water was selected to find the possibility of controlling the solidification. The parameter for hydrogen ion concentration was varied from 6.0 to 11.0 pH, and the effect of pH on the degree of supercooling at freezing was investigated. It was found that the degree of supercooling at freezing increased by shifting the pH from the neutral point to both sides. The mechanism of nucleation physics was discussed by considering the effect of the difference in pH on the average cluster size. The cluster tends to become smaller by shifting pH from the neutral due to the occurrence of proton jump. The difference in cluster size was examined through vaporizing experiments, and it was confirmed to be true. Furthermore, active freezing control methods on electrolyzed water were also investigated, experimentally. It was found that applying an electric field or ultrasonic waves on electrolyzed water were effective.