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Effect of percussion vibration on solidification of supercooled salt hydrate PCM in thermal storage unit
Renewable Energy ( IF 8.7 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.renene.2018.03.077
Guobing Zhou , Maochuan Zhu , Yutong Xiang

Abstract Experiments are performed on the effect of percussion vibration on triggering solidification of supercooled sodium acetate (CH3COONa) salt solution in the rounded - rectangular thermal storage unit. To provide quantitative analysis, the steel ball freely falling down to the surface of PCM (phase change material) unit is applied for percussion vibration with parameters of percussion number and crystallization induction time. Factors such as the steel ball diameter and falling height, as well as the percussion position on the PCM unit are examined about their effects on the crystallization induction. The results show that it is favorable to activate solidification of supercooled sodium acetate solution with larger percussion momentum (larger ball diameter and higher falling height), percussion near the cover lid and edges of unit. A term named percussion effectiveness is also introduced for evaluation of percussion effect on solidification activation. The results in this paper are useful for seasonal thermal storage of solar energy within supercooled inorganic PCMs and control of discharging the stored energy for space heating.

中文翻译:

冲击振动对蓄热装置过冷盐水PCM凝固的影响

摘要 研究了冲击振动对圆角-矩形蓄热装置中过冷醋酸钠(CH3COONa)盐溶液触发凝固的影响。为了提供定量分析,钢球自由落到PCM(相变材料)单元的表面,以撞击次数和结晶诱导时间为参数进行撞击振动。检查了诸如钢球直径和下落高度以及 PCM 单元上的冲击位置等因素对结晶诱导的影响。结果表明,较大的冲击动量(较大的球直径和较高的落差)、靠近盖盖和单元边缘的冲击有利于激活过冷醋酸钠溶液的凝固。还引入了一个名为撞击效果的术语,用于评估撞击对凝固活化的影响。本文中的结果对于太阳能在过冷无机 PCM 中的季节性热储存和控制释放用于空间加热的储存能量很有用。
更新日期:2018-10-01
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