| 摘要: |
| 相变蓄冷器是冰蓄冷空调的重要部件，蓄冷器管内蓄冷材料的流动状态对冰层具有一定影响。本文以蓄冷材料的进口条件、纳米复合相变材料的体积分数对蓄冷过程固液相变化、温度的影响为切入点, 通过数值模拟对套管式蓄冷器进行研究，获得了优化的蓄冷条件。结果发现：进口水温越低，蓄冰速度越快；入口速度对蓄冷过程的影响比温度小，适当提高流速可以减小进出口温差，使体系温度分布更加均匀；纳米流体的引入可以提高蓄冷效率，但体积分数的控制是关键，否则影响蓄冷效果。 |
| 关键词: 相变蓄冷器；纳米流体；蓄冰 液相率 流速 |
| DOI： |
| 投稿时间：2021-01-29 修订日期：2021-06-25
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| 基金项目:本文受国家电网公司科研项目-石墨烯复合材料高效蓄冰装置关键技术研究与工程示范(5419-202019385A-0-0-00)资助。 |
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| Effect of Inner Velocity and Temperature on Outer Ice Accumulation in Ice Storage |
| Chen Jihuan,Wang Qiyang,He Yuexing,Yang Xiao,Yang Dongmei,Liu Bin |
| (State Orid Zhejiang Electric Power Co. , Ltd.;Nari Group Corporation（State Orid Electric Power Research Institute）;State Orid Yiwu Zhejiang Electric Power Supply Co. , Ltd.) |
| Abstract: |
| The ice storage air conditioner plays a vital role in the energy consumption of buildings, economic cost, and peak-load regulation of the electricity grid. However, the effects of different flow in the tube of ice storage tank, which is the key component of ice storage air conditioning system, on the ice layer have not been clearly determined, and there is a lack of studies on the influence of nanofluid on ice storage. In this study, the inlet conditions of cold storage materials and the influence of the volume fraction of nanocomposite phase-change materials on the solid-liquid phase change and temperature in the cold storage process are investigated, and the optimal cold storage conditions are obtained via numerical simulation. The results show that the effect of the inlet velocity is smaller than that of the temperature, and an increase in the inlet velocity decreases the temperature difference between the inlet and outlet, which results in a more uniform temperature distribution. The addition of nanoparticles improves the efficiency of the ice accumulation, and the volume fraction of the nanoparticles is the most important factor because it may decrease the efficiency. |
| Key words: phase change ice storage tank nanofluid ice storage liquid phase rate velocity of flow |
