相变蓄冷装置内传热及相变特性研究

Study on heat transfer and phase change characteristics in phase change cold storage rig

建立了三种不同蓄冷球球径堆叠方式的相变蓄冷装置模型,对其进行了数值模拟以研究其内部传热及相变特性。结果表明:随着流速的提高、蓄冷球直径的减小,蓄冷结束后三种方案中装置内蓄冷球的凝固率提升显著;双球径方案与单球径方案装置内蓄冷球凝固率随时间变化的规律在蓄冷过程初段相类似,但两方案中相同球径部分蓄冷球相变结束,双球径方案中发生相变的蓄冷球由大直径转变为小直径时,其凝固率随时间变化的速度逐渐超过单球径方案。该研究可为相变蓄冷装置的实际设计及性能优化提供参考。

Models for phase change cold storage rig with three different sphere diameter schemes were established and the heat transfer characteristics and phase transition behavior were numerically studied. The results show that with the increase of the flow rate and the decrease of the diameter of the cold energy storage balls, the solidification rate of the balls in the three schemes increases significantly. The variation law of solidification rate of the cold storage sphere in the double-sphere diameter scheme is similar to that in the single-sphere diameter scheme in the initial stage of the cold energy storage process, but when the phase transition of the cold storage sphere in the double-sphere diameter scheme is changed from large diameter to small diameter, the solidification rate gradually changes faster than that in the single-sphere diameter scheme. The results can provide reference for the practical design and performance optimization of phase change coldstorage device.