相变蓄热球体堆积床传热模型及热性能分析

Analysis of the thermal performance of thermal energy storage systems using PCM capsules

为提高普适性和预测性 ,建立了相变蓄热球体堆积床热性能的传热模型 ,可以对系统多种热性能参数进行计算分析。经验证明模型结果与实验结果较吻合。表明该模型对相变蓄热球体堆积床的结构设计、性能模拟及运行管理可提供理论指导。

Simple model was developed for analyzing the thermal performance of thermal energy storage systems using PCM (phase change material) capsules. The model could analyze the thermal performance of such a unit, including the timewise fluid temperature variation and the phase change interface distribution along the axial direction, the timewise variation of the heat transfer rate, the thermal storage capacity, the effective heat transfer coefficient, the effective heat transfer area, and the molten/frozen mass fraction. The model considered the influence of some parameters such as sphere diameter, PCM characteristics, heat transfer fluid characteristics and velocity on the thermal performance of the unit. The model was verified using experimental data from the literature. It can be used for designing and analyzing the thermal performance of thermal energy storage systems using PCM capsules.