容器热物性参数对蓄热系统性能影响的数值研究

建立了分析潜热蓄热系统蓄热性能的二维数学模型,并进行了数值计算.其中考虑了容器壁面的导热,且相变传热只考虑导热模型,对相变材料(PCM)相变过程的求解采用解耦法计算模型.对几种不同材料容器内PCM熔化过程进行了数值计算比较,结果表明,容器材料的导热系数、比热容和密度等热物性参数对PCM的熔化有很大的影响.此外还对不同初始温度和边界壁温对PCM熔化的影响进行了数值计算.所得结论对潜热蓄热系统的热性能及其优化设计有一定的指导作用.

Numerical investigation of the effect of thermo physical properties on the performance of heat storage system

Two-dimensional mathematical model of latent heat storage performance are presented for heat storage system considering the conduction of container wall, and assuming the process of phase change heat transfer is only by conduction. The decoupled method computational model was used to analyze the phase change process of phase change material (PCM). Numerical calculation and comparison of the melting process of PCM were made for various types of container materials. The results show that thermo physical properties of thermal conductivity, specific heat and density of the container material have very important effects on the melting of PCM. Further, numerical calculation and comparison of the melting process of PCM were made for different values of initial temperature and boundary wall temperature. The conclusion provides guidelines for latent heat storage system thermal performance and design optimization.