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Numerical analysis of latent heat thermal energy storage system

机译：潜热蓄热系统的数值分析

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This paper presents a comparative study of the total melting time of a phase change material (PCM) packed in three containers of different geometric configurations, viz. rectangular, cylindrical and cylindrical shell, having the same volume and surface area of heat transfer. Employing a slightly modified enthalpy method, which enables decoupling of the temperature and liquid fraction fields, the governing equation for one dimensional isothermal phase change is discretized using the Crank-Nicholson finite difference scheme. While the resulting system of algebraic equations for temperature is solved using the Thomas algorithm, the liquid fraction field is updated explicitly using the currently known temperature field. The results are presented for different masses of PCM filling the containers and inlet temperature of the heat transfer fluid (HTF). On the basis of detailed discussion of these results, it is concluded that for the same mass of PCM and surface area of heat transfer, cylindrical shell containers take the least time for equal amounts of energy storage, and this geometric effect is more pronounced with an increase in the mass of the PCM. It is also found that for cylindrical shell containers, an increase in the inlet temperature of the HTF from its lower range of values results in a drastic decrease in energy storage time, while this effect of inlet temperature of the HTF diminishes sharply at higher and higher values. Further, it is observed that as the mass of the PCM in the cylindrical shell container having a fixed surface area of heat transfer increases, the reduction in total melting time due to an increase in the inlet temperature of the HTF becomes more and more pronounced.
机译：本文对包装在三个具有不同几何形状的三个容器中的相变材料（PCM）的总熔化时间进行了比较研究。矩形，圆柱形和圆柱形的壳体，具有相同的体积和表面积的热传递。采用稍微修改的焓方法，该方法使得温度场和液体分数场能够解耦，使用Crank-Nicholson有限差分方案离散了一维等温相变的控制方程。使用Thomas算法求解温度的代数方程组的结果时，使用当前已知的温度场显式更新液体分数场。给出了针对不同质量的PCM填充容器和传热流体（HTF）的入口温度的结果。在对这些结果进行详细讨论的基础上，得出的结论是，对于相同质量的PCM和传热表面积，圆柱形外壳容器花费最少的时间进行等量的能量存储，并且这种几何效应在以下情况下更加明显： PCM的质量增加。还发现，对于圆柱形外壳容器，HTF的入口温度从其较低的值范围增加会导致能量存储时间急剧减少，而HTF入口温度的这种影响在越来越高的情况下会急剧减少。价值观。此外，观察到，随着具有固定的热传递表面积的圆柱形外壳容器中的PCM质量的增加，由于HTF的入口温度的增加而导致的总熔化时间的减少变得越来越明显。

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