The design, in which the capsules are packed in the bed at different sections based on the Phase Change Material (PCM) melting temperature, is an effective method to improve the heat-storage performance of the latent heat energy storage system. A latent heat storage system was established in the present study in order to optimize the arrangement of cascaded PCM capsules. Four kinds of paraffin with different melting temperatures were selected as the PCM for the experiment. The effects of stage number, cascade ratio and melting temperature on the heat-storage performance of the latent heat storage system were investigated during the charging and discharging operations. The complete time of charge and discharge, heat storage-release capacity, energy efficiency, exergy efficiency and entransy dissipation (based on a new entransy theory) were computed for different arrangement cases, in order to analyze and evaluate the heat-storage performance of the system under different stage numbers and cascade ratios of PCMs. The results revealed that the arrangement of cascaded PCM capsules has an obvious effect on the heat-storage performance of the system. When more high melting PCMs are adopted, the heat storage-release capacity, energy efficiency and exergy efficiency increases, while the entransy dissipation decreases. However, the temperature increase becomes slow, and the charging or discharging process becomes long.

根据相变材料（PCM）的熔化温度，在不同位置将胶囊包装在床上的设计是一种有效的方法，可以提高潜热能量存储系统的储热性能。在本研究中建立了一个潜热存储系统，以优化级联的PCM胶囊的布置。实验选择了四种熔点不同的石蜡作为PCM。在充放电过程中，研究了级数，级联比和熔融温度对潜热存储系统储热性能的影响。完成充放电时间，蓄热释放能力，能源效率，计算了不同布置情况下的火用效率和火力耗散（基于新的火线理论），以分析和评估系统在不同级数和PCM级联比下的储热性能。结果表明，级联PCM胶囊的排列对系统的蓄热性能有明显的影响。当采用更高熔点的PCM时，蓄热释放能力，能效和火用效率都会提高，而传递耗散会降低。然而，温度升高变慢，并且充电或放电过程变长。结果表明，级联PCM胶囊的排列对系统的蓄热性能有明显的影响。当采用更高熔点的PCM时，蓄热释放能力，能效和火用效率都会提高，而传递耗散会降低。然而，温度升高变慢，并且充电或放电过程变长。结果表明，级联PCM胶囊的排列对系统的蓄热性能有明显的影响。当采用更高熔点的PCM时，蓄热释放能力，能效和火用效率都会提高，而途中耗散会降低。然而，温度升高变慢，并且充电或放电过程变长。