This study presents quantitative results of charging experiments conducted on cascaded thermal energy storage system (CTESS) integrated with external compound parabolic concentrator solar collector (XCPCSC). Increasing mass flow rate in 2‐stage CTESS integrated with XCPCSC resulted in a 30% reduction in initiation time of phase change materials (PCMs) during charging, with a higher mass flow rate of 0.025 kg/s. However, due to disparate melting point temperatures of PCMs, phase transition in the two‐stage CTESS did not occur simultaneously, leading to poor heat transfer rates within the CTESS. To address this, study extended number of phases from two to three, resulting in a 1.5‐fold increase in rate of heat transfer compared to 2‐stage PCM system. The simultaneous melting processes at various stages in the CTESS maximized energy absorption, leading to a 25% increase in system efficiency. Notably, the values of energy stored efficiency and over‐all efficiency reached their peak values of 95% and 60%, respectively, between t = 12.00 h and t = 13.00 h. This time period also saw a significant increase in collector efficiency to 72%. These quantitative findings highlight importance of mass flow rate and PCM arrangement in achieving efficient heat transfer and system performance in a CTESS integrated with XCPCSC.

中文翻译：

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评估具有级联潜热蓄热功能的外部复合抛物面聚光太阳能集热器的性能

本研究展示了在与外部复合抛物面聚光太阳能集热器（XCPCSC）集成的级联热能存储系统（CTESS）上进行的充电实验的定量结果。与 XCPCSC 集成的 2 级 CTESS 中质量流量的增加导致充电期间相变材料 (PCM) 的引发时间减少 30%，质量流量更高，达到 0.025 kg/s。然而，由于相变材料的熔点温度不同，两级 CTESS 中的相变不会同时发生，导致 CTESS 内的传热速率较差。为了解决这个问题，研究人员将相数从两级增加到了三级，与两级 PCM 系统相比，传热速率提高了 1.5 倍。 CTESS 中各个阶段的同步熔化过程最大限度地提高了能量吸收，从而使系统效率提高了 25%。值得注意的是，储能效率和整体效率的值分别在 95% 和 60% 之间达到峰值t= 12 点并且t= 13 点。在此期间，集热器效率也显着提高至 72%。这些定量研究结果强调了质量流量和 PCM 布置对于在与 XCPCSC 集成的 CTESS 中实现高效传热和系统性能的重要性。