This study launches an impact evaluation of initial cold heat transfer fluid (HTF) temperature on heat storage and mechanical behaviours of a thermal stratification tank using phase change material (PCM) capsules and binary nitrate molten salt. A cyclic operation process of the tank is simulated under the condition with fixed parameters. The results show that the tank can operate stably and the durations of charging and discharging processes are 365.0 min and 264.0 min, respectively. The impact evaluation results of the initial cold HTF temperature on the thermal behaviour of the tank reveal that the initial cold HTF temperature has very small impact on the thermal and heat storage behaviours of the tank during charging processes, while a properly lower initial cold HTF temperature can improve the heat storage behaviour during discharging processes. The impact evaluation results of initial cold HTF temperature on the mechanical performance of the tank show that the peak mechanical stress of steel layer moves towards the higher height direction with the initial cold HTF temperature increased. When the initial cold HTF temperature is 506.0 K, the maximum mechanical stress of the steel layer is 111.8 MPa. The axial maximum mechanical stress of the steel layer can be reduced by increasing the initial cold HTF temperature.

这项研究使用相变材料（PCM）胶囊和二元硝酸盐熔融盐，对初始冷传热流体（HTF）温度对热分层罐的储热和机械性能进行了影响评估。在参数固定的条件下，模拟了水箱的循环运行过程。结果表明，该罐可以稳定运行，充放电时间分别为365.0 min和264.0 min。初始冷HTF温度对储罐热性能的影响评估结果表明，初始冷HTF温度在充装过程中对储罐的热和储热性能影响很小，而适当降低HTF的初始冷温度可以改善放电过程中的储热性能。初始HTF温度对罐体力学性能的影响评估结果表明，随着HTF初始温度的升高，钢层的峰值机械应力向较高的高度方向移动。当初始冷HTF温度为506.0 K时，钢层的最大机械应力为111.8 MPa。可以通过提高初始冷HTF温度来降低钢层的轴向最大机械应力。当初始冷HTF温度为506.0 K时，钢层的最大机械应力为111.8 MPa。可以通过提高初始冷HTF温度来降低钢层的轴向最大机械应力。当初始冷HTF温度为506.0 K时，钢层的最大机械应力为111.8 MPa。可以通过提高初始冷HTF温度来降低钢层的轴向最大机械应力。