Abstract The single tank molten salt thermal energy storage (TES) system has been extensively studied due to its low cost and high efficiency performance. The binary nitrates (KNO3+Ca(NO3)2) is selected as heat storage medium in this study, which the melting point is 116.9 °C. This research aims to achieve stable and constant heat discharging performance of the single tank molten salt TES system. Three different inlet velocity conditions such as constant value, manual and automatic adjustment are comparatively studied. The results show that the heat discharging power drops with the heat discharging time increases under constant inlet velocity. The heat discharging time decreases with the increasing of inlet velocity while the heat discharging power increases with the increasing of the inlet velocity. The correlations between the inlet velocity and heat discharging time, the average temperature of molten salt in the single tank are proposed. The heat discharging power of manual and automatic adjustment of inlet velocity is in ±10% and ±3% fluctuation of the set value. The results could provide practical and effective guide to design the single tank molten salt TES system.

中文翻译：

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单罐熔盐蓄热系统排热特性对比研究

摘要 单罐熔盐热能储存（TES）系统因其低成本、高效率的性能而受到广泛研究。本研究选用二元硝酸盐（KNO3+Ca(NO3)2）作为蓄热介质，其熔点为116.9℃。本研究旨在实现单槽熔盐TES系统稳定、恒定的散热性能。比较研究了恒定值、手动和自动调节三种不同的入口速度条件。结果表明，在恒定的入口速度下，排热功率随着排热时间的增加而下降。放热时间随着入口速度的增加而减少，而放热功率随着入口速度的增加而增加。提出了入口速度与排热时间、单槽熔盐平均温度之间的关系。手动和自动调节进风速度的排热功率在设定值的±10%和±3%波动范围内。研究结果可为单槽熔盐TES系统的设计提供实用有效的指导。