Experimental Study on the Thermal Performance of High-Temperature Shell-and-Tube Molten Salt Phase-Change Thermal Energy Storage

doi:10.7652/xjtuxb201705001

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Experimental Study on the Thermal Performance of High-Temperature Shell-and-Tube Molten Salt Phase-Change Thermal Energy Storage

更新时间：2025-07-09

- Experimental Study on the Thermal Performance of High-Temperature Shell-and-Tube Molten Salt Phase-Change Thermal Energy Storage
- Vol. 51, Issue 5, Pages: 1-8(2017)
- 作者机构：
  
  西安交通大学热流科学与工程教育部重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201705001
  CLC： TK124
- Online First：10 May 2017，
  
  Published：2017
- 稿件说明：
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Experimental Study on the Thermal Performance of High-Temperature Shell-and-Tube Molten Salt Phase-Change Thermal Energy Storage[J]. 2017, 51(5): 1-8.
DOI：

Experimental Study on the Thermal Performance of High-Temperature Shell-and-Tube Molten Salt Phase-Change Thermal Energy Storage[J]. 2017, 51(5): 1-8. DOI： 10.7652/xjtuxb201705001.

摘要

为揭示高温熔融盐相变蓄热器的蓄放热特性

并进一步提高其蓄热性能

搭建了高温梯级熔融盐相变蓄热实验台(最高蓄热温度可达800 ℃)

对高温套管式熔融盐相变蓄热器开展了蓄/放热性能实验研究。首先选择蓄热性能优良的二元碳酸盐作为高温相变蓄热材料

测试了其热物性; 其次实验研究了高温套管式熔融盐相变蓄热器的总蓄/放热时间、平均蓄/放热速率以及蓄热效率等蓄/放热性能。结果显示:相变蓄热材料的熔化过程存在着非均匀性; 在放热过程中

位于不同位置的相变蓄热材料存在着不同程度的过冷现象。最后

实验研究了在熔融盐侧添加环形肋片对高温熔融盐相变蓄热器的蓄/放热性能的强化效果

以及空气温度、质量流量等运行参数分别对光管和肋片管相变蓄热器总蓄/放热量、平均蓄/放热速率以及蓄热效率的影响。结果显示

在添加肋片后

相变蓄热材料温度分布更加均匀

蓄热过程结束时相变蓄热材料的最大温差由51.1 ℃下降到43.2 ℃

下降了15.4%

高温相变蓄热器的平均蓄热速率与平均放热速率分别增加了6.8%和9.1%。实验结果可为后续高温梯级熔融盐相变蓄热器的性能研究以及实际应用提供参考。

Abstract

The high-temperature molten salt phase-change thermal energy storage(PCTES)has been preferably used in concentrated solar power(CSP)plant heat storage due to its high energy density and constant charging/discharging temperature. A test bench of high-temperature cascaded molten salt PCTES was established to study its thermal performance. A eutectic carbonate salt with good thermal performance was chosen as the high-temperature phase-change material(PCM)

and its thermo-physical properties were measured. Subsequently

the thermal performance of the PCTES was experimentally studied. The results show that in charging process

the melting process of PCM along the radial direction is not uniform

and in discharging process

the degree of supercooling varies with different locations of PCM. Moreover

the enhancement effect of annular fins on the thermal performance of PCTES was also experimentally studied. Results show that after adding annular fins

the distribution of PCM temperature become more uniform

the maximum temperature difference of PCM is decreased by 15.4% from 51.1 ℃ to 43.2 ℃

and the average charging and discharging rates are increased by 6.8% and 9.1% respectively. At last

a study on the effects of such operation parameters as air temperature and mass flow rate on the thermal performance of PCTES was conducted. These experimental results may be a reference for the future study on the high-temperature cascaded PCTES.

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references

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