Melting Assessment on the Up-under Multistage Design for a Novel Latent Heat Thermal Energy Storage Unit

ZHANG Zhongbin; ZHU Zhehao

doi:10.13334/j.0258-8013.pcsee.240276

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Melting Assessment on the Up-under Multistage Design for a Novel Latent Heat Thermal Energy Storage Unit

更新时间：2026-10-12

- Melting Assessment on the Up-under Multistage Design for a Novel Latent Heat Thermal Energy Storage Unit
- Vol. 45, Issue 15, Pages: 6012-6024(2025)
- 作者机构：
  
  东北电力大学能源与动力工程学院,吉林市,吉林省,132012
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.240276
  CLC：
- Published：2025
- 稿件说明：
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ZHANG Zhongbin, ZHU Zhehao. Melting Assessment on the Up-under Multistage Design for a Novel Latent Heat Thermal Energy Storage Unit[J]. 2025, 45(15): 6012-6024.
DOI：

ZHANG Zhongbin, ZHU Zhehao. Melting Assessment on the Up-under Multistage Design for a Novel Latent Heat Thermal Energy Storage Unit[J]. 2025, 45(15): 6012-6024. DOI： 10.13334/j.0258-8013.pcsee.240276.

摘要

为解决水平套管式相变蓄热装置熔化一致性差的问题，该文提出一种上下级联布置蓄热结构，并建立三维蓄热单元模型(模型1，模型2-n，模型2-N)。采用数值模拟的方法，对比分析3种模型的相变过程、完全融化时间、平均储热速率、㶲性能等性能指标。详细阐述此种新型结构的优越性能。结果表明：模型2-N相比模型2-n与模型1有更短的完全融化时间与更高的平均储热速率。模型2-N相比模型1与模型2-n的完全融化时间分别减少36.2%和19.4%，平均储热速率分别提升20.1%和11.8%。此外，模型2-N相比模型2-n与模型1的完全熔化均匀性以及温度场均匀性有较为明显的改善。模型2-N的上下扇区的完全融化时间差值仅为4.6%。另外，模型2-N在降低熵产数以及提高㶲效率方面也更有优势。该文可为水平套管式相变蓄热装置高效运行提供方向指引和理论借鉴。

Abstract

To solve the problem of poor melting consistency for the horizontal shell-and-tube latent heat thermal energy storage (LHTES) unit. An up-under cascaded arrangement structure is proposed

and a three-dimensional LHTES unit model (Case 1

Case 2-n

Case 2-N) is established in the paper. Performance evaluation indices such as phase change process

complete melting time

average thermal energy storage rate

and exergy performance of the three models are compared and analyzed

and the superior performance of the novel structure is expounded in detail. The results illustrate that Case 2-N has a shorter period of melting time and a higher average thermal energy storage rate than Case 2-n and Case 1. The complete melting time of Case 2-N reduces by 36.2% and 19.4% compared with Case 1 and Case 2-n

and the average thermal energy storage rate improves by 20.1% and 11.8% compared to Case 1 and Case 2-n. Moreover

complete melting uniformity and temperature field uniformity also have a noticeable improvement for Case 2-N compared to Case 2-n and Case 1. The complete melting time difference of the upper and lower sector regions for Case 2-N is only 4.6%. In addition

Case 2-N has advantages in minimizing entropy generation number and improving exergy efficiency. This paper can provide direction guidance and theoretical reference for the high-efficiency operation of horizontal shell-and-tube LHTES units.

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