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。
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.
作者
张仲彬
朱哲昊
ZHANG Zhongbin;ZHU Zhehao(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)
出处
《中国电机工程学报》
北大核心
2025年第15期6012-6024,I0021,共14页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
基金
国家自然科学基金项目(52176003)。
关键词
相变蓄热
热性能
上下级联设计
数值模拟
性能优化
phase change heat storage
thermal characteristics
up-under multistage storage design
numerical simulation
performance optimization
作者简介
张仲彬(1973),男,博士,教授,硕士生导师,主要研究方向为强化热及可再生能源利用等,zhangzhongb@126.com;朱哲昊(1999),男,硕士研究生,主要研究方向为级联相变蓄热系统性能,2202100525@neepu.edu.cn。
