相变蓄热单元性能强化的数值研究

doi:10.3969/j.issn.2095-4239.2014.03.003

储能科学与技术 ›› 2014, Vol. 3 ›› Issue (3): 197-202.doi: 10.3969/j.issn.2095-4239.2014.03.003

相变蓄热单元性能强化的数值研究

刘永坤, 陶于兵, 唐宗斌

西安交通大学能源与动力工程学院,热流科学与工程教育部重点实验室,陕西西安 710049

收稿日期:2014-03-11 出版日期:2014-05-01 发布日期:2014-05-01
通讯作者: 陶于兵,副教授,研究方向为强化传热及相变储热,E-mail:yubingtao@mail.xjtu.edu.cn.
作者简介:第一作者:刘永坤(1989--),男,硕士研究生,研究方向为相变储热,E-mail:liuyongkun0_0@stu.xjtu.edu.cn;
基金资助:
中央高校基本科研业务费专项资金资助; 国家重点基础研究发展计划(973)项目(2013CB228303)

Numerical study on performance enhancement of latent heat storage unit

LIU Yongkun, TAO Yubing, TANG Zongbin

Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,Shanxi,China

Received:2014-03-11 Online:2014-05-01 Published:2014-05-01

摘要/Abstract

摘要： 建立了考虑液态相变材料自然对流的壳管式相变蓄热单元的三维模型,数值分析了自然对流对相变蓄热过程的影响.对比研究了外侧强化传热管和双侧强化传热管对相变蓄热单元蓄热性能的强化效果.结果表明,液态相变材料的自然对流,会引起固-液界面分布不均匀现象,采用外翅片管可以有效削弱这一现象;采用外侧强化传热管和双侧强化传热管,都可以缩短相变材料完全熔化以及整个蓄热过程所需时间.与采用光管时相比,采用外侧强化传热管时,完全熔化时间减少了18.0%;采用双侧强化传热管时,完全熔化时间减少52.5%.可见,采用带有外翅片的强化传热管,不仅可以削弱自然对流引起的固-液界面不均匀性问题,而且可以强化相变蓄热单元的蓄热性能.

关键词: 相变蓄热, 自然对流, 性能强化, 强化传热管

Abstract: A three dimensional model for a shell-and-tube latent heat storage (LHS) unit was established to investigate the effect of liquid PCM natural convection on the performance. The enhancement effects of the outside enhanced tube and the bilateral enhanced tube were comparatively studied with the smooth tube. The results show that the natural convection can cause nonuniform distribution of solid-liquid interface and the nonuniformity can be weakened by using the designed enhanced tubes. At the same time, the presented enhanced tube can reduce the PCM melting time and total charging time. Compared with the PCM melting time of the smooth tube, the PCM melting time of the outside enhanced tube is reduced by 18.0% and the PCM melting time of the bilateral enhanced tube is reduced by 52.5%. In a conclusion, the presented finned enhanced tube can not only weaken the nonuniform distribution of solid-liquid interface caused by liquid PCM natural convection, but also enhance the LHS performance.

Key words: latent heat storage, natural convection, performance enhancement, enhanced heat transfer

中图分类号:

TK531.5

刘永坤, 陶于兵, 唐宗斌. 相变蓄热单元性能强化的数值研究[J]. 储能科学与技术, 2014, 3(3): 197-202.

LIU Yongkun, TAO Yubing, TANG Zongbin. Numerical study on performance enhancement of latent heat storage unit[J]. Energy Storage Science and Technology, 2014, 3(3): 197-202.

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相变蓄热单元性能强化的数值研究

Numerical study on performance enhancement of latent heat storage unit

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