弯管强化相变储热传热特性的模拟

储能科学与技术 ›› 2012, Vol. 1 ›› Issue (2): 116-122.

弯管强化相变储热传热特性的模拟

王培伦¹, 彭志坚¹, 王述浩², 汪翔², 丁玉龙^{2, 3}

1 中国地质大学(北京)工程技术学院,北京 100083;
2 中国科学院过程工程研究所,北京 100190;
3 利兹大学颗粒科学与工程研究中心,利兹 LS2 9JT

收稿日期:2012-07-16 出版日期:2012-11-19 发布日期:2012-11-19
通讯作者: 彭志坚(1964--),男,教授,博士生导师,主要研究方向为陶瓷材料,E-mail:pengzhijian@cugb.edu.cn.
作者简介:王培伦(1984--),男,硕士研究生,主要研究方向为储能换热器优化设计,E-mail:wplwhl@163.com
基金资助:
中国科学院重点部署项目(KGZD-EW-302-1),科技部支撑项目(2012BA03B00),英国工程和物理科学基金(EP/K002252/1)

Numerical simulation of heat transfer behaviour of a twisted pipe containing a phase change material

WANG Peilun¹, PENG Zhijian¹, WANG Xiang², DING Yulong^{2, 3}

1 School of Engineering and Technology,China University of Geosciences,Beijing 100083,China;
2 State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;
3 Institute of Particle Science and Engineering,the University of Leeds, Leeds LS2 9JT,UK

Received:2012-07-16 Online:2012-11-19 Published:2012-11-19

摘要/Abstract

摘要： 对高温熔融盐管壳式相变换热器进行了三维非稳态模拟研究.在考虑自然对流的情况下,模拟对比了直管式和弯管式相变换热的传热特性,考虑了流速,进口温度以及进口截面形状对储热性能的影响.结果表明,在熔化相同体积的相变材料的前提下,弯管可以缩短超过15 %的熔化时间,换热特性明显优于直管系统.分析表明,弯管更好的换热特性主要是由于弯管内的二次流加强了换热,并且弯管也增加了换热面积.根据直管相变换热器与已有实验结果的对比显示模拟结果与实验结果有一定的差距,但是变化趋势一样,因而模拟结果可为装置的优化设计提供参考依据.

关键词: 相变材料, 储热换热器, 弯管, 数值模拟

Abstract: Three dimensional unsteady-state modeling has been performed on the heat transfer behavior of a heat exchange system made of both a straight and a twisted pipe containing a phase change material(PCM). Natural convection was considered in the modeling. Effects of various factors including fluid velocity, inlet temperature and the configuration of the pipe inlet were examined. The results showed that, given the amount of PCM, the melting time of the twisted pipe heat exchange system was over 15% shorter than the straight pipe configuration. Analyses suggested the secondary flow induced by the twisted pipe as well as the increased heat exchange surface area be the main reasons for the reduction in the melting time. The modeling results of the straight pipe show a deviation from the measurement, but the trend agrees fairly well. This indicates that the modeling results could serve as a guidance for the design and optimization of the phase change heat exchange systems.

Key words: phase change material, thermal energy storage exchanger, twisted pipe, numerical simulation

中图分类号:

TK02

王培伦, 彭志坚, 王述浩, 汪翔, 丁玉龙. 弯管强化相变储热传热特性的模拟[J]. 储能科学与技术, 2012, 1(2): 116-122.

WANG Peilun, PENG Zhijian, WANG Xiang, DING Yulong. Numerical simulation of heat transfer behaviour of a twisted pipe containing a phase change material[J]. Energy Storage Science and Technology, 2012, 1(2): 116-122.

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