壳管式潜热蓄能系统换热特性

doi:10.3969/j.issn.0438-1157.2012.z2.003

化工学报 ›› 2012, Vol. 63 ›› Issue (S2): 14-20.DOI: 10.3969/j.issn.0438-1157.2012.z2.003

壳管式潜热蓄能系统换热特性

张鹏¹, 肖鑫¹, 王如竹¹, 李明²

1. 上海交通大学制冷与低温工程研究所, 上海 200240;
2. 云南师范大学太阳能研究所, 云南昆明 650092

收稿日期:2012-09-18 修回日期:2012-09-25 出版日期:2012-12-28 发布日期:2012-12-28
通讯作者: 张鹏
作者简介:张鹏(1973-),男,博士,教授。
基金资助:
国家自然科学基金-云南联合基金重点项目(U1137605);上海交通大学研究生创新基金项目(Z-020-026)。

Heat transfer characteristics of shell-tube latent thermal energy storage system

ZHANG Peng¹, XIAO Xin¹, WANG Ruzhu¹, LI Ming²

1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Solar Energy Research Institute, Yunnan Normal University, Kunming 650092, Yunnan, China

Received:2012-09-18 Revised:2012-09-25 Online:2012-12-28 Published:2012-12-28
Supported by:
supported by the Key Project of National Natural Science Foundation of China (U1137605) and the Innovation Program for Graduate Student of Shanghai Jiao Tong University(Z-020-026).

摘要/Abstract

摘要： 针对目前石蜡潜热蓄能系统效率低下的特点,构建了石蜡/膨胀石墨混合相变材料的潜热蓄能系统,研究了其蓄/放热特性,并与纯石蜡相变材料系统进行了对比分析,讨论了不同换热流体流量下的蓄/放热过程的时间周期。用焓法处理相变区域,对该潜热蓄能系统的整体蓄热过程进行数值模拟。研究结果表明,对于石蜡／膨胀石墨复合相变材料,其导热性能较纯石蜡有很大提高,但由于添加了膨胀石墨而减弱了蓄热中石蜡的对流换热。流量提高对蓄/放热速率有明显的改善。焓法模型能全面反映蓄能系统的换热与流动特性,数值计算的结果与实验数据吻合较好。

关键词: 潜热蓄存, 复合相变材料, 热特性, 数值计算

Abstract: The charging and discharging characteristics of a latent thermal energy storage(LTES)system using pure paraffin and composite paraffin/expanded graphite(EG)PCMs were experimentally investigated.The results showed that the thermal conductivity of the composite PCM was distinctly enhanced,whereas natural convection was hampered because the paraffin was confined in the porous structure of the EG.The time-durations of the charging and discharging processes with different flow rates for heat storage/retrieval were discussed.The time-duration of composite PCM during the discharging process was reduced more than that during the charging process,and the charging and discharging rates could be improved significantly with the higher flow rate.The charging process of the LTES system was numerically investigated with enthalpy method,which was verified by the experimental results.

Key words: latent thermal energy storage, composite phase change materials, thermal characteristics, numerical calculation

中图分类号:

TK02

张鹏, 肖鑫, 王如竹, 李明. 壳管式潜热蓄能系统换热特性[J]. 化工学报, 2012, 63(S2): 14-20.

ZHANG Peng, XIAO Xin, WANG Ruzhu, LI Ming. Heat transfer characteristics of shell-tube latent thermal energy storage system[J]. CIESC Journal, 2012, 63(S2): 14-20.

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壳管式潜热蓄能系统换热特性

Heat transfer characteristics of shell-tube latent thermal energy storage system

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