储能科学与技术 ›› 2017, Vol. 6 ›› Issue (4): 655-661.doi: 10.12028/j.issn.2095-4239.2017.0067

• 相变储能专刊 • 上一篇    下一篇

碳酸锂钠共晶盐复合相变材料的储放热特性

李  传1,李  琦2,姜  竹1,曹  慧1,谯  耕3,李永亮1,雷宪章3,丁玉龙1   

  1. 1英国伯明翰大学储能中心,英国 伯明翰 B15 2TT;2英国伦敦大学学院化学工程学院,英国 伦敦 WC1E 6BT;         3全球能源互联网欧洲研究院,德国 柏林 10117
  • 收稿日期:2017-05-23 修回日期:2017-06-08 出版日期:2017-07-01 发布日期:2017-06-09
  • 通讯作者: 丁玉龙,教授,主要研究方向为储能系统、储能过程中多相流动与传热强化、无机中高温复合储能材料、深冷(液化)空气储能、压缩空气储能等,E-mail:y.ding@bham.ac.uk。
  • 作者简介:李传(1986—),男,研究员,主要研究方向为多相流动和传热强化与优化、储能材料和储能单元/装置研究与优化设计,E-mail:c.li.4@bham.ac.uk。
  • 基金资助:
    UK EPSRC(EP/L019469/1,EP/L014211/1),全球能源互联网研究院(欧洲)委托项目(SGRI-DL-71-16-018)。

Charging and discharging behavior of carbonate-based salt composite phase change material modules

LI Chuan1, LI Qi2, JIANG Zhu1, CAO Hui1, QIAO Geng3, LI Yongliang1, LEI Xianzhang3, DING Yulong1   

  1. 1Birmingham Centre for Energy Storage, University of Birmingham, Birmingham B15 2TT, UK; 2School of Chemical Engineering, University College London, London WC1E 6BT, UK; 3 Global Energy Interconnection Research Institute Europe GmbH,
    Berlin 10117, Germany
  • Received:2017-05-23 Revised:2017-06-08 Online:2017-07-01 Published:2017-06-09

摘要: 对以碳酸锂钠共晶盐为相变材料,氧化镁颗粒为陶瓷基体和石墨为导热增强剂的复合相变材料模块储放热性能进行实验研究,并与纯相变材料进行了对比。结果表明,对于储热过程,添加有导热增强剂的复合材料模块储热性能明显高于纯相变材料,且其储热性能随着导热增强剂含量的增加而提高。当石墨质量含量从5%提高到30%时,材料模块整体的储热时间缩短29%。对于放热过程,实验考察了两种放热条件—自然对流和强制对流。结果表明,强制对流条件下材料模块的放热性能要优于自然对流条件下的放热性能。对比纯相变材料,复合材料模块的整体放热速率提高了近33%。

关键词: 碳酸锂钠, 相变材料, 复合储能材料, 储放热特性

Abstract: An experimental study has been performed on the charging and discharging behaviour of composite phase change material (CPCM) modules. The CPCM modules were made of a eutectic carbonate salt based phase change material (PCM, NaLiCO3), a thermal conductivity enhancement material (TCEM, graphite flake) and a ceramic skeleton material (CSM, MgO). The CPCM modules were electrically heated from the lower surface with a constant heat flux. Analyses of the temperature differences between the heated surface and CPCM modules suggested that, compared to the use of pure PCM, heat transfer in the CPCM modules be significantly enhanced due to the addition of graphite. Further experiments were done to investigate the discharging behaviour of the material modules under both natural convection and forced convection conditions. The results showed that the solidification process of CPCM modules were faster than that of pure PCM samples, evidenced by the fact that the solidification time of the CPCM modules was one third shorter than that of pure PCM modules.

Key words:  eutectic salt, phase change materials, composite energy storage materials, charging/ discharging behaviour