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

doi:10.12028/j.issn.2095-4239.2017.0067

Abstract

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

LI Chuan1, LI Qi2, JIANG Zhu1, CAO Hui1, QIAO Geng3, LI Yongliang1, LEI Xianzhang3, DING Yulong1. Charging and discharging behavior of carbonate-based salt composite phase change material modules[J]. Energy Storage Science and Technology, 2017, 6(4): 655-661.

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