Effect of expanded graphite on the melting and solidification of paraffin in cage-drawer water tank

doi:10.19799/j.cnki.2095-4239.2020.0257

Abstract

Abstract:

To study the effect of expanded graphite on the melting and solidification properties of paraffin wax, the solidification and melting process of expanded graphite paraffin wax composite phase change heat storage material was numerically simulated and compared with that of pure paraffin wax phase change heat storage material. The effects of a different content of expanded graphite and a different wall temperature on the melting and solidification process of paraffin wax were analyzed. The results show that the addition of expanded graphite to paraffin wax can obviously shorten the solidification and melting time of the paraffin wax, and the melting and solidification time decreases with the increase of the expanded graphite content. Under the same working conditions, compared with pure paraffin, the melting times of composite paraffin with 1%, 2%, and 5% expanded graphite were reduced by 2.14, 2.81 and 9.74 times, respectively, and the solidification time was reduced by 0.77, 1.05, and 3.76 times, respectively. The wall temperature has a significant effect on the melting process of composite paraffin but not on the solidification process. When the initial temperature is the same, compared with the melting time of 5% EG composite paraffin wax under the wall temperature of 327° K, when the wall temperature is 332° K and 337° K, the melting time of 5% EG composite paraffin wax is shortened by 0.83 and 1.58 times, respectively.

Key words: compound phase change paraffin, liquid phase rate, melting process, solidification process, numerical simulation

CLC Number:

TK 02

Tingting DENG, Yingling CAI. Effect of expanded graphite on the melting and solidification of paraffin in cage-drawer water tank[J]. Energy Storage Science and Technology, 2021, 10(1): 190-197.

Figures/Tables 11

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参数	纯石蜡	1%EG	2%EG	5%EG
导热系数/W·(m·K)^-1	0.2964	0.3912	0.6135	1.0611
相变潜热值/kJ·kg^-1	174.6	172.9	171.9	165.9
凝固温度/K	326	322	322	321
熔化温度/K	327	323.95	323.2	322
密度/kg·m^-3	900	900	800	600
比热容/kJ·(kg·K^-1)	3.220	3.220	3.220	3.220

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