A Novel Solid-Solid Phase Change Material: Pentaglycerine/Expanded Graphite Composite PCMs

作者：Zhang, Nan; Song, Yanlin; Du, Yanxia^*; Yuan, Yanping^*; Xiao, Guangming; Gui, Yewei

来源：Advanced Engineering Materials, 2018, 20(10): 1800237.

DOI：10.1002/adem.201800237

• expanded graphite
• pentaglycerine
• solid-solid phase change materials
• thermal conductivity enhancement
• thermal energy storage

In this work, a novel solid-solid phase change material (SS-PCM), pentaglycerine/expanded graphite (PG/ExG) is developed. ExG is introduced into PG to enhance its thermophysical properties. The results of SEM, FT-IR, and XRD indicate that PG and ExG are physically well combined in the composites. DSC results show that the phase change temperature of the PG/ExGs are not significantly different from those of PG. The melting latent heat of PG/ExG containing 1, 2, and 4wt% ExG are 163.8, 161.6, and 160.1Jg(-1), respectively. Although the latent heat of PG/ExG decreases with the addition of ExG, the total heat storage capacity of PG/ExG increases due to the increase in specific heat of composite PCMs. The thermal conductivities of PG/ExG containing 1, 2, and 4wt% ExG are 0.647W/(m<bold>K</bold>), 0.863W/(m<bold>K</bold>), and 0.944W/(m<bold>K</bold>), respectively, while that of PG is just 0.232W/(m<bold>K</bold>). Thermal performance tests further verify the enhancement to heat transfer performance of PG with ExG. The results of thermal cycling tests substantially indicate that the PG-based SS-PCMs have noticeable thermal reliabilities after 100 cycles. In conclusion, the PG/ExG composite PCMs with comprehensive properties will have potential for usage in energy storage and thermal management systems.

• 出版日期2018-10
• 单位中国空气动力研究与发展中心; 西南交通大学