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A Novel Solid–Solid Phase Change Material: Pentaglycerine/Expanded Graphite Composite PCMs
Author(s) -
Zhang Nan,
Song Yanlin,
Du Yanxia,
Yuan Yanping,
Xiao Guangming,
Gui Yewei
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800237
Subject(s) - materials science , composite number , graphite , phase change material , latent heat , composite material , nuclear chemistry , chemical engineering , thermal , thermodynamics , chemistry , physics , engineering
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 4 wt% ExG are 163.8, 161.6, and 160.1 J g −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 4 wt% ExG are 0.647 W/(m · K), 0.863 W/(m · K), and 0.944 W/(m · K), respectively, while that of PG is just 0.232 W/(m · K). 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.