Fabrication and properties of novel tubular carbon fiber-ionic liquids/stearic acid composite PCMs

Xiangguo Zhang, Yuqing Li, Chunhuan Luo and Chongchao Pan

Renewable Energy, 2021, vol. 177, issue C, 411-421

Abstract: In this work, novel tubular carbon fiber-ionic liquids/stearic acid (CF-ILs/SA) composite phase change materials (PCMs) were proposed and fabricated with a centrifugal method at different spinning speeds. Polydimethylsiloxane (PDMS) films were used to modify the surfaces of composite PCMs for a good package. Excellent eutectic systems of SA and ILs including C15H22N2O3S and C12H16N2O3S were produced to adjust the phase change behavior of SA. Properties and stabilities of the CF-ILs/SA (ILs:SA = 1:3) composite PCMs were further investigated. Results showed that the materials fabricated at a lower rotation speed possessed a larger latent heat because of a higher loading of the ILs/SA PCMs. The latent heat of CF-C12H16N2O3S/SA at 1800 r/min was 77.83 kJ/kg, and slightly decreased to 74.56 kJ/kg after 200 thermal cycles, which was superior to that of CF-C15H22N2O3S/SA. Compared to pure SA, the thermal conductivities of the CF-ILs/SA were greatly enhanced and the values were 0.79 W/(m·K) and 1.02 W/(m·K) for CF-C12H16N2O3S/SA and CF-C15H22N2O3S/SA, respectively. These CF-ILs/SA composite PCMs had satisfactory thermal stability below 200 °C and outstanding mechanical stability with an axial yield stress of 19.0 MPa. These tubular CF-ILs/SA composite PCMs show high potential in practical applications, such as in solar energy utilization and waste heat recovery.

Keywords: Phase change materials; Carbon fiber; Ionic liquids; Thermophysical properties; Stability (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:177:y:2021:i:c:p:411-421

DOI: 10.1016/j.renene.2021.05.109

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