Abstract
The effect of functionalization of graphene nanoplatelets (GNP) on the elimination of surfactant during the preparation of nano-enhanced phase change material (NEPCM) for the cool thermal energy storage system (CTES) were studied experimentally. Two different groups of NEPCMs were prepared by dispersing GNP + Sodium dodecylbenzene-sulfonate (SDBS) and functionalized GNP (FGNP) with DI water in various mass fractions namely 0.75 %, 0.50 %, and 0.25 %. It was found that the NEPCM with FGNP (without SDBS) shows good stability (−52 mV) even after repeated charging and discharging processes. The maximum enhancement in thermal conductivity of 50 % in the solid-state and 15 % in the liquid phase is recorded for NEPCM with FGNP. The NEPCM with 0.75 % FGNP shows the maximum contact-angle reduction of 43 % (49.2°) owing to the enhancement in the hydrophilic nature of NEPCMs with increased surface-active sites. The minimal reduction of latent heat of NEPCM with FGNP is recorded (4 %) as compared to NEPCM with GNP + SDBS (16 %) during discharging. In addition, the capacity/size of the CTES system predominantly depends on the latent heat (storage density) of the PCM used. The CTES system with higher energy storage density can be achieved through the selection of NEPCM dispersed with functionalized GNP.
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