Preprint Article Version 1 This version is not peer-reviewed

Experimental Investigation of Freezing and Melting Characteristics Of Graphene Based Phase Change Nanocomposite for Cold Thermal Energy Storage Applications

Version 1 : Received: 15 January 2019 / Approved: 16 January 2019 / Online: 16 January 2019 (08:33:16 CET)

A peer-reviewed article of this Preprint also exists.

Sidney, S.; D., M.L.; C., S.; Harish, S. Experimental Investigation of Freezing and Melting Characteristics of Graphene-Based Phase Change Nanocomposite for Cold Thermal Energy Storage Applications. Appl. Sci. 2019, 9, 1099. Sidney, S.; D., M.L.; C., S.; Harish, S. Experimental Investigation of Freezing and Melting Characteristics of Graphene-Based Phase Change Nanocomposite for Cold Thermal Energy Storage Applications. Appl. Sci. 2019, 9, 1099.

Journal reference: Appl. Sci. 2019, 9, 1099
DOI: 10.3390/app9061099

Abstract

In the present work freezing and melting characteristics of water seeded with chemically functionalized graphene nano-platelets in a vertical cylindrical capsule was experimentally studied. The volume percentage of functionalized graphene nano-platelets was varied from 0.1% to 0.5% with an interval of 0.1%. The stability of the synthesised samples were carried out by zeta potential distribution. The thermal conductivity of the nanocomposite samples were experimentally measured using transient hot wire method. A maximum enhancement of ~24% in the thermal conductivity was observed for the 0.5% volume percentage in the liquid state while a ~53% enhancement in the solid state. Freezing and melting behaviour of water dispersed with graphene nanoplatelets were carried out using a cylindrical stainless steel capsule in a constant temperature bath. The bath temperatures considered for studying freezing characteristics were considered to be −6 °C and −10 °C, while to study the melting characteristics the bath temperature was set as 31 °C and 36 °C. The freezing and melting time decreased for all the test conditions when the volume percentage of GnP increased.  The freezing rate was enhanced by ~ 43% and ~32% for the bath temperatures of −6 °C and −10 °C respectively at 0.5 vol % of graphene loading. The melting rate was enhanced by ~42% and ~63% for the bath temperature of 31 °C and 36 °C respectively at 0.5 vol % of graphene loading.

Subject Areas

nanocomposite; melting; freezing; graphene; thermal conductivity

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