Abstract
The present research work is to accomplish a comprehensivestudy on the improved freezing and meltingcharacteristics of a novelnanofluid as PCM. Nanofluid prepared in the present work consistsof oleic acid and Ni-ZnOnanocomposites (NCs), for cooling applications. Ni-ZnO NCs with mass fractions of 0.3, 0.6, 0.9 and 1.2wt% were suspended in oleic acid individually, for assessing the degree of thermal conductivity enhancement. The size and morphology of the as synthesized Ni-ZnONCs were studied by FESEM. Phase change properties of nanofluids for freezing and melting were ascertained by differential scanning calorimetry (DSC) measurements. An increase in thermal conductivity due to dispersion of NCswas ascertainedwith the help of laser flash analyzer (LFA). From the experimental results clearly indicate that time required for melting and freezing processes of nanofluids were lesserthan that of base fluid. Thus, the newly prepared nanofluid could be suggestedas one of the competent PCMs for cool energy storage systems.
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