Current Science

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Nanofluids have been studied since 1995 for their enormous thermal conductivity enhancement. Applications of nanofluids include electronic, automobile and nuclear reactor cooling. Nanofluids have also been explored as potential fluids for direct absorption solar collectors. In the present work, zinc oxide nanofluid (ZnO) has been synthesized by a two-step process without any surfactant. ZnO nanoparticles are characterized by XRD and SEM to reveal ZnO nanorods with average diameter and length of 50-500 nm. The stability of the nanofluid has been studied by zeta potential measurement for 0.1, 0.2, 0.3 and 0.4 wt%. ZnO/water nanofluid showed good solar absorption (12.2%) and can act as better solar absorbers like Ag nanofluids.

Keywords

Direct Absorption Solar Collector, Nanofluid, Solar Absorption, ZnO.
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