access icon free Experimental investigation of the effects of sonication time and volume concentration on the performance of PVT solar collector

© The Institution of Engineering and Technology
Received 09/09/2017, Accepted 06/07/2018, Published 25/07/2018

In this research, the effects of sonication time and volume concentration of cupric oxide (CuO)/water nanofluids on the thermal conductivity, viscosity and performance of photovoltaic–thermal (PVT) solar collector are investigated experimentally. Pure water, 0.05, 0.1 and 0.2% volume concentrations of CuO/water nanofluids prepared with 1, 2, 3 and 4 h sonication time are used as the heat transfer fluids in this study. The experimental results show that the thermal conductivity and viscosity of nanofluids are the functions of sonication time and volume concentration and using a 0.2 vol.% nanofluid prepared with 4 h sonication time, the thermal conductivity and viscosity were enhanced up to 3.5 and 7.5%, respectively, with respect to the base fluid, whereas for the same volume concentration and sonication time, the observed thermal and electrical efficiencies of the PVT solar collector are 80.7 and 15.1%, respectively, at 12 noon. It was observed that the highest total efficiency of the PVT solar collector of about 95.8% was obtained for 0.2% CuO/water nanofluid and 4 h sonication time at 12 noon.

Inspec keywords: viscosity; heat transfer; nanoparticles; solar absorber-convertors; thermal conductivity; viscometers; copper compounds; nanofluidics; water

Other keywords: electrical efficiencies; volume concentration; thermal efficiencies; viscosity; photovoltaic–thermal solar collector; time 3.0 hour; outdoor condition; time 1.0 hour; time 4.0 hour; sonication time; size 7.0 am; thermal conductivity; PVT solar collector; heat transfer fluids; CuO; time 2.0 hour; volume concentrations; prepared cupric oxide/water nanofluids

Subjects: Applied fluid mechanics; Microfluidics and nanofluidics; Convection and heat transfer; Photothermal conversion

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