1. Heat transfer, entropy generation, economic and environmental analyses of linear fresnel reflector using novel rGO-Co3O4 hybrid nanofluids.
- Author
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Said, Zafar, Ghodbane, Mokhtar, Sundar, L. Syam, Tiwari, Arun Kumar, Sheikholeslami, Mohsen, and Boumeddane, Boussad
- Subjects
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NANOFLUIDS , *HEAT transfer , *LINEAR statistical models , *HEAT transfer coefficient , *NUSSELT number , *CARBON dioxide - Abstract
This work aims to enhance the heat transfer of a small prototype linear Fresnel reflector by using rGO-Co 3 O 4 /water hybrid nanofluids at a location in Blida region, in Algeria. Hybrid nanofluids, with varying concentrations (0.05, 0.10, and 0.20 wt%) and temperatures (20–60 °C), are prepared. For 0.2 wt % of rGO-Co 3 O 4 nanofluids, the viscosity and density increased by 70.83%, and 0.47%, respectively, while the specific heat decreased by 0.17% at a temperature of 60 °C over the base fluid data. The receiver pipe energy balance equations are solved using MATLAB software. With the use of 0.2 wt% of hybrid nanofluid, the mean thermal efficiency enhanced by 2.75%–31.95%, the mean exergy efficiency improved by 23.67%–2.27%, and the mean temperature increased by 9.42 °C, while, the receiver pipe temperature decreased by 2.69 °C. In addition, the mean heat transfer coefficient, mean thermal conductivity, Nusselt number, and the performance evaluation criteria were improved by using rGO-Co 3 O 4 /water nanofluid at 0.2 wt % by 309.67%, 19.31%, 254.75%, and 240.92%, respectively, while the mean entropy generation and electrical energy consumption decreased by 59.48% and 20.30%, respectively, as the CO 2 emission mitigation was 253.94 kg. Image 1 • Stable rGo-Co 3 O 4 /Water hybrid nanofluids with excellent thermal properties was experimentally obtained. • Thermal conductivity increased by 19.14% at 0.2 wt% for 60 °C using hybrid nanofluids. • Thermal behavior of hybrid nanofluids was investigated in a small LFR. • LFR thermal efficiency enhanced by 2.75%–31.95% using rGo-Co 3 O 4 /Water with 0.20 wt %. • Mean performance evaluation criteria using rGo-Co 3 O 4 /Water with 0.20 wt % enhanced by 240.92%. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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