Comprehensive Experimental Study on the Thermophysical Characteristics of DI Water Based Co 0.5 Zn 0.5 Fe 2 O 4 Nanofluid for Solar Thermal Harvesting

Tsogtbilegt Boldoo, Jeonggyun Ham and Honghyun Cho
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Tsogtbilegt Boldoo: Department of Mechanical Engineering, Chosun University, Gwangju 61452, Korea
Jeonggyun Ham: Department of Mechanical Engineering, Chosun University, Gwangju 61452, Korea
Honghyun Cho: Department of Mechanical Engineering, Chosun University, Gwangju 61452, Korea

Energies, 2020, vol. 13, issue 23, 1-17

Abstract: The thermophysical properties of water-based Co 0.5 Zn 0.5 Fe 2 O 4 magnetic nanofluid were investigated experimentally. Consequently, the viscosities of 0.25 wt% and 1 wt% Co 0.5 Zn 0.5 Fe 2 O 4 nanofluid were 1.03 mPa?s and 1.13 mPa?s, each greater than that of the 20 °C base fluid (water), which were increased by 7.3% and 17.7%, respectively. The Co 0.5 Zn 0.5 Fe 2 O 4 nanofluid thermal conductivity enhanced from 0.605 and 0.618 to 0.654 and 0.693 W/m·°C at concentrations of 0.25 wt% and 1 wt%, respectively, when the temperature increased from 20 to 50 °C. The maximum thermal conductivity of the Co 0.5 Zn 0.5 Fe 2 O 4 nanofluid was 0.693 W/m·°C at a concentration of 1 wt% and a temperature of 50 °C. Furthermore, following a solar exposure of 120 min, the photothermal energy conversion efficiency of 0.25 wt%, 0.5 wt%, 0.75 wt%, and 1 wt% Co 0.5 Zn 0.5 Fe 2 O 4 nanofluids increased by 4.8%, 5.6%, 7.1%, and 4.1%, respectively, more than that of water.

Keywords: Co 0.5 Zn 0.5 Fe 2 O 4 nanofluid; cobalt-zinc ferrite; thermal conductivity; PTEC (photothermal energy conversion) efficiency; optical absorption; viscosity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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