Photothermal Conversion Performance of Fe 3 O 4 /ATO Hybrid Nanofluid for Direct Absorption Solar Collector

Jeonggyun Ham, Hyemin Kim and Honghyun Cho ()
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Jeonggyun Ham: Department of Mechanical Engineering, Chosun University, 309 Pilmundaero, Dong-gu, Gwangju 61452, Republic of Korea
Hyemin Kim: Graduate School of Chosun University, Chosun University, 309 Pilmundaero, Dong-gu, Gwangju 61452, Republic of Korea
Honghyun Cho: Department of Mechanical Engineering, Chosun University, 309 Pilmundaero, Dong-gu, Gwangju 61452, Republic of Korea

Energies, 2024, vol. 17, issue 20, 1-14

Abstract: In order to enhance the efficiency of direct absorption solar collectors, this study carried out an experimental analysis about the optical and photothermal conversion performance of Fe 3 O 4 , ATO (Antimony-doped tin oxide), and Fe 3 O 4 /ATO nanofluids with a total concentration of 0.1 wt%. According to the results of the experiments, Fe 3 O 4 nanofluid outperforms ATO nanofluid in terms of optical absorption; nevertheless, at wavelengths shorter than 600 nm, it also shows significant scattering reflection. The solar-weighted absorption coefficient of Fe 3 O 4 /ATO nanofluid rose from 0.863 ( m F e 3 O 4 / m T o t a l = 0.2) to 0.932 ( m F e 3 O 4 / m T o t a l = 0.8) when the optical path length increased from 0.01 m to 0.06 m. Moreover, the Fe 3 O 4 /ATO hybrid nanofluid achieved a photothermal conversion efficiency of 0.932 when the mass ratio of Fe 3 O 4 to total mass was 0.2, surpassing the efficiencies of 0.892 and 0.898 recorded for 0.1 wt% ATO and Fe 3 O 4 nanofluids, respectively. When present together, the opposing optical characteristics of Fe 3 O 4 and ATO boost photothermal conversion performance, which is anticipated to raise the efficiency of direct absorption solar collectors.

Keywords: hybrid nanofluid; optical properties; solar weight absorption coefficient; photothermal conversion coefficient; direct absorption solar collector (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: 2024
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