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Experimental study on performance improvement of U-tube solar collector depending on nanoparticle size and concentration of Al2O3 nanofluid

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  • Kim, Hyeongmin
  • Kim, Jinhyun
  • Cho, Honghyun

Abstract

In this study, the efficiency of a U-tube solar collector as a function of the concentration of Al2O3 nanofluid and the size of nanoparticles was investigated experimentally. Further, the efficiency of a U-tube solar collector with Al2O3 nanofluid as the working fluid was compared to that with water. The thermal conductivity of the Al2O3 nanofluid was found to increase with increase in its concentration and decrease in its nanoparticle size. When the inlet fluid and ambient environment are the same temperature, the solar collector with 1.0 vol% Al2O3 nanofluid of 20 nm-nanoparticles and a mass flow rate of 0.047 kg/s showed the highest efficiency, 24.1% higher than that of the solar collector with water. In addition, the efficiency of the solar collector with 1.0 vol% Al2O3 nanofluid was 5.6% and 9.7% higher than those with 1.5 vol% and 0.5 vol% nanofluid, respectively. For equal nanofluid concentrations, the maximum efficiency of the solar collector was 72.4% at the nanoparticle size of 20 nm–3.05% and 5.32% higher than those with nanoparticle sizes of 50 and 100 nm, respectively. Therefore, Al2O3 nanofluid was concluded to be effective in increasing the efficiency of the U-tube solar collector.

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  • Kim, Hyeongmin & Kim, Jinhyun & Cho, Honghyun, 2017. "Experimental study on performance improvement of U-tube solar collector depending on nanoparticle size and concentration of Al2O3 nanofluid," Energy, Elsevier, vol. 118(C), pages 1304-1312.
    • Handle: RePEc:eee:energy:v:118:y:2017:i:c:p:1304-1312
    DOI: 10.1016/j.energy.2016.11.009
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    18. Jacek Fal & Omid Mahian & Gaweł Żyła, 2018. "Nanofluids in the Service of High Voltage Transformers: Breakdown Properties of Transformer Oils with Nanoparticles, a Review," Energies, MDPI, vol. 11(11), pages 1-46, October.
    19. Choi, Tae Jong & Kim, Sung Hyoun & Jang, Seok Pil & Lin, Lingnan & Kedzierski, M.A., 2020. "Aqueous nanofluids containing paraffin-filled MWCNTs for improving effective specific heat and extinction coefficient," Energy, Elsevier, vol. 210(C).
    20. Gong, Jing-hu & Zhang, Zhi-peng & Sun, Zhi-hao & Wang, Yu-guang & Wang, Jun & Lund, Peter D., 2023. "Thermal and thermo-mechanical analysis of a novel pass-through all-glass evacuated collector tube by combining experiment with numerical simulation," Energy, Elsevier, vol. 277(C).
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    22. Woobin Kang & Yunchan Shin & Honghyun Cho, 2017. "Economic Analysis of Flat-Plate and U-Tube Solar Collectors Using an Al 2 O 3 Nanofluid," Energies, MDPI, vol. 10(11), pages 1-15, November.
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    25. Elsheikh, A.H. & Sharshir, S.W. & Mostafa, Mohamed E. & Essa, F.A. & Ahmed Ali, Mohamed Kamal, 2018. "Applications of nanofluids in solar energy: A review of recent advances," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 3483-3502.

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