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Solar-thermal conversion performance of heterogeneous nanofluids

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  • Chen, Xingyu
  • Chen, Meijie
  • Zhou, Ping

Abstract

Nanofluids have excellent optical and thermal properties and show great potential for applications in direct absorption solar collectors (DASCs). However, due to the preparation process or force interaction, the non-uniform distribution of NP radii (r) and volume fraction (fv) in heterogeneous nanofluids may affect the solar-thermal conversion performance. In this work, we established a multiscale model based on the finite element method (FEM) coupled with the Monte Carlo (MC) method to investigate the solar-thermal conversion performance of heterogeneous nanofluids. Results show that the non-uniform distribution of r has little effect on the solar-thermal conversion performance due to the weak scattering and strong absorption properties of NPs in dilute nanofluids. The non-uniform distribution of fv has great effect on the local heating flux distribution in the heterogeneous nanofluid, which would affect the collector efficiency (ηcol) due to the different surface heat losses. And a superior ηcol can be achieved at a downward-gradient distribution of r and fv compared with uniform or upward-gradient distributions. This work develops an effective method to evaluate the solar-thermal conversion performance of heterogeneous nanofluids and provides a promising strategy by tuning the distribution of r and fv to enhance the solar collector performance.

Suggested Citation

  • Chen, Xingyu & Chen, Meijie & Zhou, Ping, 2022. "Solar-thermal conversion performance of heterogeneous nanofluids," Renewable Energy, Elsevier, vol. 198(C), pages 1307-1317.
    • Handle: RePEc:eee:renene:v:198:y:2022:i:c:p:1307-1317
    DOI: 10.1016/j.renene.2022.08.065
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    References listed on IDEAS

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    1. Goel, Nipun & Taylor, Robert A. & Otanicar, Todd, 2020. "A review of nanofluid-based direct absorption solar collectors: Design considerations and experiments with hybrid PV/Thermal and direct steam generation collectors," Renewable Energy, Elsevier, vol. 145(C), pages 903-913.
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    1. Wagd Ajeeb & S. M. Sohel Murshed, 2023. "Characterization of Thermophysical and Electrical Properties of SiC and BN Nanofluids," Energies, MDPI, vol. 16(9), pages 1-13, April.

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