Title: Evaluation on the photothermal conversion performance of SiC nanofluid for a direct absorption solar collector

Authors: Hyemin Kim; Jeonggyun Ham; Honghyun Cho

Addresses: Department of Mechanical Engineering, Graduate School of Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju 61452, South Korea ' Department of Mechanical Engineering, Graduate School of Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju 61452, South Korea ' Department of Mechanical Engineering, Chosun University, 309 Pilmundaero, Dong-Gu, Gwangju 61452, South Korea

Abstract: In this study, the application possibility of SiC nanofluid in direct absorption solar collectors (DASCs), the dispersion stability, light absorption characteristics, and photothermal conversion performance of SiC nanofluid were experimentally investigated. In particular, the dispersion stability of SiC nanofluid according to pH concentration and the type of surfactant was evaluated using light transmittance. As a result, it was confirmed that the SiC nanofluid had the highest dispersion stability when the pH concentration was 7 and the PVP surfactant was used. Also, when the light transmittance was decreased with the increase in the extinction coefficient of light when the concentration of SiC nanofluid increased from 0.001vol% to 0.005vol%. However, even though the light absorption increased with increasing concentration, the photothermal conversion efficiency reached the critical value at 0.004vol%, and decreased at 0.005vol%. The photothermal conversion efficiency of the 0.004vol%-SiC nanofluid was improved by 81.6% compared to that of water.

Keywords: solar energy; DASC; direct absorption solar collector; SiC nanofluid; dispersion stability; photothermal conversion performance.

DOI: 10.1504/IJNT.2022.122364

International Journal of Nanotechnology, 2022 Vol.19 No.1, pp.28 - 35

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 16 Apr 2022 *

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