Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
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Efficiency of a Direct Absorption Solar Collector using Ag Nanofluids Synthesized by Chemical Reduction Method

화학적 환원법으로 제조된 은나노유체를 사용한 직접흡수식 태양열 집열기의 효율

  • Lee, Seung-Hyun (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Park, Yong-Jun (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Choi, Tae Jong (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Jang, Seok Pil (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
  • 이승현 (한국항공대학교 항공우주 및 기계공학부) ;
  • 박용준 (한국항공대학교 항공우주 및 기계공학부) ;
  • 최태종 (한국항공대학교 항공우주 및 기계공학부) ;
  • 장석필 (한국항공대학교 항공우주 및 기계공학부)
  • Received : 2014.08.22
  • Accepted : 2014.10.20
  • Published : 2014.10.30
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Abstract

In this paper, the water-based Ag nanofluids are synthesized by the chemical reduction method and their extinction coefficients are measured by an in-house developed measurement device. The Ag nanofluids are manufactured by the chemical reduction method with the mixing of silver nitrate ($AgNO_3$) and sodium borohydride ($NaBH_4$) in an aqueous solution of polyvinyl pyrrolidone (PVP). The extinction coefficients of Ag nanofluids are measured by means of the in-house developed apparatus at a wavelength of 632.8nm according to the particle volume fractions. The results show that the extinction coefficient of water-based Ag nanofluids increases with the increase of nanoparticle concentrations. Finally, the temperature field and efficiency of direct absorption solar collector (DASC) are analytically estimated based on the measured extinction coefficient of water-based Ag nanofluids. The results indicate that the direct absorption solar collectors using nanofluids have the feasibility to improve the efficiency of conventional flat-plate solar collectors without using an absorber plate.

Keywords

References

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