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Characterization of a Nanofluid Volumetric Solar Absorber / Steam Generator

[+] Author Affiliations
Robert A. Taylor, Patrick Phelan, Ronald Adrian, Andrey Gunawan

Arizona State University, Tempe, AZ

Todd Otanicar

Loyola Marymount University, Los Angeles, CA

Paper No. ES2011-54062, pp. 1927-1936; 10 pages
  • ASME 2011 5th International Conference on Energy Sustainability
  • ASME 2011 5th International Conference on Energy Sustainability, Parts A, B, and C
  • Washington, DC, USA, August 7–10, 2011
  • ISBN: 978-0-7918-5468-6
  • Copyright © 2011 by ASME


Solar thermal energy has shown remarkable growth in recent years — incorporating many new technologies into new applications [1]. Nanofluids — suspensions of nanoparticles in conventional fluids — have shown promise to make efficient volumetric-absorption solar collectors [2–4]. It has also been shown that concentrated light energy can efficiently cause localized phase change in a nanofluid [5]. These findings indicate that it may be advantageous to create a ‘direct, volumetric nanofluid steam generator’. That is, a solar collector design which could minimize the number of energy transfer steps, and thus minimize losses in converting sunlight (via thermal energy) to electricity. To study this, we use a testing apparatus where concentrated laser light at 532 nm — a wavelength very near the solar spectrum peak — is incident on a highly absorbing sample. The highly absorbing samples compared in this study are black dyes, black painted surfaces, and silver nanofluids — with de-ionized water as a base fluid. Each of these samples converts light energy to heat — to varying degrees — in a localized region. This region is monitored simultaneously with a digital camera and an infrared camera. The resulting observed temperature profile and bubble dynamics are compared for these fluids. For pure water with a black backing, some very high temperatures (>300 °C) are observed with a laser input of ∼75 W/cm2 . Using a similar absorption potential, we observed higher temperatures in the nanofluids when compared to black dyes. A simplified boiling heat transfer analysis based on these results is also presented. We also noticed differences in bubble size and growth rates for the different samples. Overall, this study represents a proof-of-concept test for a novel volumetric, direct steam generator. These results of this test indicate that it may be possible to efficiently generate steam directly in a controlled, localized volume — i.e. without heating up passive system components.

Copyright © 2011 by ASME



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