Dispersing trace amounts of nanoparticles into common base-fluids has a significant impact on the optical as well as thermophysical properties of the base-fluid. This characteristic can be utilized to effectively capture and transport solar radiation. Enhancement of the solar irradiance absorption capacity leads to a higher heat transfer rate resulting in more efficient heat transfer. This paper attempts to introduce the idea of harvesting solar radiant energy through usage of nanofluid-based concentrating parabolic solar collectors (NCPSC). In order to theoretically analyze the NCPSC, it has been mathematically modeled, and the governing equations have been numerically solved using finite difference technique. The results of the model were compared with the experimental results of conventional concentrating parabolic solar collectors under similar conditions. It was observed that while maintaining the same external conditions (such as ambient/inlet temperatures, wind speed, solar insolation, flow rate, concentration ratio, etc.) the NCPSC has about 5–10% higher efficiency as compared to the conventional parabolic solar collector. Furthermore, parametric studies were carried out to discover the influence of various parameters on performance and efficiency. The following parameters were studied in the present study: solar insolation, incident angle, and the convective heat transfer coefficient. The theoretical results clearly indicate that the NCPSC has the potential to harness solar radiant energy more efficiently than a conventional parabolic trough.
Solar Energy Harvesting Using Nanofluids-Based Concentrating Solar Collector
Paper presented at the 2012 3rd Micro/Nanoscale Heat & Mass Transfer International Conference (MNHMT2012), Atlanta, GA, Mar. 3–6, 2012. Manuscript received March 12, 2012; final manuscript received August 10, 2012; published online January 18, 2013. Assoc. Editor: Debjyoti Banerjee.
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Khullar, V., Tyagi, H., Phelan, P. E., Otanicar, T. P., Singh, H., and Taylor, R. A. (January 18, 2013). "Solar Energy Harvesting Using Nanofluids-Based Concentrating Solar Collector." ASME. J. Nanotechnol. Eng. Med. August 2012; 3(3): 031003. https://doi.org/10.1115/1.4007387
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