Performance analysis of direct absorption-based parabolic trough solar collector using hybrid nanofluids
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(2020) 42:573
TECHNICAL PAPER
Performance analysis of direct absorption‑based parabolic trough solar collector using hybrid nanofluids Atisham Khalil1 · Muhammad Amjad1 · Fahad Noor1 · Amjad Hussain2 · Saad Nawaz1 · Enio P. Bandarra Filho3 · Xiaoze Du4 Received: 30 May 2020 / Accepted: 28 September 2020 © The Brazilian Society of Mechanical Sciences and Engineering 2020
Abstract Addition of a small amount of nanoparticles to the working fluids of a parabolic trough collector does not only enhance the heat transfer properties and thermal conductivity of basefluid but also improves the thermal efficiency of the system. The current investigation presents a comparative analysis of experimental performance of a conventional parabolic trough collector and direct absorption parabolic trough collector for capturing solar thermal energy. Two separate nanomaterials, Al2O3 (with high scattering properties) and CuO (with high absorption properties), were selected for the preparation of the hybrid nanofluids. A customized experimental setup was developed to evaluate their photothermal performance. The nanofluid samples in the concentration range of 0.01–0.5 wt% were investigated under a natural solar flux. Thermal efficiency of conventional parabolic trough collector was increased by 31% using hybrid nanofluid as compared to basefluid. The thermal efficiency enhancement of direct absorption parabolic trough collector was observed as 19% higher than that of conventional parabolic trough collector due to higher heat transfer rate, solar trapping and volumetric absorption. These binary nanofluids can be potential working fluids in various applications based on solar thermal energy. Keywords Parabolic trough collector · Hybrid nanofluids · Photothermal · Direct solar absorption · Efficiency enhancement Abbreviations PTC Parabolic trough collector CPTC Conventional parabolic trough collector Technical Editor: Jader Barbosa. This article has been selected for a Topical Issue of this journal on Nanoparticles and Passive-Enhancement Methods in Energy. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s40430-020-02654-2) contains supplementary material, which is available to authorized users. * Muhammad Amjad [email protected] 1
Department of Mechanical, Mechatronics and Manufacturing Engineering, New Campus, University of Engineering and Technology, Lahore, Lahore, Pakistan
2
Department of Industrial and Manufacturing Engineering, University of Engineering and Technology, Lahore, Lahore, Pakistan
3
School of Mechanical Engineering, Federal University of Uberlandia (UFU), Uberlândia, Brazil
4
School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, China
DAPTC Direct absorption parabolic trough collector MWCNT Multiwalled carbon nanotubes NPs Nanoparticles NF Nanofluid HTFs Heat transfer fluids List of symbols Aap Area of the aperture (m2) Cp Specific heat (J/kg K) G Solar irradiance flux (W/m2) CR Concentrat
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