Comparative study of optical and thermal model for a large-aperture parabolic trough concentrator with smaller diameter absorber tube bundle
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-11
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en
Pages
9
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Energy Reports, Volume 9, pp. 435-443
Abstract
Improving efficiency has always been the purpose of study on large-aperture parabolic trough solar concentrating power. This paper presents a novel design idea for absorber tube to improve efficiency, that is, a large diameter absorber tube was divided into smaller diameter absorber tube bundles, which was arranged in area of high solar flux density and used solar salt (60% KNO3 +40% NaNO3) as working fluid. Yield a 78.4%-optical and 74.8%-thermal efficiency at condition of and temperature= 400 ℃, and 7% and 8.5–9% higher than the traditional 80 mm diameter absorber tube system at temperature of 400–550 ℃, respectively. Moreover, the average surface temperature and max temperature of the smaller diameter absorber tube bundles decreases by 2 ℃ and 4 ℃ compared to traditional absorber tube, respectively. The use of new absorber tube bundle improves flow rate by reducing the hydraulic diameter, achieving the goal of improving transfer heat coefficient, reducing absorber tube surface temperature and improving thermal efficiency. But at the cost of improving the friction coefficient and pump consumption.Description
Funding Information: The work has been supported in part by the Qin-chuang-yuan Cited High-level Innovation and Entrepreneurship Talent project ( QCYRCXM-2022-326 ), 2023 Applied Technology R&D Reserve Project in Beilin District ( GX2322 ), School level scientific research project - Natural Science Cultivation Project (NO. X20220028 ), and Science Start-up Foundation of Xi'an University of Architecture and Technology (No. 1608722021 ). Publisher Copyright: © 2023 The Authors
Keywords
Absorber tube bundle, Large-aperture parabolic trough concentrator, Optical and thermal model, Solar thermal power
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Citation
Gong, J H, Yang, C, Wang, J & Lund, P D 2023, ' Comparative study of optical and thermal model for a large-aperture parabolic trough concentrator with smaller diameter absorber tube bundle ', Energy Reports, vol. 9, pp. 435-443 . https://doi.org/10.1016/j.egyr.2023.10.069