Harmonizing green energy: enhancing parabolic trough solar collectors through numerical optimization, twisted tapes, and nanofluids, with an environmental perspective

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL
M. H. Pahlavanian, A. M. Jadidi, Mohammad Zaboli, Seyfolah Saedodin
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Abstract

In this paper, a parabolic trough solar collector with variable heat flux depending on various twisted tapes as a swirl generator with cerium oxide, copper oxide, and multi-walled carbon nanotubes nanofluids with different volume fractions is presented. First, the impact of different twisted tapes is discussed, and the next part analyzes the influence of different volume fractions of nanofluids on improving the outlet temperature and the heat transfer coefficient. Finally, the best volume fraction of these nanofluids is used to form the hybrid nanofluid, and its effect on the turbulence thermal efficiency is numerically assessed. The obtained outcomes indicate that using a quadruple twisted tape improves the rate of heat transfer because it induces more rotational flow compared to other cases. Moreover, hybrid nanofluids of cerium oxide/copper oxide with a 2% volume fraction demonstrated the most increased thermal efficiency. Furthermore, to facilitate a broader utilization of the results, a precise relationship for the pressure drop and heat transfer coefficient in relation to alterations in terms of geometry, fluid velocity, and thermophysical properties obtained through statistical analysis is provided. Additionally, the assessed parabolic trough solar collector and a water heater with a capacity of 18,000 kcal/h were compared to evaluate the reduction in greenhouse gas emissions.

Abstract Image

协调绿色能源:从环境角度出发,通过数值优化、扭曲带和纳米流体改进抛物槽式太阳能集热器
本文介绍了一种抛物面槽式太阳能集热器,该集热器具有可变热通量,取决于作为漩涡发生器的各种扭曲带,以及不同体积分数的氧化铈、氧化铜和多壁碳纳米管纳米流体。首先讨论了不同扭曲带的影响,接下来分析了不同体积分数的纳米流体对提高出口温度和传热系数的影响。最后,使用这些纳米流体的最佳体积分数形成混合纳米流体,并对其对湍流热效率的影响进行数值评估。结果表明,与其他情况相比,使用四重扭曲带可提高热传导率,因为它能引起更多的旋转流。此外,体积分数为 2% 的氧化铈/氧化铜混合纳米流体的热效率增幅最大。此外,为了便于更广泛地利用研究结果,还提供了通过统计分析获得的压降和传热系数与几何形状、流体速度和热物理性质变化之间的精确关系。此外,还对所评估的抛物面槽式太阳能集热器和容量为 18,000 kcal/h 的热水器进行了比较,以评估温室气体排放量的减少情况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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