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Performance Evaluation of a Modified Compound Parabolic Concentrating Collector with Varying Concentration Ratio

机译：改性化合物抛物线浓缩集电极具有不同浓度比的性能评价

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摘要

Thermosyphon based evacuated tube solar collectors have seen exponential growth in the last few decades for domestic hot water applications. The output temperatures of such collectors can be increased by integrating evacuated tube receivers with compound parabolic concentrators (CPCs) to meet many industrial heat loads. This paper presents a new concept of increasing concentration of solar radiation along the length of an evacuated tube receiver coupled with a modified CPC with 52.5° and 38.5° acceptance half-angles at the inlet and outlet sides respectively. The effect of varying concentration ratio in the longitudinal direction is analyzed in terms of increasing heat flux and temperature gradient between the inlet and outlet of the receiver. Monte Carlo ray-tracing analysis confirmed a gradual increase of power density along the length of the receiver paired with the modified CPC. The daily average energy collection by the modified CPC was comparable with that of equal aperture area CPC with a fixed concentration ratio along its length. The experimental results demonstrated about a 15% higher temperature gradient in the case of CPC with a varying concentration ratio as compared to equal aperture area CPC with a fixed concentration ratio single-phase thermosyphon flow.
机译：基于热旋流基的抽空管太阳能收集器在过去的几十年里看到了国内热水应用的指数增长。通过将抽空管接收器与复合抛物线集中器（CPC）集成到满足许多工业热负荷，可以增加这种收集器的输出温度。本文呈现了沿着耦合的被改变的CPC的抽空管接收器的长度增加了太阳辐射浓度的新概念，分别在入口和出口侧的52.5°和38.5°接受半角。在增加接收器的入口和出口之间的热通量和温度梯度方面，分析了纵向变化浓度比的效果。蒙特卡洛射线跟踪分析证实沿接收器的长度与改进的CPC配对的长度逐渐增加。经修饰的CPC的每日平均能量收集与沿其长度的固定浓度比的相同孔径区域CPC相当。实验结果在与具有固定浓度比单相热脊柱流量的相应浓度比单相热烃流相比，CPC具有不同浓度比的CPC的较高温度梯度约为15％的温度梯度。

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  • 来源
    《Heat Transfer Engineering》 |2021年第14期|1117-1131|共15页
  • 作者

    Javed Akhter; Syed I.Gilani; Hussain H.Al-Kayiem; Muzaffar Ali;

  • 作者单位

    Mechanical Engineering Department Universiti Teknologi PETRONAS 32610 Seri Iskandar Perak Darul Ridzuan Malaysia Faculty of Mechanical and Aeronautical Engineering University of Engineering and Technology Taxila Rawalpindi Pakistan;

    Mechanical Engineering Department Universiti Teknologi PETRONAS 32610 Seri Iskandar Perak Darul Ridzuan Malaysia;

    Mechanical Engineering Department Universiti Teknologi PETRONAS 32610 Seri Iskandar Perak Darul Ridzuan Malaysia;

    Faculty of Mechanical and Aeronautical Engineering University of Engineering and Technology Taxila Rawalpindi Pakistan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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