Sensitivity analysis of a parabolic trough concentrator with linear V‐shape cavity,Energy Science & Engineering

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Sensitivity analysis of a parabolic trough concentrator with linear V‐shape cavity
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-06-17 , DOI: 10.1002/ese3.763
Alireza Rafiei ₁ , Reyhaneh Loni ₂ , Mohammad Hossein Ahmadi ₃ , Gholamhassan Najafi ₂ , Evangelos Bellos ₄ , Fatemeh Rajaee ₅ , Ezzatollah Askari Asli‐Ardeh ₆

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In the present investigation, a solar parabolic trough concentrator (PTC) with a linear cavity was examined by using a developed numerical model. More specifically, a V‐shape cavity receiver was studied in this work as a new and alternative design. The use of a cavity in a PTC is a very promising idea because it leads to high efficiency and to low investment cost. Up today, the emphasis in the use of cavities is given in dish concentrators and so there is a need for investigation of cavities also in linear concentrators. Different dimensional and operational parameters of the PTC with a V‐shape cavity were considered. More specifically, the position, aperture area, and the tube diameter of the V‐shape cavity, solar irradiance, inlet temperature level, and mass flow rate were evaluated based on sensitivity analysis. The results revealed that the highest optical performance was attained when the cavity was placed at the PTC focal line. Moreover, it is found that there is an optimum cavity aperture area to determine the greatest thermal efficiency. For the optical errors of 5, 10, 15, 20, and 35 mrad, the optimum cavity aperture wide was calculated at 5, 5, 6, 7, and 8 cm, respectively, with the tracking error to be 0°. The highest thermal performance has found when the collector operates with low inlet temperature, high flow rate, high solar irradiation level, and small cavity tube diameter.

中文翻译：

线性V型腔抛物槽式选矿机的灵敏度分析

在本研究中，通过使用开发的数值模型检查了具有线性腔的太阳能抛物槽式聚光器（PTC）。更具体地说，在这项工作中，研究了V型腔接收器作为一种新的替代设计。在PTC中使用空腔是一个非常有前途的想法，因为它可以提高效率并降低投资成本。直到今天，在碗碟浓缩器中都强调了空腔的使用，因此也需要对线性浓缩器中的空腔进行研究。考虑了带有V型腔的PTC的不同尺寸和运行参数。更具体地说，基于灵敏度分析评估了V型腔的位置，孔径面积和管直径，太阳辐照度，入口温度水平以及质量流率。结果表明，将腔体放置在PTC焦点线上可获得最高的光学性能。此外，发现存在最佳的腔孔面积以确定最大的热效率。对于5、10、15、20和35毫拉德的光学误差，分别在5、5、6、7和8 cm处计算出最佳腔孔径宽度，跟踪误差为0°。当集热器在低入口温度，高流速，高太阳辐射水平和小腔管直径的情况下运行时，将获得最高的热性能。计算出的最佳腔孔径分别为5、5、6、7和8 cm，跟踪误差为0°。当集热器在低入口温度，高流速，高太阳辐射水平和小腔管直径的情况下运行时，将获得最高的热性能。计算出的最佳腔孔径分别为5、5、6、7和8 cm，跟踪误差为0°。当集热器在低入口温度，高流速，高太阳辐射水平和小腔管直径的情况下运行时，将获得最高的热性能。

更新日期：2020-06-17

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