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Optical losses due to tracking error estimation for a low concentrating solar collector

机译：低浓度太阳能集热器的跟踪误差估算导致的光损耗

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摘要

The determination of the accuracy of a solar tracker used in domestic hot water solar collectors is not yet standardized. However, while using optical concentration devices, it is important to use a solar tracker with adequate precision with regard to the specific optical concentration factor. Otherwise, the concentrator would sustain high optical losses due to the inadequate focusing of the solar radiation onto its receiver, despite having a good quality. This study is focused on the estimation of long-term optical losses due to the tracking error of a low-temperature collector using low-concentration optics. For this purpose, a testing procedure for the incidence angle modifier on the tracking plane is proposed to determinate the acceptance angle of its concentrator even with different longitudinal incidence angles along the focal line plane. Then, the impact of maximum tracking error angle upon the optical efficiency has been determined. Finally, the calculation of the long-term optical error due to the tracking errors, using the design angular tracking error declared by the manufacturer, is carried out. The maximum tracking error calculated for this collector imply an optical loss of about 8.5%, which is high, but the average long-term optical loss calculated for one year was about 1%, which is reasonable for such collectors used for domestic hot water.
机译：用于家用热水太阳能集热器的太阳能跟踪器的准确性的确定尚未标准化。但是，在使用光学聚光装置时，重要的是使用关于特定光学聚光系数的足够精度的太阳能跟踪器。否则，尽管太阳辐射器的质量很好，但由于太阳辐射不能充分聚焦到其接收器上，因此该聚光器将承受较高的光损耗。这项研究的重点是使用低浓度光学器件估算由于低温收集器的跟踪误差引起的长期光学损耗。为此目的，提出了一种用于跟踪平面上的入射角修正器的测试程序，以确定其聚光器的接收角，即使沿焦平面具有不同的纵向入射角也是如此。然后，确定了最大跟踪误差角对光学效率的影响。最后，使用制造商声明的设计角度跟踪误差，对由于跟踪误差引起的长期光学误差进行了计算。计算出的该收集器的最大跟踪误差意味着大约为8.5％的光学损耗，这是很高的，但是一年计算的平均长期光学损耗约为1％，这对于用于生活热水的此类收集器是合理的。

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  • 来源
    《Energy Conversion & Management》 |2015年第3期|194-206|共13页
  • 作者

    Fabienne Sallaberry; Alberto Garcia de Jalon; Jose-Luis Torres; Ramon Pujol-Nadal;

  • 作者单位

    CENER (National Renewable Energy Center), Solar Thermal Energy Department, C/Ciudad de la Innovacion, 7, 31621 Sarriguren, Navarra, Spain;

    CENER (National Renewable Energy Center), Solar Thermal Energy Department, C/Ciudad de la Innovacion, 7, 31621 Sarriguren, Navarra, Spain;

    Public University of Navarra (UPNA), Projects and Rural Engineering Department, Campus Arrosadia s, 31006 Pamplona, Navarra, Spain;

    University of Balearic Islands, Physics Department, Ctra. Valldemossa km 7.5, 07122 Palma de Mallorca, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Collector testing; Solar concentrator; One-axis tracking; Optical losses;

    机译：收集器测试;太阳能集中器;单轴跟踪;光损耗;

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