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Analytical expression for circumferential and axial distribution of absorbed flux on a bent absorber tube of solar parabolic trough concentrator

机译：太阳能抛物槽式聚光器弯曲吸收管上吸收通量的周向和轴向分布的解析表达式

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摘要

A parabolic trough has a property to concentrate the incident rays at its focal line, when tracked appropriately. The flux distribution on the absorber tube is non-uniform. Part of the absorber's periphery facing the sun receives direct incident rays where as part of the other side receives concentrated rays resulting in circumferential non-uniform flux distribution. The intensity of flux also varies along the length of the absorber tube, especially at the sun facing end, depending upon the incidence angle of the sun rays and rim angle of the parabolic cylinder. Such non-uniformity in the flux distribution on the absorber tube leads to non-uniform temperature distribution. Thus the absorber experiences thermal stresses which may lead to bending of the tube thereby creating risk of glass cover damage. In order to estimate the extent of bending, study of the flux distribution is needed. In the present work, expression for the absorbed flux on a bent absorber tube accounting circumferential and axial variations is analytically derived. Optical errors and Gaussian sun shape have also been incorporated. Results have been plotted to study the effect of bending, optical errors and rim angle of the trough on flux distribution.
机译：当适当跟踪时，抛物线槽具有将入射光线聚集在其焦点处的特性。吸收管上的通量分布不均匀。吸收体面向太阳的外围的一部分接收直接入射的射线，而另一侧的一部分接收聚集的射线，从而导致周向的不均匀通量分布。通量的强度也沿着吸收管的长度变化，尤其是在朝太阳的端部，这取决于阳光的入射角和抛物柱面的边缘角。吸收器管上的通量分布的这种不均匀导致温度分布不均匀。因此，吸收器承受可能导致管弯曲的热应力，从而产生玻璃盖损坏的风险。为了估计弯曲程度，需要研究通量分布。在本工作中，通过解析得出了吸收器通量在弯曲吸收管上的表达式，该表达式考虑了周向和轴向变化。光学误差和高斯太阳形状也已被纳入。已经绘制了结果以研究弯曲，光学误差和槽的边缘角对通量分布的影响。

著录项

  • 来源
    《Solar Energy》 |2013年第6期|26-40|共15页
  • 作者

    Sourav Khanna; Shireesh B. Kedare; Suneet Singh;

  • 作者单位

    Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai, India;

    Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai, India;

    Department of Energy Science and Engineering, Indian Institute of Technology Bombay, Mumbai, India;

  • 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
  • 中图分类
  • 关键词

    Parabolic trough; Tubular receiver; Bending; Flux distribution; Optical errors; Gaussian sun shape;

    机译：抛物线槽管状接收器;弯曲;助焊剂分布;光学误差;高斯太阳形状;

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