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首页> 外文期刊>Solar Energy >Explicit expressions for temperature distribution and deflection in absorber tube of solar parabolic trough concentrator
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Explicit expressions for temperature distribution and deflection in absorber tube of solar parabolic trough concentrator

机译：太阳能抛物线槽聚光器吸收管温度分布和挠度的明确表示。

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摘要

The portion of absorber tube of parabolic trough, facing the reflector, receives concentrated rays and the portion facing the sun receives direct incident rays resulting in circumferential non-uniform flux distribution. It leads to circumferential non-uniformity in the temperature of absorber tube. Thus, the absorber tube experiences differential expansion that results in tension and compression in its different parts leading to bending of the tube. Using the distribution of solar flux on the absorber tube incorporating the effects of Gaussian sun shape and optical errors, explicit expressions for finding the absorber's temperature distribution and corresponding deflection in the central axis of absorber tube (from the focal line of trough) are derived in the current work. Deflection due to the weight of the absorber tube is also accounted. The absorber tube is considered to be supported at its ends. To allow the absorber tube to elongate freely, supports are chosen such that they can move axially. Two types of conditions are considered: (i) the ends of absorber tube are allowed to rotate in the planes passing through focal line of the trough and (ii) rotation is not allowed. Keeping solar radiation, ambient conditions, receiver's dimensions, trough's aperture width, fluid and material's properties of absorber tube fixed, calculations have been carried out to study the effects of desired rise in fluid temperature, optical errors and rim angle of trough on absorber's temperature distribution and deflection in the absorber tube. For the chosen system dimensions, fluid's properties and absorber's material, as fluid's temperature rise increases from 0.1 degrees C/m (averaged over the receiver's length) to 0.5 degrees C/m, the maximum circumferential difference in absorber's temperature increases from 9 degrees C to 23 degrees C and the maximum deflection increases from -5.9 mm to -13.7 mm (positive and negative signs indicate deflections away and towards the vertex line of the trough respectively). As optical errors increase from 0 mrad to 20 mrad, the maximum circumferential difference in absorber's temperature decreases from 14 degrees C to 11 degrees C and the maximum deflection decreases from -8.8 mm to -7.2 mm. As rim angle increases from 60 degrees to 140 degrees, the maximum circumferential difference in absorber's temperature decreases from 16 degrees C to 7 degrees C and the maximum deflection decreases from -9.0 mm to -1.7 mm. (C) 2015 Elsevier Ltd. All rights reserved.
机译：抛物线槽的吸收器管的面对反射器的部分接收集中的射线，而面对太阳的部分接收直接的入射射线，从而导致周向的不均匀通量分布。这导致吸收器管的温度在周向上不均匀。因此，吸收器管经历不同的膨胀，这导致吸收器管的不同部分中的拉伸和压缩，从而导致管的弯曲。利用吸收器管上的太阳通量分布，结合高斯太阳形状和光学误差的影响，得出了用于确定吸收器温度分布和吸收器管中心轴上相应挠度的明确表达式（根据槽的焦线）。当前的工作。还考虑了由于吸收管的重量引起的挠曲。吸收器管被认为在其端部被支撑。为了使吸收器管自由伸长，选择支撑件以使其能够轴向移动。考虑了两种类型的条件：（i）允许吸收管的端部在穿过水槽焦线的平面内旋转，以及（ii）不允许旋转。保持太阳辐射，环境条件，接收器尺寸，槽的孔径宽度，吸收器管的流体和材料特性固定不变，已进行了计算以研究所需的流体温度升高，光学误差和槽的边缘角度对吸收器温度分布的影响和吸收管中的偏转。对于选定的系统尺寸，流体的性质和吸收器的材料，随着流体的温度上升从0.1摄氏度/米（在接收器的长度上的平均值）增加到0.5摄氏度/米，吸收器温度的最大周向差异从9摄氏度增加到23摄氏度，最大挠度从-5.9毫米增加到-13.7毫米（正号和负号分别表示离开和朝向槽的顶点线的偏斜）。随着光学误差从0毫拉德增加到20毫拉德，吸收体温度的最大周向差异从14摄氏度降低至11摄氏度，最大挠度从-8.8毫米降低至-7.2毫米。当轮缘角从60度增加到140度时，吸收体温度的最大周向差异从16摄氏度减小到7摄氏度，最大挠度从-9.0毫米减小到-1.7毫米。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Solar Energy》 |2015年第4期|289-302|共14页
  • 作者

    Khanna Sourav; Singh Suneet; Kedare Shireesh B.;

  • 作者单位

    Indian Inst Technol, Dept Energy Sci & Engn, Bombay 400076, Maharashtra, India;

    Indian Inst Technol, Dept Energy Sci & Engn, Bombay 400076, Maharashtra, India;

    Indian Inst Technol, Dept Energy Sci & Engn, Bombay 400076, Maharashtra, 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; Absorber tube; Temperature; Bending;

    机译：抛物线槽;吸收管;温度;弯曲;

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