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首页> 外文学位 >EFFECT OF HIGH RECEIVER THERMAL LOSS PER UNIT AREA ON THE PERFORMANCE OF SOLAR CENTRAL RECEIVER SYSTEMS HAVING OPTIMUM HELIOSTAT FIELDS AND OPTIMUM RECEIVER APERTURE AREAS.
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EFFECT OF HIGH RECEIVER THERMAL LOSS PER UNIT AREA ON THE PERFORMANCE OF SOLAR CENTRAL RECEIVER SYSTEMS HAVING OPTIMUM HELIOSTAT FIELDS AND OPTIMUM RECEIVER APERTURE AREAS.

机译：单位面积高接收热损失对具有最佳定日镜场和最佳接收孔径区域的太阳能中央接收系统的性能的影响。

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摘要

Recent efforts in solar central receiver research have been directed toward high temperature applications. Associated with high temperature processes are greater receiver thermal losses due to reradiation and convection. This dissertation examines the performance of central receiver systems having optimum heliostate fields and receiver aperture areas as a function of receiver thermal loss per unit area of receiver aperture. The results address the problem of application optimization (loss varies) as opposed to the problem of optimization of a design for a specific application (loss fixed).; A reasonable range of values for the primary independent variable L (the average reradiative and convective loss per unit area of receiver aperture) and a reasonable set of design assumptions were first established. The optimum receiver aperture area, number and spacings of heliostats, and field boundary were then determined for two tower focal heights and for each value of L. From this, the solar subsystem performance for each optimized system was calculated.; Heliostat field analysis and optimization required a detailed computational analysis. A significant modification to the standard method of solving the optimization equations, effectively a decoupling of the solution process into collector and receiver subsystem parts, greatly aided the analysis.; Results are presented for tower focal heights of 150 and 180 m. Values of L ranging from 0.04 to 0.50 MW m('-2) were considered, roughly corresponding to working fluid temperatures (at receiver exit) in the range of 650 to 1650 C. As L increases over this range, the receiver thermal efficiency and the receiver interception factor decrease. The optimal power level drops by almost half, and the cost per unit of energy produced increases by about 25% for the base case set of design assumptions. The resulting decrease in solar subsystem efficiency (relative to the defined annual input energy) from 0.57 to 0.35 is about 40% and is a significant effect. Unoptimized systems would experience an even greater degradation in performance.; Further study of this problem would indicate the effects which other tower focal heights, receiver orientation, heliostat size, beam degrading, and better focusing heliostats have on the results.
机译：在太阳能中央接收器研究中的最新努力已针对高温应用。与高温过程相关的是由于辐射和对流造成的更大的接收器热损失。本文研究了具有最佳日光场和接收器孔径面积的中央接收器系统的性能，它是接收器每单位面积接收器热损耗的函数。结果解决了应用程序优化的问题（损失有所不同），而不是针对特定应用程序的设计优化的问题（损失固定）。首先建立了主要自变量L的合理值范围（每单位接收器孔径的平均辐射和对流损耗）和合理的设计假设集。然后确定两个塔的焦高和每个L值的最佳接收器孔径面积，定日镜的数量和间距以及场边界。由此，可以计算出每个优化系统的太阳子系统性能。定日镜场分析和优化需要详细的计算分析。极大地修改了求解优化方程的标准方法，有效地将求解过程解耦到收集器和接收器子系统部分，极大地帮助了分析。给出了塔架焦高为150和180 m的结果。考虑到的L值为0.04至0.50 MW m（'-2），大致对应于工作流体温度（在接收器出口处）在650至1650 C范围内。当L超过此范围时，接收器的热效率和接收器的拦截因子减小。在设计假设的基本情况下，最佳功率水平下降了将近一半，每单位产生的能量成本增加了约25％。由此导致的太阳能子系统效率（相对于定义的年度输入能量）从0.57下降到0.35，约为40％，这是一个重大影响。未优化的系统性能将进一步下降。对该问题的进一步研究将表明其他塔架焦高，接收器方向，定日镜尺寸，光束衰减以及更好的定日镜聚焦对结果的影响。

著录项

  • 作者

    PITMAN, CHARLES L.;

  • 作者单位

    University of Houston.;

  • 授予单位 University of Houston.;
  • 学科 Physics Optics.
  • 学位 Ph.D.
  • 年度 1983
  • 页码 244 p.
  • 总页数 244
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

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