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Dome window and mount design for a large scale solar receiver.

机译：大型太阳能接收器的圆顶窗和安装设计。

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摘要

Large windows are being evaluated for use in high temperature concentrated solar receivers to reduce radiative and convective losses, maintain a differential pressure, and separate reactants from ambient air for chemical processing. The design of a 1.7 meter diameter quartz dome window is evaluated for its ability to maintain acceptable stresses when exposed to pressure differentials and large heat loads from solar irradiation and re-radiation from the receiver walls. Just as important as the window geometry is the method to mount the window to the receiver. This thesis is a contribution to the design of a window mount prototype for a solar receiver called the Small Particle Heat Exchange Receiver (SPHER) intended to be built and tested at the National Solar Thermal Test Facility at Sandia National Laboratories as part of a DOE Sunshot Award to San Diego State University.;The work presented in the following chapters builds upon successful pressurized solar receivers by others, including previous work done by colleagues at SDSU, and discussions with industry partners, Aerojet Rocketdyne and L-3 Brashear, to determine specific design constraints. An evaluation of varying window geometries is preformed and a spherical window with a cap angle of 45 degrees is evaluated using different mounting techniques. Since this is much more than an academic exercise, research is done with commercialization in mind - factors like material procurement, cost, reliability and assembly all need to be heavily considered. Trade studies of materials, gaskets, and conceptual designs are presented along with the methodology of the design process.;To first understand the acceptable tensile stresses in the window a Weibull failure probability method is used to arrive at a projected lifetime of the window under a constant state of stress. This approach is used to determine the maximum design tensile stress of 7.25 MPa during operation of the solar receiver under the assumption that is under a constant load. A reduced in duty cycle at the same load will effectively lengthen the lifetime. Remediating the tensile stresses proves to be a challenge and many design concepts are evaluated. Window temperatures from a Monte Carlo Ray Trace (MCRT) method of the National Solar Thermal Test Facility heliostat field and receiver re-radiation are utilized to couple the thermal mechanical effects of the window and its mount.;A design concept is developed using Grafoil as the sealing interface at the window edge and a flexure system to accommodate the thermal expansion differences between the window mount and the receiver body. The mapped temperatures within the window, boundary pressure of 5 MPa, along with other mechanical effects become inputs to COMSOL Multiphysics, a Finite Element Analysis (FEA), model where the maximum stresses in the window and surrounding components are evaluated to ensure the failure criterions are met. The design is promising but varying results of the tensile stress based on contact conditions are observed and the resulting analysis is presented.
机译：人们正在评估将大窗户用于高温集中式太阳能接收器，以减少辐射和对流损失，保持压差，并将反应物与周围空气分开进行化学处理。对直径为1.7米的石英圆顶窗的设计进行了评估，以了解其在承受压差以及由于太阳辐射和接收器壁的再辐射而产生的大量热负荷时保持可接受的应力的能力。与窗口几何图形同样重要的是将窗口安装到接收器的方法。这篇论文是对太阳能接收器窗架原型设计的一个贡献，该窗架原型被称为小颗粒热交换接收器（SPHER），旨在作为美国能源部Sunshot的一部分在桑迪亚国家实验室的国家太阳能热测试设施中进行建造和测试。圣地亚哥州立大学奖；以下各章介绍的工作是建立在其他成功的加压太阳能接收器的基础上的，包括SDSU同事以前所做的工作，以及与行业合作伙伴Aerojet Rocketdyne和L-3 Brashear的讨论，以确定具体的设计约束。可以对不同的窗口几何形状进行评估，并使用不同的安装技术来评估顶角为45度的球形窗口。由于这不只是学术活动，因此研究时要考虑到商业化-物料采购，成本，可靠性和组装等因素都必须予以认真考虑。介绍了材料，垫片和概念设计的商业研究以及设计过程的方法。为了首先了解窗户中的可接受拉应力，我们采用了Weibull失效概率方法来得出窗户在一定温度下的预期寿命。持续的压力状态。在假定恒定负载的情况下，该方法用于确定太阳能接收器运行期间的最大设计拉伸应力7.25 MPa。在相同负载下占空比的减小将有效地延长使用寿命。补救拉伸应力被证明是一个挑战，并且对许多设计概念进行了评估。利用美国国家太阳热测试设施定日镜场的蒙特卡洛雷迹线（MCRT）方法和接收器的再辐射来获得车窗温度，以耦合车窗及其支座的热机械效应。窗户边缘的密封接口和挠曲系统，以适应窗户固定架和接收器主体之间的热膨胀差异。窗口内的映射温度，5 MPa的边界压力以及其他机械效应成为COMSOL Multiphysics有限元分析（FEA）模型的输入，该模型在其中评估窗口和周围组件的最大应力以确保失效准则被满足。该设计是有希望的，但是观察到了基于接触条件的拉伸应力变化结果，并给出了结果分析。

著录项

  • 作者

    Saung, E-Fann.;

  • 作者单位

    San Diego State University.;

  • 授予单位 San Diego State University.;
  • 学科 Engineering Mechanical.;Alternative Energy.
  • 学位 M.S.
  • 年度 2013
  • 页码 163 p.
  • 总页数 163
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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