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Operating conditions of an open and direct solar thermal Brayton cycle with optimised cavity receiver and recuperator

机译:带有优化型腔接收器和换热器的开放式和直接式太阳热布雷顿循环的运行条件

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摘要

The small-scale open and direct solar thermal Brayton cycle with recuperator has several advantages, including low cost, low operation and maintenance costs and it is highly recommended. The main disadvantages of this cycle are the pressure losses in the recuperator and receiver, turbomachine efficiencies and recuperator effectiveness, which limit the net power output of such a system. The irre-versibilities of the solar thermal Brayton cycle are mainly due to heat transfer across a finite temperature difference and fluid friction. In this paper, thermodynamic optimisation is applied to concentrate on these disadvantages in order to optimise the receiver and recuperator and to maximise the net power output of the system at various steady-state conditions, limited to various constraints. The effects of wind, receiver inclination, rim angle, atmospheric temperature and pressure, recuperator height, solar irradiance and concentration ratio on the optimum geometries and performance were investigated. The dynamic trajectory optimisation method was applied. Operating points of a standard micro-turbine operating at its highest compressor efficiency and a parabolic dish concentrator diameter of 16 m were considered. The optimum geometries, minimum irreversibility rates and maximum receiver surface temperatures of the optimised systems are shown. For an environment with specific conditions and constraints, there exists an optimum receiver and recuperator geometry so that the system produces maximum net power output.
机译:带换热器的小型开放式和直接式太阳能热布雷顿循环具有多个优点,包括低成本,低运行和维护成本,因此强烈建议使用。该循环的主要缺点是换热器和接收器中的压力损失,涡轮机效率和换热器效率,这限制了这种系统的净功率输出。太阳热布雷顿循环的不可逆性主要是由于有限温差下的热传递和流体摩擦。在本文中,热力学优化被应用来集中于这些缺点,以优化接收器和换热器,并在各种稳态条件下(受各种限制)最大化系统的净功率输出。研究了风,接收器倾斜度,轮辋角,大气温度和压力,换热器高度,太阳辐照度和浓度比对最佳几何形状和性能的影响。应用了动态轨迹优化方法。考虑了以其最高的压缩机效率运行的标准微型涡轮机的运行点,以及抛物面碟形浓缩器直径为16 m。显示了优化系统的最佳几何形状,最小不可逆率和最大接收器表面温度。对于具有特定条件和约束的环境,存在最佳的接收器和换热器几何形状,以使系统产生最大的净功率输出。

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  • 来源
    《Energy》 |2011年第10期|p.6027-6036|共10页
  • 作者单位

    Department of Mechanical and Aeronautical Engineering, University of Pretoria, Private BagX20, Hatfield, Pretoria 0028, South Africa;

    Department of Mechanical and Aeronautical Engineering, University of Pretoria, Private BagX20, Hatfield, Pretoria 0028, South Africa;

    Department of Mechanical and Aeronautical Engineering, University of Pretoria, Private BagX20, Hatfield, Pretoria 0028, South Africa;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    solar; brayton; optimisation; geometry; receiver; recuperator;

    机译:太阳布雷顿优化;几何;接收器;换热器;

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