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Natural convection heat loss estimation of solar cavity receiver by incorporating a modified aperture ratio

机译：结合改进的孔径比估算太阳腔接收器的自然对流热损失

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摘要

On the basis of the consideration of air property variation with temperature, a three-dimensional (3-D) numerical investigation has been performed to attain insight into the cavity aspect ratio on the natural convection heat loss of a cavity receiver for a high-temperature solar dish system. Temperature and velocity contours as well as the variation curves have shown that the expansion of convection zone together with the augmentation of velocity magnitude is mainly responsible for the increase in natural convection heat loss with decreasing cavity aspect ratio, that is, shallower cavity. Moreover, the dependency of natural convection heat loss on the cavity aspect ratio is related to the tilt angle. Also, a modified definition of aperture ratio has been introduced, aiming to reflect the combined impact of the cavity aspect ratio and aperture size. Finally, two correlations of Nusselt number have been proposed by incorporating the cavity aspect ratio and the newly defined modified aperture ratio, respectively.
机译：在考虑空气特性随温度变化的基础上，进行了三维（3-D）数值研究，以了解腔体长宽比对高温腔体接收器自然对流热损失的影响太阳能碟系统。温度和速度等值线以及变化曲线表明，对流区的扩展以及速度幅度的增加是造成自然对流热损失随腔长宽比减小（即腔浅）而增加的主要原因。而且，自然对流热损失对腔长宽比的依赖性与倾斜角有关。同样，引入了孔径比的修改定义，旨在反映腔体纵横比和孔径的综合影响。最后，通过分别合并腔长宽比和新定义的修改孔径比，已经提出了两个Nusselt数相关性。

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  • 来源
    《Renewable Power Generation, IET》 |2012年第2期|p.122-128|共7页
  • 作者

    Xiao L.; Wu S.-Y.; Li Y.-R.;

  • 作者单位

    Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, People's Republic of China;

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