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Heliostat fields with a balanced mirror density
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DOI：10.1016/j.solener.2022.07.050.png)
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摘要
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The efficiency of heliostat fields is analyzed in terms of mirror density. It is shown that it is possible to estimate the blocking and shadowing losses without ray tracing or polygon clipping. The calculations are based on general geometric properties and provide a kind of upper limit for heliostats with various mirror shapes and tracking systems. The use of mirror density allows to skip a multiparametric optimization of heliostat coordinates and to describe heliostat fields as if they had an ideal layout. The optimal distribution of mirror density is found by solving a variational problem, which assures that the transfer of heliostats from a region of low efficiency to a region of high efficiency does not change the overall efficiency of the field. The gains from the transfer are compensated exactly by the losses from the additional blocking and shadowing. It is shown how to design heliostat fields with a balanced mirror density, and the advantages of the balanced layout are compared with a more conventional nonblocking layout. The analysis also includes an economic model, which helps to estimate the price of solar heat and to distribute the investment costs properly between the heliostat field and other components of power plant.
Keyword:
Heliostat field
Mirror density
Blocking losses
Shadowing losses
Balanced layout
期刊
IF:
6.6
论文数:
1.4W
被引数:
6.2W
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引用论文
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