Abstract
To develop solar energy technology, the cavity receiver research is worth paying attention to. Instead of considering the cavity as a whole object, the surface of the cavity, exposed to solar radiation, is divided into five sections: the external front cover, the throat, the inner front cover, the pipe surface, and the bottom. Three critical parameters were investigated: the loops number nloop, the distance from focus point to aperture center lf-a, and the aperture diameter dap. Coupling Monte-Carlo Ray Tracing method, an optical simulation model was proposed, heat flux distributions and cavity absorption efficiencies were solved. The results showed that the optimum absorption efficiency achieved 87.44% at 6 loops and 184 mm aperture diameter. If the lf-a was less than −130 mm, the external front cover and bottom would risk the melting, while the heat flux of hot spots was higher than 1.3 × 106 W/m2. The throat was damaged by large lf-a (130 mm) and small dap (184 mm), since the heat flux was higher than 2.1 × 106 W/m2. Summarily, this method can help to detect extremely high heat flux, to prevent hot melt phenomena, then to avoid safety risk of cavity receiver.
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