Investigation of Optic-thermal Characteristics of Supercritical Carbon Dioxide Solar Cavity Heat Receiver
For the solar energy disk concentrator,a type of supercritical carbon dioxide(sCO2)trun-cated cone cavity heat receiver was designed and developed,and the optic-thermal model of the heat re-ceiver was established.The Monte Carlo ray tracing method was used to analyze the optical characteristics of the cavity heat receiver.Based on the related theory of the cavity heat receiver,the thermal boundary conditions were introduced into the Ansys Fluent software,and the flow and heat transfer characteristics of the cavity heat receiver were simulated by computational fluid dynamics(CFD).When the inlet tem-perature of the working fluid was 150℃and the solar radiation intensity was 800 W/m2,the effects of different diameters of the aperture,tilt angles and radiation emissivity on its optic-thermal characteristics were studied.The results show that the diameter of the aperture has a great influence on the thermal effi-ciency of the receiver.The increase of the diameter of the aperture will reduce the optical efficiency of the receiver.If the diameter of the aperture is too large or too small,the thermal efficiency of the receiver will be reduced;with the increase of the tilt angle of the receiver,the natural convection heat transfer be-tween the hot air in the aperture and the external cold air increases obviously;the radiation emissivity has little effect on the thermal efficiency of the receiver.
solar energcavity heat receiversupercritical carbon dioxide(sCO2)numerical simulation
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