内置螺旋管直径对接收器光热转换特性的影响

Impact of Built-in Coiled Tube Diameter on the Optical-thermal Conversion Characteristics of Receiver

构建了蒙特卡洛光线追踪(MCRT)和CFD耦合模型,分析了内置螺旋盘管直径对圆柱形接收器光热转换特性的影响。结果表明:不同管径下盘管外壁面太阳辐射热流密度均呈现双峰分布;随着管径的增加,盘管外壁面吸收太阳辐射能量和光学效率均减小;管径从8 mm增加到18 mm时(DNI=650 W·m^(-2)),光学效率、腔体热效率、光热转换效率分别降低了0.38%、0.3%、1.62%;减小管径有利于提高接收器整体性能。

A coupling model based on Monte Carlo ray trace(MCRT)and CFD was developed to investigate the influence of the built-in coiled tube diameter on the optical-thermal conversion characteristics of cylindrical receiver.The result s show that the solar radiat ion heat flux on the outer wall of the coiled tubes presents a bimodal distribution under different tube diameters.The solar radiation absorbed by the outer wall of coiled tubes and optical efficiency decrease with the increase of tube diameter.When the tube diameter is increased from 8 mm to 18 mm(DNI=650 W·m^(-2)).the optical efficiency,thermal officieney and optical-thermal conversion efficicncy of the receiver are reduced by 0.38%,0.3%.1.62%,respectively.Reducing the tube diameter is conducive to improving the integral performance of receiver.