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提高几何聚光比是提高聚焦型集热器效率的主要措施之一。若接收器接收辐射的总表面积保持不变的话,则聚光比的提高,就必须扩大入光孔面积。文[1]曾对旋转抛物面几何参数的最佳选取作过详细的分析和推导,但失之于烦琐,同时也不直观。文[2]只是从光学分析出发,提出为了消除入射光在半球面内部的多次反射,提高球面的光学效率,确定半球面张角应≤120°。关于平底圆锥面的分析,未见报道。本文试图从聚光比、采光利用率以及曲面总面积诸因素之间的关系,来确定这些曲面的几何参数的最佳选取,并提出评价上述三种曲面经济效益的指标。
Increasing the geometric concentration ratio is one of the main measures to improve the efficiency of the focus collector. If the receiver receives the total surface area of radiation remains the same, then the increase in the concentration ratio, we must expand the light into the hole area. Text [1] has made a detailed analysis and derivation of the best selection of the geometrical parameters of the paraboloid of rotation, but it is lost in cumbersomeness and not intuitive at the same time. In [2], only from the optical analysis, it is proposed that in order to eliminate multiple reflections of the incident light in the hemispherical surface and improve the optical efficiency of the spherical surface, the hemispherical opening angle should be determined to be ≤120 °. On the flat conical surface analysis, has not been reported. This paper attempts to determine the best selection of geometrical parameters of these surfaces based on the relationship between the light-collecting ratio, lighting utilization rate and the total surface area, and puts forward the index to evaluate the economic benefits of these three surfaces.