On the basis of the structural principle of secondary reflector in a new type solar collector in beam-down central receiver system

the Soltrace software was employed to perform numerical simulation on the secondary reflector with ellipsoid and hyperboloid.The results show that:the appropriate range of the optimal structural parameters of the ellipsoid secondary reflector 2a/f was between 0.63 and 0.72;that of the optimal structural parameters of the hyperboloid secondary reflector 2a/f was between 0.6and 0.75

which was larger.With the same focal length and optical effect

the tower height the hyperboloid secondary reflector required was obviously lower than that of the ellipsoid secondary reflector.Therefore

the hyperboloid secondary reflector should be chosen first.