Fig. 1. Surface-shape structure of novel CPC

Fig. 2. Geometric surface-shape of traditional CPC

Fig. 3. Ordinate value of novel CPC surface-shape starting point versus β

Fig. 4. θ1 of novel CPC surface shape versus β

Fig. 5. CPC model printed by 3D printer

Fig. 6. Platform for verifying concentrating performance of CPC

Fig. 7. Experimental and simulated results of concentrating performance for CPC surface-shape

Fig. 8. Comparison of concentration performances of novel and traditional CPCs . (a) Aperture width angle is 30°; (b) aperture width angle is 40°; (c) aperture width angle is 50°; (d) aperture width angle is 60°

Fig. 9. Influence of contingence angle on geometric concentration ratio

Fig. 10. Relation between permissible receiving angle and contingence angle

Fig. 11. Simulation results of critical light for novel CPC under different contingence angles. (a) 10.00°; (b) 20.00°; (c) 30.00°

Fig. 12. Energy flow distributions on absorber surfaces of novel and traditional CPCs under different incident angles. (a) Traditional CPC, incident angle of 30°, and left semicircular absorber; (b) traditional CPC, incident angle of 30°, and right semicircular absorber; (c) traditional CPC, incident angle of 30°, and left semicircular absorber; (d) traditional CPC, incident angle of 35°, and right semicircular absorber; (e) novel CPC, incident angle of 30°, and left semicircular absorber; (f) novel CPC,

Table 1. Geometric parameters of solar vacuum tube

Table 2. Geometric parameters of concentrator surface-shape model

Table 3. Main parameters of 3D printer