Predicted optical performance

A raytrace program was used to compare the performance of the CPC, SURS A and SURS B performance. Fig. 4 shows the transverse optical performance of the three systems with a double glass absorber tube. The SURS B has the highest normal incidence output for a reflectance of 0.95 but that the greatest efficiency over all incidence angles is still the CPC. However, the differences are slight. The identical performance for incidence angles beyond 60 degrees is due to the fact that in all three systems the tubes are fully shading the reflector.

Fig. 4. Predicted optical performance for three 14 tube systems, including double glass
tubes as receivers and a reflector of 0.95.