The new ICPC evacuated tubes were fabricated with two absorber orientations, one with a vertical absorber fin and one with a horizontal fin. A cross-section of the collector tube illustrating the two orientations is shown in Fig. 3.

The collector array is made up of three banks. The north bank consists of all horizontal fin tubes, the middle bank consists of all vertical fin evacuated tubes and the south bank includes an even mixture of the two types. The two differently oriented fined collectors gave essentially identical

Fig. 4: 60 Degree Nominal Angle Ray Tracing
for the Vertical fin ICPC.

performance. The flow pattern through the 112 evacuated tubes in each bank is parallel and the three banks are plumbed in parallel.