Study on the Optical Properties of Triangular Cavity Absorber for Parabolic Trough Solar Concentrator

Table 3

The orthogonal experimental results of optical efficiency on cavity absorber.

Number				Optical; efficiency/%
1	1	1	1	89.01
2	1	2	2	89.15
3	1	3	3	89.22
4	2	1	2	88.97
5	2	2	3	88.99
6	2	3	1	89.33
7	3	1	3	88.68
8	3	2	1	89.03
9	3	3	2	89.12
Average 1	89.127	88.887	89.123
Average 2	89.097	89.057	89.080
Average 3	88.943	89.223	88.963
Range	0.184	0.336	0.160
Primary and secondary factors
Optimization