| S. no. | Process Parameters | Level 1 | Level 2 | Level 3 |
| 1 | Reflectivity (A) | Silver Mirror Film (SMF) (0.95) | Glass Mirror (GM) (0.97) | - |
| 2 | Absorptivity (B) | U-Tube Aluminium Coated with Si (0.83) | U-Tube Aluminium Coated with Black Ni (0.93) | U-Tube Aluminium Coated with Cr (0.97) |
| 3 | Period of Sun Incidence (C) | 9.00 AM - 11.00 Am | 11.00 AM - 01.00 PM | 01.00 PM - 04.00 PM |