| Case | Thickness (mm) | Total heat transfer coefficient (W/m2・K) | Wax thickness (mm) | ||||||
| Steel | FBE | PP Adhesive | PP Solid | PU Foam | PP Solid | CWC | |||
| 1 | 20.1 | - | - | - | - | - | - | 669.12 | 1.80 |
| 2 | 20.1 | 0.15 | 0.35 | 3.5 | 25.21 | 4.00 | 48.22 | 1.91 | 0.151 |
| 3 | 20.1 | 0.15 | 0.35 | 3.5 | - | 4.00 | 48.22 | 20.58 | 1.19 |
| 4 | 20.1 | 0.15 | 0.35 | 3.5 | 25.21 | 4.00 | - | 1.96 | 0.153 |
| 5 | 20.1 | 0.15 | 0.35 | 3.5 | - | 4.00 | - | 31.30 | 1.37 |