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Vacuum tube material:
| tube | standard tube(normal tube) | Tri-tube(Three high tube) | ||
| Specification | 4715 | 5818 | 4715 | 5818 |
| Length | 1500mm | 1800mm | 1500mm | 1800mm |
| Outer tube diameter | 47mm | 58mm | 47mm | 58mm |
| inner tube diameter | 37mm | 47mm | 37mm | 47mm |
| weight | 1.3kg | 2.2kg | 1.3kg | 2.2kg |
| Glass thickness(inner tube) | 1.6mm | 1.6mm | 1.6mm | 1.6mm |
| Glass thickness(outertube) | 1.8mm | 1.8mm | 1.8mm | 1.8mm |
| Glass material | Borosilicate Glass3.3 | Borosilicate Glass3.3 | Borosilicate Glass3.3 | Borosilicate Glass3.3 |
| Coating material | AI-N-AI | AI-N-AI | AIN-SS-Cu | AIN-SS-Cu |
| Coatin position | Outer surface of inner tube | Outer surface of inner tube | Outer surface of inner tube | Outer surface of inner tube |
| Deposition Method | DC reactive sputtering | DC reactive sputtering | DC reactive sputtering | DC reactive sputtering |
| Absorption ratio | ≥ 91% | ≥ 91% | ≥ 94% | ≥ 94% |
| Reflection ratio | ≤ 7% | ≤ 7% | ≤ 6% | ≤ 6% |
| Vacuum degree | 3.0T2-3pa | 3.0T2-3pa | 8.0T2-3pa | 8.0T2-3pa |
| Thermal expansion | 3.3*10-6/ | 3.3*10-6/ | 3.3*10-6/ | 3.3*10-6/ |
| Stagnation parameter | 220m2/kw | 220m2/kw | 220m2/kw | 220m2/kw |
| Sloar rediance exposure for obtaining a preset water temperature |
4.6MJ/M2 | 4.4MJ/M2 | 3.9MJ/M2 | 3.6MJ/M2 |
| Average heat loss coefficient |
0.75w/(m2. ) | 0.73w/(m2. ) | 0.67w/(m2. ) | 0.62w/(m2. ) |
| Max pressure | 0.6Mpa | 0.6Mpa | 0.6Mpa | 0.6Mpa |
| Minimum temperature endurable |
-35 | -35 | -40 | -40 |
| Hailstore endurable (diameter) |
Less than D25mm | Less than D25mm | Less than D25mm | Less than D25mm |
| Maximum temperature endurable |
270 | 270 | 300 | 300 |
| Lifetime | 15 years | 15 years | 15 years | 15 years |
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