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Vacuum tubes assimilate the advanced 12 layers of apattering deposition of trivalent element technology, high borosilicate glass, gradual change of SS-C/CU selective complex absorptive coating. Through the interlayer, vacuum has an unique effect of thermo, with its temperature up to 400 degree of idle sunning, performing a strong heating abilitty.
Certificate: CE, CCC, ISO9001, SOLARKEYMARK, SRCC
Specification:
Length | 1500mm | 1800mm |
Outer tube diameter | 47mm | 58mm |
Inner tube diameter | 37mm | 47mm |
Glass thickness | 1.6mm | 2.0mm |
Material | High borosilicate Glass 3.3 | High borosilicate Glass 3.3 |
Absorptive coating | gradual change of SS-C/CU selectivecomplex absorptive coating | gradual change of SS-C/CU selectivecomplex absorptive coating |
Vacuum degree | P<5*10 -3 Pa | P<5*10 -3 Pa |
Heat-absorbing rate | >93%-96% | >93%-96% |
Emission of heat | <6%-4% | <6%-4% |
Solar radiance exposure | ≤2.8MJ/M2 | ≤2.8MJ/M2 |
Calories absorption | 9.1MJ/M2 | 9.1MJ/M2 |
Average heat loss | ≤8.6W/(M3.K) | ≤8.6W/(M3.K) |
Stagnation Temperature | >220 celsius degree | >220 celsius degree |
Pressure-endure ability | 1.0Mpa | 1.0Mpa |
Resist hailstone | Ø 25mm | Ø 25mm |
Resist wind | 30m/s | 30m/s |
Life | 15 years | 15 years |
Terms:
1.Payment terms: 30% in advance and 70% against B/L copy or 70% by L/C,
For sample T/T 100% in advance
2. Delivery terms: 15 working days after receiving deposit or original L/C.
3. Warranty: 7 years
4. Minimum quantity: 100 pieces
High Quality Vacuum Tube/Evacuated Tube