GTC T SERIES GLASS TUBE
Feature:
* Higher Absorbance,Lower emittance,dry exposure up to 270°C
* Higher efficiency,more heating
Absorbance coating layout:
1–metal reflecting layer(copper)
2–absorbance layer(SS aluminumnitride metal ceramic)
3–remittance reducer layer(aluminumnitride)
GTC’s vacuum tube adopt dry absorb type selective coating with lower remittance,
it solved the problem of normal tube having not good curve of remittance,when the
temperature higher,the remittance higher,which reduce the efficiency of the tube.
3 higher point of this new tube
Higher Efficency:The absorbance increased by 14% with remittance reduce by 30-40%
Higher Heat conduction:dry exposure temperature up to 270°C and can endure -30°C environment temperature and still working
Higher Vacuum Degree:Unique technology to keep the vacuum degree,stable absorbance which guarantee the long life of the tube
| zhejiang green technologe solar vucuum tube spec. | |||
| model name | M series high efficiency tubes | T series high efficiency tubes | |
| Structure | All-glass concentric dual tube geometer | ||
| Glass material | Borosilicate glass | ||
| Outer tube diameter and thickness | Ø47±0.7mm &=1.5mm | ||
| Ø58±0.7mm &= 2.0 mm | |||
| Inner tube diameter and thickness | Ø37±0.7mm &=1.5mm | ||
| Ø47±0.7mm &=1.6mm | |||
| Tube Length | 1500(±5mm) | ||
| 1800( ±5mm) | |||
| Absorbing coating properties | Construction | Graded Al-N/Al solar selective absorbing coating | graded SS-C/CU solar selective absorbing coating |
| Method to deposition | DC reactive sputtering | 3 sputtering | |
| Absorbance | >91% | >94% | |
| Emittance | <8%(80°C) | <6% | |
| Vacuum | P<5X10 -3 Pa | ||
| Stagnation parameter | = 230M 2 °C/KW | 260m2 C/kw | |
| Solar radiance exposure for obtaining a preset water temperature | = 2.8MJ/M 2 | ||
| Average heat loss coefficient | 0.8w/m2 C | 0.6W/(m2 C | |