Content :

1.   Three-target solar vacuum tube
- Key component of solar collector and solar water heater
- Coating material: Al-N/Al or SS-Al/N/Cu.


We have our own production factory for vacuum tubes with production capacity of 5 million pieces of tubes annually. All our testing and inspection standard is higher than Chinese national standards.






Specification






Absorbance rate after coating (AM1.5)




 %




89






Emission rate after coating (805 C)




 %




7






Stagnation parameter




m C/kW




251






Solar radiance exposure




 MJ/m




3.8






Average heat loss coefficient




W/(mC)




0.56






Selective coating material




 AL-N/AL, SS-AL-N/Cu






Impact resistance




Steel Ball Test: Steel ball with diameter
of 30 mm fall on the evacuated tube vertically from 450 mm height.






Vacuum degree




 Pa




3X10-3






Pressure




Mpa




0.6






Transparent (AM1.5)




0.86 (ISO9806-1: 1994)




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