Solar Vacuum Tubes, Vacuum Glass Tube, Solar Water Heating manufacturer / supplier in China, offering Thermal Solar Tube Borosilicate 3.3 Color, 70mm Solar Glass Vacuum Tube, vacuum Glass Tube / Domestic Hot Water Collector Tube, Home Solar System Flat Plate Solar Panel and so on.
|Purchase Qty. / Reference FOB Price|
|1,000-4,049 Pieces||US $3.95|
|4,050+ Pieces||US $3.86|
|Payment Terms:||L/C, T/T|
|Type:||Double Vacuum Heating Tube|
|Application:||Water Heater, Solar Thermal, Air Conditioning System|
The evacuated tube is the key component to all the thermal heaters and system. It's similar to a conventional Dewar flask and consists of two borosilicate glass tubes, resistant to high chemical and thermal shock. The outer side of the inner tube is coated with a sputtered solar selective surface. This coated inner tube is closed at one end and sealed at the other end to the outer tube. The annular space between the outer tube and inner tube is evacuated to avoid heat loss in conduction and convection. The key element determines function of tube is the technology of the film coating, Gaia Solar tube is the best efficiency tube you can find in China, with the highest absorptance rate of near 97% with common rate of 94% and lowest emission rate near 3% with common rate of 5%.
|Method of Deposition||DC reactive sputtering|
|Variation along Tube Length||3%|
|Emittance||< 6% (100°(C)|
|Vacuum Gas Pressure||£ 5 x 10-3 Pa|
|Stagnation Temperature (typical)||³ 270 °(C|
|Recommended Working Temperature||£ 150 °(C|
|Heat Loss Coefficient of Collector Tube||£ 0.85W / (M2·°(C)|