Solar vacuum tube

Solar vacuum tube,ALN/ALN-SS/CU or AL-N-AL coating, DIA.47/58mm.Length:0.8/1.5/1.8/2.0m, Thickness:1.6/1.8/2.0mm;20 years life
solar vacuum tube for solar water heater or collector.


CE,ISO9001;CCC

Specification:
1.Outer Diameter /Inner Diameter : Φ47/37mm; Φ58/47mm ;
2.Length of Tube : 800mm; 1500mm, 1800mm, 2000mm, 2100mm
3.Material: Borosilicate glass 3.3 , Thickness of tube:1.6± 0.1mm,;1.8± 1mm;mm;2.0± 1mm;
4.Selective absorbing coating :tri-elements coating (ALN/ALN-SS/CU) or AL-N-AL coating.
5.Thermal Expansion: 3.3*10-6/k
6.Absorption of Selective Coating: α =90% -93% (AM1.5)
7.Emission of Selective Coating: ξ =5%-7.5%(80 º C± 5º C)
8.Coefficient of Average Heat Loss: 0.6-0.7W/(m2 º