供应太阳能热水器玻璃真空管

Outer Diameter and Inner Diameter (MM): ��47/37; ��58/47 
Length of Tube (MM): 1200, 1500, 1600, 1800, 2000, 2100 
Thickness of Tube (MM): 1.60± 0.15 
Material: Borosilicate glass 3.3 
Thermal Expansion: 3.3*10-6/k 
Maximum Strength: 0.6 Mpa 
Selective absorbing surface: AL-N-AL 
Sediment method: Three target magnertron sputtering plating 
Absorption of Selective Coating: α =90% -93% (AM1.5) 
Emission of Selective Coating: ξ =5%-7.5%(80 º C± 5º C) 
Stagnation Temperature: 220-260m2º C/KW 
Solar Irradiation for Water Temperature Rise: ��4.0MJ/ m2 
Coefficient of Average Heat Loss: 0.6-0.7W/(m2 º C) 
Vacuum: P��3.0*10-3Pa