High Absorption Pressurized Solar Water Heater 3.3 Borosilicate Glass With N/Al Coating Tube

Solar collector tube 3.3 Borosilicate glass with N/Al coating Thickness of glass tube 1.6mm Vacuum tube tightness P≤0.005 Pa Absorption as=0.93-0.96 (AM1.5) Emission ratio εh=0.04-0.06 (80