solar vacuum tube

Description

solar vacuum tube can absorb sun spectrum, with high efficiency. It can withstand *5mm hail. life time of tube can be *0 years 产品详细描述 Technical parameters Material High boron-silicon(specially hard)glass Lengthmm ******0±5mmspecial specification per contract ***** *8(mm) ±0.6mm *8(mm)±0.6mm ***** *7(mm) ±0.6mm *7(mm)±0.6mm Film structure Gradual change AL-N/AL selective absorbing coated Sun absorptance Iayers≥0.*2(AM=1.5) (International standard≥0.*6) Hemisphere emmissivity ≤0.**6(*0) (International standard≤0.*9) Empty solarization parameters ≥**6m2/KW(International standard≥**5) Cover tightly solarization amount ≤3.6MJ/m2(International standard≤3.8) Average heat loss coefficient ≤0.*6W/ m2 (International standard≤0.*0) Interlayer vacuum ≤3X***2Pa (International standard≤3X***2Pa) Hail Resistance *5mm