Solar Vacuum Tube

ALUMINUM (AL) BASED SOLAR HEATER VACUUM TUBES
1.solar vacuum tube
2.TUBE STRUCTURE: All Double-layer Glass Tube Structure (co-axial )
3.GLASS MATERIAL: High BoroSilicate 3.3 Glass
4.COATING MATERIAL: AL/AL-ALN(H)/AL-ALN(L)/ALN
5.SPECIFIC ABSORPTION: as=0.90-0.93 (AM 1.5)
6.EMISSION RATIO: 0.050-0.075 (80 C)7.AVERAGE HEAT LOSS: 0.6-0.
7 W/m2.C8.HAIL RESISTANCE: 25mm (diameter for hailstone resistance)
9.PRESSURE RESISTANCE: 1Mpa
10.VACUUM TIGHTNESS (Vacuum degree): 50x0.001 Pa max.
11.STAGNATION TEMPERATURE (highest resistant temperature): 220C-260C
COPPER (CU) BASED SOLAR HEATER VACUUM TUBES
1.TUBE STRUCTURE: All Double-layer Glass Tube Structure (co-axial )
2.GLASS MATERIAL: High BoroSilicate 3.3 Glass
3.COATING MATERIAL: CU/SS-ALN(H)/SS-ALN(L)/ALN
4.SPECIFIC ABSORPTION: as=0.92 - 0.96 (AM 1.5)
5.EMISSION RATIO: 0.04-0.06 (80 C)
6.AVERAGE HEAT LOSS: 0.4-0.6 W/m2.C
7.HAIL RESISTANCE: 25mm (diameter for hailstone resistance)
8.PRESSURE RESISTANCE: 1Mpa
9.VACUUM TIGHTNESS (Vacuum degree): 50x0.001 Pa max.
10.STAGNATION TEMPERATURE (highest resistant temperature): 260-300C