Engery-saving-A all-glass Solar vacuum tube

Energy-sacing Solar vacuum tube:
good material;high thermal efficiency;small heat lose;long life;strength;crossion;anti-code.
Solar vacuum tube:
Basic features:
1. selection: 3.3 high borosilicate glass as raw material, its performance in line with ISO3585: 1991 requirements.
2. thermal efficiency: use of space technology, 8-layer vacuum coating, vacuum layer of pure unadulterated, high vacuum and durable, the sun has a very high absorption rate and low thermal emittance.
3. heat loss is small: between the layers in the vacuum tube to maintain a high vacuum, to minimize heat conduction, convection heat loss.
4. Long life: the coating layer performance and stability, not aging, fading, material selection, production, transportation, quality and other aspects of procedure strictly, longer life.
5. Corrosion: The new anti-corrosion technology, effectively inhibit microbial growth, excellent resistance to chemical attack, for a variety of water quality.


material
borosilicate glass 3.3
length
1600mm
inner tube diameter
47mm
outer tube diameter
58mm
membrane
gradient AL-N-C/AL selective absorbing coating
solar absorptance
> 0.09 (AM = 1.5)(international requirements as:>0.86)
hemisphere emission ratio
> 0.086 (80 °C) (international provisions: ≤ 0.09)
air drying performance parameters
≥186square meters.°C/kw(international requirements as:≥175)
The amount of sun radiation exposure stuffy
≤ 2.86MJ / m
2
(international provisions: ≤ 3.8)
Average heat loss coefficient
≤ 0.75W / m (International provisions: ≤ 0.90)
inside and outside the tube laminated tube
≤ 5 × 10-3pa (international provisions: ≤ 5 × 10-2pa)
heat shock
Below 25°C 90°C repeated alternating hot and cold water more than three times without damaging the impact of
pressure
withstand the pressure of 0.6Mpa
anti-hail
size of not more than 25mm can withstand without damage hail attack