Baoguang solar vacuum or evacuated tube for water heater

Technical data
1.tube structure:all-glass double deck co-axial structure
2.outer tube diameter and glass thickness:47mm/58mm/70mm,1.6mm
3.inner tube diameter and glass thickness:37mm/47mm/58mm
4.tube length:1200/1500/1600/1800/1900/2000/2100mm
5.coating material: Cu/SS-ALN
6.absorptivity:>0,93
7.emittance:<6.5%
8.vacuum degree: <0.005 Pa
9.average heat loss:<0.65
10.Hail resistance:25mm
11.pressure-endure:0.6 MPa

Characteristics
1)using copper as the bottom metal layer , lower emittance ,high thermal efficiency.
2)Adopting stainless hydronium in the place of aluminum, high temperature resistance.
3) The cover rate of selective absorber coating is high, the effect of decalescence and retaining hot is good.
4) The effect of super-anti-cold is superb, it can run uner -40 centigrade.
Baoguang solar vacuum or evacuated tube for water heater