Solar purple evacuated tube

详情

Solar purple evacuated tube Standard: high quality Diameter of the outer tube and length of the tube: Φ*7/***0, Φ*7/***0, Φ*8/***0, Φ*8/***0, Φ*8/***0(mm) Material of the glass: borosilicate 3.3 glass Film-coating technology: patented interference technology Material of coating: AL/AL-ALN(H)/AL-ALN(L)/ALN Absorptance:0.*4~0.*6 Emittance:0.*4~0.*6 Vacuum rate: 5**0¯3pa Bearing hailstone ability: hailstone diameter *5mm Pressure-endure ability: 1MPa Description: All glass evacuated tubes are the key component of solar collectors. The evacuated tube is similar to a conventional Dewar flask and consists of two borosilicate glass tubes, a glass with high chemical and thermal shock resistance. The outer side of the inner tube is coated with a sputtered solar selective surface. This coated inner tube is closed at one end and sealed at the other end to the outer tube. The annular space between the outer tube and inner tube is evacuated to virtually eliminate heat loss by conduction and convection. The characteristics: 1. High solar-thermal conversion and low heat loss 2. Stable advanced coating up to **0 degree centigrade 3. Long time warranty to *5 years 4. High level vacuum ensure operation under cold weather