All Glass Evacuated Tube

1. Ordinary Evacuated tubeSpecification:Structure:All-glass coaxial dual tubeGlass material:High borosilicate glass 3.3 Diameter and length of tube(mm):Φ47x1200,Φ47x1500,Φ47x1600,Φ47x1800Φ58x1500,Φ58x1600,Φ58x1600,Φ58x1600Φ58x1600,Φ58x2000,Φ58x2100Φ70x1800,Φ70x2000,Φ70x2100Solar selective absorbing coating:Al-N/Al solar selective absorbing coating Absorbance:≥91%Emittance:≤8%Vacuum degree:≤0.002PaStagnation parameter:≥250m²oCkwSolar irradiation under stagnation:≤2.8MJ/m²Average heat loss coefficient:≤0.8W/m²oCLifetime:15 years2. Three High Evacuated tubeAdvantages:High temperature: by special stainless steel aluminum nitride layer,it could bear the high temperature of 500oC,and the film is not falling,not aging.Anti-cold: Super-copper launches mirror, Low reflectance, Small heat loss, good collector results in cold environment, and has hot water.Efficient absorption:
All Glass Evacuated Tube