6 solar tubes for solar water heater(CE,CCC,ISO)

Strucure All-glass double tube co-axial structureGlass materialHigh Borosilicate 3.3 glassOuter tube diameter and thicknessφ=47 ±0.7mm =1.6mmφ=58 ±0.7mm =1.6mmφ=70 ±0.7mm =2.0mmInner tube diameter and thicknessφ=37 ±0.7mm =1.6mmφ=47 ±0.7mm =1.6mmφ=58 ±0.7mm =1.6mmTube length1200,1500,1600,1700,1800,2000,2100mmCoatingCU/SS-ALN(H)/SS-ALN(L)/ALNSediment method3target magnertron sputtering platingAbsorptance94%Emittance Emittance6%(80)Vacuum tightnessP≤5×10-3paStagnation parameter≥260M²/KWSolar radiance exposure for obtaining a preset water temperature≤2.8MJ/M2Average heat loss coefficient≤0.6W/(M3lifetime15yearsSolar water heater tube