high absorbtion ,15 years liftime.5 years warrenty period.
Three-high all-glass vacuum heat collection tube property and specification: Structure: All-glass double-tube co-axial structure; Glass material: High borosilicate 3.3 glass; External pipe diameter and thickness: Φ =47± 0.7mm &=1.6mm; Φ =58± 0.7mm &=1.6mm; Φ =70± 0.7mm &=2.0mmInternal pipe diameter and thickness: Φ =37± 0.7mm &=1.6mm; Φ =47± 0.7mm &=1.6mm; Φ =58± 0.7mm &=2.0mmPipe length: 800mm; 1200mm; 1500mm; 1600mm; 1800mm; 1900mm; 2000mm; 2100mmAbsorptive coating property: Structure: Cu/SS-ALN(H)/SS-ALN(L)/ALN
Deposition Method: 3 high magnetron sputtering platingAbsorption than: As=0.93~0.96(AM1.5)Emission ratio: 0.04~0.06(80± 5)Vacuum tightness: P≤ 50x10-3 (Pa)Idle sunning property parameters: Y=260~300m2. /KWSolar irradiation for obtaining a preset water temperature: H≤ 4.7MJ/m2 (Φ 58) H=3.7~4.2 MJ/m2 H≤ 3.7MJ/m2 (Φ 47) H=2.9~3.2 MJ/m2 Average heat loss coefficient: ULT=0.4~0.6W/(m2. )
solar vacuum tube
