Single target All-glass vacuum heat collection tube property and specification

1- Structure: All-glass double-tube co-axial structure

2- Glass material: High borosilicate 3.3 glass

3- External pipe diameter and thickness:
??=47± 0.7mm &=1.6mm
??=58± 0.7mm &=1.6mm
??=70± 0.7mm &=2.0mm

4- Internal pipe diameter and thickness:
??=37± 0.7mm &=1.6mm
??=47± 0.7mm &=1.6mm
??=58± 0.7mm &=1.6mm

5- Pipe length:
800mm / 1200mm / 1500mm / 1600mm / 1800mm / 1900mm / 2000mm / 2100mm

6- Absorbing coating property:
1)- Structure: AL/AL-ALN(H)/AL-ALN(L)/ALN
2)- Sediment method: Single target magnertron sputtering plating
3)- Spectific absorption: As=0.90~0.93(AM1.5)
4)- Emission ratio: ξ H=0.05~0.075(80º C± 5º C)

7- Vacuum tightness: P??5.0x10-3Pa

8- Idle sunning property parameters: Y=220~260m2. º C/KW

9- Solar irradiation for obtaining a preset water temperature:
1)- H??4.7MJ/m2(??58): H=4.1~4.4MJ/m2
2)- H??3.7MJ/m2(??47): H=3.1~3.4MJ/m2

10- Average heat loss coefficient: ULT=0.6~0.7W/(m2. º C)