|
Configuration
|
General solar collector tube
|
|
Material
|
Borosillicate glass
|
|
Glass thermal expansion coefficient
|
3.3×10-6
|
|
Diameter of cover tube
|
47mm/58mm
|
|
Diameter of inner tube
|
37mm/47mm
|
|
Thickness of glass
|
1.6mm
|
|
Transmittance of cover tube
|
0.91
|
|
Length
|
1200 / 1500 /1800mm
|
|
Solar selective absorbing coating
|
Graded Al-N/Al selective surface, sputtering
|
|
Solar absorptance(AM1.5)
|
0.9
|
|
Emittance(80)
|
0.08
|
|
Stagnation Temperature
|
≥200
|
|
Heat loss coefficient
|
≤0.80W
|
|
Impact resistance
|
Withstand hailstone of 25 mm in diameter
|
|
Strength(pressure tested)
|
1MPa
|
