Configuration
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General solar collector tube
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Material
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Borosillicate glass
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Glass thermal expansion coefficient
|
3.3×10-6
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Diameter of cover tube
|
47mm/58mm
|
Diameter of inner tube
|
37mm/47mm
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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
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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
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Strength(pressure tested)
|
1MPa
|