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