Iterm

National Standard

GB/T 17049-2005

GT Solar Evacuated Tubes

Material

Borosilicate Glass3.3

Borosilicate Glass3.3

Absorptance

≥0.86(AM1.5)

≥0.93(AM1.5)

Emission

≤0.08(80±5)

≤0.07(80±5)

Vacuum

P5 x 10-2Pa

P5 x 10-3Pa

Stagnation Temperature

≥190 m2*/kw

≥200m2*/kw

Solar Irradiation for Water Temperature rise

H≤4.7MJ/m2(Φ58)

H≤4.6MJ/m2(Φ58)

H≤3.7MJ/m2(Φ47)

H≤3.6MJ/m2(Φ47)

Coefficient of Average Heat Loss

≤0.85W/(m2*)

≤0.80W/(m2*)

Maximum Strength

0.6Mpa

0.8Mpa