Item

One-target

Three-target

Absorption of Selective Coating

AM1.5

≥94.5%

≥95.5%

Emission of Selective Coating

80±5

≤6.5%

≤5.5%

Stagnation Temperature

220m²/KW

≥260m²/KW

Solar Irradiation for Water Temperature Rise

≤2.9MJ/ m²

≤2.8MJ/ m²

Coefficient of Average Heat Loss

≤0.65W/(m² .)

≤0.60W/(m² .)

Structure of Selective Coating

Al-N/Al

Cr-Al-N/Cu

Vacuum

≤3.0*10^-3Pa

Maximum Strength

0.6 MPa

Ratio of Solar Transmission

≥0.89 ( AM 1.5 ISO9806-1: 1994)

In term

Specification

Diameter of Outer/Inner Tube

Φ47/37

Φ58/47

Φ70/58

Length of Tube

1200, 1500

1600, 1800

1920

1500, 1600, 1800

1920, 2000,

1500,

1800

Thickness of Tube

1.60±0.15