Vacuum tube:

Specification:

1: Ø 47mmx1800mm 2: Ø 58mmx1800mm 3: Ø 58mmx1900mm 4: Ø 58x2100mm

Structure: All-glass double-tube co-axial structure

Glass material: High borosilicate 3.3 glass

Absorptive coating property:

Structure: CU/SS-ALN(H)/SS-ALN(L)/ALN

Sediment method: 3 target magnetron sputtering plating

Specific absorption: As=0.93~0.96(AM1.5)

Emission ration: H=0.04~0.06(80° C± 1.5° C)

Vacuum tightness: P<=5.0*10-³ Pa

Idle sunning property parameters: Y=260~300m² . ° C/kw

Solar irradiation for obtaining a preset water temperature:

H<=4.7MJ/m² (Φ 58) H=3.7~4.2MJ/m²

H<=3.7MJ/m² (Φ 47) H=2.9~3.2MJ/m²

Average heat loss coefficient: ULT=0.4~0.6W/(m² . ° C)