Structure

All-glass double-tube co-axial structure

Glass material

High borosilicate 3.3 glass

External pipe diameter and thickness

Φ=47±0.7mm&=1.6mm Φ=58±0.7mm&=1.6mm Φ=70±0.7mm&=2.0mm

Internal pipe diameter and thickness

Φ=37±0.7mm&=1.6mm Φ=47±0.7mm&=1.6mmΦ=58±0.7mm&=1.6mm

Pipe length 

800mm 1200mm 1500mm 1600mm 1800mm 1900mm 2000mm 2100mm

Absorptive coating property

structure

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

Sediment method

3 target magnetron sputtering plating 

Specific absorption

A=0.92~0.96(AM1.5)

Emission ratio

0.04--0.06 (80oC±5oC)

Vacuum tightness

P≤5.0×10-3 Pa)

Idle sunning property parameters

Y=260---300m2.C/KW

Solar irradition for obtaining a preset water temperature

H≤4.7MJ/m2(Φ58)

H=3.74.2MJ/m2

H≤3.7MJ/m2(Φ47)

H=2.93.2MJ/m2

Average heat loss coefficient

U=0.40.6W/(m2.oC)