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&=1.6mm

Φ=58±0.7mm&=1.6mm

Pipe length 

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

Absorptive coating property

structure

/AL/AL-ALN(H)/AL-ALN(L)/ALN

Sediment method

Single target magnetron sputtering plating 

Specific absorption

0.90---0.93(AM1.5)

Emission ratio

0.05---0.075(80oC±5oC)

Vacuum tightness

P≤5.0×0.001(Pa)

Idle sunning property parameters

Y=220---260m2.C/KW

Solar irradition for obtaining a preset water temperature

H≤4.7MJ/(Φ58)

H=4.1---4.4MJ/m2

H≤3.7MJ/(Φ47)

H=3.1---3.4MJ/m2

Average heat loss coefficient

U=0.6---0.7W/(m2.oC)