triple-cavity all-glass vacuum heat collection tube

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

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

Emission ratio

0.05~0.075

Vacuum tightness

5.0×103 Pa

Idle sunning property parameters

220~260./KW

Solar irradiation for obtaining a preset water temperature

H≤4.7MJ/(Φ58)

H=4.1~4.4MJ/

H≤3.7MJ/(Φ47)

H=3.1~3.4MJ/

Average heat loss coefficient

0.6~0.7W/(.)

Resistant Hail

25mm

Life aged

15 years