solar vacuum tubes solar heating system

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 2000mm  2100mm

Absorption coating property

Structure

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

Sediment method

3 target magnetron sputtering plating

Specific absorption

0.93~0.96

Emission ratio

0.04~0.06

Vacuum tightness

5.0*10–³Pa

Idle sunning property parameters

260-300m2°c/kw

Solar irradiation for obtaining a preset water tempereture

H≤4.7MJ/m2

Φ=58

H=3.7-4.2ML/m2

H≤3.7MJ/m2

Φ=47

H=2.9-3.2MJ/m2

Average heat loss coefficient 

0.4-0.7W/m2°c

Resist hailstone

Φ=25mm

Resist cold

minus 30 degree

Resist wind

30m/s