solar water heater vacuum tube (58mm---1800mm)

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

500mm 850mm 1200mm 1500mm 1600mm  1700mm 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(80°C±5°C)

Vacuum tightness

5.0×10-3 Pa

Idle sunning property parameters

220~260 m².°C /KW

Solar irradiation for obtaining a preset water temperature

H≤4.7MJ m²(Φ58)

H=4.1~4.4 MJ/ m²

H≤3.7MJ/ m²(Φ47)

H=3.1~3.4 MJ/ m²

Average heat loss coefficient

0.6~0.7W/(m².°C)

Resist Hailstone

Φ25mm

Resist cold

   -30°C

Resist wind

   30 m/s

Life aged

    15 years