solar vacuum tubes

solar vacuum tubes:

High absorption efficiency,widelyapplicant to family solar system and commercial solar water system

Inner glass tube diameter: 37mm/47mm/58mm

Glass tube length:available from 1200mm to 2100mm

Wall thickness:1.6mm

High vacuum ,long-term stability:5*103 Pa

Absorptive Coating:Al/N/Al or CU/SS-ALN

Absorption coefficient: more than 93%

Emission coefficient : less than 6

Wind resistance:30m/s

Freezing tolerance:minus 35Celsiur

Hail resistance:25mm

Life time:more than 15years

Single target All-glass vacuum heat collection tube property and specification

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

Absorbing coating property:

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

Sediment method: Single target magnertron sputtering plating

Spectific absorption: as=0.90~0.93(AM1.5)

εh=0.05~0.075(80±5)

Vacuum tightness: P≤5.0X10^-3Pa

Idle sunning property parameters: Y=220~260m²./KW

Solar irradiation for obtaining a preset water temperature:

H≤4.7MJ/m²(Φ58) H=4.1~4.4MJ/m²

H≤3.7MJ/m²(Φ47) H=3.1~3.4MJ/m²

Average heat loss coefficient: ULT=0.6~0.7W/(m².)

Three-target all-glass vacuum heat collection tube property and specification

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 &=2.0mm

Pipe length: 800mm 1200mm 1500mm 1600mm 1800mm 1900mm 2000mm 2100mm

Absorbing coating property:

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

Sediment method: 3 target magnertron sputtering plation

Specific absorption: as=0.93~0.96(AM1.5) εh=0.04~0.06(80±5)

Vacuum tightness: P≤5.0X10^-3Pa

Idle sunning property parameters: Y=260~300m²./KW

Solar irradiation for obtaining a preset water temperature:

H≤4.7MJ/m²(Φ58) H=3.7~4.2MJ/m²

H≤3.7MJ/m²(Φ47) H=2.9~3.2MJ/m²

Average heat loss coefficient: ULT=0.4~0.6W/(m².)