both end open tube

1.Standard 3.3 high-boron-silicon glass-pipe
2.Low coefficient of heat loss
3.high efficient of keep tempreture
Model
the common tube
Structure
All-glass double-tube co-axial structure
Glass material
High borosilicate 3.3 glass
External pip diameter and thickness
Φ=47±1.0mm§=1.6mm±0.2mm
Φ=58±1.0mm§=1.8mm±0.2mm
Internal pip diameter and thickness
Φ=37±0.8mm§=1.4mm±0.2mm
Φ=47±1.0mm§=1.6mm±0.2mm
Pipe length
950mm 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
A
s
=0.88~0.93 (AM1.5)
Emission ratio
ε
h
=0.04~0.06 (80±5)
Vacuum tightness
P≤5.0×10
-3
Pa
Idle sunning property parameters
Y=260~300 m
2
.C/KW
Solar irradiation for obtaining a preset water temperature
H≤4.7MJ/m
2
(Φ58)
H=3.7~4.2 MJ/m
2
H≤3.7MJ/m
2
(Φ47)
H=2.9~3.2 MJ/m
2
Average heat loss coefficient
U
LT
=0.4~0.6W/(m
2
.)