normal solar collector tube

Normal solar tube is
1)higher absorptance ,lower emmitance
2)eco-friendly
3)ISO9001:2000

Normal solar collector tube :its mental layer at bottom is typically made of aluminum. Absorption layer and antireflective layer are compound of Nitrogen and aluminium ion.Membranous layer is about 0.3 micron.




General solar vacuum tube has the reasonable price and high quality .


Structure
All-Glass Double Tube Co-Axial Structure
Glass Material
High Borosilicate 3.3 Glass
External Pipe Diameter & Thickness
dia.=47±0.5mm &=1.6mm, dia.=58±0.5mm &=1.6mm,
dia.=70±0.5mm &=2.0mm,
Internal Pipe
Diameter & Thickness
dia.=37±0.5mm &=1.6mm, dia.=47±0.5mm &=1.6mm,
dia.=58±0.5mm &=1.6mm,
Pipe Length
1500mm, 1600mm, 1700mm, 1800mm, 1900mm, 2000mm
Absorptive Coating Property
Structure
Cu/SS-ALN(H)/SS-ALN(L)/ALN
Sediment Method
Three Layer Magnetron Sputtering Plating
Specific Absorption
as=0.92~0.96(AM1.5)
Emission Ratio
0.01~0.03(80°C±5°C)
Vacuum
P≤2.0×10-3Pa
Idle Sunning Property
Y= 260 ~ 300m²°C/KW
Solar Irradiation for Obtaining a Preset Water Temperature
H≤4.7 MJ/ m²(dia.58)
H=3.7~4.2 MJ/ m²
H≤3.7 MJ/ m²(dia.47)
H=2.9~3.2 MJ/ m²
Average Heat Loss Coefficient
Ult=0.4~0.6W/( m².°C)
Pressure-Endure Ability
0.6Mpa
Hail-Endure Ability
30mm
Lifetime
15years