solar vacuum tube

solar vacuum tube
1.resist high temperature five hundred
2.contain no heavy metal.
3.high light transparency.
solar vacuum tube

Specification
Structure
All glass double concentric tubes
Material
Borosilicate glass 3.3
Outer tube diameter
Φ47±0.7.mm &=1.6mm Φ58±0.7.mm &=1.6mm
Length
47mm-1500mm/1600mm/1800
58mm-1.5m/1.6m/1.8mm/2.1m
coating
CU/SS-ALN/ALN
Absorption rate after evacuating
α= 0.93–0.96(AM1.5)
Emission rate after evacuating
ε= 0.04–0.06(80°C±5°C) (AM1.5)
Vacuum degree
P≤5.0×10­¯³Pa
Average heat loss conficient
U
LT
= 0.4-0.6w(m².°c)
Max stagnation temperature
270°C-310°C
Service life
15 yaears
Pressure
0.6MPa
Impact Resistance
Φ≤25mm