Solar collector vacuum tube

Specification

Structure

All glass double concentric tubes 

Material

Borosilicate glass 3.3

Outer tube diameter

Φ47±0.7.mm  &=1.6mm

Inner tube diameter

Φ58±0.7.mm  &=1.6mm

Length

47mm-1500mm/1600mm/1800, 

58mm-1500mm/1600mm/1800mm/2000mm/2100mm

Coating

SS-C/Cu

Absorption rate after evacuating(AM1.5)

α= 0.88–0.90

Emission rate after evacuating(AM1.5)

ε= 0.04–0.06(80°C±5°C)

Vacuum degree

P≤5.0×10­¯³Pa

Average heat loss conficient

U_LT = 0.4-0.6w(m².°c)

Max stagnation temperature

(temperature inside of empty vacuum tube)

260°C-300°C

Pressure

0.6MPa

Impact Resistance

Φ≤25mm