heat pipe tube

high quality
5 years warranty
Structure

Dual concentric geometry tube
Material of glass
hard borosilicate:3.3
Diameter and thickness of outer tube
Ø58±0.5mm&1.6mm
Diameter and thickness of inner tube
Ø47±0.5mm&1.6mm
Length of vacuum tube
1800mm(±mm)
Properties of absorptive coating
Coating method
selective absorptive sputtering coating:
SS-C/cu & AL/N
Transmissivity t≥0.89(AM1.5)
0.913
Absorptance α≥0.86(AM1.5)
0.930
Emissivity εh≤0.080(30degree±5degree)
0.026
Pressure of vacuum tube p≤5×10-2 Pa
5×10-3Pa
Stagnation parameter Y>250sqm·degree/kW
246.3
Solar radiance H<4.7MJ/sqm
4.59
Average heat loss coefficient: ULT<0.8W(sqm·degree)
0.721
Lifetime
15 years