glass vacuum tube

GLASS VACUUM TUBE

Specification
Outer Diameter and Inner Diameter (MM) 47 / 37 58 / 47
Length of Tube (MM) 1500, 1600, 1800, 2100
Thickness of Tube (MM) 1. 60 more or less 0. 15
Selective absorbing surface: 3layers, aluminum-nitrogen-carbon (Al-N-C)
Material: Borosilicate glass 3. 3
Color: Blue
Thermal Expansion: 3. 3 multiply 10-6 / k
Maximum Strength: 0. 6 Mpa
Absorption of Selective Coating: above 95 percent
Emission of Selective Coating: below 5 percent
Stagnation Temperature: above200m2 degree / KW
Solar Irradiation for Water Temperature Rise below 3. 0mj / m2
Coefficient of Average Heat Loss below 0. 70w / (m2 degree)
Vacuum above 3. 0 multipy 10-2Pa (anti heat loose)