Solar vacuum tube

solar vacuum tube
1) high quality and reasonable price
2) environmental friendly
3) nice design
Made of outstanding material,processed by advanced technique,making them high quality.
parameters:

Material high 3.3 borosilicate glass
Models Φ47/58/70
Structure Graded Cr-Al-N/Al/Cu coating double-layer tubes(most advanced coating in current world)
Outer tube diameter 47±0.7mm /58±0.7mm
Inner tube diameter 37±0.7mm/47±0.7mm
Tube thickness 1.6±0.15mm/1.8±0.15mm
Absorptance 0.94~0.96
Emittance 0.04~0.06
Transmittance of outer tube 0.92
Stagnation temperature(height) 219~300
Presure-endure 1.0Mpa
Stable advanced coating up to 420.
React swiftly and collects solar energy effectively.
The tube can bear the impact of the steel ball(diameter 30mm) fall in height 450mm.
High level vacuum ensure operation under Bad weather(-50
o
C_500
o
C)
Ideal heat collection efficiency in extreme cold water, with hot water available at a temperature of -30
o
C.
Long time warranty to 15 years.