General vacuum tubes

General solar collector tube is 1)higher absorptance ,lower emittance 2)reliable quality,reasonalbe price 3)warranty 15 year

    General solar collector:

Its mental layer at bottom is typically made of aluminum. Absorption layer and antireflective layer are compound of Nitrogen and aluminium ion.Membranous layer is about 0.3 micron.

    In order to reduce energy loss through heat emission, the most efficient absorbers have a selective surface coating, which is rinsed by the water moved ion so that the selective coating can be adhere to the tubes firmly . It guarantees the efficiency and service life of the collector tube.

    perfect process technology : The patented technologies in circular sealing and annealing system make a solid linkage between the inner and outer tube and fully eliminate the internal stress,solving the problem of liable damage in sealing parts.

    It can be applied not only in the water heater under various weather conditions ,but also in the hi-tech areas such ai refrigeration and generating electricity.

Our solar collector tube stands out not only because of its quite low emission rates, but also because its production is emission-free and energy-efficient.

  

solar collector tube Parameter:

Configuration	General solar collector tube
Material	Borosillicate glass
Glass thermal expansion coefficient	3.3×10-6
Diameter of cover tube	47mm/58mm
Diameter of inner tube	37mm/47mm
Thickness of glass	1.6mm
Transmittance of cover tube	0.91
Length	1200 / 1500 /1800mm
Solar selective absorbing coating	Graded Al-N/Al selective surface, sputtering
Solar absorptance(AM1.5)	0.9
Emittance(80)	0.08
Stagnation Temperature	≥200
Heat loss coefficient	≤0.80W
Impact resistance	Withstand hailstone of 25 mm in diameter
Strength(pressure tested)	1MPa

General vacuum tubes