solar vacuum tube

Specifications

solar vacuum tube is inosculated by two glass tube at one end.inner tube with a selective coating,it can absorb the solar energy

Vacuum tube is inosculated  by  two  glass tube at one end.inner tube with a selective coating, it can absorb the solar energy, prevent heat loss.Underpressure the air to form vacuum between the two tubes , prevent the conduction and convection heat loss.These tubes have high efficiency in the cloudy weather and low temperature conditions.This is because the tube material is glass, therefore the possibility of leakage be reduced to a minimum. Glass vacuum tube have a wide range of uses, including the DC or mixed with the heat pipe. Although the efficiency of the vacuum tube is lower than cryotron, but cheaper.

 technical parameter:

Model type	TG47	TG58
Length	1500mm	1800
Outer tube diameter	47mm	58mm
Inner tube diameter	37mm	47mm
Glass thickness	1.5mm	1.5mm
Thermal expansion	3.3x10-6	3.3x10-6
Material	3.3	3.3
Absorptive Coating	AL/N/AL	AL/N/AL
Absorption coefficient	>90%	>90%
Emission coefficient	<10%	<10%
Vacuum	P<5x10-2Pa	P<5x10-2Pa
Stagnation Temperature	>200oC	>200oC
Net weight	1.20kg	2.23kg