Ensource | En source | Solar energy | glass evacuated vacuum tube | solar collector

(1) All glass evacuated Vacuum tube made of high borosilicate glass,use the Graded AI-N/AI selective surface sputtering –solar selective absorbing coating technology.

(2) Coating material : aluminium –nitrogen-alumininium.etc.

(3) These make vacuum tubes have high performance of absorption and low reflection ratio.

(4) Through the interlayer, vacuum has a unique effect of thermo, with its temperature up to 380 degrees of idle sunning, performing a strong heating ability.

Technical Specifications

Types	All-glass evacuated vacuum tube
Configuration	Two-concentric borosilicate glass tubes
Glass-thermal expansion coefficient	3.3×10-6/℃
Solar-selective-absorbing-coating-Technology	Graded Al-N/Al selective surface, sputtering
Absorbance Rate after coating(AM1.5)	≥94.5%
Absorbance Rate after Evacuating(AM1.5)	≥92.5%
Emission Rate after coating(80±5℃)	∑≤6.5%
Emission Rate after Evacuating(80±5℃)	∑≤7.5%
Average Heat Loss Coefficient	≤0.75W/(㎡℃)
Selective Coating Material	Aluminium nitrogen-aluminium
Impact Resistance	Steel Ball Test:Steel ball with diameter of 30mm fall on the evacuated tube vertically from 450mm height,the evacuated tube is not damaged.
Vocuum Degree	≤3×10-3Pa
Pressure	0.6MPa
Transparent	≥0.89(AM1.5/SO9806-1:1994)

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