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[THREE-LAYER CONCENTRIC GLASS TUBES]

Feature

(1) Compare to double-layer concentric borosilicate glass tubes ,the three layer tubes add one more hollow layer ;

(2) Super and strong absorption

(3) Siphonage makes heat commutation faster

(4) The hollow layer to reduce water stagnation

(5)The vacuum layer to have super and strong preservation

Technical Specifications

Types	Three-layer concentric glass tues
Configuration	Three-layer concentric boron-sillicate glass tues
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)	≥93.5%
Emission Rate after coating(80±5℃)	∑≤6.0%
Emission Rate after Evacuating(80±5℃)	∑≤6.5%
Average Heat Loss Coefficient	≤0.70W/(㎡℃)
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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