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VACUUM TUBE

SOLAR WATER HEATER SYSTEM

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[THREE-LAYER CONCENTRIC GLASS TUBES]

FEATURE:

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

• Super and strong absorption

• Siphonage makes heat commutation faster

• The hollow layer to reduce water stagnation

• 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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