Specifications of Evacuated Glass Tube :
Absorbance Rate after Coating (AM1.5): I a Y94.5%
Absorbance Rate after Evacuating (AM1.5):I a Y92.5%
Emission Rate after Coating (80A 5a ) :Iua 6.5%
Emission Rate after Evacuating (80A 5a ): Iua 7.5%
Stagnation Parameter:a Y220m2a /KW
Solar Radiance Exposure:a 3.3MJ/ m2
Average Heat Loss Coefficient:a 0.75W/(m2 .a )
Selective Coating Material: Al-N/ Al
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.
Coating Lighter Area: The coating color shall be even, with lighter area shall be smaller than 50mm
Vacuum Degree: a 3A 10-3Pa
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