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Solar evacuated tube EN-T*2 THREE TARGET COPPER VACUUM TUBE 3.solar heating tube 4.heat pipe MODEL size QTY Diameter Length Thickness Quantity (tubes) ESA****0 Φ*7 X ***0 *0 φ*7mm ***5mm 1.5mm(±0.1mm) ***7TUE ****0HQ ESA****0 Φ*8 X ***0 *5 φ*7mm ***5mm 1.7mm(±0.1mm) ***0TEU ***0HQ EST****0 Φ*8 X ***0 *5 φ*7mm ***5mm 1.7mm(±0.1mm) ***0TEU ***0HQ ESH****0 Φ*7 X ***0 *0 φ*7mm ***5mm 1.5mm(±0.1mm) ***7TEU ****0HQ ESH****0 Φ*8 X ***0 *5 φ*7mm ***5mm 1.7mm(±0.1mm) ***0TEU ***0HQ Detailed Product Description 1. New intervene film technology : utilize copper aluminum and titanium three target film technology. 2. Coating material add aluminum nitrogen aluminum, copper , stainless steel. coating time use longer than three target tube , and stronger coating film. 3. Excellent heat preservation feature: Three target copper vacuum pipe utilize super fine copper mirror, hot water is available from 0 to **0 degree condition. Technical specification types Three target copper vacuum pipe Glass-thermal expansion coefficient 3.3****6/℃ Solar-selective-absorbing-coating-technology Utilize copper aluminum and titanium three target film technology Absorbance rate after coating(AM1.5) >*4.5% Absorbance rate after evacuating(AM1.5) >*3.5% Emission rate after coating(*0±5 centigrade ) ∑≦6.0% Emission rate after evacuating (*0±5 centigrade ) ∑≦6.5% Solar radiance exposure ≦3.0MJ/㎡ Average heat loss coefficient ≦0.*0W/(㎡/℃) Selective coating material Aluminium nitrogen-aluminum, copper, stainless steel. etc Impact resistance Steel ball test: steel ball with diameter of *0mm fall on the evacuated tube vertically from **0mm height, the evacuated tube is not damaged Coating lighter are The coating color shall be even with lighter are shall be smaller than *0mm Vacuum degree ≦3***-³pa Pressure 0.6mPa 0.6mPa transparent ≧0.*9(AM1.5/SO******1:***4)