Product information

Newfriend Vacuum tube：All-glass evacuated solar collector tubes

High heat-collecting effciency:The vacuum magnetic- controlled sputtered aluminum nitrogenaluminum selective absorption coating has a solar absorptance≥0.93,a heat emittance≤ 6%,a low heat loss,and a good thermal-retention effect.

Good weather-resistance:It has a good all-year thermal efficiency and is able to withstand the front impact by the hail of a diameter below 25mm and a pressure 0.6MPa.
Long service life:ensures a service life of 15 years for the evacuated tube.

◆ Properties of all-glass evacuated solar collector tubes

Item	Measured value	Specification in Chinese state standard
ptance of the solar selective absorbing coatings	α≥0.931	α≥0.86(AM1.5)
Hemisphere emittance	ε≤0.06	ε≤0.09(80±5℃)
Solar radiance exposure using sun as medium	H≤ 2.639MJ/m2	H≤ 3.8MJ/m2
ation parameter using air as medium	Y≥240m2.℃ /Kw	Y≥175m2.℃ /Kw
Average heat loss coefficient	ULT≤ 0.78W/m2.℃	ULT≤ 0.9W/m2.℃

Model	Outer diameter/inner diameter(mm)	Length(mm)	Package
1	58/47	2000	Carton
2	58/47	1800	Carton
3	58/47	1500	Carton
4	47/37	1200	Carton
5	47/37	1500	Carton
6	47/37	1800	Carton
7	47/37	1900	Carton

◆ Three target vacuum pipe

New intervene film technology:utilize copper, aluminum and titanium three target film technology.

High heat efficiency: 12% higher than common vacuum pipe Anti aging and attenuation: common vacuum pipe will be aged and attenuated in high temperature and shining condition (250℃).Three target vacuum pipe can bear 400℃, the life of the pipe is extended greatly.

Excellent heat preservation feature: Three target vacuum pipe utilize super fine copper mirror, hot water is available in not under minus 30 ℃ condition. The inner pipe cleaning and gas discharge has strictt procedure, vacuum layer is pure without impurity. Vacuum degtrr is high and heat loss is 65%. less than common vacuum pipe,frost crack will never happen.