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.