Three target vacuum tube
Evergreen 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.
New intervene film technology:utilize copper,aluminum and titanium three target film technology.
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 .
High heat efficiency:12% higher than common vacuum tube 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.
1. The efficiency of a vacuum tube solar water heater is dependent upon a number of factors, one important one being the level of evacuated radiation (insolation) in your region.
2. Excellent performance of absorbing, but low heat loss, Especially adapted to sever cold regions,(super heat preservation).
Evergreen solar successfully introduced the Advanced Solar Selective Coating, which achieves the greater thermal efficiency and better thermal stability innovatively. The solar selective coating absorbs most solar radiation as well as suppresses the thermal emittance loss from the coating. With the help of DC magnetron sputtering technology, the absorptance of 0.94 - 0.96 and emittance of 0.04 - 0.06 has been achieved. The main absorbing wavelength ranges from 0.35μm to 3.0μm
Efficiency Curve VACUUM TUBE
3. Reducing the fouling on the tube wall, keeping water clean.
4. Excellent resistance of corrosion, long life span ( up to 15 years)
Standard PYREX high borosilicate glass with coefficient of linear expansion 3.3×10-6/℃, complies with international ISO1776 acid proof Grade 1, ISO695 alkali proof above Grade 2. It can resist the hailstone with Diameter 25mm, resisting pressure 1MPa.
5. Excellent resistance of burst.
Improved molecule structure of plated selective coating, attributed to DC magnetron sputtering technology, makes the highest of vacuum tube working temperature as high as 500℃, effectively preventing the coating from bursting, aging, discoloring, function attenuating because of long time burn under the sun, prolonging its life span to 15 years.
Furthermore, the special material plated on tube coating is activated promptly once sun irradiate. The upper surface of semi-cylinder of tube heated by sunshine directly, and the under surface heated by reflected ray at the same time, have different temperatures, so the thermal force propels the water to cycle in the tube rapidly. Consequently, the water circulation in the tube which is made of toughened high borosilicate 3.3 glass balances the temperature and prevents tube from burst.
6. Vacuum tubes are aligned in parallel, the angle of mounting depends upon the latitude of your location. In a North South orientation the tubes can passively track heat from the sun all day. In an East West orientation they can track the sun all year round.
| 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.
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