Three-target vacuum tube

Vacuum Tube
vacuum tube

Model: JVT

Just like an automobile engine, the computer CPU, vacuum tube is the solar water heater. Its performance lies on the coating technology, The three-target evacuated tube rise the heat more than 12%
1) High temperature: by special interference-layer it could bear the high temperature reach to 300℃, and the coating will not shed and aging.
2) Super anti-cold: Super-copper launches mirror, low reflectance, little heat loss ,good absorber results in cold environment, also can generate hot water.
3) Efficient absorption: High absorption is 92%, reflection reduces 65% heat increases 12% Higher temperature, more hot water.

1. Excellent performance of absorbing, but low heat loss, Especially adapted to sever cold regions,(super heat preservation).

JINYI 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

2. 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 300℃, 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.

3. 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.

4. Reducing the fouling on the tube wall, keeping water clean.

5. 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.

6. The efficiency of a vacuum tube solar hot water heater is dependent upon a number of factors, one important one being the level of evacuated radiation (insolation) in your region.


Evacuated Tube Basic Specifications:

All-glass double-layer coaxial
Tube material
High quality borosilicate glass 3.3
Outer tube diameter and thickness
Φ=47±0.7mm & =1.6mm
Φ=58±0.7mm & =1.6mm
Φ=70±0.7mm & =2.0mm
Internal tube diameter and thickness
Φ=37±0.7mm & =1.6mm
Φ=47±0.7mm & =1.6mm
Φ=58±0.7mm & =1.6mm
Tube length
500mm 800mm 1500mm 1800mm
1900mm 2000mm 2100mm

Absorptive coating

Sediment method
Magnetron sputtering plating
Emittance ratio
Vacuum tightness
p ≤ 5.0 × 10-3 Pa
Stagnation parameter
Y=270-300M2. /kw
Solar irradiation under stagnation
Φ47 H≤3.7MJ/m2, Φ58≤4.7MJ/m2
Average heat loss coefficient
ULT=0.72W(M2. )
Hail resistance