All glass evacuated tubes are the key component of solar collectors. The evacuated tube is similar to a conventional Dewar flask and consists of two borosilicate glass tubes, a glass with high chemical and thermal shock resistance. The outer side of the inner tube is coated with a sputtered solar selective surface. This coated inner tube is closed at one end and sealed at the other end to the outer tube. The annular space between the outer tube and inner tube is evacuated to virtually eliminate heat loss by conduction and convection.
Deosun successfully developed the innovative Advanced Solar Selective Coatings in commercial scale, which achieve the highest thermal efficiency and good thermal stability. Solar selective coatings absorb most solar radiation while simultaneously suppressing the thermal emittance loss from coating surfaces. They vary mainly in their optical property and thermal stability.
Excellent results have been obtained by using DC magnetron sputtering technology. A solar absorptance of 0.94 - 0.96 with an emittance of 0.04 - 0.06 at 100 oC has been achieved.


Features:
1.High solar-thermal conversion and low heat loss
2.Stable advanced coating up to 380
3.Long time warranty to 15 years
4.High level vacuum ensure operation under cold weather
Advanced solar selective coatings
Advanced solar selective coatings employ two patent technologies :
(1) double cermet film structure with the highest photothermal efficiency
(2) metal-Aluminum nitride cermet (M-AlN) materials deposited by a novel sputtering technology.
The typical film structure of M-AlN cermet selective surfaces

Models
47×150
58×180

Weight
1.35±0.12kg
2.29±0.18kg

Structure
All glass coaxial double-layer tubes
All glass coaxial double-layer tubes

Outer tube diameter
47±0.7mm
58±0.7mm

Inner tube diameter
37±0.7mm
47±0.7mm

Outer Tube thickness
1.6±0.15mm
1.8±0.15mm

Inner tube thickness
1.6±0.15mm
1.6±0.15mm

Tubes length
1542±4mm
1812±4mm

Material of coating
AlN/AIN-SS/Cu
AlN/AIN-SS/CU

Absorptance
0.94~0.96
0.94~0.96

Emittance
0.04~0.06
0.04~0.06

Vacuum
P≤5×10-3pa
P≤5×10-3pa

Transmittance of Outer Tube
0.91
0.91

Stagnation temperature (height)
270~300
270~300

Heat-loss coefficient
≤0.6w/ m2* )
≤0.6 w/ (m2* )

Bearing hailstone ability
hailstone diameter25mm
hailstone diameter25mm

Pressure-endure ability
1MPa
1MPa

Added: 23.12.2007 Offer viewed: 136 (hits)

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