Solar Evacuated Tubes

The evacuated tube is a product with improved geometry and performance and consists of two concentric glass tubes which are sealed in a semi-circular shape on one side and are joined to one another on the other side. The space between the tube is evacuated and then hermetically sealed (evacuated insulation). To use solar energy, the internal glass coated with an environmentally friendly, highly selective la er on the outside, thus turning it into an absorber. The coating is protected in the evacuated space. The aluminum nitride sputter coating used is characterized by an ex u extremely low emission and a high absorption rate

Skylight Evacuated Tube Specifications: 1. Length (nominal):1800mm/1600mm 2. Outer tube diameter: 58mm/47mm 3. Inner tube diameter: 47mm/37mm 4. Glass thickness:1.8mm/2.0mm 5. Thermal expansion: 3.3x10-6í¦C 6. Material: Borosilicate Glass 3.3 7. Absorptive Coating: Graded Al-N/Al 8. Absorptance: v>93% (AM1.5) 9. Emittance:

Supplier: Solar evacuated tubes, solar vacuum tubes, solar collector, , solar water heater, solar manifold

Supplier: Solar water heater, the evacuated tube

1.All Glass Vacuated Tube 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. We use the tubes which use the successfully developed 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 absorbance of 0.94 - 0.96 with an emittance of 0.04 - 0.06 at 100 centigrade has been achieved. Models º¦47í-150 º¦58í-180 Weight 1.35í+0.12kg 2.29í+0.18kg Structure All glass coaxial double-layer tubes All glass coaxial double-layer tubes Outer tube diameter º¦47í+0.7mm º¦58í+0.7mm Inner tube diameter º¦37í+0.7mm º¦47í+0.7mm Outer Tube thickness 1.6í+0.15mm 1.8í+0.15mm Inner tube thickness 1.6í+0.15mm 1.6í+0.15mm Tubes length 1542í+4mm 1812í+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 Pí_5í-10-3pa Pí_5í-10-3pa Transmittance of Outer Tube 0.91 0.91 Stagnation temperature (height) 270~300íµ 270~300íµ Heat-loss coefficient í_0.6w/ m2*íµ) í_0.6 w/ (m2*íµ). Bearing hailstone ability hailstone diameterº¦25mm hailstone diameterº¦25mm. Pressure-endure ability 1MPa 1MPa.

Supplier: Solar water heater, solar collector, evacuated tube, photovoltaic system
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The tubes are made from low emissivity borosilicate glass (glass with a very low iron content that has superior durability and heat resistance ) with an all-glass seal and they employ AL/N on AL selective coating, which enables the use of the whole solar energy spectrum to generate heat; this produces greater thermal efficiency in bright sunshine but also produces high efficiency in overcast or diffuse sunlight conditions. Further, the tubes are evacuated and have a barium getter (vacuum indicator) which changes color from silver to white if a tubes vacuum has been compromised. An examination of the tubes shows that the outside is actually 2 layers of glass and a vacuum has been created between them. A good way to demonstrate this would be to fill an empty tube with very hot water and notice that it does not even get warm as you hold the tube in your hands. That is because of the thermos effect¡± created by having a vacuum between the layers of glass. Carton with foam inside.

Supplier: Solar water heater, solar collector, solar panels, evacuated glass tubes, sanitary ware

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