| Customization: | Available |
|---|---|
| Certification: | ISO |
| Concentrating: | Yes |
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The evacuated tube is the key component to all the thermal heaters and systems. It's similar to a
conventional Dewar flask and consists of two borosilicate glass tubes, resistant to high chemical and
thermal shock. 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 avoid heat loss in conduction and convection.
The key element determines function of tube is the technology of the film coating, with the highest absorptance rate of near 97% with common rate of 94% and lowest
emission rate near 3% with common rate of 5%. At this efficiency, it has been very hard to improve the function any more, even very little part.
Solar vacuum tube cooker specification
| Model | 125mm*1800mm | 125mm*2100mm | ||||||||
| Structure | All-glass concentric tube geometry | |||||||||
| Glass Material | Borosilicate glass | |||||||||
| Length | 1800mm | 2100mm | ||||||||
| Outer Tube Diameter | 125mm | |||||||||
| Inner Tube Diameter | 110mm | |||||||||
| Wall Thickness | 3.0mm | |||||||||
| Transmittance of Outer Tube | 0.93 | |||||||||
| Construction | ALN/ALN-SS/Cu/ Glass | |||||||||
| Absorptive | Method of Deposition | DC reactive sputtering | ||||||||
| Coating | Absorptance | 94% | ||||||||
| Properties | ||||||||||
| Variation along Tube Length | 3% | |||||||||
| Emittance | < 6% (100°ƒ[1](C) | |||||||||
| Vacuum Gas Pressure | £ 5 x 10-3 Pa | |||||||||
| Stagnation Temperature (typical) | ³ 270 °ƒ[1](C | |||||||||
| Recommended Working Temperature | £ƒ 150 °ƒ[1](C | |||||||||
| Heat Loss Coefficient of Collector Tube | £ 0.85W / (M2·ƒ[1]°ƒ[1](C) | |||||||||
| Impact Resistance | Withstand 1 inch diameter hailstone without breaking | |||||||||
| Strength (pressure tested) | 1 MPa | |||||||||
| Lifetime | 15 years | |||||||||
1. Higher efficiency collector, much lower heat loss with vacuum insulation;
2. High pressure and super anti-freezing performance in cold weather condition;
3. Less heat loss for closed loop circulation;
4. No system drainage even though one or several tubes are broken;
5. No risk of tube breaking from thermal shock;
6. More convenient in system parts carring and installation.
Solar vacuum tube cooker production photos
Contact us
Dezhou Gaia Solar Energy Co.,Ltd
Room 712, Baitiane Plaza, No.7 of HuBinnan Road, Dezhou City, Shandong Province
Website: gaiasolar.en.made-in-China.com
Mobile and Chat: 0086-13953485199
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