all glass vacuum tube 1.excellent quality & cheap price 2.higher absorbility & lower emission 3.longer working time Product Description
Specification of All-glass evacuated solar collector tubes: 1. Structure: All glass concentric dual 2. Glass material: Tube geometer 3. Absorptance: Borosilicate glass 4. Emitlance: >0.92 5. Vacuum: <0.08(80 Celsius degree) 6. Stagnation: <5*10-3Pa 7. Lifetime: >15 years Feature: vacuum tubes assimilate the advanced 12 layers of spattering deposition of trivalent element technology, high borosilicate glass, and gradual change of ALN/AL N-SS/CU selective complex absorptive coating. And these make vacuum tubes have high performance of absorptance and low reflection ratio. Through the interlayer, vacuum has a unique effect of thermo, with its temperature up to 380 Celsius degree of ideal sunning, performing a strong heating ability.
| Models | Material | Dia(mm | Length | Coating | Vacuum | Transmittance | Bearing hail |
| 47*1500 | borosilicate | 47 | 1500 | ALN/AiN-SS/CU | <=5*10-3 | 0.91 | 25mm |
| 47*1800 | borosilicate | 47 | 1800 | ALN/AiN-SS/CU | <=5*10-3 | 0.91 | 25mm |
| 58*1800 | borosilicate | 58 | 1800 | ALN/AiN-SS/CU | <=5*10-3 | 0.92 | 25mm |
| 58*2100 | borosilicate | 58 | 2100 | ALN/AiN-SS/CU | <=5*10-3 | 0.91 | 25mm |
Structure
| All glass double tube co-axial structure
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Glass material
| High borosilicate 3.3 glass
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Outer tube diameter and thickness
| Φ=47±0.7mm&=1.6mm Φ=58±0.7mm&=1.6mm Φ=70±0.7mm&=2.0mm | ||
Inner tube diameter and thickness
| Φ=37±0.7mm&=1.6mm Φ=47±0.7mm&=1.6mm Φ=58±0.7mm&=1.6mm | ||
Tubes length
| 800mm 1200mm 1500mm 1600mm 1800mm 1900mm 2000mm 2100mm | ||
Absorptive coating property | Material of coating
| CU/SS-ALN(H)/SS-ALN(L)/ALN | |
Sediment methods | 3 target magnetron sputtering plating | ||
Absorptance
| As=0.92~0.96(AM1.5) | ||
Emission ratio | ∑h=0.04~0.06(80°c±5°c) | ||
Vacuum
| P≤5.0*10-3(Pa) | ||
Idle sunning property parameters | Y=260~300m2.C/KW | ||
Solar irradiation for obtaining a preset water temperature | H≤4.7MJ/m2(Φ58) | H=3.7~4.2MJ/m2 | |
H≤3.7MJ/m2(Φ47) | H=2.9~3.2MJ/m2 | ||
Average heat loss coefficient | -U(LT)=0.4~0.6W/(m2.°c) | ||
Tri-Element Vacuum Tube greenhouse heating systems
