solar vacuum tube
Excellent resistance,corrosion
keeping water clean
Excellent performance of absorbing
high efficiency
Excellent resistance,corrosion
keeping water clean
Excellent performance of absorbing
high efficiency
| Modle: | JVN | JVT | |
| Structure | All-glass double-layer coaxial | ||
| Tupe 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 | ||
| Inner 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 property | Structure | AL/N/AL | ALN/AIN-SS/CU |
| Sediment Method | Selective absorptive coating | Three target magnetron sputtering plating | |
| Absorptance | as=0.88-0.93(AM1.5) | as=0.93-0.96(AM1.5) | |
| Emittance ratio | Σ h=.0.04-0.08(80C±5C) | Σ h=.0.04-0.06(80C±5C) | |
| Vacuum tightness | p ≤ 5.0 × 10 Pa | p ≤ 5.0 × 10 Pa | |
| Stagnation parameter | Y=250m2. C/kw | Y=260-300m2. C/kw | |
| solar irradiation under stagnation | H=4.7MJ/m2 | H=3.7-4.2MJ/m2 | |
| Average heat loss coefficient | ULT=0.6-0.84W(m2.C) | ULT=0.4-0.6W(m2.C) | |
| Lifetime | 15years | ||
| Hail resistance | Φ25mm | ||