solar vacuum tube
excellent sclective absorptive coating and perfect combination with high vacuum heat preservation.

solar vacuum tube

The vacuum tube of our solar collector has high absortion rate and low emission rate
1. Abosortion rate: 0.90-0.93(AM1.5)
2. Emission rate: 0.05-0.075
3. Vacuum tightness: P≤ 5.0*0.0001Pa
4. Stagnation tightness: 200
5. Average heat loss coefficient:0.50W(m2. °C. )
6. Heat preservation: 72 hours
7. Hail resistance: 20-30mm
8. Idle sunning property paramerers: Y=220-260. /KW