Heat Pipe Pressurized Solar Collectors

Specifications:
1) Inner manifold material: Red copper channel
2) Outer shell material of manifold: Aluminium alloy
3) frame material: Aluminium alloy
4) Heat pipe material: 99.93% pure cooper & lead free, 45% silver brazing
5) Rubber Seals and rubber Rings: HTV grade silicone rubber
6) Optional installation angle: 0 , 30 , 38 , 45
7) Maximum Operating Pressure: 12 bar
8) Optional flow rate: 0.1L/min/tube 0.026G/min/tube
9) Vacuum tube:  47-1500mm,  58-1800mm with heat pipe
10) Daily efficiency: ≥ 55% (≥ 42% in winter)
11) Hailstone resistance: Dia≤ 25mm
12) Heat pipe anti-freezing: ≥ -35oC
13) Life span: Approximate to 15 years

http://www.qr-solar.org/heat-pipe-pressurized-solar-collectors.html