THREE TARGET COPPER(CU) BASED SOLAR HEATER VACUUM TUBES

vacuum tube:
1, CE, ISO, 3C certificate.
2, stabel and reliabel manufacture.
3, competitive price: usd 1.35-6.35
COPPER(CU) BASED SOLAR HEATER VACUUM TUBE

1, Structure: double-layer glass tube, co-axial
2, Glass material: high borosilicate 3.3 glass.
3, Coating material: CU/SS-ALN(H)/SS-ALN(L)/ALN
4, Specific absorption: as = 0.92-0.96(AM1.5)
5, Average heat loss: 0.4-0.6/Wm2.C
6, Emission retie:0.04-0.06(80C)
7, Hail resistance:25mm
8, Pressure resistance: 1Mpa
9, Vacuum tightness: 50 x 0.001 Pa max.
10,Stagnation temerature: 260-300C

Outter tube diameter
1)47mm (with glass thickness 1.6mm)
2)58mm (with glass thickness 1.6mm)
3)70mm (with glass thickness 2.0mm)

Inner tube diameter
1)37mm (with glass thickness 1.6mm)
2)47mm (with glass thickness 1.6mm)
3)58mm (with glass thickness 1.6mm)