Three target solar vacuum tube has property and spec. as following:

1. All-glass double-tube co-axial structure, high borosilicate 3.3 glass ;

2. Transmission Ratio of the Outer Glass Tube;

3. Structure: Cu/SS-ALN(H)/SS-ALN(L)/ALN.

4. Sediment method: 3 target magnertron sputtering plating ;

Comparing to Al-N-Al vacuum tube, it has advantages in cold area as following:

a. Absorbance: 12% higher.

b. Emission Ration: 30-49% lower.

c. In alpine area, copper ions emission ration is lower than that of aluminum ion. So it could work properly even circumstance temp. is lower than -30Deg C.

d. Stainless steel ion has performance of high temp. resistant, anti-stagnation temp. coating will not decay or get aging or disappears.

Dia. 47 with length of 1500mm.

Dia. 58 with length of 1600mm

Dia. 58 with length of 2000mm

Dia. 58 with length of 2100mm.