Model

Three-target solar water heater tube

Single-target vacuum tube

Structure

All-glass double-tube co-axial structure

Glass material

High borosilicate 3.3 glass

Diameter x length

47x1500mm,1.6mm thickness, inner tube diameter:37mm

58x1800mm,1.6mm thicnkess, inner tube diameter:47mm

70x2000mm,2.0mm thickness,inner tube diameter:58mm

Structure

Cu/SS-ALN(H)/SS-ALN(L)ALN

AL/AL-ALN(H)AL-ALN(L)/ALN

Sediment method

Three target magnetron sputtering plating             

Single target magnetron sputtering plating

Specific absorption

93%-96%(AM1.5)

90%-93%(AM1.5)

Emission ratio

0.04-0.06(80C+-5C)

0.05-0.075(80C+-5C)

Vacuum tightness

<=5.0x10 -3Pa

<=5.0x10-3Pa

Idle suning property parameters                          260-300m2.C/KW

Heat-loss coefficient

0.4-0.6W/(m2.C)

 0.6-0.7 W/(m2.C)

Preeure-endure ability

0.6Mpa

Thermal expansion

3.3x10-6K