tri-element vacuum tube

1)all glass hard borosilicate :3.3 2)high efficient selective absorption coating: SS-C/CU &AL/N

tri-element vacuum tube  specifications  as  follows:

1)all glass hard borosilicate:3.3

2)high efficient selective absorption coating: SS-C/CU&AL/N

3)size of vacuum tube:47mm*1500mm  and 58mm*1800mm and 70mm*2100mm

the concrete specification as follows:

Model:AJ47/1500 AJ58/1800 AJ70/2100

Specification:

1)      Glass material: Borosillicate glass 3.3

2)      Glass thickness:1.6mm

3)      Absorption coefficient more than90%(92%)

4)      Aborbtive coating:SS-C/CU&A;/N

5)      Emission coefficient :less10%(8%)

6)      Vacuum:less than 5*10-2 Pa

7)      Stagnation temperature: mor than220 Celsius

8)      Hail resistance:25mm

9)      Freezing resistance:-35 Celsius

Structure		Dual concentric geometry tube
Material of glass		hard borosilicate:3.3
Diameter and thickness of outer tube		Ø58±0.5mm&1.6mm
Diameter and thickness of inner tube		Ø47±0.5mm&1.6mm
Length of vacuum tube		1800mm(±mm)
Properties of absorptive coating	Coating method	selective absorptive sputtering coating: SS-C/cu & AL/N
	Transmissivity t≥ 0.89(AM1.5)	0.913
	Absorptance α≥ 0.86(AM1.5)	0.930
	Emissivity  εh≤0.080(30degree±5degree)	0.026
Pressure of vacuum tube   p≤5×10-2 Pa		5×10-3Pa
Stagnation parameter Y>250sqm·degree/kW		246.3
Solar radiance   H<4.7MJ/sqm		4.59
Average heat loss coefficient: ULT<0.8W(sqm·degree)		0.721
Lifetime		15 years

tri-element vacuum tube