solar water heater vacuum tubes

technology:Use of the interference film
Performance:with high absorptivity and low emittance
Performance:serve longer life

This is three-target solar vacuum tube ,with the inner is red
It has three layers.Cu .Al and Stainless stell .
1). we adept the advanced magnetron sputtering plating to make sure gain high absorptivity and low emittance.
2) We used Stainless steel ion instead of Aluminum Whiich can endure hight
temperature
.
3).the Interference film changed little in high
temperature

The three-target solar vacuum tubes has two color:blue and purple
1
).Highly efficient absorber of high performance with daily average effciency over 40%-50%.
2).Start up quickly heat pipe transfer the heat energy into the storage tank in one condition.
3).With stand pressure of 0.6Mpa,can be connected directly with city water pipe

We are OEM offered.packed by carton with PE fom insinde ,Prevent damage the product.
the outer Glass Tube Diameter:47 the length is :1.2--2.1m could packing with 15\18\20\24pieces/carton
the outer Glass Tube Diameter:58/70 the length is:1.2--2.1m could paking with 8/10/12/15 pieces/carton or packing as you need
Category
Single- target
vacuum tubes
Tri-element Hitech vacuum tubes
Three- target
tubes
External pipe diameter and thickness
Φ=47±0.7mm
&=1.6mm
Φ=58±0.7mm
&=1.6mm
Φ=70±0.7mm
&=1.6mm

Internal pipe diameter and thickness
Φ=37±0.7mm
&=1.6mm
Φ=47±0.7mm
&=1.6mm
Φ=58±0.7mm
&=1.6mm

Sediment method
Single target magnetron sputtering plating
Three target magnetron sputtering plating
Three target magnetron sputtering plating
Specific absorption
a=0.90~0.93 (AM1.5)
a=0.93-0.96
(AM1.5)
a=0.92~0.96
(AM1.5)
Emission ratio
ε=0.05~0.075
(80°C±5°C)
ε=0.04~0.06
(80°C±5°C)
ε=0.04~0.06
(80°C±5°C)
Vacuum tightness
P≤5.0×10
-3
Pa
Average heat loss coefficient
U=0.6~0.7W/(m².°C)
U<=0.6 W/(m².°C)
U=0.4~0.6W/(m².°C)
Packaging
Carton
Routine Packaging:8 or 10 or 12 pc /carton
Special Packaging: According to what customs need

Heat pipe details
Dimension
Special size
Pipe length for evacuated tube
1200 1500 1600 1800
Special length available
Diameter
Φ=8mm
Φ=10 or 12
Thickness of absorbance pipe
&=0.7mm
Between 0.5 and 0.8
Diameter of pipe condenser
Φ=14mm
Between14 and 24