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Three target vacuum tube :
Vacuum tube: 3.3high borosilicate glass
The vacuum tube of our solar water heater has the high absorption rate and low emission rate,
The absorption rate is 0.93-0.96(AM1.5)
The emission rate is 0.04-0.06 (80℃±5℃)
Vacuum tightness is P≤5.0*0.0001Pa
Idle sunning property parameters is Y=260-300㎡.℃/KW
The average heat loss coefficient is Ult=0.4-0.6W(㎡.℃)
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Three target tube
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| Three target all glass vacuum tube property and specifications |
| Structure |
All Glass twin tube Co-axical Structure |
| Glass Material |
High borocillicate 3.3 Glass |
| External Pipe Diameter and thickness |
∮=58mm±0.7mm & thickness=1.6mm |
| Internal Pipe Diameter and thickness |
∮=47mm±0.7mm & thickness=1.6mm |
| Pipe Length |
1500mm, 1800mm |
| Absorptive Coating Property |
Structure |
Cu/SS-ALN(H)/SS-ALN(L)/ALN |
| Sediment Method |
Three target magnertron sputtering plating |
| Specific Absorption |
as=0.93～0.96(AM1.5) |
| Emmision Ratio |
∈h= 0.04～0.06 (800C±50C) |
| Vaccum tightness |
P≤5.0×10-3(Pa) |
| Iddle Shining Property Parameters |
Y=260～300m2·0C/KW |
| Solar Irradiation for obtaining a preset water temperature |
H≤4.7MJ/m2(∮=58mm) |
H=3.7～4.2MJ/m2 |
| H≤3.7MJ/m2(∮=47mm) |
H=2.9～3.2MJ/m2 |
| Average Heat Loss Coefficiency |
ULT=0.4～0.6W/(m2·0C) | | 
