Solar water heater vacuum tube
High Absorption (>0.96);
Low Emittance (<0.04);
High Thermal Efficiency;
Heating up quick
Solar water heater vacuum tube
1. High heat effectiveness: higher than normal all glass tube by 10%;
2. With small thermal capability, it can output power in 2 minutes, the highest temperature of cooling end can reaches 250 degrees, the average heat efficiency can still be 50% even under -50 degrees;
3. High efficient selective absorptive coating and vacuum heat insulation technology ensure the tube to get higher heat output in cloudy weather and in moist area, especially in winter.
Structure | All-glass double-tube co-axial structure | |
Glass material | High borosilicate 3.3 glass | |
External pip diameter and thickness | Φ=58±1.0mm§=1.8mm±0.2mm | |
Internal pip diameter and thickness | Φ=47±1.0mm§=1.6mm±0.2mm | |
Pipe length | 1800mm | |
Absorptive coating property | Structure | Cu/SS-ALN(H)/SS-ALN(L)/ALN |
Sediment method | 3 target magnetron sputtering plating | |
Specific absorption | As =0.93~0.96 (AM1.5) | |
Emission ratio | εh =0.04~0.06 (80±5) | |
Vacuum tightness | P≤5.0×10-3Pa | |
Idle sunning property parameters | Y=260~300 m2.C/KW | |
Solar irradiation for obtaining a preset water temperature | H≤4.7MJ/m2(Φ58) | H=3.7~4.2 MJ/m2 |
H≤3.7MJ/m2(Φ47) | H=2.9~3.2 MJ/m2 | |
Average heat loss coefficient | ULT=0.4~0.6W/(m2.) | |
