The absorber of the solar water heater. It absorbs solar energy and convert it into heat into water for use in water heating;
Solar Vacuum tube:
I.Features:
The absorber of the solar water heater. which absorbs solar energy and convert it into heat then transfor the heat into water for use in water heating.It is the most improtant part of the solar water heater.
It consists of two borosilicate glass. the inner tube is coated with a sputtered solar selective coating (Al-N/Al) or (Al-N/AL/SS/CU), this coated inner tube is closed at one end and sealed at the other end to the outer tube.
the annular space between the outer tube and inner tube is evacuated to virtualy eliminate heat loss by conduction and convection. And the outer tube is transparent allowing light rays to pass through with minimal reflection.This "evacuation" of the gasses forms a vacuum, which is an important factor in the performance of the evacuated tubes.
II.Working principle:
III.Specifications:
TECHNIC SPECIFICATION | ||
Models | 47*1500 | 58*1500 |
Weight | 1.35±0.12kg | 2.29±0.18kg |
Structure | All-glass-tube coaxial structure Double-layer tubes | All-glass-tube coaxial structure Double-layer tubes |
Outer tube diameter | Dia47±0.7mm | Dia58±0.7mm |
Inner tube diameter | Dia37±0.7mm | Dia47±0.7mm |
Outer tube thickness | 1.6±0.15mm | 1.6±0.15mm |
Outer tube thickness | 1.6±0.15mm | 1.6±0.15mm |
Tubes length | 1542±4mm | 1512±4mm |
Material of coating | AL/N/AL | AL/N/AL |
Absorptive coating property
| 0.90~0.93(AM1.5) | 0.90~0.93(AM1.5) |
0.05~0.75(80°C±1.5°C) | 0.05~0.75(80°C±1.5°C) | |
Vacuum tightness | P≤5×10-3 Pa | P≤5×10-3 Pa |
Transmittance of outer Tube | 0.91 | 0.91 |
Stagnation temperature | 270-300°C | 270-300°C |
Heat loss coefficient | ≤0.6W/M2 | ≤0.6W/M2 |
Solar irradiation for obtaining a preset water temperature | H≤4.7MJ/M2(Dia47) H≤4.7MJ/M2(Dia58) | H=3.1-3.4J/m2 H=4.1-4.4J/m2 |
Bearing hailstone ability& Pressure-endure ability | Hailstone diameter 25mm & 1MP | Hailstone diameter25mm & 1MP |
Average heat loss coefficient | ULT=0.6~0.7W/(M2. °C) | |
Evacuated tube
