Compact Non-Pressure Solar Water Heater

Single-target vacuum tube performance and specification:
Tube structure All-glass double deck co-axial structure
Glass material High borosilicate 3.3 glass
Tube length 47mmX1500mm,58mmX1800mm,
70mmX2000mm,70mmX2100mm etc

Single Target magnetron sputtering plating
Absorptivity: =0.900.93 (AM1.5)
Emission: =0.050.075(80±5)
Vacuum degree P≤5.0X10-3 (PA)
Stagnation temperature (temperature inside of empty evacuated tubes) 220260
Average heat loss ULT 0.60.7 W/(m2 *)
Pressure-endure 1MPa

Specifications
single target coating tube
high vacuum,long-term stability, with low cost and high efficiency and accept OEM
single target coating tube
Standard: high quality
Bearing hailstone ability: hailstone diameter 25mm
Pressure-endure ability: 1MPa
Description:
All glass evacuated tubes are the key component of solar collectors. The evacuated tube is similar to a conventional Dewar flask and consists of two borosilicate glass tubes, a glass with high chemical and thermal shock resistance. The outer side of the inner tube is coated with a sputtered solar selective surface. 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 virtually eliminate heat loss by conduction and convection.
The characteristics:
1. High solar-thermal conversion and low heat loss
2. Stable advanced coating up to 380 degree centigrade
3. Long time warranty to 15 years
4. High level vacuum ensure operation under cold weather