solar water heater

solar water heater
1.resist high temperature.
2.contain no heavy metal.
3.high light transparency.
solar water heater
This type of selective coating (SS-C/Cu) can withstand very high temperature. This is important because the tube is exposed in high temperature to evacuate the gas in the jacket between the inner tube and the outer tube. The solar energy absorption ability should be above 92%.


Specification
Structure
All glass double concentric tubes
Material
Borosilicate glass 3.3
Outer tube diameter
Φ47±0.7.mm &=1.6mm Φ58±0.7.mm &=1.6mm
Length
47mm-1500mm/1600mm/1800
58mm-1500mm/1600mm/1800mm/2000mm/2100mm
coating
CU/SS-ALN/ALN
Absorption rate after evacuating
α= 0.93–0.96(AM1.5)
Emission rate after evacuating
ε= 0.04–0.06(80°C±5°C) (AM1.5)
Vacuum degree
P≤5.0×10­¯³Pa
Average heat loss conficient
U
LT
= 0.4-0.6w(m².°c)
Max stagnation temperature
270°C-310°C
Service life
15 yaears
Pressure
0.6MPa
Impact Resistance
Φ≤25mm