All glass evacuated tube

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. Himin evacuated collector tubes are produced according to two new patents from the Sydney University exclusively licensed to our company.

Features:

High solar-thermal conversion and low heat loss

Stable advanced coating up to 380℃

 Long time warranty to 15 years

 High level vacuum ensure operation under cold weather

Data sheet of solar water heater

Material  borosilicate glass 3.3

Structure  All glass coaxial  double-layer  tubes

Material of coating   AlN/AIN-SS/Cu

Absorptance   0.94~0.96

Emittance     0.04~0.06

Vacuum     P≤5×10-3pa

Stagnation  temperature  270~300℃

Heat-loss  coefficient    ≤0.6w/ ㎡ *℃)

Bearing hailstone  ability  Hailstone  diameter  Ф25mm

Pressure-endure ability  1MPa