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 centigrade

  Long time warranty to 15 years

  High level vacuum ensure operation under cold weather

 

Data sheet of solar vacuum tube

Material  borosilicate glass 3.3

Structure  All glass coaxial  double-layer  tubes

Material of coating    AlN/AIN-SS/Cu

Absorptance    0.94 to 0.96

Emittance        0.04 to 0.06

Vacuum            less than 5× 10-4pa

Stagnation  temperature  270 to 300 centigrade

Heat-loss  coefficient        less than 0.6w/ ㎡ *℃)

Bearing hailstone  ability  Hailstone  diameter  Ф25mm

Pressure-endure ability  1Mpa

The parameter of solar water heater:

Inner tank: SUS304-2B food grade stainless steel.
Outer tank: Galvanized steel + powder painting
Vacuum tube: Three-High vacuum tube its absorb rate is 94-96%

Type: 16, 18, 20, 24, 30, 36, 40 tubes

        47/1500mm, 58/1800mm, 58/2100mm vacuum tube

Bracket: galvanized steel plate with plastic spraying.
Heat preservation: 55-60mm imported PU; integral foaming can keep the water temperature last for 72 hours.

Capacity: 100-300 liter
Life span: 15years.
Freeze protection: -25℃

Wind stress: 180km/h without damage