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
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