Evacuated Vacuum Tube
Vacuum tubes consists of two glass tubes outer tube and inner tube.
Outer tube is made of extremely strong transparent borosilicate
glass and adopted magnetism control.
Inner tube is made of borosilicate glass.
Excellent solar heat absorption
Intercept efficiency: > 93%
Low heat reflection properties: Main types of vacuum tube: 47 x 1,
500, 58 x 1, 800, 70 x 2, 000 and 70 x 2, 100mm
Stagnation temperature: 180 to 190 degrees Celsius
Heat insulating time: 72 to 80 hours&