vacuum tube :the absorbing rate of vacuum tube up to 0.98. Absorbing rate D58*1800mm exceeds 20% than D47*1500mm type vacuum tubeStructure All-glass double-tube co-axial structureGlass materialHigh borosilicate 3.3 glassExternal pipe diameter and...

heat pipe vacuum tubes: 1.A perfect combination of the vacuum tube and the heat pip; 2.High heat efficiency. heat pipe vacumm tubeWorking principle:The selective coating on the inner cover of the evacuated tubes converts solar energy into heat energy and transfer heat to the...