Three Target Vacuum Tube (ILVT Series)

Three-target glass vacuum tube, high efficiency and good performance, especially for solar energy collecting to heat hot water Working Principle All-glass solar vacuum tube, connecting with water tank or manifold, when it works, cold water flows down into the vacuum tube, and there it is heated with solar energy absorbed by the coating outside of inner vacuum tube, the solar will be absorbed efficiently by the coating with little loss of heat because of the vacuum between the inner and outer glass tubes, and when cold water becomes hot, hot water will rise up to water tank or manifold because of the larger proportion to cold water, cold water again flows into solar vacuum tube for another heating process.   Structure  All-glass double-tube co-axial structure  Glass material  High borosilicate 3.3 glass  External pipe diameter and thickness  Φ=47±0.7mm  &=1.6mm,    Φ=58±0.7mm  &=1.6mm,   Φ=70±0.7mm &=2.0mm  Internal pipe diameter and thickness  Φ=37±0.7mm &=1.6mm,    Φ=47 ±0.7mm  &=1.6mm,   Φ=58±0.7mm &=1.6mm  Pipe length  800mm,    1200mm,  1500mm,  1600mm,  1800mm,  1900mm,  2000mm,  2100mmAbsorbing coating property Structure  AL/AL-ALN(H)/AL-ALN(L)/ALN Sediment method Single target magnetron sputtering plating Specific  absorption  as=0.90~0.93(AM1.5) Emission ratio  εh=0.05~0.075(80±5)  Vacuum tightness  P≤5.0X10 -3 Pa  Idle sunning property parameters  Y=220~260m2./KW Solar irradiation   for obtaining a   presetwater   temperature  H≤3.7MJ/m2(Φ47)  H=4.1~4.4MJ/m2  H≤4.7MJ/m2(Φ58)  H=3.1~3.4MJ/m2  Average heat loss coefficient  ULT=0.6~0.7W/(m2.)/* March 10, 2023 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(",").forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1