1800mm solar evacuated tube

  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,  2100mm

Absorbing 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^-3Pa

  Idle sunning property parameters

  Y=220~260m2./KW

 Solar irradiation   for obtaining a   preset

water   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.)