solar vacuum tube

solar vacuum tube single target or three target

solar vacuum 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

                                        &sp;         &ampbsp;      Φ=70±0.7mm £=2.0mm

internal pipe diameter and thickness: Φ=37±0.7mm £=1.6mm  Φ=47±0.7mm £=1.6mm

                                                     &amnbsp; Φ=58±0.7mm £=1.6mm

pipe length : 800mm 1200mm 1500mm 1600mm 1800mm 1900mm 2000mm 2100mm

absorptive coating structure :AL-N/AL selective absorbing coating

absorptive coating sediment method: single target magnertron sputtering plating

specific absorption: as =0.90-0.93(AM1.5)

emission ratio: εh=0.05-0.075(80oC±5oC)

vacuum tightness: P&amps: P≤5.0×10-3Pa 

idle sunning property parameters: Y=220-260m2.oC/KW

average heat loss coefficient: ULT=0.6-0.7W/(m2.oC)

solar vacuum tube