Vakuumröhre für Solarwarmwasserbereiter

evacuated tube, for solar collector, solar water heater Structure All-glass double-tube co-axial structureGlass material High borosilicate 3.3 glassExternal pipe diameter and thickness Φ=58±0.7mm &=1.6mmInternal pipe diameter and thickness Φ=47±0.7mm &=1.6mmPipe length 1800mmAbsorbing coating property Structure Cu/SS-ALN(H)/SS-ALN(L)/ALN 3 target magnertron sputtering plation Sediment method as=0.93 0.96(AM1.5) εh=0.04 0.06(80±5) Specific absorption Emission ratioVacuum tightness P≤5.0X10-3PaIdle sunning property parameters Y=260 300m2./KWSolar irradiation for obtaining a preset water temperature H≤4.7MJ/m2(Φ58) H=3.7 4.2MJ/m2 H=2.9 3.2MJ/m2 H≤3.7MJ/m2(Φ47)Average heat loss coefficient ULT=0.4 0.6W/(m2.