259-Solar-Vakuumröhre

solar glass vacuum tube,red Structure All-glass double-tube co-axial structure Glass material High borosilicate 3.3 glass External pipe diameter and thickness dia.=47±0.7mm &=1.6mm dia.=58±0.7mm &=1.6mm dia.=70±0.7mm &=2.0mm Internal pipe diameter and thickness dia.=37±0.7mm &=1.6mm dia.=47±0.7mm &=1.6mm dia.=58±0.7mm &=1.6mm Pipe length 1500mm 1600mm 1700mm 1800mm1900mm 2000mm Absorptive coating property Structure Cu/SS-ALN(H)/SS-ALN(L)/ALN Sediment method 3 target magnetron sputtering plating Specific absorption as=0.93 0.96(AM1.5) Emission ratio 0.04 0.06(80±5) Vacuum tightness P≤5.0×10-³Pa Idle sunning property parametersY= 260 300m²/KWSolar irradiation for obtaining a preset water temperatureH≤4.7 MJ/ m²(dia.58) H=3.7 4.2 MJ/ m²H≤3.7 MJ/ m²(dia.47) H=2.9 3.2 MJ/ m²Average heat loss coefficientUlt=0.4 0.6W/( m².)