all glass solar vacuum tube 3 target three layers

all glass solar vacuum tube 3 target three layers tri-element copper evacuated tubeLongquan Solar An experienced solar water heater factory with 19 years historyspecification:1.size:1):Ø47mmx1500mm 2):Ø47mmx1800mm 3):Ø58mmx1800mm 4):Ø58mmx1900mm 5):Ø58mmx2100mm2.Structure: all-glass double-tube co-axial structure3.Glass material: high borosilicate 3.3 glass4.Absorptive coating property:1)Structure:CU/SS-ALN(H)/SS-ALN(L)/ALN2)Sediment method:3 target magnetron sputtering plating 3)Specific absorption :as=0.93 0.96(AM1.5) 4)Emission ration:εh=0.04 0.06(80°c±1.5°c)5.Vacuum tightness:P<=5.0Χ10-³pa6.Idle sunning property parameters:Y=260 300m².°c/kw7.Solar irradiation for obtaining a preset water temperature: 1)H<=4.7MJ/m²(Φ58) H=3.7 4.2MJ/m² 2)H<=3.7MJ/m²(Φ47) H=2.9 3.2MJ/m²8.Average heat loss coefficient:ULT=0.4 0.6W/(m².°c)Solar Water Heater Tube Parameter size20' 40'HQØ47mmx1500mm4900PCS12000PCSØ47mmx1800mm4100PCS9900PCSØ58mmx1800mm2850PCS6900PCSAll glass vacuum tubes are made of inner tube and outer tube,between two tubes it is vacuum.For our tubes enjoy very good reputation among our users and have been widely used for home market and overseas.Detail of Picture