3 target all-glass vacuum heat collection tube

1.structure:all-glass double-tube co-axail structure2.High borosillicate 3.3 glass3.absorptive coating property:   a.structure: Cu/SS-ALN(H)/SS-ALN(L)/ALN   b.sediment method:3 target magnertron sputtering plating   c.specific absorption:0.93~0.96(AM1.5)   d.emission ratio:0.04~0.06(80oC±5oC )4.idle sunning property parameters:Y=260~300m2.oC/KW5.solar irradiation for obtaining a preset water temperatureH=3.7~4.2MJ/m2(Φ58)  H=2.9~3.2MJ/m2( Φ47 )6.Average heat loss coefficient:0.4~0.6W/(m2.oC)THE CURRENT PRODUCTS MAINLY INCLUDE:DIAMETER Φ47mm Φ58mm Φ70mm ,length  1200mm 1500mm 1600mm 1700mm 1800mm 1900mm 2000mm 2100mm,
3 target all-glass vacuum heat collection tube