Product Description

Item name: Normal solar vacuum tube Structure: All-glass double-tube co-axial structure *7mm*1.5m/*8mm*1.8m Glass material: High borosilicate 3.3 glass External pipe diameter and thickness:dia.=*7?0.7mm &=1.6mm, ida.=*8?0.7mm &=1.6mm Internal pipe diameter and thickness:dia.=*7?0.7mm &=1.6mm, ida.=*7?0.7mm &=1.6mm Pipe Length: ***0mm/***0mm Absorptive coating property: Structure: AL/AL-ALN(H)-ALN(L)/ALN Sediment method: Single target magnertron sputterig plating Specific absorption: as=0.*0~0.*3(am1.5) Emission ratio:0.*5~0.**5(*0?5) Vacuum tightness: P≤5.0****0Pa Idle sunning property parameters: Y=**0~**0m2/KW Solar irradiation for obtaining a preset water temperature: H≤4.7MJ/m2(dia.*8) H=4.1~4.4MJ/m2 H≤3.7MJ/m2(dia.*7) H=3.1~3.4MJ/m2 Average heat loss coeffieient: ult=0.6~0.7W/(m2)