Dual-target solar vacuum tubes Absorption, high efficiency, high vacuum, thermal insulation is good, anti-aging

Structure Entire glass double barrel coaxial structures Material           Glass tube material: borosilicate glass 3.3 Outside diameter     Φ47±0.7mm  &=1.6mm Φ58±0.7mm  &=1.6mm Internal diameter     Φ37±0.7mm  &=1.6mm Φ47±0.7mm  &=1.6mm Specification length      47-1500mm/1600mm/1800mm 58-1500mm/1600mm/1800mm/2000mm/2100mm Selective absorber coating material    Cu SS-ALN(H)/SS-ALN(L)/ALN Solar absorption efficiency     0.90~0.95(AM1.5) Launch ratio     0..04~0.06(80oC±5oC) vacuum degree         P≤3.0×10¯³(Pa) Maximum stagnation temperature    260~300oC Average heat loss coefficient        ULT =0.4~0.6w/(m2.oC) Resistance performance         Φ≤ 25mm 

All-glass double-target magnetron sputtering of copper steel film solar vacuum tube