Solar water heater

Solar heater Three Target vacuum tube with CU/SS-ALN(H)/SS-ALN(L)/ALN, Adding one more complete glass tube in the normal tube, raising the heating efficiency by decreasing the water content, not the heating area, The heating efficiency can improve 30% by this way. 1. Structure: all-glass double-tube co-axial structure 2. Glass material: high borosilicate 3.3 glass 3. External pipe diameter and thickness: Φ=47±0.7mm &=1.6mmΦ=58±0.7mm &=1.6mmΦ=70±0.7mm &=2.0mm 4. Internal pipe diameter and thickness: Φ=37±0.7mm &=1.6mmΦ=47±0.7mm &=1.6mm Φ=58±0.7mm &=2.0mm 5. Pipe length: 800mm1200mm1500mm1600mm1800mm1900mm2000mm2100mm 6. Absorbing 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: εh=0.04 0.06(80±5) 7. Vacuum tightness: P≤5.0X10-3Pa 8. Idle Sunning property parameters: Y=260 300m2./KW 9. Average heat loss coefficient: ULT=0.4 0.6W/(m2.)