heat pipe vacuum tube

heat pipe vacuum tube Structure All glass double-tube co-axial structureGlass materialHigh borosilicate 3.3 glassExternal pipe diameter and thicknessΦ=47±0.7mm &=1.6mm Φ=58±0.7mm &=1.6mm Φ=70±0.7mm &=2.0mmInternal pipe diameter and thicknessΦ=37±0.7mm &=1.6mm Φ=47±0.7mm &=1.6mm Φ=58±0.7mm &=1.6mmPipe length1200mm 1500mm 1600mm 1800mm 2000mm 2100mmAbsorption coating propertyStructureCu/SS-ALN(H)/SS-ALN(L)/ALNSediment method3 target magnetron sputtering platingSpecific absorption0.93 0.96Emission ratio0.04 0.06Vacuum tightness5.0*10–³PaIdle sunning property parameters260-300m2°c/kwSolar irradiation for obtaining a preset water temperetureH≤4.7MJ/m2Φ=58H=3.7-4.2ML/m2H≤3.7MJ/m2Φ=47H=2.9-3.2MJ/m2Average heat loss coefficient0.4-0.7W/m2°cResist hailstoneΦ=25mmResist coldminus 30 degreeResist wind30m/slife Aged15 years