231 solar tube with copper

solar tube with copper Vacuum tube MaterialHigh boron silicate glass Thickness1.8±0.2mm Length1800mm Dia. Of cover tubeΦ58mm Dia. Of absorbe tubeΦ47mm Absorption≥95% Reflection capacity≤7% Average coefficient of heat loss0.69W/.c Vacuum capacity5 x 10-3 Pa Compression resistance0.6MPa Heat Transferring finAluminim 0.30mm in thickness Exposure Temperature Without media inside 250°C Exposure Temperature With media inside120°C Connection box FrameAluminium alloy Insulation Material Fluorine-free polyurethane Liquid passage U riser tubes(Copper)φ8 mm×δ0.75mm Header tubes(Copper)φ15 mm×δ0.8mm Working pressure0.6Mpa Test pressure1.2Mpa Heat carrier volume1.9L Performance Daily heat collection (solar radiation17MJ/)7.35MJ/ Recommended circulation mediaGlycol / Water Circulation Volume1 2 L /minute