... 4mm-5mm thickness.3.Heat Exchanger of Copper Tubes with selective copper fins for great absorption4.Stand frame: Steel ... Outer tank:0.4-0.5mm galvanized steel3) Single copper or double copper coil exchangers inside tank4) Manifold: aluminum alloy with ... 58mm×1800mm6) Fittings: working station, safe valves, Controller, Copper ConnectorWorking Principles:1) Solar Absorption: Solar radiation is absorbed ...