... simple2.Solar abshrough the header,orption: solar radiation is absorbed by the solar tubes and converted into heat3.Solar heat transfer ... the water cirulates through the header, the temperatures is raised by 5-10C. Throughout the day, the water in the tank is ... SS-AL-Nx/Cu selective absorption coating,Vacuum Degree,P<=5*10-4,Service Life,10 years Mounting FrameAluminum Alloy,Thickness ...