Bimetalic tubes

Aluminnium fins are rolled onto the base tube of optional material . Parameters: enternal diameter of base tube Dz = 12 - 38 mm diameter around fin D = 15 -70 mm; max. height of fin h= 16 m; lead of fin s = 1,5 - 4,5 mm; max. lenght of finned tube L = 12 m. Heatransfer coeficient between enternal tube and fins is 0,0002 m2. K/W.