... fin evaporator,refrigerator part,al fin 2. heat exchange rate 3. the surface of special treatment,not easily oxidized Raw material:Copper tube ... plate δ0.8~1.5mm. Key process:Tube bending ,Punching the fins, Tube expanding,Degreasing,Welding and assembling, Leakage test, ... the cooling capability requirements. Note:(1) The inner grooved tube increases the heat exchange area and enhances the heat exchange ...