| 摘要 |
A brazed aluminum counter-flow heat exchanger particularly suited for use in Ocean Thermal Energy Conversion is produced by assembling and welding subassemblies of corrugated fins that were previously vacuumed brazed in a stacked group. After the brazing operation, the stacked group of subassemblies are later separated and rearranged to create a subsequent stack of alternating layers of corrugated layers and layers having wide open saltwater passageways. To complete the unit, a friction stir welding process provides final exterior weld seams that penetrate to the internal saltwater passageways in the heat exchanger. The full weld penetration eliminates corrosion-conducive crevices at the welded joints, thus making the aluminum heat exchanger suitable for saltwater use. |
