Heat exchanger and method for manufacturing same

A method for manufacturing a heat exchanger including a partition wall that has a bottomed tubular container shape and separates two fluids having different temperatures, wherein:

• the partition wall includes a side circumferential portion in a cylindrical shape, and a bottom portion configured to close an opening on one side of the side circumferential portion;
• a plurality of fins are formed on the outer surface of the partition wall and arranged in a circumferential direction around a center of a cylinder of the side circumferential portion;
• each of the fins includes a base portion connected to an outer surface of the bottom portion;
• the base portions of the plurality of fins all extend from the outer surface of the bottom portion in a radial direction around the center of the cylinder of the side circumferential portion, and are arranged side by side in the circumferential direction on the outer surface of the bottom portion;
• plate-shaped members are provided between the base portions of the fins adjacent in the circumferential direction, and fixed to the outer surface of the bottom portion;
• and
• the method comprises:
• integrally molding the partition wall and the plurality of fins by additive manufacturing with powder;
• and
• forming the plate-shaped members provided between the fins adjacent in the circumferential direction with a different material of higher emissivity or heat resistance than the material of the fins and fixing the plate-shaped members to an outer surface of the bottom portion.

A heat exchanger comprising

• a partition wall that has a bottomed tubular container shape and separates two fluids having different temperatures, wherein:
• the partition wall includes a side circumferential portion in a cylindrical shape, and a bottom portion configured to close an opening on one side of the side circumferential portion;
• a plurality of fins are formed on an outer surface of the partition wall, and arranged side by side in a circumferential direction around a center of a cylinder of the side circumferential portion;
• each of the fins includes a base portion connected to an outer surface of the bottom portion;
• the base portions of the plurality of fins are formed side by side in parallel;
• plate-shaped members are provided between the base portions of the adjacent fins, and fixed to the outer surface of the bottom portion;
• the partition wall and the plurality of fins are integrally molded of a same material;
• and
• the plate-shaped members are formed of a different material of higher emissivity or heat resistance than the material of the fins.