Heat exchanger assembly formed of a lattice structure with a plurality of shell structure unit cells

A method of manufacturing a heat exchanger assembly for a rotary machine, the method comprising:

• forming a lattice structure having a plurality of shell structure unit cells with at least one junction and a plurality of connectors coupled to the at least one junction, the at least one junction and the plurality of connectors forming an integral surface;
• and
• forming a fluid boundary wall within the lattice structure to define an active heat exchanger portion of the heat exchanger assembly and an inactive heat exchanger portion of the heat exchanger assembly, wherein at least one of the plurality of shell structure unit cells extends through and beyond the fluid boundary wall;
• and
• providing at least one working fluid within the fluid boundary wall.

An additively manufactured lattice structure, comprising:

• a plurality of shell structure unit cells, each of the plurality of shell structure unit cells comprising at least one junction and a plurality of connectors coupled to the at least one junction, the at least one junction and the plurality of connectors forming an integral surface;
• and
• a boundary wall defined within the lattice structure;
• wherein at least one of the plurality of shell structure unit cells extends through and beyond the boundary wall to define a first region configured to house a working fluid and a second region fluidly separated from the first region and configured to lack the working fluid.