A heat exchanger is provided and includes parting sheets flat along a first axis and curved along a second axis perpendicular to the first axis, a fin sheet interposed between the parting sheets and corrugated along the first axis to form fins that are curved along the second axis and diffusion bonds formed along an entire length of a fin to diffusion bond the entire length of the fin to the parting sheets.

A compact radial condenser is disclosed. The compact radial condenser includes a first plate; a second plate; and a plurality of structures disposed between the first plate and the second plate. In the compact radial condenser, heat from a first fluid flowing between the first plate and the second plate and around the plurality of structures is transferred from the first fluid to at least one of the first plate, the second plate, or the plurality of structures. In the compact radial condenser, the plurality of structures includes a first set of structures, the first set of structures extending radially from an inner edge of an opening in the first plate to an outer edge of the first plate.