Various hot box fuel cell system components are provided, such as heat exchangers, steam generator and other components.

A heat exchanger includes a first flow circuit structure having at least a first portion defined by a plurality of conduits and a second flow circuit structure having at least a second portion disposed at the first portion such that walls of the second portion are disposed between the conduits and are free to move relative to the conduits. Fluid flowing through the first flow circuit structure is fluidically isolated from fluid flowing through the second flow circuit structure.

A heat exchanger assembly includes first and second annular ducts, first and second airflow pathways, and heat exchanger. The first airflow pathway is configured to transport a first airflow and is disposed within the first annular duct. The second annular duct is disposed radially outward from the first annular duct. The second airflow pathway is configured to transport a second airflow and is disposed between the first and second annular ducts. The heat exchanger includes inner and outer portions. The inner portion is disposed radially inward of the first annular duct and is fluidly connected to the first airflow pathway. The outer portion is disposed between the first and second annular ducts and is fluidly connected to the second airflow pathway. The heat exchanger is configured to cool a third airflow with both of the first and second airflows from the first and second airflow pathways.

A heat exchanger includes a heat exchanger body having a plurality of stacked panels defining an internal manifold and an external manifold. Each of the stacked panels includes an internal structure partially defining an internal manifold, an external structure partially defining the external manifold, and a plurality of ribs connecting the internal structure to the external structure. Each of the ribs further comprises a channel protruding into the rib and being paired with a corresponding rib of an adjacent panel, such that each of the ribs and the corresponding rib defining a cooling passage fluidly connecting the internal manifold to the external manifold. Each of the stacked panels is bonded to at least one adjacent stacked panel.

A heat exchanger includes a body shaped to integrate with one or more system structural elements and a plurality of first flow channels defined in the body. The heat exchanger also includes a plurality of second flow channels defined in the body. The second flow channels are fluidly isolated from the first flow channels. The first flow channels and the second flow channels have a changing flow direction characteristic along a direction of flow within the first flow channels and the second flow channels.

A method of installing a segment of a recuperator within an exhaust duct of a gas turbine engine, including positioning the segment such that its exhaust inlet is in fluid flow communication with the turbine section and its exhaust outlet is adapted to deliver an exhaust flow to atmosphere, engaging its air inlet to a plenum in fluid flow communication with the compressor discharge, and engaging its air outlet to another plenum containing the combustor. One of engaging the air inlet and engaging the air outlet includes forming a rigid connection providing sealed fluid flow communication with the corresponding plenum, and the other of engaging the air inlet and engaging the air outlet includes forming a floating connection providing sealed fluid flow communication with the corresponding plenum. The floating connection allows relative movement of the segment within the exhaust duct.

An aircraft engine nacelle in which the inner fixed structure has a heat exchanger which is filled with a two-phase heat transfer fluid and which comprises a tube forming a loop with front, rear, lower and upper strands, and also a first complementary strand between the central zones of the front strand and of the upper strand, a second complementary strand between the central zones of the front strand and of the lower strand, a third complementary strand between the central zones of the rear strand and of the upper strand, and a fourth complementary strand between the central zones of the rear strand and of the lower strand.

A heat exchanger includes a heat exchanger core, a pressure housing, and a flex beam. The pressure housing at least partially defines a core chamber. The flex beam extends between and connects the heat exchanger core and the pressure housing such that the heat exchanger core is suspended away from the pressure housing within the core chamber by the flex beam. The flex beam includes a core end connected to the heat exchanger core and a housing end spaced along the flex beam from the core end and connected to the pressure housing.

A heat exchanger comprises a seamless body, and the seamless body may include a substantially cylindrical configuration defining a radial direction, a circumferential direction, a longitudinal axis, a first cylindrical wall and a plurality of fins. Each fin may extend at least partially in the radial direction and helically along the longitudinal axis. Also, each fin may be at least partially hollow defining an internal flow passage, and each fin of the plurality of fins may be at least partially spaced away from an adjacent fin, defining an external flow passage.

A plate for use in a heat exchanger is includes: a first surface; a second surface; first, second and third discrete flow passages passing through the plate from the first surface to the second surface, the second flow passage extending around the first flow passage and the third flow passage extending around the second flow passage. A plurality of fins extend parallel to the first surface across the third flow passage and have a first surface extending parallel to the first surface of the plate and a second surface extending parallel to and spaced from the first surface of the fin; and one or more pins protruding from the first surface of at least some of the fins. The pins extend away from the second surface of the fins.