The present invention relates to a heat exchanger (2) having a jacket (10) through which a first medium (A) can flow and which has at least one first inlet (11) and at least one first outlet (12), at least one tube (30) through which a second medium (B) can flow, the tube (30) being guided through the jacket (10) and having at least one second inlet (31) and at least one second outlet (32), wherein a deflection segment (50) or a plurality of deflection segments (50) are arranged in a row in a longitudinal axis (X) in the jacket (10), wherein the deflection segment (50) is formed from at least two partial sections (51, 52), which are arranged so as to overlap and cross, in areas, transverse to the longitudinal axis (X).

The invention relates to a fuel cell system (10) comprising at least one fuel cell stack (11) having an anode section (12) and a cathode section (13), an ejector (14), a fuel mixture line (15) for conveying a fuel mixture—containing primary fuel and secondary fuel—from the ejector (14) to the anode section (12), a primary fuel line (16) for supplying the primary fuel to the ejector (14), and a recirculation line (17) for returning the secondary fuel from the anode section (16) to the ejector (14), wherein at least sections of the primary fuel line (16) extend through a heat exchange volume (18) within the recirculation line (17) for a heat-transmitting connection between the secondary fuel and the primary fuel.

An indirect evaporative cooling air conditioner is provided, which includes a housing, multiple partition plates located in the housing and at least two heat exchangers arranged side by side. The multiple partition plates and the at least two heat exchangers separate the housing into multiple indoor air flow passages and multiple outdoor air flow passages, each heat exchange has a first heat exchange flow passage and a second heat exchange flow passage crosswise and independently arranged, the indoor air flow passages are in communication with the first heat exchange flow passages to form an indoor circulation passage, the outdoor air flow passages are in communication with the second heat exchange flow passages to form an outdoor circulation passage, and the fluid in the indoor circulation passages exchange heat with the fluid in the outdoor circulation passages through the at least two heat exchangers.

A heat exchanger (100) includes a flow path layer (10) in which a first flow path (11) extending in a first direction and a second flow path (12) extending in a second direction are disposed in the same layer. In each of the first flow path and the second flow path, a flow path cross-sectional area is reduced and expanded along an extending direction of the flow path. The first flow path and the second flow path intersect each other in the same layer in first portions (23, 33) of which the flow path cross-sectional area is reduced, due to displacement of the first portions (23, 33) in a third direction.

A heat exchanger includes a core. The core includes a first layer and a second layer. The first layer includes a first plurality of fluid inlets. The second layer includes a second plurality of fluid inlets. The heat exchanger also includes a fluid header attached to the core adjacent the first plurality of fluid inlets and the second plurality of fluid inlets. The fluid header includes an inlet, an outlet, a plenum between the inlet and the outlet, and a flow control mechanism within the plenum. The flow control mechanism selectively directs fluid through the first plurality of fluid inlets, through the second plurality of fluid inlets, or through both the first plurality of fluid inlets and the second plurality of fluid inlets.

A heat exchanger has a first plurality of passages extending in a first direction and to receive a first fluid and a second plurality of passages extending in a second direction, and to receive a second fluid, and the first plurality of passages being formed across a cross-sectional face of the heat exchanger, and there being distinct combined flow cross-sectional areas of the first plurality of passages in different locations across the cross-sectional face of the heat exchanger. A gas turbine engine and a method of forming a heat exchanger are also disclosed.

A flat tube for a heat exchanger may include a longitudinal-end inlet for letting a fluid into the flat tube, and a longitudinal-end outlet spaced apart from the inlet in a longitudinal direction for letting the fluid out from the flat tube. The flat tube may also include flow elements around at least a portion of which the fluid may be flowable around the flow elements in such a manner that the fluid may have a flow direction component perpendicular to the longitudinal direction. The outlet and the inlet each may be delimited on a partial cross-sectional area of the flat tube and arranged diagonally opposite one another.

A manifold structure and method of forming a structure having at least one enclosed cavity includes using an ultrasonic additive manufacturing (UAM) process to build up a solid component, forming a cavity in the solid component, filling the cavity with a sacrificial material, using a UAM process to build up a finstock layer over the cavity filled with the powder material to enclose the cavity and form the enclosed cavity, and removing the sacrificial material from the enclosed cavity after the finstock layer is ultrasonically welded to the solid component. The sacrificial material has an adequate density to support the UAM process of forming the finstock layer over the cavity and the material may be removed from the enclosed cavity, resulting in an enclosed cavity having smooth surfaces with an optimal fluid flow area therethrough.

A heat exchanger to cool an oil flow with an air flow and a fuel flow includes at least one oil flow layer to receive the oil flow, an air flow layer to receive the air flow, wherein the air flow layer is in thermal communication with the at least one oil flow layer, and a fuel flow layer to receive the fuel flow, wherein the fuel flow layer is in thermal communication with the at least one oil flow layer.

A system for power generation from renewable energy, comprising a heat exchanger within a subterranean formation. The heat exchanger comprises a casing at an upper portion of the wellbore, a tubular member extending through the casing to a lower portion of the wellbore, and fins in fluid communication with the casing and with the tubular member, the fins each comprising a volume defined by surfaces of the subterranean formation and configured to receive a fluid from the casing. Related longitudinal finned heat exchangers and methods of storing thermal energy within a subterranean formation are also disclosed.