A heat exchanger including a pipe bundle to guide a fluid between first and second pipe connectors, the pipes being distributed in layers of pipes, wherein pipes of each of the layers of pipes each includes two bends, wherein a length of a flow path section is at least 1.7 times greater than lengths of two other flow path sections. A first bend of the two bends is provided between the longer flow path section and a first of the shorter flow path section, and wherein a second of the two bends is provided between the first, shorter flow path section and the other shorter flow path section, and wherein each of the layers of pipes includes two pipe subgroups. The second bend in one of the pipe subgroups in the pipe layer is opposite to the second bend-in the other pipe subgroup of the same pipe layer.

The present disclosure provides a louvered fin including a leading edge, a trailing edge, and a surface extending between the leading edge and the trailing edge. The surface defines a first set of holes along a first axis, a second set of holes along a second axis and offset from the first set of holes, and a third set of holes along a third axis and offset from the second set of holes. Each of the first axis, the second axis, and the third axis extends substantially parallel to a longitudinal axis of the fin. A first offset distance between the second and first set of holes is greater than a second offset distance between the third and second set of holes. The second and the third set of holes define a substantially obtuse trapezoidal matrix.

An improved indirect heat exchanger including a plurality of coil circuits, with each coil circuit comprised of an indirect heat exchange section tube run or plate. Each tube run or plate has at least one change in its geometric shape or may have a progressive change in its geometric shape proceeding from the inlet to the outlet of the circuit. The change in geometric shape along the circuit length allows simultaneously balancing of the external airflow, internal heat transfer coefficients, internal fluid side pressure drop, cross sectional area and heat transfer surface area to optimize heat transfer.

A heat exchanger having a first core with a first end and a second end and having a first plurality of hot flow channels fluidly isolated from a first plurality of cool flow channels. The first plurality of hot flow channels and the first plurality of cool flow channels can be arranged in a first checkerboard pattern. The heat exchanger also having a first header connected to the first end of the first core, a first hot flow inlet section connected to the first plurality of hot flow channels, and a first curved portion with a first inner hot flow route that is longer than a first outer hot flow route. The first header also having a first cool flow outlet section connected to the first plurality of cool flow channels with the first cool flow outlet section being fluidly isolated from the hot flow inlet section.

Exemplary embodiments are directed to swimming pool heat exchangers including a housing and one or more tube assemblies disposed within the housing. Each of the tube assemblies includes an elongated titanium tube and at least one fin welded to an outer surface of the elongated titanium tube. The elongated titanium tube and the at least one welded fin allow for corrosion resistance to swimming pool water while simultaneously allowing for improved heat transfer from the heat exchanger to the swimming pool water.

An aircraft heat exchanger arranged longitudinally and including a casing with an inner chamber configured so that coolant flows longitudinally from an inlet to an outlet, a plurality of laterally spaced longitudinally extending inner chamber plates, and a plurality of channels defined between contiguous plates. Each plate includes a leading edge oriented towards the inlet and configured to divert coolant towards the channels. A plurality of the plates include an inner hollow area configured to conduct a flow of hot bleed air therethrough. Leading edges of a first group of plates are arranged in a stepped pattern. A gap defined between the first group of plates and a first casing lateral wall establishes a fluid coolant communication through the first group of plates between the casing inlet and outlet. The lateral distance between each leading edge of the first group of plates and the first lateral wall decreases longitudinally.

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 heat exchanger includes a first fluid pathway enclosed in a heat exchanger body to convey a first fluid through the heat exchanger body and a second fluid pathway enclosed in the heat exchanger body to convey a second fluid through the heat exchanger body and facilitate thermal energy exchange between the first fluid and the second fluid. The first fluid pathway and the second fluid pathway together are arranged in a spiral arrangement extending along a central axis of the heat exchanger.

A heat exchanger is provided including a first manifold and a second manifold separated from the first manifold. A plurality of heat exchange tube segments are arranged in spaced parallel relationship and fluidly couple the first and second manifold. Each of the plurality of tube segments includes a first heat exchange tube and a second heat exchange tube at least partially connected by a web extending there between. The plurality of heat exchange tube segments includes a bend defining a first section and a second section of the heat exchange tube segments. The first section is arranged at an angle to the second section. A plurality of first fins extends form the first section of the heat exchange tube segments and a plurality of second fins extends from the second section of the heat exchange tube segments.

An apparatus including: (a) a fluid material conduit in fluid communication with a source of a fluid material, wherein the fluid material comprises unexpanded, expandable polymeric microspheres; (b) a treatment zone in heat transfer communication with a source of heat and in fluid communication with the fluid material conduit, such that the fluid material is directly or indirectly contacted by heat within the treatment zone; and (c) a back pressure generator in fluid communication with the treatment zone, capable of increasing pressure in the treatment zone, which results in expansion of the expandable polymeric microspheres when the fluid material exits the treatment zone.