A heat dissipation structure adapted to dissipate heat from a heat generating component includes a central housing and a first wing housing. The central housing includes a top portion and a bottom portion opposite to each other, an internal space located between the top portion and the bottom portion, and a first opening communicating with the internal space. The top portion includes multiple through holes. The bottom portion is connected to the heat generating component. The first wing housing is connected to the central housing and includes a first entrance distant from the central housing and communicating with the first opening. The first entrance has a dimension larger than the first opening. An air flow sequentially flows through the first entrance, the first opening, and the internal space and flows out from the through holes.

Aluminum alloy material containing Si: 1.0 to 5.0 mass % and Fe: 0.01 to 2.0 mass % with balance being Al and inevitable impurities, wherein 250 pcs/mm.sup.2 or more to 710.sup.5 pcs/mm.sup.2 or less of Si-based intermetallic compound particles having equivalent circle diameters of 0.5 to 5 m are present in a cross-section of the aluminum alloy material, while 100 pcs/mm.sup.2 or more to 710.sup.5 pcs/mm.sup.2 or less of Al-based intermetallic compound particles having equivalent circle diameters of 0.5 to 5 m are present in a cross-section of the aluminum alloy material. An aluminum alloy structure is manufactured by bonding two or more members in vacuum or a non-oxidizing atmosphere at temperature at which a ratio of a mass of a liquid phase generated in the aluminum alloy material to a total mass of the aluminum alloy material is 5% or more and 35% or less.

The invention relates to a heat exchanger of an air circulation channel of a turbomachine, the heat exchanger being configured so as to have fluid to be cooled passing through it and including a plurality of fins protruding from a support surface, the heat exchanger being characterized in that each fin includes a base and a preferably continuous leading face which extends axially from the base in the air circulation direction while tapering from upstream to downstream along an axis parallel with the support surface.

In one aspect, a hybrid heat exchanger that includes a metallic serpentine tube having an inlet end portion to receive a process fluid, an outlet end portion, and a series of runs and return bends directing the process fluid from the inlet end portion to the outlet end portion of the metallic serpentine tube. The hybrid heat exchanger further includes a thermally conductive polymer body thermally integrated with the serpentine tube. The thermally conductive polymer body has an outer surface to be contacted by a fluid, such as air and/or water. The thermally conductive polymer body is configured to transfer heat between the metallic serpentine tube and the fluid contacting the outer surface of the thermally conductive polymer body. The outer surface of the thermally conductive polymer body includes surface enhancement features that affect flow of the fluid across the outer surface of the thermally conductive polymer body.

A heat exchanger assembly for a motor vehicle includes an inflow side, an outflow side, and at least one helically extending heat exchanger tube through which a heat exchanger fluid flows. A medium flows along a throughflow direction from the inflow side to the outflow side. A helix axis of a helix formed by the heat exchanger tube extends transversely with respect to the throughflow direction of the heat exchanger assembly.

A heat exchanger includes an inner fin arranged in a refrigerant passage. The inner fin has side wall portions formed so as to extend in a predetermined direction and arranged parallel to each other. A gap formed between the side wall portions facing each other is a passage portion through which refrigerant flows. Each of the side wall portions has a plurality of openings arranged in the predetermined direction. An inclined surface inclined with respect to the predetermined direction is formed in a part of the side wall portion located between the openings adjacent to each other.

A method includes compressing an air flow to a first pressure, transferring heat from the air flow to a liquefaction fluid via an intercooler heat exchanger, compressing the air flow to a second pressure greater than the first pressure, combusting the air flow and a fuel to generate a combustion product flow, and driving a turbine with the combustion product flow. The turbine is configured to drive machinery of a liquefaction system. The liquefaction fluid includes at least one of a pre-cooling fluid, a refrigerant, and a liquefied product of the liquefaction system.

A condensation enhancement heat transfer pipe that includes an optical pipe section, a fin section, and a transition section connecting the optical pipe section and the fin section. The outer surface of the fin section includes a plurality of individual fins, each having an acute shape of zigzag and forms an angle relative to the axial direction, an axial fin channel forms between the two adjacent ones of said individual fins along the axial direction, a peripheral fin channel forms between the two adjacent ones of said individual fins along the peripheral direction, an end, which is distributed along said axial direction, of each of said individual fins includes platforms, the fin side walls are connected with the platform by an arc, and the platforms are parallel to each other along the peripheral direction.

Aluminum alloy material containing Si: 1.0 to 5.0 mass % and Fe: 0.01 to 2.0 mass % with balance being Al and inevitable impurities, wherein 250 pcs/mm.sup.2 or more to 710.sup.5 pcs/mm.sup.2 or less of Si-based intermetallic compound particles having equivalent circle diameters of 0.5 to 5 m are present in a cross-section of the aluminum alloy material, while 100 pcs/mm.sup.2 or more to 710.sup.5 pcs/mm.sup.2 or less of Al-based intermetallic compound particles having equivalent circle diameters of 0.5 to 5 m are present in a cross-section of the aluminum alloy material. An aluminum alloy structure is manufactured by bonding two or more members in vacuum or a non-oxidizing atmosphere at temperature at which a ratio of a mass of a liquid phase generated in the aluminum alloy material to a total mass of the aluminum alloy material is 5% or more and 35% or less.

Large scale field erected air cooled industrial steam condenser having heat exchanger panels with primary and secondary condenser sections, in which the secondary condenser section comprises 10% or less of the total heat exchanger, and in which the tubes of the primary condenser sections have narrowed outlet orifices having an area that is 50% or less than the cross-sectional area of a corresponding tube. The invention permits the reduction of secondary condenser tubes while reducing the outlet header pressure sufficiently to minimize backflow, sweep non-condensables and prevent the formation of dead zones.