A double tube and the like includes: a cylindrical outer tube; a cylindrical inner tube including a helical protrusion in an outer circumferential surface, the inner tube being provided inside the outer tube; and a helical flow passage forming member that forms a helical flow passage inside the inner tube, the helical flow passage forming member being provided inside the inner tube.

Thermal management devices, systems, and methods of fabrication thereof are generally directed to accommodating variability in height, shape, or other geometric features of one or more heat-dissipating components on a substrate while maintaining efficient transfer of heat away from the one or more heat-dissipating components. For example, a thermal management device may include a housing, a diaphragm, and a wick, the wick disposed along a chamber defined by the housing and the diaphragm such that a fluid within the chamber may evaporate and condense along the chamber to transfer heat away from one or more heat-dissipating components (e.g., electronic components or photonics). The diaphragm may be resiliently flexible relative to the housing to bias a contact surface of the diaphragm against one or more heat-dissipating components while maintaining efficient transfer of heat through the chamber and away from the one or more heat-dissipating components.

A reticular panel (1) for a cooling tower defining a longitudinal plane (1a) and a sagittal plane (1b) normal to the longitudinal plane (1a), crossing in a main axis (1c) and developed on the longitudinal plane (1a) in a corrugated mode, making fins (2) recurrent along the main axis (1c), arranged in two rows (1) symmetrical to said sagittal plane (1b), extending along corresponding secondary axes (2a) transversal to the main axis (1c) and mutually parallel, each row including at least a top crest (20) more spaced from the longitudinal plane (1a) in respect of the rest of the fin (2), wherein each fin (2) includes at least a blade (23) extending parallel to the secondary axis (2a) configured to increase the surface of thermal exchange of the panel (1).

An aluminum alloy material contains Si: 1.0 mass % to 5.0 mass % and Fe: 0.01 mass % 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 to 710.sup.5 pcs/mm.sup.2 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.

A heat exchanger includes a housing, and a combustion chamber, a heat exchange chamber, and a condensation chamber provided inside the housing and sequentially arranged along a flue gas flow direction in the housing. The heat exchanger further includes combustion-chamber heat-exchange tubes provided in the combustion chamber, heat-exchange-chamber heat-exchange tubes provided in the heat exchange chamber and in communication with the combustion-chamber heat-exchange tubes, and condensation-chamber heat-exchange tubes provided in the condensation chamber and in communication with the heat-exchange-chamber heat-exchange tubes.

An exothermal vaporizer is provided. The exothermal vaporizer has a body including an air and vapor mix port, a fluid inlet port in communication with a reservoir, an air inlet, and a wicking material. A mouthpiece is coupled to the body and a temperature indicating cap is removable from the body. A counter flow design exothermal vaporizer, a modular exothermal vaporizer, and a vaporizer which is adjustable to modulate and/or regulate the flow ratio of dilution air and produced vapor are also disclosed.

An aluminum alloy heat exchanger includes a core material formed of an aluminum alloy comprising Mn of 0.60 to 2.00 mass % and Cu of 1.00 mass % or less, with the balance being Al and inevitable impurities, and a sacrificial anode material formed of an aluminum alloy comprising Zn of 2.50 to 10.00 mass %, with the balance being Al and inevitable impurities. Pitting potential of a sacrificial anode material surface of a tube of the aluminum alloy heat exchanger in a 5% NaCl solution is 800 (mV vs Ag/AgCl) or less, and pitting potential of an aluminum fin of the aluminum alloy heat exchanger in a 5% NaCl solution is less than the pitting potential of the sacrificial anode material surface of the tube of the aluminum alloy heat exchanger in a 5% NaCl solution.

A heat exchanger includes a plurality of refrigerant tubes through which refrigerant flows and a fin which is arranged between adjacent refrigerant tubes, conducts heat, and extends in a first direction. The fin includes: a flat portion defining a surface parallel to the first direction; a first protruded portion having a step from the flat portion; and a second protruded portion having a step from the flat portion, where the first protruded portion and the second protruded portion are arranged symmetrically with respect to a center of the fin.

A heatsink includes: a base plate thermally connected to a heat-generating unit; a plurality of heat radiation fins erected on a surface of the base plate, and arranged with gaps in a first direction along the surface; and a partition member provided to intersect the plurality of heat radiation fins, and partitioning the plurality of heat radiation fins in a second direction along the surface and intersecting the first direction. The partition member partitions the plurality of heat radiation fins such that more air passes through in the second direction between the plurality of heat radiation fins on a base plate side than on a side opposite to the base plate side.

A heat exchanger includes a first plate, a second plate and an elastic member. The second plate is disposed on the first plate. A chamber is defined between the first plate and the second plate. The elastic member is disposed between the first plate and the second plate. The second plate has a surrounding portion and a heated surface in the surrounding portion as one piece. A flexible portion is integrally connected between the heated surface and the surrounding portion. The flexible portion surrounds a periphery of the heated surface to hang the heated surface in the surrounding portion. The elastic member is disposed between the heated surface and the first plate as elastic support. The flexible portion can provide the heated surface ability of partial deformation to improve the contact effect between the heated surface and a surface of a heat source to maintain great heat exchange ability.