A heat exchanger includes: a fin extending in a widthwise direction along an air flow direction and extending in a longitudinal direction crossing the air flow direction; and a heat transfer tube passing through the fin. The fin includes a planar portion, and a plurality of first protruding portions and a plurality of second protruding portions that protrude from the planar portion. The plurality of first protruding portions include a first projection curved downward in the longitudinal direction, and a second projection curved upward in the longitudinal direction. Each of the plurality of second protruding portions surrounds a corresponding one of the plurality of through holes. A vertex of the first projection and a vertex of the second projection are located at the same position in the widthwise direction.

In a corrugated fin type heat exchanger a flat tube can be replaced, to improve heat exchange performance thereof. A characteristic part of the heat exchanger lies in a projection having been formed on the ascending surface and the descending surface of the corrugated fin of respective tube elements.

A method for forming a heat exchanger plate includes: securing a wave form metallic sheet to a heat exchanger plate substrate, the substrate comprising a first face and a second face opposite the first face, the securing of the wave form metallic sheet being to the first face; and removing peaks of the sheet.

A heatsink comprising a heat exchange device having a plurality of heat exchange elements each having a surface boundary with respect to a heat transfer fluid, having successive elements or regions having varying size scales. According to one embodiment, an accumulation of dust or particles on a surface of the heatsink is reduced by a removal mechanism. The mechanism can be thermal pyrolysis, vibration, blowing, etc. In the case of vibration, adverse effects on the system to be cooled may be minimized by an active or passive vibration suppression system.

A heat dissipation apparatus, a remote radio unit, a baseband processing unit and a base station are disclosed. According to an embodiment, the heat dissipation apparatus comprises a base and a plurality of first heat sink fins arranged in parallel on the base. On a top of each first heat sink fin of the plurality of first heat sink fins, a first heat dissipation component and a second heat dissipation component are sequentially arranged along the parallel direction of the plurality of first heat sink fins. The first heat dissipation component comprises a bottom plate and a plurality of second heat sink fins which are arranged at intervals along the parallel direction on a top face of the bottom plate. Each second heat sink fin has a shape of a comb having three or more comb teeth.

Water heaters, baffles for water heaters, and methods for manufacturing such baffles are disclosed, One baffle includes a core, an outer wall, and a plurality of fins. The outer wall surrounds the core and defines at least one flow path between the outer wall and the core. The plurality of fins extend from the outer wall toward the core. Each of the plurality of fins has a serpentine shape. One method for manufacturing a baffle includes extruding at least one portion of the baffle in one piece, the at least one portion of the baffle having an at least partially cylindrical outer wall u and a plurality of fins extending inward from the outer wall, each of the plurality of fins having a serpentine shape. One water heating system includes a burner, a vent, at least one flue tube, and at least one baffle as described above.

A heat sink includes a heat conduction portion and a heat dissipation portion. The heat conduction portion is a flat plate with two main surfaces parallel with each other and a plurality of side surfaces. One of the two main surfaces is a contacting surface contacting a heat source. The heat dissipation portion is extended outward from at least one of the plurality of side surfaces of the heat conduction portion. The heat dissipation portion includes a plurality of first branches and a plurality of second branches. Each of the first branches is a flat plate and has two opposite main surfaces and four side surfaces. The two opposite main surfaces of each of the first branches are parallel to the two main surfaces of the heat conduction portion. The second branches are extended from the first branches and parallel to the heat conduction portion.

A cast plate heat exchanger includes an inner surface of a passage with a first group of augmentation features with a first density across the inner surface. An outer surface includes a second inlet end and a second group of augmentation features arranged with a second density across the outer surface. The first density and second density of augmentation features are located in a targeted manner to reduce thermal stresses.

A water-cooling device with a composite heat-dissipating structure is provided, which includes a casing, a main heat-dissipating structure and a layered heat-dissipating structure. The casing is used for accommodating a working fluid, and the casing includes a heat-dissipating substrate. The main heat-dissipating structure includes a plurality of heat-dissipating fins arranged vertically and in parallel to each other that are connected to the heat-dissipating substrate. The layered heat-dissipating structure includes a plurality of horizontal heat-dissipating bodies arranged horizontally and in parallel to each other that are connected to the plurality of heat-dissipating fins arranged vertically and in parallel to each other, and a distance between the plurality of horizontal heat-dissipating bodies arranged horizontally and in parallel to each other is greater than or equal to a distance between the plurality of heat-dissipating fins arranged vertically and in parallel to each other.

A heat exchanger system is provided and includes a heat sink, fins arrayed on a central region of the heat sink to form channels between adjacent fins and an integrated blower. Each of the fins extends radially outwardly from the central region and has a height that increases with increasing distance from the central region. The integrated blower is disposed at the central region to generate flows of coolant directed into and through the channels.