A heat exchanger (1) includes a heat exchanger (1) including a separate plate (10) and a first flow path (11) which is divided by a plurality of fin portions (13a) and through which air flows, a fan (2), and a control unit (3) that perform s control for switching between a first mode where heat exchange is performed by forcing air to flow in and a second mode where heat exchange is performed by natural convection, the plurality of fin portions (13a) are disposed in parallel at predetermined intervals (p1), and are formed to have an undulating shape from one end (11b) toward the other end (11c) of the first flow path (11) in a width direction of the first flow path (11), and the first flow path (11) is configured to be used in both the first mode and the second mode.

A liquid cooling heat dissipation substrate with partial compression reinforcement is provided. The liquid cooling heat dissipation substrate with partial compression reinforcement includes a heat dissipation base and a compression reinforcement structure. The heat dissipation base integrally has an upper surface and a lower surface opposite to each other, and the compression reinforcement structure is partially formed on at least one of the upper surface and the lower surface. A ratio of a sum of an area of an orthogonal projection of the compression reinforcement structure on the upper surface and an area of an orthogonal projection of the compression reinforcement structure on the lower surface to a sum of an area of the upper surface and an area of the lower surface is from 10% to 60%.

A heat sink 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 a fractal variation therebetween, wherein the heat transfer fluid is induced to flow with respect to the plurality of fractally varying heat exchange elements such that flow-induced vortices are generated at non-corresponding locations of the plurality of fractally varying heat exchange elements, resulting in a reduced resonance as compared to a corresponding heat exchange device having a plurality of heat exchange elements that produce flow-induced vortices at corresponding locations on the plurality of heat exchange elements.

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.

A heat exchanger has a plurality of outer walls and at least one inner wall. A first fluid port communicates a first fluid into a chamber on one side of the at least one inner wall and a second port communicates a second fluid into a second chamber on an opposed side of the at least one inner wall. A plurality of pins extends from the inner wall in at least one of the chambers. The plurality of pins has a generally frusto-conical outer surface. A method is also disclosed and claimed.

A heat dissipation device includes a base, fins and strip-shaped plates. The fins protrude side by side from the base, and the fins respectively include first end edges and second end edges opposite to each other. The first end edges are connected to the base. The strip-shaped plates are parallel to the base and connected to at least a part of the second end edges of the fins, and strip-shaped openings are formed between the strip-shaped plates. The base, the fins and the strip-shaped plates collectively surround chambers in a non-closed manner, and each of the strip-shaped openings is connected to the corresponding chamber. A distance between two adjacent fins of the fins is S, a width of any one of the strip-shaped openings is d, and d/S is between 0.01 and 0.4.

The present disclosure provides for thick fins on the surface of coils or tubes in a steam cracking furnace. The fins have a thickness at their base from ¼ to ¾ of the radius of the furnace tube. The fins have grooves or protuberances on not less than about 10% of a major surface. The fins help increase the radiant heat taken up by the tube from the walls and combustion gases in the furnace.

At least one heat pipe is fixed to each of fin plates, a rectangular fin plate assembly is constituted of the fin plate, the fin plate and the fin plate of the plurality of respective radiation fin parts as the plurality of radiation fin parts are seen from the direction in which the heat pipes extend, the plurality of heat pipes include a first heat pipe group and a second heat pipe group, the first heat pipe group is positioned at the center in the longitudinal direction of the fin plate assembly, the second heat pipe group is positioned on both sides of the first heat pipe group in the longitudinal direction of the fin plate assembly, and the fin plate thermally connected to the first heat pipe group includes expanding parts.

Provided are rectangular plate-like fins 2 layered at intervals; and flat tubes 3 which are perpendicularly extended through the layered plate-like fins 2 and are provided on multiple levels along a longitudinal direction of the plate-like fins 2. The plate-like fins 2 are provided with at least one heat transfer promoting section 6 that is positioned in a region between adjacently-positioned flat tubes 3 and in which ridge sections 4 and valley sections 5 having ridgelines extending in the longitudinal direction of the plate-like fins 2 are arranged to alternate. En the heat transfer promoting section 6, at least one slit 7 allowing communication between a front and a back of the plate-like fin 2 is formed on a downwind side of the ridge sections 4.

A heat sink comprising a heat exchange device having a large-scale morphology over a scale range and a small-scale texture over a scale range, wherein at least one of the large-scale morphology and the small scale texture has a fractal-like self-similarity over a scale range. The large-scale morphology and small-scale texture may be defined and implemented independently, or be provided with a transitional range. The large-scale morphology may be algorithmically optimized according to a set of geometrically constraints. The small-scale texture may be optimized according to aerodynamic parameters and constraints. The heat sink may be dynamically varying, and/or operated in conjunction with a dynamically varying heat transfer medium supply.