A heat spreader for printed wiring boards and a method of manufacture are disclosed. The heat spreader is made from a plurality of graphene sheets that are thermo-mechanically bonded using an alloy bonding process that forms a metal alloy layer using a low temperature and pressure that does not damage the graphene sheets. The resulting heat spreader has a higher thermal conductivity than graphene sheets alone.

Titanium-based thermal ground planes are described. A thermal ground plane in accordance with the present invention comprises a titanium substrate comprising a plurality of channels, wherein the channels are oxidized to form nanostructured titania (NST) coated on the surfaces of the channels, and a vapor cavity, in communication with the plurality of titanium channels, for transporting thermal energy from one region of the thermal ground plane to another region of the thermal ground plane

An Integrated Hybrid Compact Fluid Heat Exchanger is disclosed. An example embodiment includes: a micro-channeled plate for a stream of a working fluid, the micro-channeled plate being diffusion bonded or brazed with a cover plate; and a fin assembly brazed, diffusion bonded, or welded to the micro-channeled plate. Other embodiments include a fan or blower coupled to the Integrated Hybrid Compact Fluid Heat Exchanger via air ducting or close coupling.

A method of manufacturing a heat dissipation device is disclosed. The heat dissipation device manufactured with the method includes two titanium metal sheets and a metal mesh. According to the method, the two titanium metal sheets and the metal mesh are subjected to a surface treatment, so that surface of any one of the titanium metal sheets and the metal mesh is modified to form a hydrophilic layer. With these arrangements, the titanium metal material can be freely plastically deformed and possess a capillary force, and the titanium metal sheet can therefore be used in place of the conventional copper sheet to serve as a material for making heat dissipation devices. The heat dissipation devices so produced can have largely reduced weight and largely improved heat dissipation performance.

A heat pipe assembly includes walls having porous wick linings, an insulating layer coupled with at least one of the walls, and an interior chamber sealed by the walls. The linings hold a liquid phase of a working fluid in the interior chamber. The insulating layer is directly against a conductive component of an electromagnetic power conversion device such that heat from the conductive component vaporizes the working fluid in the porous wick lining of the at least one wall and the working fluid condenses at or within the porous wick lining of at least one other wall to cool the conductive component of the electromagnetic power conversion device. The assembly can be placed in direct contact with the device while the device is operating and/or experiencing time-varying magnetic fields that cause the device to operate.

Various embodiments include heat exchangers and methods of making heat exchangers from a series of stacked plates each made of two foil sheets bonded together in bonding locations forming fluid flow passages between the foil sheets in regions where the foil sheets are not bonded. An inlet port and an outlet port located at opposite ends of the planar extent of the two foil sheets extend through the foil sheets perpendicular to the planar extent of the foil sheets. The inlet and outlet ports provide access for a first fluid to flow into or out of the internal plate passages formed between the two foil sheets. Interstitial channels are formed between the series of plates and configured to allow the flow of a second fluid between the series of plates, allowing heat to be transferred between the two fluids while isolating the two fluids from one another.

A vapor chamber with a support structure and its manufacturing method are provided. The vapor chamber with the support structure includes a first plate, a second plate spaced apart from the first plate, and multiple support elements fixed between the first and second plates. On an outer surface of any of the first plate or the second plate, laser welding is performed on positions corresponding to the support elements so as to join the support elements to the first and second plates and to form weld ports on the outer surface of any of the plates. The invention solves the problem of fixing the support structure inside the thin vapor chamber, and therefore mass production can be realized.

Several innovative technologies, including pressure-drop minimization, advanced refractory high entropy alloys, and advanced manufacturing can provide a compact heat exchanger that extends the state-of-the-art heat-exchanger operating range. The compact heat exchanger can reduce pressure drop losses by 100 to 500%, while retaining most of the heat transfer. The compact heat exchanger can be fabricated from refractory high entropy alloys that have favorable corrosion, thermal fatigue, and creep properties at high temperatures and pressures. Therefore, the compact heat exchanger using high entropy alloys can operate at >800° C. and 80 bars.

A heat exchanger includes a pipe main body forming a flow path to which a first fluid is supplied, a pair of partition plates defining a closed space, a plurality of heat transfer tubes, a supply portion configured to supply a second fluid into the closed space, a discharge portion configured to discharge the second fluid in the closed space, and a flow path forming portion forming a plurality of small flow path portions between the heat transfer tubes adjacent to each other. The second fluid flows between the plurality of heat transfer tubes in the closed space in a direction opposite to the flow direction of the first fluid. The plurality of small flow path portions are disposed at positions different from each other when viewed from a position where the discharge portion is disposed in an extension direction.

There is disclosed a heat exchanger comprising at least one set of channels having a proximal end and a distal end, the set of channels comprising: a first channel defined by a first skin and a wall; and a second channel defined by a second skin and the wall, wherein the wall located between the first channel and the second channel comprises a first at least one aperture to allow fluid to pass through the wall from the first channel to the second channel.