The disclosure provides a fluid-cooled heat sink having a heat transfer base, a shroud, and a plurality of heat transfer fins in thermal communication with the heat transfer base and the shroud, where the heat transfer base, heat transfer fins, and the shroud form a central fluid channel through which a forced or free cooling fluid may flow. The heat transfer pins are arranged around the central fluid channel with a flow space provided between adjacent pins, allowing for some portion of the central fluid channel flow to divert through the flow space. The arrangement reduces the pressure drop of the flow through the fins, optimizes average heat transfer coefficients, reduces contact and fin-pin resistances, and reduces the physical footprint of the heat sink in an operating environment.

A can type of heat exchanger may include a housing formed as a cylinder, having a mounting space at the inside, and formed with at least one inlet and at least one outlet, a heat dissipation unit mounted in the mounting space of the housing, receiving operating fluids from the inlet, and the operating fluids heat-exchanging with each other, a separating plate separating the mounting space and inside of the mounting portion, and a valve unit, selectively opening and closing the mounting space or a bypass passageway separated by the separating plate using linear displacement which is generated when expansion and contraction occur according to the temperature of the coolant flowing from the inlet, and adjusting flow of the operating fluids.

A can type of heat exchanger may include a housing formed as a cylinder, having a mounting space at the inside, and formed with at least one inlet and at least one outlet, a heat dissipation unit mounted in the mounting space of the housing, receiving operating fluids from the inlet, and the operating fluids heat-exchanging with each other, a separating plate separating the mounting space and inside of the mounting portion, and a valve unit, selectively opening and closing the mounting space or a bypass passageway separated by the separating plate using linear displacement which is generated when expansion and contraction occur according to the temperature of the coolant flowing from the inlet, and adjusting flow of the operating fluids.

A heat exchanger with a multi-zone heat transfer surface is disclosed. The heat exchanger includes a fluid flow passage extending between and interconnecting a fluid inlet and a fluid outlet. A heat transfer surface is disposed within the fluid flow passage wherein the heat transfer surface includes at least one heat transfer-reducing zone disposed in thermal contact with a portion of at least one of the walls of the fluid flow passage and at least one heat transfer-augmenting zone disposed in thermal contact with a portion of the at least one of the walls of the fluid flow passage. The configuration of the heat transfer-augmenting zones with the heat-transfer-reducing zones is such that heat transfer across the surface of the heat exchanger in contact with the heat transfer-augmenting zones is increased relative to the heat transfer across the surface of the heat exchanger in contact with the heat transfer-reducing zones.

A heat sink includes a pipe through which cooled fluid flows and a cooling block having a first face on which the pipe is placed and a second face to which a heat emitting element is attached. The cooling block has a contact region and a noncontact region at positions where the cooling block faces the pipe. In the contact region, the first face contacts the pipe. In the noncontact region, the first face faces the pipe with a gap therebetween. The contact region is included in a projection region defined by projecting a region of attachment of the heat emitting element onto the first face.

A heat dissipation device is provided herein. The heat dissipation device includes an evaporator chamber at least partially filled with a working fluid to be evaporated when being heated by a heat source; at least one condenser chamber for receiving evaporated working fluid and for condensing the evaporated working fluid, wherein the condenser chamber is interconnected with the evaporator chamber in a fluid conductive manner; and at least one air fin element interconnected between the condenser chamber and one of a further condenser chamber and a side wall of the heat dissipation device; wherein the air fin element has a triply periodic surface providing air fins.

A modular heat exchange assembly includes a cold plate defining a finned surface and a corresponding plurality of microchannels. Selected ones of the plurality of microchannel extend from a first end to an opposed second end. A fluid receiver unit defines an inlet port and a first fluid connector fluidically coupled with the inlet port. A fluid transfer unit defines an outlet port and a second fluid connector matingly engageable with and disengageable from the first fluid connector to fluidly couple the fluid receiver unit and the fluid transfer unit together. The fluid transfer unit defines a distribution manifold configured to distribute coolant among the selected microchannels at a position between the first ends and the second ends of the selected microchannels. The fluid transfer unit further defines a collection manifold configured to receive coolant from the selected microchannels. The collection manifold and the outlet port are fluidically coupled together.

Systems and methods for radiative cooling and heating are provided. For example, systems for radiative cooling can include a top layer including one or more polymers, where the top layer has high emissivity in at least a portion of the thermal spectrum and an electromagnetic extinction coefficient of approximately zero, absorptivity of approximately zero, and high transmittance in at least a portion of the solar spectrum, and further include a reflective layer including one or more metals, where the reflective layer has high reflectivity in at least a portion of the solar spectrum.

a plurality of first flow ducts and a plurality of second flow ducts adjacent to the plurality of first flow ducts for exchanging heat energy between first flows passing through the plurality of first flow ducts and second flows passing through the plurality of second flow ducts; • a parallel flow region where flow passages and directions of the first flows of the plurality of first flow ducts and adjacent flow passages and directions of the second flows of the plurality of second flow ducts are arranged in locally or tangentially parallel relationship with respect to each other at least in a portion of the parallel flow region and are fluidly separated by wall portions from each other; • wherein a cross section of the wall portions of the parallel flow region orthogonal to a local flow passage direction of the parallel flow region is a grid-like pattern.

a plurality of first flow ducts and a plurality of second flow ducts adjacent to the plurality of first flow ducts for exchanging heat energy between first flows passing through the plurality of first flow ducts and second flows passing through the plurality of second flow ducts; • a parallel flow region where flow passages and directions of the first flows of the plurality of first flow ducts and adjacent flow passages and directions of the second flows of the plurality of second flow ducts are arranged in locally or tangentially parallel relationship with respect to each other at least in a portion of the parallel flow region and are fluidly separated by wall portions from each other; • wherein a cross section of the wall portions of the parallel flow region orthogonal to a local flow passage direction of the parallel flow region is a grid-like pattern.