A constant density heat exchanger and method of operating are provided. The constant density heat exchanger includes a housing extending between a first end and a second end and defining a chamber having an inlet and an outlet. A first plate is positioned at the first end of the housing and rotatable about an axis of rotation such that the first plate selectively allows a working fluid to flow into the inlet of the chamber. A second plate is positioned at the second end of the housing and rotatable about the axis of rotation such that the second plate selectively allows the working fluid to flow out of the outlet of the chamber. The first plate and the second plate are rotatable about the axis of rotation so as to hold a volume of the working fluid at constant density as a heat source imparts thermal energy thereto.

A heat sink includes: a container in which a cavity is formed, the container having a first principal surface and a second principal surface; a working fluid encapsulated in the cavity, and a steam flow path defined in the cavity, in which the container has a flat portion and a protruding part projecting from the flat portion, an inner space of the protruding part of the container is in communication with an inner space of the flat portion to form the cavity, the protruding part of the container includes a heat receiver that is to be thermally connected with a heating element that is a cooling target, and the flat portion of the container has an intermediate portion region continuous from the protruding part and a heat radiator region more distant from the protruding part than the intermediate portion region and thermally connected with a heat radiating fin.

A reactor includes a plurality of reaction side flow passages through which a reaction fluid flows, a catalyst (catalyst structure) disposed inside the reaction side flow passages to accelerate the reaction of the reaction fluid, a plurality of heat medium side flow passages which are alternately stacked with the reaction side flow passages, and through which a heat medium flows, and a suppression flow passage which is disposed adjacent to a surface of the reaction side flow passage, the heat medium side flow passages being not stacked on the surface, and through which flows a suppression fluid suppressing the heat dissipation to the outside from the reaction fluid flowing through the reaction side flow passage, or the heat transfer from the outside to the reaction fluid.

In one general aspect, a microchannel heat exchanger is disclosed. It includes a cover, a base, and thermally conductive sheets between the cover and the base that each define a series of side-by-side lanes aligned with a flow direction. The lanes each include aligned slots that define microchannel segments and are separated by cross ribs. The sheets are stacked between the base and cover so as to cause at least some of the ribs to be offset from each other and allow the microchannel segments in the same lane in adjacent sheets to communicate with each other along the flow direction to define a plurality of microchannels in the heat exchanger.

A cross-over fluid coupling includes a first coupling end and a second coupling end. A plurality of first conduits have inner ends disposed toward the first coupling end and outer ends spaced apart from the inner end toward the second coupling end and being outboard of the inner end. A plurality of second conduits have outer ends that are disposed toward the first coupling end and positioned laterally outboard of the inner end of at least one of the first conduits, and inner ends that are spaced apart from the outer end toward the second coupling end in the axial direction and is laterally inboard of the outer end of the at least one of the first conduits.

An oil cooler comprises a cooler core having an oil fin. The oil fin includes a moveable window. The moveable window includes a base and a first flap on one side of the base. The first flap moves between a closed position and an open position. The first flap is in the open position when the cooler core is in a hot condition.

In order to correctly measure a temperature of a working fluid flowing through an outlet/inlet of a heat exchanger body, a flow adjustment ring is disposed within at least either one of a high-temperature inlet pipe and a low-temperature inlet pipe of the heat exchanger body. In this manner, a core region in which velocity and temperature of the working fluid becomes approximately constant is formed on a downstream side of the flow adjustment ring. A temperature sensor is provided in such a manner that a sensing point is arranged in this core region.

In order to correctly measure a temperature of a working fluid flowing through an outlet/inlet of a heat exchanger body, a flow adjustment ring is disposed within at least either one of a high-temperature inlet pipe and a low-temperature inlet pipe of the heat exchanger body. In this manner, a core region in which velocity and temperature of the working fluid becomes approximately constant is formed on a downstream side of the flow adjustment ring. A temperature sensor is provided in such a manner that a sensing point is arranged in this core region.

A wound strip structure for efficient heat transfer. The structure includes one or more edge-wound or face-wound strips. At least one of the strips has a plurality of turns and a plurality of apertures, and an aperture of a turn of the strip overlapping an aperture of an adjacent turn, of the strip or of another strip, to form a portion of a fluid channel. The fluid channel may be used to conduct a cooling fluid to cool the structure.

A controller configured to: acquire a temperature of a first component and a temperature of a second component; and adjust a thermal resistance of a medium between the first component and the second component based on the acquired temperature of the first component, the acquired temperature of the second component, a first temperature limit of the first component, and a second temperature limit of the second component.