A flat tube for a header-plateless heat exchanger has an inner plate and an outer plate that are each press-molded from a metal plate and are curved/folded into a groove shape comprising a groove bottom section and two side wall sections. Both plates are such that the outer plate is fitted to the outside of the inner plate in a manner such that the groove bottom sections oppose each other, and an expanded opening in the thickness direction is formed at both ends of the plates.

A system may include a thermal source, a thermal sink and heat-rejecting media comprising a thermal cable, the thermal cable comprising a main length comprising a flexible graphite layer rolled into a cylindrical shape covered on the outside thereof by a thermally-insulating layer of the same cylindrical shape, a first termination at which the flexible graphite layer thermally couples to the thermal source, and a second termination at which the flexible graphite layer thermally couples to the thermal sink.

In one aspect of the present disclosure, an indirect heat exchanger pressure vessel is provided that includes an inlet header to receive a pressurized working fluid, such as water, glycol, ammonia, and/or CO.sub.2. The indirect heat exchanger pressure vessel includes an outlet header to collect the pressurized working fluid and a serpentine circuit tube connecting the inlet and outlet headers. The serpentine circuit tube permits the pressurized working fluid to flow from the inlet header to the outlet header. The serpentine circuit tube includes runs and a return bend connecting the runs. The return bend has a controlled wrinkled portion comprising alternating ridges and grooves. The alternating ridges and grooves strengthen the return bend and permit the indirect heat exchanger pressure vessel to facilitate working fluid heat transfer at a high internal operating pressure.

A hollow tube with a varying cross-sectional area is disclosed. A hollow tube with a varying cross-sectional area, the hollow tube extending from one end to other end to form a longitudinal direction, the hollow tube comprises a plurality of hollow tube units that are formed to extend along the longitudinal direction and are coupled to each other to constitute the hollow tube, a hollow positioned inside the hollow tube, wherein a cross-sectional area of the hollow varies along the longitudinal direction, and a filling module installed in the hollow.

A heat pipe including a pipe body. The pipe body has an evaporation portion and a condensation portion. The condensation portion is connected to the evaporation portion. The condensation portion includes a condensation end. The evaporation portion includes an evaporation end. The evaporation end and/or the condensation end are/is in a rectangular shape.

The present disclosure provides a technique related to a cooler including a main channel in which an object to be cooled is attached to an upper surface thereof, and a structure which prevents air bubbles from entering the main channel. A cooler for cooling an object may include: a main channel in which coolant flows, wherein the object is attached to an upper surface of the main channel; and a sub channel bypassing the main channel, wherein a ceiling of the sub channel is higher than a ceiling of the main channel at a branch point between the main channel and the sub channel. Air bubbles trapped in the coolant flow into the sub channel having a higher ceiling height, thus they do not enter the main channel.

A flow manifold for a heat exchanger core includes a number of fractal flow splitters arranged in a grid pattern of layers each fluidly connected to a corresponding first circuit layer, a flow plenum having a number of flow channels that are fluidly connected to an associated fractal flow splitter, one or more flow dividing vanes located in each flow channel thereby dividing the associated flow channel into two or more sub-channels, and an outer manifold surrounding the fractal flow splitters and configured to direct a first circuit flow into or out of the heat exchanger core. Each fractal flow splitter has an open end and a plenum end, and provides a transition from the open end to the flow plenum.

Disclosed herein is a double tube for heat exchange. The double tube for heat exchange includes: a spiral pipe having ridges and valleys alternately formed on a circumferential surface thereof along a spiral track thereof and guiding a first fluid to flow therethrough; an outer pipe receiving the spiral pipe axially inserted thereinto and guiding a second fluid to flow along the circumferential surface of the spiral pipe in an axial direction such that the second fluid exchanges heat with the first fluid; and a resistance member protruding from the spiral pipe or the valleys to increase residence time of the second fluid in the valleys on the circumferential surface of the spiral pipe and to support the ridges adjacent thereto. Unlike typical double tubes, the double tube for heat exchange can improve heat exchange efficiency between a second fluid flowing inside an outer pipe and a fluid flowing inside a spiral pipe axially inserted into the outer pipe to increase residence time of the second fluid inside the outer pipe by virtue of a spiral shape of the spiral pipe; can improve flow directionality of the second fluid through formation of the grooves in valleys of the spiral pipe along a spiral track of the valleys; can reduce flow-induced noise through expansion of a space defined between an end joint of the outer pipe and the inner pipe to reduce the pressure of the second fluid; and further improve heat exchange efficiency through resistance members protruding from the valleys to increase residence time of the second fluid.

A tube for a thermal transfer device can include a wall having a length and having an inner surface and an outer surface, wherein the inner surface forms a cavity. The tube can also include at least one first dimple pressed into the wall toward the cavity at a first location along the length of the wall, where the inner surface of the wall at the at least one first dimple is separated from itself by a first distance. The tube can further include at least one second dimple pressed into the wall toward the cavity at a second location along the length of the wall, where the inner surface of the wall at the at least one second dimple is separated from itself by a second distance. The cavity can be configured to receive a fluid that flows continuously along a length of the at least one wall.

A system may include a thermal source, a thermal sink and heat-rejecting media comprising a thermal cable, the thermal cable comprising a main length comprising a flexible graphite layer rolled into a cylindrical shape covered on the outside thereof by a thermally-insulating layer of the same cylindrical shape, a first termination at which the flexible graphite layer thermally couples to the thermal source, and a second termination at which the flexible graphite layer thermally couples to the thermal sink.