Abstract: 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.

Abstract: An additive manufactured object according to at least one embodiment of the present disclosure includes a first base portion made of a metal, and a plurality of wall portions each having a thickness thinner than the first base portion and provided upright on the first base portion so as to be aligned in a wall thickness direction. A first end portion of each of the wall portions is connected to the first base portion via a first connection portion having a width greater than the thickness of each of the wall portions in the wall thickness direction.

Abstract: A heat exchanger according to one embodiment includes: a heat exchange core; a shell provided to surround the heat exchange core; and a first partition wall that is provided in a space surrounded by an outer surface of the heat exchange core and an inner surface of the shell, and partitions the space into a first header space communicating with the heat exchange core and a second header space communicating with the heat exchange core. The first header space and the second header space are adjacent to each other, separated by the first partition wall.

Abstract: A heat exchanger core according to at least one embodiment is provided with: a core body having a plurality of cavity portions forming a plurality of channels inside the core body; and a header including a header passage communicating with the plurality of channels on at least one end side of the core body. The header passage is at least partially located in a region displaced outward from an arrangement area of the plurality of channels in plan view as viewed from a first extension direction of the plurality of channels. The core body has a body side surface extending along the first extension direction at a position closer to the arrangement area than a portion of the header passage that is farthest outward from the arrangement area in the plan view.

Abstract: A heat exchanger includes: a pipe forming a flow path through which a first fluid is fed; a pair of partition plates provided at an interval in an extending direction of the flow path to block the flow path, to partition a closed space at a portion of the flow path; a plurality of heat transfer tubes having a tubular shape with both ends being open, extending so as to penetrate the pair of partition plates, and arranged side by side with intervals therebetween; a feeding part configured to feed a second fluid from an outside of the pipe to the closed space; and a discharging part configured to discharge the second fluid in the closed space to the outside of the pipe.

Abstract: A heat exchanger core includes a core formed such that a pair of adjacent passages are folded on top of one another while being adjacent. At least one passage of the pair of adjacent passages has a pair of adjacent passage portions between which the other passage is not interposed in a direction in which the passages lie on top of one another. The core has a heat insulation layer between the pair of passage portions.

Abstract: In a header of a heat exchanger core, a header passage includes: at least one radial passage extending along a radial direction, and a plurality of circumferential passages branched from each radial passage and communicating with one or more of the axial passages, respectively. The flow passage area of each radial passage is smaller in a second position than in a first position, where the second position is inward of the first position in the radial direction.

Abstract: A heat exchanger for heat exchange between a first fluid and a second fluid is provided with: a body part which is an additive manufactured body and includes a first passage through which the first fluid flows and a second passage through which the second fluid flows; and a covering part attached to the body part. The body part has a first opening portion of the first passage and a second opening portion of the second passage, and the covering part is attached to the body part so as to cover exposure of the first opening portion and the second opening portion.

Abstract: A heat exchanger passage switching device according to an embodiment includes: a communication tube having an internal passage communicating with a heat exchange passage for performing heat exchange inside a heat exchanger, and one or more communication holes communicating with the internal passage; and at least one chamber having an insertion hole into which the communication tube is inserted to slidably support the communication tube inserted in the insertion hole. The communication tube is capable of switching a communication state between the one or more communication holes and the at least one chamber by a relative position of the communication tube to the at least one chamber in an axial direction.

Abstract: A heat exchanger core includes: a first passage; and a second passage extending along the first passage. At least one of the first passage or the second passage includes a plurality of narrowed portions in which an area of a passage cross section orthogonal to a passage extension direction is minimum, and a plurality of enlarged portions in which the area is maximum. The plurality of narrowed portions and the plurality of enlarged portions are alternately disposed in the passage extension direction.

Abstract: A heat exchanger core includes: a first passage row which is formed by a plurality of first passages; a plurality of first dividing walls separating the plurality of first passages from each other; a second passage row which is disposed adjacent to the first passage row and is formed by a plurality of second passages; a plurality of second dividing walls separating the plurality of second passages from each other; and a partition wall located between the first passage row and the second passage row, and separating the plurality of first passages and the plurality of second passages. (a) The partition wall has a greater section modulus in an orthogonal direction than either the first dividing wall or the second partition, or (b) a constituent material of the partition wall has a greater breaking strength than a constituent material of either the first dividing wall or the second dividing wall.

Abstract: A cleaning method for a heat exchanger is a cleaning method for a heat exchanger which includes a header passage and a plurality of internal passages connected to the header passage, that includes: a step of supplying a cleaning fluid, via the header passage, to some of the plurality of internal passages connected to the header passage, selectively.

Abstract: An outer surface of a part of an airframe includes a mixed region in which a first color similar to a color applied to an adjacent region and a second color having a lower absorption rate of sunlight than the first color are mixed in a predetermined color distribution pattern. A reflective material that contributes to an increase in a reflection rate of sunlight is added to a part to which at least the first color is applied in the mixed region.

Abstract: A heat exchanger including: a heat exchanger main body forming a flow path through which a fluid circulates; heat transfer tubes arranged side by side so as to extend in an extending direction of the flow path; and a baffle plate group having a plurality of baffle plates provided with gaps therebetween in the extending direction of the flow path while supporting the heat transfer tubes. The baffle plates are provided so as to each occupy only a portion of the flow path cross section when viewed from the extending direction of the flow path, and the baffle plates of the baffle plate group are provided such that at least a portion of mutually occupied areas do not overlap, and that the entire area of the flow path cross section is occupied by combining the mutually occupied areas, as seen from the extending direction of the flow path.

Abstract: A heat exchanger core according to an embodiment includes: a first header space; a plurality of first layered header passages; a plurality of first communication port rows; and a plurality of first passages. The plurality of first layered header passages are stacked in a perpendicular direction to a reference plane so as to each extend along the reference plane. Each first layered header passage has an open end at a first edge adjacent to the first header space and communicates with the first header space through the open end. The plurality of first communication port rows are arranged in the perpendicular direction so as to correspond to the plurality of first layered header passages, respectively. Each first communication port row is formed by a plurality of first communication ports arranged along the reference plane. The plurality of first passages communicate with any of the first layered header passages through the plurality of first communication ports.

Abstract: An additive manufactured object according to at least one embodiment of the present disclosure includes a first base portion made of a metal, and a plurality of wall portions each having a thickness thinner than the first base portion and provided upright on the first base portion so as to be aligned in a wall thickness direction. A first end portion of each of the wall portions is connected to the first base portion via a first connection portion having a width greater than the thickness of each of the wall portions in the wall thickness direction.

Abstract: A heat pipe includes an external cylinder extending in an axial direction, an internal cylinder provided inside the external cylinder so as to extend in the axial direction, and a wick provided between and integrally with the external cylinder and the internal cylinder. The wick includes a plurality of micro through portions extending linearly in the axial direction. According to this configuration, a working fluid moves smoothly in the axial direction without being blocked, and thus it is possible to provide a heat pipe having a further improved heat exchange performance.

Abstract: A heat exchanger according to one embodiment includes: a heat exchange core; a shell provided to surround the heat exchange core; and a first partition wall that is provided in a space surrounded by an outer surface of the heat exchange core and an inner surface of the shell, and partitions the space into a first header space communicating with the heat exchange core and a second header space communicating with the heat exchange core. The first header space and the second header space are adjacent to each other, separated by the first partition wall.

Abstract: A heat exchanger according to one embodiment includes: a cyclone flow path into which a first fluid is introduced along a tangential direction, the first fluid flowing downward in the cyclone flow path; a lower case located below the cyclone flow path and forming a lower space having a flow path area larger than that of the cyclone flow path; a first outlet flow path located on an outer peripheral side of the cyclone flow path, the first outlet flow path communicating with the lower space; a second inlet flow path into which a second fluid is introduced, the second inlet flow path being located on the outer peripheral side of the cyclone flow path; a second outlet flow path located on an inner peripheral side of the cyclone flow path; and a second intermediate flow path connecting the second inlet flow path and the second outlet flow path.

Abstract: A heat exchange core according to one embodiment includes: a header flow path that extends in a first direction; and a plurality of branching flow paths that are connected to the header flow path and extend in a second direction intersecting with the first direction. A first angle formed by the header flow path with respect to a virtual connection plane between the header flow path and the plurality of branching flow paths is less than a second angle formed by the branching flow paths with respect to the connection plane.