One object of the present invention is to provide a multistage bath condenser-reboiler capable of suppressing a decrease in condensation efficiency and making it compact. The present invention provides a multistage bath condenser-reboiler, including: a heat exchange core including a heat exchange section formed by adjacently stacking an evaporation passage through which liquid to be evaporated flows, and which is partitioned into a plurality of stages, and a condensation passage through which gas is condensed by heat exchange with the liquid; a liquid reservoir which is configured to store liquid which is supplied into the evaporation passage or flowed out from the evaporation passage; and a liquid communication passage which is configured to flow the liquid in the liquid reservoir from an upper liquid reservoir into a lower liquid reservoir; and the liquid reservoir is provided for each evaporation passage partitioned into the plurality of stages on at least one side surface in a width direction of the heat exchanger core, which is orthogonal to a stacking direction of the condensation passage and the evaporation passage, wherein the condensation passage is divided at least two stages, and wherein the multistage bath condenser-reboiler further comprises: a gas header which is provided at the top of each stage of the condensation passage to supply the gas into the condensation passage of each stage; condensation inlet flow channels which introduce the gas supplied in the gas header into the condensation passage; a liquid header which is provided at the bottom of each stage of the condensation passage, and collects liquid generated by condensation of the gas in the condensation passage, and condensation outlet flow channels which flow out the liquid generated by condensation into the liquid header.

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.

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.

In a first and second corrugated portions of a first and second heat transfer plates, first front-side convex portions that are convex toward one side in a first direction and first back-side convex portions that are convex toward the opposite side in the first direction are alternately formed along a second direction. In at least one end of both ends of each of the first front-side convex portions in the second direction, a first front-side protruding portion protruding toward another first front-side convex portion is provided. The first front-side protruding portion is contactable with the second heat transfer plate. In at least one end of both ends of each of the second front-side convex portions in the second direction, a second front-side protruding portion protruding toward another second front-side convex portion is provided. The second front-side protruding portion is contactable with the first heat transfer plate.

A heat exchange structure includes: two flow channels stacked in a stacking direction (Y direction) and thermally coupled to each other; and a fin structure detachably installed in at least one flow channel of the two flow channels. The fin structure includes fins arranged in a longitudinal direction (Z direction) of the at least one flow channel in which the fin structure is installed, the fins configured to form openings alternately arranged along the at least one flow channel on one side and the other side of the at least one flow channel in a width direction (X direction).

A heat exchanger plate (1) is described comprising an edge (2), a groove (3) running along the edge (2), and a corrugated area (4) having tops (5) and valleys (6) between the groove (3) and the edge (2), wherein the tops (5) run substantially perpendicular to the edge (2) and the groove (3) comprises an external wall (7) adjacent to the corrugated area (4) and an internal wall (8). Using such a heat exchanger plate (1) it should be possible to produce a reliable plate-type heat exchanger of simple construction. To this end the external wall (7) is in form of a wavy shape.

The present invention relates to a pair of heat exchanger (AB) plates (A, B), comprising a first heat exchanger plate (A) and a second heat exchanger plate (B), which are disposed facing one another and are spaced apart from one another so as to define an internal volume that is able to form a channel for the flow of a first fluid (F.sub.1), and each comprising a central panel (A.sub.0, B.sub.0. Said central panels are quadrilateral or quadrilateral with optionally truncated, cut-off or rounded edges, and are flat and mutually parallel. Two opposite sides of the central panel (A.sub.0) of the first plate (A) are inclined with respect to said central panel (A.sub.0) in the direction of the second plate (B) and form first joining panels (P.sub.1, P.sub.2) that come into contact with the two corresponding flat opposite edges of the central panel (B.sub.0) of the second plate (B).

A heat exchanger with at least one plate includes main dimples between which secondary dimples are formed which are flatter and/or smaller with respect to their dimensions as seen in a plan view. A depth of the secondary dimples may be at most 0.5 times a channel height and/or at most 0.5 times the depth of the main dimples.

A plate heat exchanger includes heat exchange plates and a port, and the port communicates with a predetermined heat exchange space of a plurality of heat exchange spaces. The heat exchange plates of the plate heat exchanger includes a plurality of first heat exchange plates and a plurality of second heat exchange plates. The first heat exchange plate includes: a first heat exchange plate main body; a first opening formed in the first heat exchange plate main body for forming the port; and a first annular protrusion surrounding the first opening, adjoining the first opening and protruding from the first heat exchange plate main body toward a first side in a stacking direction. The second heat exchange plate includes: a second heat exchange plate main body; a second opening formed in the second heat exchange plate main body for forming the port; and a second annular protrusion surrounding the second opening, adjoining the second opening and protruding from the second heat exchange plate main body toward a second side opposite the first side in the stacking direction. The plate heat exchanger according to the embodiments of the present invention can simplify the manufacturing process of the plate heat exchanger, for example.

A heat exchanger has a plurality of metal plates, each metal plate having two contacting surfaces, at least one of the contacting surfaces having a fluid channel and abutting against another metal plate, at least two metal plates connected together with the contacting surfaces facing each other. High temperature is used to melt at least two metal plates together, so that the metal plates can be combined without additional locking or welding.