The invention relates to a plate-and-shell heat exchanger apparatus and a channel blocking plate for a plate-and-shell heat exchanger. The heat exchanger comprises a shell and a plurality of heat transfer plates within the shell. The plates form fluidly connected first cavities for providing a first fluid flow path for a first fluid flow. The shell forms a second cavity in which the plates are arranged and a second fluid flow path is provided for a second fluid flow, separated from the first fluid flow path by the plates. The heat exchanger comprises means for reducing detrimental bypass flows within the heat exchanger.

A water heater includes an outer casing defining a longitudinal axis, an axial direction being defined as extending along the longitudinal axis. The water heater further includes a combustor for production of hot flue gases, a primary heat exchanger including a tube positioned within the outer casing, and a secondary heat exchanger including a plurality of plates coupled together by brazing to form a brazed plate heat exchanger. The secondary heat exchanger includes a first set of passages defined between the plates, and a second set of passages defined between the plates and alternating with the first set of passages in the axial direction. The primary and secondary heat exchangers are in fluid communication such that the flue gases flow through the second set of passages before being exhausted, and water to be heated flows through the first set of passages to a delivery point for use upon demand.

Disclosed herein is an apparatus comprising a shell; the shell having an inlet port for introducing a polymer solution into the shell and an outlet port for removing the polymer solution from the shell; wherein the polymer solution comprises a polymer and a solvent that is operative to dissolve the polymer; a plurality of plates in the shell; where the plurality of plates is stacked one atop the other to define a central passage that is in fluid communication with the inlet port of the shell; where the plurality of plates further defines a plurality of conduits, each conduit extending radially outwards from the central passage, where the plurality of conduits is in fluid communication with the central passage; and where the apparatus is operated at a pressure and a temperature effective to maintain the polymer solution in a single phase during its travel through the apparatus.

Disclosed herein is a distributor comprising a first conduit; where the first conduit has an inlet port for charging a heating fluid into the distributor; a second conduit; where the first conduit lies inside the second conduit to define a first annular space therebetween; where the second conduit has an exit port for removing the heating fluid from the distributor; a plurality of plate stacks disposed around the second conduit to define a narrowing second annular space from top to bottom of the distributor; where each successive plate stack has smaller inner diameter than the plate stack located above it; where each plate stack comprises a plurality of plates; where the plurality of plates further define a plurality of conduits, each conduit having a varying width over its length and extending radially outwards from the central passage.

An embodiment of the present subject matter includes a heat exchange part having heating medium channels, through which heating medium flows, and combustion gas channels, through which combustion gas burned in a burner flows, adjacently disposed in alternation in the spaces between the plurality of plates, wherein the heat exchange part surrounds the outer sides of a central combustion chamber space, a plurality of the heat exchange parts are provided in a stacked structure, and the flow direction of the heating medium is unidirectional only in a part of the heating medium channels from among the heating medium channels provided in each layer.

A deflector for a condensation heat exchanger and to an exchanger provided with such a deflector. The deflector includes two front and rear cups with inner surfaces at the bottom designed in relief so as to have at least one circulation groove. The two cups are assembled on either side of a central partition so that each groove forms, with the partition, a channel in which a heat-transfer fluid is intended to circulate. The channels of the front and rear cups are connected via an opening bored into the central partition, so that the heat transfer fluid can circulate from an inlet coupling to an outlet coupling of the deflector, through the channels by flowing on either side of the central partition.

A heat exchange spacer is for assembly with a heat exchange core. The heat exchange spacer has a unitary body including a first elongate portion and a second elongate portion. The first elongate portion and the second elongate portion define an angle therebetween.

A plate for use in a heat exchanger is includes: a first surface; a second surface; first, second and third discrete flow passages passing through the plate from the first surface to the second surface, the second flow passage extending around the first flow passage and the third flow passage extending around the second flow passage. A plurality of fins extend parallel to the first surface across the third flow passage and have a first surface extending parallel to the first surface of the plate and a second surface extending parallel to and spaced from the first surface of the fin; and one or more pins protruding from the first surface of at least some of the fins. The pins extend away from the second surface of the fins.

Various embodiments include heat exchangers and methods of making heat exchangers from a series of stacked plates each made of two foil sheets bonded together in bonding locations forming fluid flow passages between the foil sheets in regions where the foil sheets are not bonded. An inlet port and an outlet port located at opposite ends of the planar extent of the two foil sheets extend through the foil sheets perpendicular to the planar extent of the foil sheets. The inlet and outlet ports provide access for a first fluid to flow into or out of the internal plate passages formed between the two foil sheets. Interstitial channels are formed between the series of plates and configured to allow the flow of a second fluid between the series of plates, allowing heat to be transferred between the two fluids while isolating the two fluids from one another.

A heat exchanger includes a core defining a first passageway configured for a first fluid to flow through and a second passageway configured for a second fluid to flow through. The core includes a plurality of unit cells coupled together. Each unit cell of the plurality of unit cells includes a sidewall at least partly defining a first passageway portion, a second passageway portion, a plurality of first openings for the first fluid to flow through, and a plurality of second openings for the second fluid to flow through. Each unit cell of the plurality of unit cells is configured to enable the first fluid to combine and divide in the first passageway portion. Each unit cell is further configured to enable the second fluid to combine and divide in the second passageway portion.