A dew point corrosion resistant heat exchanging system having a plurality of hollow heat transferring tubes through which cooler ambient air or hot combustion product gases flow. The other of the air or gas flows across the outer surfaces of the tubes, and heat is transferred from the hot gases to the ambient air, thus heating the air. A portion of the tubes includes an inner liner forming an air pocket chamber between the liner and the outer wall of the tube. The air pocket chamber provides heat transfer advantages that maintain the tubes at a temperature above the dew point of the gases in the system, thus inhibiting corrosion of the tubes.

A heat exchange device includes a housing having an opening on one side, and a heat exchange core body. The heat exchange device also includes a connection block provided with a first channel, a second channel, a first interface, and a second interface. The connection block is also provided with a first socket of the first channel, and a first socket of the second channel. The heat exchange core body includes at least one flat tube. At least one part of one end of the flat tube extends into the first socket of the first channel and is mounted in a sealed manner with the first socket of the first channel, and at least one part of the other end of the flat tube extends into the first socket of the second channel and is mounted in a sealed manner with the first socket of the second channel.

A heat exchanger unit according to the present invention comprises: a sensible heat exchanger including a sensible heat exchange pipe disposed in a sensible heat exchange area for heating water used for heating by receiving sensible heat generated by a combustion reaction, wherein the sensible heat exchange pipe receives the water used for heating and flows same through the interior, and a sensible heat fin disposed in the sensible heat exchange area, wherein the sensible heat fin is formed in a plate shape across the sensible heat exchange pipe and penetrated by the sensible heat exchange pipe; and a latent heat exchanger positioned downstream from the sensible heat exchange area on the basis of a reference direction, which is a flow direction of combustion gas generated during the combustion reaction, the latent heat exchanger including a latent heat exchange pipe disposed in a latent heat exchange area.

A heat-exchanger unit according to the present invention comprises: a sensible-heat heat-exchange portion arranged in a sensible-heat heat-exchange area for receiving sensible heat generated by a combustion reaction and thereby heating water, the sensible-heat heat-exchange portion having a sensible-heat heat-exchange pipe for receiving the water and causing same to flow through the interior thereof, thereby forming a sensible-heat channel along which the water flows; and a latent-heat heat-exchange portion positioned downstream of the sensible-heat heat-exchange area with reference to a first reference direction along which combustion gas generated during the combustion reaction flows, the latent-heat heat-exchange portion being arranged in a latent-heat heat-exchange area for receiving latent heat generated during a phase change of the combustion gas and thereby heating the water, the latent-heat heat-exchange portion having a latent-heat heat-exchange pipe for receiving the water and causing same to flow through the interior thereof.

A water heater (WH) comprises: a primary heat exchanger (H1) that recovers heat from heating gas; a secondary heat exchanger (H2); and a heating gas flow regulator (48, 40a) for regulating the flow of heating gas so that heating gas flowing inside a first case (2) of the primary heat exchanger (H1) in an area near at least one side wall part (20) of the first case (2) is prevented from entering designated gaps (C2, C3) in the secondary heat exchanger (H2). Thus, high temperatures in side wall parts (50) of the secondary heat exchanger (H2) can be suitably prevented and heating efficiency can be suitably improved.

A heat exchanger duct includes a wall having ends spaced along a central axis. An inlet manifold is positioned within a downstream portion of the duct at a radially outward location. An outlet manifold is positioned within an upstream portion of the duct at a radially outward location. At least one of the inlet and outlet manifolds extend at least 10 degrees around the circumference of the duct. A central manifold is disposed between the inlet and outlet manifolds, and radially inwardly of the inlet and outlet manifolds. Heat exchanger entrance elements extend radially inward from the inlet manifold to the central manifold, and heat exchanger exit elements extend radially outward from the central manifold to the outlet manifold. A gas turbine engine is also disclosed.

A heat exchanger includes: a casing into which heating gas is supplied; and a plurality of heat transfer tubes which are arranged in the casing, wherein the plurality of heat transfer tubes are set in a posture in which a plurality of straight tube portions are arranged in a direction intersecting a heating gas flow direction, are stacked a plurality of stages in the heating gas flow direction, and are distinguished into first and second heat transfer tubes respectively located on an upstream side and a downstream side in the heating gas flow direction, and wherein the second heat transfer tube is formed so that an outer diameter of the tube and an arrangement pitch of the plurality of straight tube portions are smaller than those of the first heat transfer tube.

A heat exchanger comprises a jacket element and an insert element, the jacket element forming a fluid channel for a fluid to be tempered, a flowable medium or a fluid mixture. The insert element is arranged in the fluid channel. The insert element contains a plurality of web elements which are connected to the jacket element at different locations. At least some of the web elements contain web element passages which are in fluid-conducting connection with the jacket element so that, in the operating state, a heat transfer fluid which is fed to the jacket element can flow through the web elements, wherein the jacket element contains a plurality of chambers for a heat transfer fluid, wherein at least one of the chambers is disposed with a plurality of inlet openings and outlet openings for the heat transfer fluid.

A water heater can include a heat source and a heat exchanger that transfers heat to the water. A header attached to the heat exchanger provides an inlet and an outlet for water to flow into and out of the heat exchanger. The header can also include an anode assembly that releasably attaches to the header. The anode assembly can be located at a bottom of the header so that an anode in the anode assembly remains in contact with the water when water is flowing through the heat exchanger.

Provided are heat exchangers that have a plurality of integrally formed contiguous unit cells defining a three-dimensional lattice of repeating unit cells, and methods of forming a baffle in a three-dimensional lattice structure of a heat exchanger. The plurality of integrally formed contiguous unit cells include a plurality of pathway cells and a plurality of baffle cells integrally formed among the plurality of pathway cells. The plurality of pathway cells have a solid domain that includes interior and exterior pathway-cell surfaces that respectively contiguously define first and second furcated fluid domains for a first fluid and a second fluid to respectively flow across the plurality of pathway cells. The plurality of baffle cells have a solid domain that includes one or more furcated-pathway blinds that together provide one or more furcated-pathway baffles that contiguously define a boundary to a furcated fluid domain.