Polymeric tube-in-shell heat exchangers with twisted tubes are provided. The heat exchanger may include one or more polymeric tube bundles, wherein each of the one or more polymeric tube bundles includes at least one tube twisted about its length or at least one pair of tubes twisted or wound around each other. The presently disclosed polymeric tube-in-shell heat exchangers with twisted tubes may be especially suited for applications where the use of polymer tubes offers advantages, such as in the case of acid solutions, food and beverage fluids, and carbon capture applications where the use of metal heat exchangers destroy the amines used for capture.

The present disclosure relates to a wavy smoke tube structure of a boiler, which improves heat exchange efficiency of a smoke tube. The wavy smoke tube structure includes: a main body formed in a columnar shape and having a space therein; a plurality of first concave portions concavely formed along a first side portion in a longitudinal direction of the main body; a plurality of second concave portions concavely formed along a second side portion in the longitudinal direction of the main body opposite to the first side portion and each positioned between a pair of the first concave portions to face them; and a plurality of blocking grooves formed in a pair of sidewall portions provided between the first side portion and the second side portion.

The present disclosure relates to a wavy smoke tube structure of a boiler, which improves heat exchange efficiency of a smoke tube. The wavy smoke tube structure includes: a main body formed in a columnar shape and having a space therein; a plurality of first concave portions concavely formed along a first side portion in a longitudinal direction of the main body; a plurality of second concave portions concavely formed along a second side portion in the longitudinal direction of the main body opposite to the first side portion and each positioned between a pair of the first concave portions to face them; and a plurality of blocking grooves formed in a pair of sidewall portions provided between the first side portion and the second side portion.

A heat exchanger (4) has fluid flow channels (6) with at least one heat exchanging surface (10) which has an undulating surface section for which the surface profile varies along a predetermined direction such that at a first edge (E1) the surface profile follows a first transverse wave (20), at a second edge (E)2 the surface profile follows a second transverse wave (22) and at an intermediate point I between the edges the surface profile follows a third transverse wave (24). The third transverse wave (24) has a different phase, frequency or amplitude to the first and second transverse waves so that chevron-shaped ridges and valleys are formed. This improves the mixing of fluid passing through the channel and hence the heat exchange efficiency.

The present disclosure provides conduits with modified interior surfaces that increase the surface area of the interior surface of the conduit to provide the conduit with improved thermal energy exchange with the wall of the conduit. The modified interior surfaces can also be configured to reduce friction flow on the fluid passing therethrough.

The present disclosure provides conduits with modified interior surfaces that increase the surface area of the interior surface of the conduit to provide the conduit with improved thermal energy exchange with the wall of the conduit. The modified interior surfaces can also be configured to reduce friction flow on the fluid passing therethrough.

An insert for a condensing heat exchanger, having: a body extending aft from a forward end to an aft end, and defining: a body exterior surface; a forward segment that extends aft from the forward end of the insert to a first axial location between the forward and aft ends of the insert, along the forward segment the body exterior surface is without openings; a middle segment that extends aft from the first axial location to a second axial location, along the middle segment the body exterior surface is cylindrical; and an aft segment that extends aft from the second axial location to the aft end of the insert, along the aft segment the body exterior surface of the body is cylindrical and defines axially extending grooves, and the grooves are spaced apart from each other and extend forward from the aft end of the insert to the middle segment.

An insert for a condensing heat exchanger, having: a body extending aft from a forward end to an aft end, and defining: a body exterior surface; a forward segment that extends aft from the forward end of the insert to a first axial location between the forward and aft ends of the insert, along the forward segment the body exterior surface is without openings; a middle segment that extends aft from the first axial location to a second axial location, along the middle segment the body exterior surface is cylindrical; and an aft segment that extends aft from the second axial location to the aft end of the insert, along the aft segment the body exterior surface of the body is cylindrical and defines axially extending grooves, and the grooves are spaced apart from each other and extend forward from the aft end of the insert to the middle segment.

A shell-and-tube heat exchanger with externally-connected tube chambers includes a tube sheet, a shell, heat exchanging tubes, an inlet externally-connected tube chamber, and an outlet externally-connected tube chamber, wherein: the inlet and outlet externally-connected tube chambers are respectively fixed to corresponding positions of the tube sheet, two flow guiding devices are respectively located in the inlet and outlet externally-connected tube chambers, the two flow guiding devices respectively have two cavities therein, multiple flow guide channels outwardly extend from the cavities to the tube sheet and communicated with the tube sheet; one cavity of the outlet externally-connected tube chamber is communicated with a tube side outlet pipe, and one cavity of the inlet externally-connected tube chamber is communicated with a tube side inlet pipe. The shell-and-tube heat exchanger is reasonable in design, can effectively improve the sealing performance and reduce the tube side pressure drop, and has broad application prospects.

A shell-and-tube heat exchanger with distributed inlet-outlets includes a shell, heat exchanging tubes, a tube plate, an outlet fluid distribution device and an inlet fluid distribution device. Each of the inlet and outlet fluid distribution devices includes a tube side connecting pipe and at least one bell-shaped tube. A fine end of the bell-shaped tube is connected with the tube side connecting pipe, the tube side connecting pipe passes through the tube plate, a magnifying sealing plate is installed at a magnifying end of the bell-shaped tube, the magnifying sealing plate has circular holes respectively corresponding to the heat exchanging tubes, the heat exchanging tubes are respectively installed within the circular holes of the magnifying sealing plate and communicated with an interior of the bell-shaped tube. The shell-and-tube heat exchanger is reasonable in design, strong in practicality and simple in preparation process, so that it has broad application prospects.