A heating, ventilation, and air conditioning (HVAC) system includes a housing and a heat exchanger disposed within the housing. The heat exchanger includes a plurality of tubes where the plurality of tubes extends from a first end to a second end of the heat exchanger. The heat exchanger also includes a plurality of fins coupled to and extending between the plurality of tubes. The heat exchanger further includes a first end sheet disposed at the first end of the heat exchanger and a second end sheet disposed at the second end of the heat exchanger. The heat exchanger also includes a plurality of intermediate sheets disposed between the first end sheet and the second end sheet, where the plurality of tubes extends through each intermediate sheet of the plurality of intermediate sheets, and each intermediate sheet of the plurality of intermediate sheets is coupled to the housing.

Provided is a water heater including a burner that receives a supply of combustion air from a fan, a heat exchanger having a heat transfer tube, and a combustion chamber case in which a combustion chamber of the burner is formed in the interior thereof and which is to be capable of guiding combustion gas generated by the burner to the heat exchanger. The water heater further includes a unit case that surrounds the combustion chamber case, and a region on the outside of the combustion chamber case within the unit case serves as an air pressure chamber having a higher pressure than the combustion chamber. Thus, combustion gas leakage to the outside can be prevented or suppressed appropriately by means of a simple configuration.

An axial flow baffle for a shell and tube heat exchanger includes a substantially planar body configured for transverse arrangement in a longitudinally elongated shell of the shell and tube heat exchanger, a plurality of axial flow tube apertures each comprising a central tube hole configured to receive a tube of the heat exchanger, and an array of peripheral primary flow holes circumferentially spaced apart around the tube hole. The primary flow holes each interrupt the central tube hole and formed a radially inward projecting tube support protrusions between the primary flow holes which engage a single tube. Each primary flow hole has a non-polygonal configuration, which may be semicircular in some embodiments. The primary flow holes create axial flow around the periphery of the tubes through the baffles. In another aspect, a hybrid cross-flow baffle includes a combination of axial flow tube apertures and circular tube support holes.

A water chamber structure for a condenser, including an orifice plate arranged at one end of the condenser; a water cover fixed to the orifice plate in a sealed manner to form a water storage space; and a partition plate assembly for dividing the water storage space into a water inlet chamber and a water outlet chamber in a sealed manner, including: a first partition plate, the top and side walls of the first partition plate are fixed to the inner walls of the water cover; and a second partition plate, the top of the second partition plate is fixedly connected with the bottom of the first partition plate, the bottom of the second partition plate is fixed to the orifice plate, and the side walls of the second partition plate are connected with the inner walls of the water cover in a sealed manner.

The invention relates to a heat treatment device for heating liquid confectionery product, including: a shell body enclosing an interior space, a plurality of successive spaced apart segmental baffles in a segmented arrangement within the interior space, a bundle of heat exchange pipes within the interior space, the pipes extending through the segmental baffles, and an inlet through which to be heated liquid confectionery product is allowed to enter the interior space, and an outlet through which heated liquid confectionery product is allowed to exit the interior space, wherein the successive segmental baffles are arranged such as to form a flow channel extending between the inlet and the outlet, wherein the segmental baffles have a rectangular shape, and wherein the shell body has a rectangular internal cross-section, such that the flow channel has a substantially rectangular cross-sectional shape along its length. The invention further relates to a method for heating liquid confectionery product.

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 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.

An HVAC heat exchanger with an array of tubes including one or more dead tubes is provided. In one embodiment, the heat exchanger is a microchannel heat exchanger operable to exchange heat with air in an HVAC system via refrigerant passing through the microchannel heat exchanger. The microchannel heat exchanger includes an array of flat tubes arranged between a first manifold and a second manifold. The array of flat tubes includes multiple tubes coupled in fluid communication with the first manifold and the second manifold to convey refrigerant between the first manifold and the second manifold through microchannels of the multiple tubes. The array of flat tubes also includes one or more dead tubes that do not convey refrigerant between the first manifold and the second manifold. Additional systems, devices, and methods are also disclosed.

A heat exchanger includes a separator member that divides a first flow passage from a second flow passage. The heat exchanger also includes a plurality of first hollow members that extend across the first flow passage at respective non-orthogonal angles. The plurality of first hollow members are fluidly connected to the second flow passage. Moreover, the heat exchanger includes a plurality of second hollow members that extend across the second flow passage at respective non-orthogonal angles. The plurality of second hollow members are fluidly connected to the first flow passage.

A shell and tube heat exchanger includes a tube bundle for passage of a first medium from a first inlet to a first outlet. A second medium flows through a flow space which surrounds the tube bundle. The tube bundle includes first tubes communicating with the first inlet, and second tubes communicating with the first outlet and fluidly connected to the first tubes. The first tubes define an outer enveloping surface which is predominantly adjacent to an enveloping surface of the second tubes. A separating body between the first inlet and a tubesheet which separates the flow space from the first medium prevents the first medium from flowing against the tubesheet and includes inlet tubes which bridge a compensation space between the separating body and the tubesheet and which protrude into the first tubes to direct the first medium into the first tubes while bypassing the tubesheet.