The invention relates to a heat exchanger for transferring heat between two fluids with different temperature, said heat exchanger comprises a first heat exchange element (10, 11), said first heat exchange element (10, 11) having at least one core (20, 21) extending longitudinally through the heat exchange element, said at least one core (20, 21) defining a core cavity, said cavity being configured with an inlet port 22a and an outlet port 22b to receive a first fluid flowing there through, said heat exchange element (10, 11) having ribs (30) extending continuously substantially in parallel with the at least one core (20, 21) along the whole length of said core (20, 21), said ribs (30) extending radially outwardly from the core (20, 21) and being exposed to contact with a second fluid, flowing along said ribs (30). The invention being distinctive in that each said rib (30, 31) is divided into at least two radially extending fins (33, 34, 35, 36) at a radial distance from the core (20, 21), each said fin (33, 34, 35, 36) extends to a proximity of an outer casing surrounding said first heat exchanger element (10, 11) or a proximity of fins (33,34, 35, 36) of an additional heat exchanger element (10, 11), said additional heat exchanger element (10, 11) being arranged adjacent to said first heat exchanger element (10, 11), said inlet port (22a) and said outlet port (22b) being coupled to said core (20, 21) at the same end of the core (20a, 21a)

The invention relates to a heat exchanger for transferring heat between two fluids with different temperature, said heat exchanger comprises a first heat exchange element (10, 11), said first heat exchange element (10, 11) having at least one core (20, 21) extending longitudinally through the heat exchange element, said at least one core (20, 21) defining a core cavity, said cavity being configured with an inlet port 22a and an outlet port 22b to receive a first fluid flowing there through, said heat exchange element (10, 11) having ribs (30) extending continuously substantially in parallel with the at least one core (20, 21) along the whole length of said core (20, 21), said ribs (30) extending radially outwardly from the core (20, 21) and being exposed to contact with a second fluid, flowing along said ribs (30). The invention being distinctive in that each said rib (30, 31) is divided into at least two radially extending fins (33, 34, 35, 36) at a radial distance from the core (20, 21), each said fin (33, 34, 35, 36) extends to a proximity of an outer casing surrounding said first heat exchanger element (10, 11) or a proximity of fins (33,34, 35, 36) of an additional heat exchanger element (10, 11), said additional heat exchanger element (10, 11) being arranged adjacent to said first heat exchanger element (10, 11), said inlet port (22a) and said outlet port (22b) being coupled to said core (20, 21) at the same end of the core (20a, 21a)

A heat exchanger for a boiler or similar heating device comprises a casing and a tube assembly inside the casing. The tube assembly includes a plurality of modules (6.sub.x, 6.sub.y) arranged in a juxtaposed configuration, each module (6.sub.x, 6.sub.y) having an at least approximately annular shape. The modules (6.sub.x,6.sub.y) each include a respective tube (7) that is at least partially embedded in a respective thermally conductive body (8) overmoulded to the tube (7). Each thermally conductive body (8) defines an upper face and a lower face of the respective module (6.sub.x, 6.sub.y), where at least at the upper face of a first module (6.sub.y) and the lower face of a second module (6.sub.x) the corresponding thermally conductive body (8) defines upper fins (24) and lower fins (23.sub.x), respectively, which extend in height substantially in an axial direction of the tube assembly and extend in length substantially in a radial direction of the tube assembly (5). The upper fins (24) of the thermally conductive body (8) of the first module (6.sub.y) are in an axially staggered position with respect to the lower fins (23.sub.x) of the thermally conductive body (8) of the second module (6.sub.x), with the upper fins (24), on the one hand, and with the lower fins (23.sub.x), on the other hand, which are at mutual distances such that the upper fins (24) of the thermally conductive body (8) of the first module (6.sub.y) are set between the lower fins (23.sub.x) of the thermally conductive body (8) of the second module (6.sub.x), or vice versa. In this way, between each upper fin (24) of the thermally conductive body (8) of the first module (6.sub.y) and each lower fin (23.sub.x) of the thermally conductive body (8) of the second module (6.sup.x), or vice versa, a respective radial passageway (P) is defined for the combustion fumes produced by a burner equipping the heat exchanger.

A heat exchanger for a boiler or similar heating device comprises a casing and a tube assembly inside the casing. The tube assembly includes a plurality of modules (6.sub.x, 6.sub.y) arranged in a juxtaposed configuration, each module (6.sub.x, 6.sub.y) having an at least approximately annular shape. The modules (6.sub.x,6.sub.y) each include a respective tube (7) that is at least partially embedded in a respective thermally conductive body (8) overmoulded to the tube (7). Each thermally conductive body (8) defines an upper face and a lower face of the respective module (6.sub.x, 6.sub.y), where at least at the upper face of a first module (6.sub.y) and the lower face of a second module (6.sub.x) the corresponding thermally conductive body (8) defines upper fins (24) and lower fins (23.sub.x), respectively, which extend in height substantially in an axial direction of the tube assembly and extend in length substantially in a radial direction of the tube assembly (5). The upper fins (24) of the thermally conductive body (8) of the first module (6.sub.y) are in an axially staggered position with respect to the lower fins (23.sub.x) of the thermally conductive body (8) of the second module (6.sub.x), with the upper fins (24), on the one hand, and with the lower fins (23.sub.x), on the other hand, which are at mutual distances such that the upper fins (24) of the thermally conductive body (8) of the first module (6.sub.y) are set between the lower fins (23.sub.x) of the thermally conductive body (8) of the second module (6.sub.x), or vice versa. In this way, between each upper fin (24) of the thermally conductive body (8) of the first module (6.sub.y) and each lower fin (23.sub.x) of the thermally conductive body (8) of the second module (6.sup.x), or vice versa, a respective radial passageway (P) is defined for the combustion fumes produced by a burner equipping the heat exchanger.

A method of forming a cast heat exchanger plate includes forming at least one hot core plate defining internal features of a one piece heat exchanger plate and at least one first set of interlocking features. At least one cold core plate is formed defining external features of the heat exchanger plate and at least one second set of interlocking features. A core assembly is assembled wherein each hot core plate is directly interlocked to the at least one cold core plate. A wax pattern is formed with the core assembly. An external shell is formed over the wax pattern. The wax pattern is removed to form a space between the core assembly and the external shell. The space is filled with a molten material and cures the molten material. The external shell is removed. The core assembly is removed. A core assembly for a cast heat exchanger is also disclosed.

Flow paths and boundary layer restart features are provided. For example, a flow path comprises a flow path wall defining an inner flow path surface and an asymmetric notch defined in the flow path wall. The asymmetric notch comprises a first surface and a second surface and is asymmetric about a first line extending through an intersection of the first and second surfaces. Further, a flow boundary layer restart feature comprises a first surface extending inward with respect to a flow path surface of a flow path and a second surface extending inward with respect to the flow path surface. The second surface is asymmetric with respect to the first surface such that the first and second surfaces define an asymmetric notch. Additionally, a flow path wall may comprise an asymmetric notch that includes a flow expansion angle and a flow contraction angle that are unequal.

A heat exchanger includes: refrigerant channels that extend in a first direction, are disposed along a second direction intersecting with the first direction, and are disposed along a third direction intersecting with the first direction and the second direction; and heat transfer tubes defining the refrigerant channels. One or both of a size of an outer edge and a size of an inner edge of the heat transfer tubes are different between a first position and a second position in the first direction. Outer surfaces of the heat transfer tubes each include a protrusion that protrudes in a direction intersecting with the first direction, and is in contact with an outer surface of one of the heat transfer tubes adjacent thereto in the second direction. The protrusion includes a concave portion extending along the third direction.

A heat exchanger includes fins and a plurality of pairs of cut-and-raised parts. Each pair of the cut-and-raised parts are positioned on both left and right sides in a width direction on a downstream side in a heating gas flowing direction around an outer circumference surface of each of upstream pipe body parts and face a downstream part on the outer circumference surface with a first gap therebetween. A width between upstream end parts of each pair of the cut-and-raised parts is larger than an outer diameter of each of the upstream pipe body parts. In addition, each pair of the cut-and-raised parts are inclined such that a width between downstream end parts becomes smaller than the width between the upstream end parts. A heating gas passing part having a width narrower than a dimension therebetween is provided in a region between two adjacent upstream pipe body parts.

A heat exchanger includes fins and a plurality of pairs of cut-and-raised parts. Each pair of the cut-and-raised parts are positioned on both left and right sides in a width direction on a downstream side in a heating gas flowing direction around an outer circumference surface of each of upstream pipe body parts and face a downstream part on the outer circumference surface with a first gap therebetween. A width between upstream end parts of each pair of the cut-and-raised parts is larger than an outer diameter of each of the upstream pipe body parts. In addition, each pair of the cut-and-raised parts are inclined such that a width between downstream end parts becomes smaller than the width between the upstream end parts. A heating gas passing part having a width narrower than a dimension therebetween is provided in a region between two adjacent upstream pipe body parts.

A tubing element for a heat exchanger is at least partially a rigid elongated tubing having a first end, a second end, a first side wall and a second side wall. First and second side walls are substantially parallel to each other. The distance between first side wall and second side wall is considerably smaller than the width of first side wall and second side wall, resulting in a substantially overall flat tubing structure with connection walls on both sides. The tubing element has a plurality of fins on at least one of the outer surfaces of the first side wall and/or of the second side wall. Fins define an angle enclosed by the fins and a connection wall. A heat exchanger, use of a tubing element, use of a heat exchanger and method of manufacturing of a tubing element to manufacture at least partially a heat exchanger are included.