Heat exchanger with corrosion reducing sacrificial component
A heat exchanger for exchanging heat between a first fluid and a second fluid is disclosed in accordance with an embodiment of the present invention. The heat exchanger includes a first manifold, a second manifold, a bundle of heat exchange elements and a housing. The bundle of heat exchange elements for the first fluid axially extend and provide a fluidal communication between the manifolds. The housing for the second fluid encapsulates at least part of the heat exchange elements to form a fluid tight channel for the second fluid. The housing further includes at least one sacrificial component being of material having lower galvanic potential than the remaining components.
1 . A heat exchanger for exchanging heat between a first fluid and a second fluid, the heat exchanger comprising:
a first manifold and a second manifold,
a bundle of heat exchange elements for the first fluid axially extending and providing a fluidal communication between the first and second manifolds,
a housing for the second fluid encapsulating at least part of the heat exchange elements to form a fluid tight channel for the second fluid,
wherein the housing includes at least one sacrificial component being of material having lower galvanic potential than the remaining components, the sacrificial component being a plate that includes at least one opening;
wherein the sacrificial component includes at least one recessed section extending from a median section of the shorter side thereof and at least a pair of projections located on opposite ends of the shorter side thereof, on each side of the at least one recessed section.
2 . The heat exchanger according to claim 1 , wherein the at least one sacrificial component is part of the housing.
3 . The heat exchanger according to claim 1 , wherein the at least one sacrificial component is attached to the housing.
4 . The heat exchanger according to claim 1 , wherein the at least one sacrificial component is attached directly to at least one heat exchange element of the bundle of heat exchange elements.
5 . The heat exchanger according to claim 4 , wherein the heat exchange elements are flat tubes and the at least one sacrificial component is parallel to and in contact with the flat surface of at least one terminal heat exchange element of the bundle of heat exchange elements.
6 . The heat exchanger according to claim 1 , wherein at least one of the manifolds includes a collar at least partially overlapping the bundle of heat exchange elements in assembled configuration of the heat exchanger.
7 . The heat exchanger according to claim 6 , wherein the at least one sacrificial component is fixed between the bundle of heat exchange elements and the collar.
8 . The heat exchanger according to claim 4 , wherein the at least one sacrificial component is the plate that includes at least one opening, so that it partially uncovers the surface of at least one heat exchange elements.
9 . The heat exchanger according to claim 4 , wherein the at least one sacrificial component is a plate that includes four openings, so that it partially uncovers the surface of at least one heat exchange elements, wherein the four openings are located symmetrically with respect to axis of symmetry of the plate, so that a first median bar and a second median bar are created, wherein the median bars intersect each other perpendicularly in the middle of the plate.
10 . The heat exchanger according to claim 1 , wherein the housing is at least partially formed by housing plates, wherein at least one of the housing plates is of Al—Zn alloy.
11 . The heat exchanger as claimed in claim 10 , wherein the proportion of zinc in the Al—Zn alloy is in the range of 1 to 2 percent.
12 . The heat exchanger as claimed in claim 11 , wherein the proportion of zinc in the Al—Zn alloy is 1.5 percent.