HEAT EXCHANGER WITH VARIED LOUVER ANGLES
A heat exchanger assembly includes spaced apart tubes and a fin. The fin extends between and in thermal contact with adjacent tubes. The fin defines a planar portion between adjacent tubes. The planar portion defines a louver. The louver defines an axis about which the louver is rotated relative to the planar portion when the louver is formed. A middle portion of the louver is rotated about the axis to a first angle. A top portion of the louver is rotated about the axis to a second angle greater than the first angle such that the louver angle is varied along the axis. The louver may be characterized along the axis by a continuous transition of angle from the first angle to the second angle. A bottom portion of the louver may be rotated about the axis to a third angle greater than the first angle.
1 . A heat exchanger assembly comprising:
a plurality of parallel spaced apart tubes configured to convey coolant therethrough; and
a fin extended between and in thermal contact with adjacent tubes, wherein the fin defines a planar portion between the adjacent tubes, the planar portion defines a louver, the louver defines an axis about which the louver is rotated relative to the planar portion when the louver is formed, and a middle portion of the louver is rotated about the axis to a first angle, wherein
a top portion of the louver is rotated about the axis to a second angle greater than the first angle such that the louver angle is varied along the axis.
2 . The assembly in accordance with claim 1 , wherein the louver is characterized along the axis by a continuous transition of angle from the first angle to the second angle.
3 . The assembly in accordance with claim 1 , wherein a bottom portion of the louver is rotated about the axis to a third angle greater than the first angle.
4 . The assembly in accordance with claim 3 , wherein the third angle is substantially equal to the second angle.
5 . The assembly in accordance with claim 3 , wherein the louver is characterized along the axis by a continuous transition of angle from the second angle to the first angle, and from the first angle to the third angle.
6 . The assembly in accordance with claim 5 , wherein the third angle is substantially equal to the second angle.
7 . The assembly in accordance with claim 1 , wherein a first louver defines a first axis offset from the planar portion in first direction, and a second louver defines a second axis offset from the planar portion in a second direction opposite the first direction.
8 . The assembly in accordance with claim 1 , wherein the fin includes a first planar portion adjacent to a second planar portion, and the fin is configured to define a radiused portion so the first planar portion is parallel to the second planar portion.