Heat exchanger

1. A primary heat exchanger for use in an environmental control system of an aircraft, comprising:

a rectangular core having a plurality of alternately stacked first fluid layers and second fluid layers, the rectangular core having a depth to width ratio of about 4.88 and a width to height ratio of about 2.37;

a first header substantially coextensive to a first surface of the core and a second header substantially coextensive to a second, opposite surface of the core, wherein the first header and the second header form a portion of a flow path for a first fluid; and

an inlet flange adjacent a third surface of the core and an outlet flange adjacent a fourth, opposite surface of the core, wherein the inlet flange and outlet flange form a portion of a flow path for a second fluid;

at least one mount adjacent a fifth surface of the core for coupling the primary heat exchanger to the aircraft; and

a transition plate having a first opening adjacent an end of the first header and a second opening adjacent an end of the second header;

wherein each of the first fluid layers and the second fluid layers includes a plurality of corrugated fins that extend from an inlet edge to an outlet edge to form a flow path for a fluid, and a fin configuration of at least one of the first fluid layer and the second fluid layer being configured to vary based on a position of the first fluid layer or second fluid layer within the rectangular core.

2. The primary heat exchanger according to claim 1 , wherein the rectangular core has a width of about 14.7 inches (37.34 cm), a height H of about 6.2 inches (15.75 cm) and a depth D of about 71.7 inches (182.12 cm).

3. The primary heat exchanger according to claim 1 , wherein at least one first fluid layer includes a plurality of corrugated fins having a fin height of about 0.324 inches (0.86 cm), a fin thickness of about 0.005 inches (0.0127 cm) and a fin frequency of about 20 fins per inch (7.87 fins per cm).

4. The primary heat exchanger according to claim 1 , wherein

at least one first fluid layer includes a plurality of corrugated fins having a fin height of about 0.324 inches (0.86 cm), a fin thickness of about 0.003 inches (0.0076 cm) inches and a fin frequency of about 20 fins per inch (7.87 fins per cm).

5. The primary heat exchanger according to claim 1 , wherein

at least one second fluid layer includes a plurality of corrugated fins having a fin height of about 0.5 inches (1.27 cm), a fin thickness of about 0.005 inches (0.0127 cm) and a fin frequency of about 24 fins per inch (9.45 fins per cm).

6. The primary heat exchanger according to claim 1 , wherein

at least one second fluid layer includes a plurality of corrugated fins having a fin height of about 0.5 inches (1.27 cm), a fin thickness of about 0.005 inches (0.0127 cm) and a fin frequency of about 20 fins per inch (7.87 fins per cm).

7. The primary heat exchanger according to claim 1 , wherein at least one second fluid layer includes a plurality of corrugated fins having a fin height of about 0.5 inches (1.27 cm), a fin thickness of about 0.003 inches (0.0076 cm) and a fin frequency of about 20 fins per inch (7.87 fins per cm).

8. The primary heat exchanger according to claim 7 , further comprising a plurality of guard fins adjacent the inlet edge and outlet edge of the second fluid layer, wherein the guard fins have a first fin configuration and the plurality of corrugated fins have a second, different fin configuration.

9. The primary heat exchanger according to claim 8 , wherein the guard fins have a fin height of about 0.5 inches (0.86 cm), a fin thickness of about 0.008 inches (0.02 cm) and a fin frequency of about 9 fins per inch (3.54 fins per cm).

10. The primary heat exchanger according to claim 1 , the flow path of the plurality of first fluid layers is perpendicular to the flow path of the plurality of second fluid layers.