Patent ID: 8485248

Claim:
A heat exchanger assembly for transferring heat between a coolant and a stream of air, comprising: a first manifold; a second manifold spaced from said first manifold; a cross-over plate disposed in one of said first and second manifolds for dividing the associated manifold into an upstream section on one side of said cross-over plate and a downstream section on the other side of said cross-over plate; said cross-over plate defining at least one orifice for establishing fluid communication between said upstream and downstream sections of the associated manifold; a core extending between said first and second manifolds for transferring heat between the stream of air and the coolant; said core including a plurality of tubes defining a plurality of upstream flow paths in fluid communication with said upstream section and a plurality of downstream flow paths in fluid communication with said downstream section; said upstream flow paths defining an upstream cross-sectional area and said downstream flow paths defining a downstream cross-sectional area; said at least one orifice of said cross-over plate defining a cross-over opening area; and wherein said cross-over opening area of said cross-over plate is 30% to 300% of said upstream cross-sectional area of said upstream flow paths; wherein said cross-over plate includes a plurality of orifices; wherein said plurality of orifices are spaced axially from one another; wherein said first manifold extends along an axis between first manifold; ends and said first manifold defines an inlet on one of said first manifold ends; and wherein said spaced orifices sequentially increase in area from a first orifice nearest said inlet to a middle orifice to define a continuously increasing cross-over opening area in said axial direction away from said inlet.