Patent ID: 8196646

Claim:
A heat exchanger assembly comprising: a first heat exchanger for receiving a flow of air in a transverse direction; a second heat exchanger disposed adjacent said first heat exchanger for receiving the flow of air in said transverse direction from said first heat exchanger; said first heat exchanger including a plurality of first tubes being spaced from one another and defining a fin space between adjacent first tubes; a plurality of first air fins disposed in said fin spaces and engaging said adjacent first tubes; said second heat exchanger including a plurality of second tubes being spaced from one another by said fin space and aligned in said transverse direction with said first tubes; a plurality of second air fins disposed in said fin spaces and engaging said adjacent second tubes and being aligned in said transverse direction with said first air fins; a plurality of middle connecting portions extending in said transverse direction between said aligned first and second air fins through which heat may be conducted; each of said middle connecting portions defining a slot for reducing heat conduction between said first air fins engaging said first heat exchanger and said second air fins engaging said second heat exchanger for impeding heat transfer between the first air fin and second air fins; and each of said slots in said middle connecting portions being disposed closer to said first tubes than to said second tubes for maximizing the heat transfer area and effectiveness of said second air fins; wherein each of said middle connecting portions defines a serrated edge at said slot for inducing turbulence in the flow of air to increase heat transfer between the flow of air and said second air fins.