Abstract: A two fluid heat exchanger adapted for utilization in an exhaust gas recirculation system of an automotive internal combustion engine to reduce the temperature level of the exhaust gas from the combustion cycle that is metered from the exhaust manifold and recycled through the combustion cycle. The heat exchanger includes a plurality of generally elliptical perforated plates stacked together with end caps; each plate having a peripheral flange, an inlet opening for a first fluid defined by a flange, an outlet opening for the first fluid defined by a flange, and several elongated openings for a second fluid defined by flanges. All of the flanges project from one surface of the plate to engage the unflanged surface of the next adjacent plate with the various openings axially aligned to form continuous passages. The plates may have louvres therein, and the flanges defining the inlet and outlet openings have lateral openings therein to communicate with the spaced formed between the plates.

Abstract: A two fluid heat exchanger adapted for utilization in an exhaust gas recirculation system of an automotive internal combustion engine to reduce the temperature level of the exhaust gas from the combustion cycle that is metered from the exhaust manifold and recycled through the combustion cycle. The heat exchanger has a generally flat configuration with a first pair of flanged dished plates forming an inner chamber and a second pair of flanged dished plates encompassing the first pair of plates to form a fluid envelope around the inner chamber. The flanges of the pairs of plates are joined together with a spacing between the walls of the pairs of plates at the opposite ends with the inner flanges having openings therethrough to communicate between the upper and lower portions of the envelope.