Long Manufacturing Ltd.

Henri P T Van Helden

Alan K Wu

Bruce L Evans

A heat exchanger and method of transferring heat between fluids is disclosed using a plurality of stacked plate pairs consisting of face-to-face, mating, ringlike plates, each plate having an outer peripheral flange, an annular inner boss located in a common plane with the peripheral flange, and an offset intermediate area located between the peripheral flange and the inner boss. The peripheral flanges and inner bosses in the mating plates are joined together. The intermediate areas have outwardly disposed joined intermediate bosses having aligned inlet and outlet openings forming manifolds for the flow of a first heat exchange fluid circumferentially through the plate pairs from the inlet manifold to the outlet manifold. The heat exchanger also has a header enclosing either the inner bosses or the outer peripheral flanges to cause all of a second heat exchange fluid to pass between the plate pairs transversely relative to the flow of the first heat exchange fluid. Flow augmentation means, such as ribs and grooves, dimples or turbulizers can be used inside or between the plate pairs, if desired.

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Beverley Hills, MI, United States of America

Henri P T Van Helden