Abstract: A tab for joining together a plurality of adjacent, contiguous plate menders of a plate tube heat exchanger is disclosed. The tab comprises a generally planar web interconnecting adjacent plates. The web includes a first edge having a plurality of recesses disposed at predetermined locations therealong and a second edge having a plurality of recesses disposed opposite the plurality of recesses along the first edge. The plurality of recesses define first and second bend zones which provide proper plate-to-plate contact when forming the plate tubes as well as proper fin height spacing between adjacent pairs of plate tubes.

Abstract: A corrugated heat exchanging fin assembly for use with a heat exchanger having fluid conduits is disclosed. The fin assembly includes a plurality of fin elements, each fin element including a first plurality of louvers extending therefrom and disposed at a predetermined angle to the plane of the fin element. Each fin element further includes a second plurality of louvers extending therefrom and configured to intersect the plane of the fin element to prevent nesting of stacked rows of pluralities of fin assemblies.