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A heat exchanger is provided by assembling a plurality of individual plates having opposed faces, wherein flow channels are machined through those opposed faces, and the plates are interconnected with intervening shim plates. End plates are connected to an assembly of such plates and intermediate pl

A heat exchanger is provided by assembling a plurality of individual plates having opposed faces, wherein flow channels are machined through those opposed faces, and the plates are interconnected with intervening shim plates. End plates are connected to an assembly of such plates and intermediate plates, to form a preform, which is then machined to a desired cross section. The resulting structure has a plurality of passages therethrough in one direction, and a second plurality of passages therethrough in a second direction, the passages fluidly isolated from one another. The resulting structure is configurable to a specific geometry of a flow passage, and enables heat exchange between fluids passing through the different flow channels.

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1. A heat exchanger having a first side and an opposed second side, comprising: a plurality of individual heat exchange elements, each of said elements including: a first flow passage configured to be communicable with a first fluid flow passing through the heat exchanger only in a direction from th

1. A heat exchanger having a first side and an opposed second side, comprising: a plurality of individual heat exchange elements, each of said elements including: a first flow passage configured to be communicable with a first fluid flow passing through the heat exchanger only in a direction from the first side to the second side thereof; anda second flow passage, fluidly isolated from said first flow passage, configured to be communicable with a second fluid flow passing through the heat exchanger only in a direction transverse to the flow direction of the first fluid flow passage; andan intermediate member, different than an individual heat exchange element, interposed between said first flow passage of one of said heat exchange elements and the second flow passage of another of said heat exchange elements. 2. The heat exchanger of claim 1, wherein at least one of said flow passages includes a plurality of fins therein. 3. The heat exchanger of claim 1 wherein a web extends between said first and said second flow passages of said heat exchange elements. 4. The heat exchanger of claim 1, wherein said intermediate member enables heat exchange therethrough. 5. The heat exchanger of claim 1, wherein said intermediate member and said individual heat exchange elements are brazed together. 6. The heat exchanger of claim 3, wherein said web enables heat exchange between said first flow passage and said second flow passage of said same member. 7. The heat exchanger of claim 1, wherein the plurality of heat exchange elements comprise a plurality of individual plates each having a first flow passage and a second flow passage extending therethrough, and a cap plate provided in parallel with and on either side of the plurality of individual plates, wherein the length of the second flow passages in the individual plates adjacent to the cap plates of the heat exchanger is shorter as compared to the central regions of the heat exchanger. 8. The heat exchanger of claim 7, wherein a gas flows through the plurality of first flow passages provided by the plurality of individual plates and a fluid flows through the plurality of second flow passages provided by the plurality of individual plates. 9. A heat exchanger, comprising: a plurality of plates stacked one upon the other, each of said plates having a first axis of symmetry and a second axis of symmetry;a plurality of openings disposed in rows parallel to said first axis of symmetry, the position of said rows being symmetric to either side of said first axis of symmetry, and the position of said openings being symmetric to either side of said second axis of symmetry, and the openings of each plate aligned to form a continuous flow channel extending through each of the aligned openings of each of the plurality of plates stacked one upon the other; anda plurality of rows of slots separated by lands, said rows of slots and lands being disposed intermediate of said rows of openings and generally parallel thereto, said rows being disposed to either side of said first axis of symmetry and symmetrically distanced therefrom, and said lands and slots being disposed asymmetrically with respect to said second axis of symmetry, the lands disposed such that the lands of a plate in the plurality of plates do not overlie the lands of an adjacent plate in the plurality of plates;wherein said lands and slots of adjacent plates form a tortuous pathway through the heat exchanger, the tortuous pathway extending transverse to the flow path of said aligned openings. 10. The heat exchanger of claim 9, wherein said openings include a plurality of fins, disposed generally parallel to each other with apertures extending therebetween, therein, said apertures providing individual flow passages through the openings through the heat exchanger. 11. The heat exchanger of claim 10, wherein said openings are formed from aligned apertures extending through said individual plates. 12. The heat exchanger of claim 11, further including a first end plate having an inlet and an outlet therethrough, and a second end plate. 13. The heat exchanger of claim 1, wherein the flow passages further comprise a base and one or more side walls, and wherein a plurality of fins extend from the base substantially parallel to the side walls. 14. The heat exchanger of claim 1, wherein an end cap is disposed against an intermediate member at either end of the heat exchanger. 15. The heat exchanger of claim 7, wherein a plurality of shim holes are formed through the cap plates. 16. The heat exchanger of claim 9, wherein the flow passages further comprise a base and one or more side walls, and wherein the plurality of fins extend from the base substantially parallel to the side walls. 17. The heat exchanger of claim 9, wherein the heat exchanger comprises the plurality of plates, wherein the plates are aligned to align the openings through the individual plates to form continuous flow channels through a thickness dimension of the heat exchanger. 18. The heat exchanger of claim 9, further comprising a manifold cutouts with a generally arcuate shape fluidly connecting to the plurality of rows of slots. 19. The heat exchanger of claim 18, wherein the manifold cutouts have a generally arcuate shape.