Counter-current bumped plates heat exchanger

A counter current heat exchanger comprising a plurality of spaced apart parallel plates having spacer means therebetween for separating said plates and for spreading the flow of fluid between said plates over the entire surface area of said plates, housing means completely closing the spaces between said plates along two opposed sides of said plates, said housing means defining a plurality of rows of spaced apertures between said plates along the other two opposed sides of said plates with the apertures in alternate rows being offset from each other, primary inlet and outlet collector means secured to said housing means and co-extensive with the sides of said housing means having said apertures, each of said collector means comprised of the one-piece zig-zag shaped wall member with adjacent portions of said wall member being disposed at right angles to each other so that alternate portions of said wall members are parallel to each other, said parallel wall portions having identical triangular configurations disposed perpendicular to said plates between said apertures so that alternate spaces between said triangular plates communicate with the apertures in alternate rows and secondary inlet and outlet collector means being comprised of wall means surrounding said primary collector means and disposed perpendicular to said apertured sides of said housing means, each of said secondary collector means in conjunction with each primary collector means defining two plenum chambers each having a triangular cross-section on opposite sides of said primary collector means.