Patent ID: 6364007
Filing Date: 2002-04-02
Classification: F28D,F28F

Abstract:
A counterflow heat exchanger comprising in combination:a plurality of inner ducts forming a plurality of fluid passages, said inner ducts arranged in a stacked disposition; each of said inner ducts having a middle portion, a first end portion through which fluid passes and a second end portion through which fluid passes wherein said middle portion has a reduced depth dimension in comparison to depth dimensions of said first and said second end portions; said first and said second end portions of each inner duct for supporting said plurality of inner ducts in said stacked disposition, said first and said second end portions of each inner duct being in direct contact with first and second end portions of an adjacent inner duct; a first seal formed about first end portions of said plurality of inner ducts in said stacked disposition and a second seal formed about second end portions of said plurality of inner ducts in said stacked disposition; and an outer duct mounted about said plurality of inner ducts in said stacked disposition and said first and said second seals, and forming with middle portions of said plurality of inner ducts and between said seals, a plurality of fluid passageways wherein the plurality of fluid passages within said inner ducts are separated from the plurality of fluid passageways.