Patent ID: 8596339

Claim:
A heat exchanger comprising: a manifold structure ( 26 ) defined by a pair of stacked plates ( 70 , 72 ) which define a void, one of the pair of stacked plates ( 70 ) having three or more aperture-surrounding bosses ( 84 ) which project into the void and the other ( 72 ) of the pair of stacked plates having a plurality of protuberances each of said protuberances engaging between a respective pair of the three or more aperture-surrounding bosses ( 84 ), the bosses in said respective pair being adjacent to one another; and a heat exchange element ( 12 ) formed of a plurality of stacked plates ( 22 , 24 ), the plurality of stacked plates ( 22 , 24 ) defining a stack of tubes ( 16 ) which stack interiorly defines a first plurality of U-shaped passages ( 18 ), the passages of said plurality of U-shaped passages ( 18 ) being distinct from one another, each of said tubes defining a respective one of the U-shaped passages, each tube ( 16 ) being received in plug-fit relation by a respective one of the aperture-defining bosses ( 84 ) so that the tubes, the bosses and the protuberances separate the void into a pair of manifolds and so that each of the first plurality of U-shaped passages ( 18 ) leads from one of the manifolds ( 32 ) of the pair of manifolds to the other ( 34 ) of the manifolds of the pair of manifolds.