Patent ID: 7703505
Filing Date: 2010-04-27
Classification: F28D,F28F

Abstract:
1. A heat exchanger comprising: (a) a plurality of elongate, double tube conduits having opposed end portions, wherein each said double tube conduit comprises a first tube and a second tube, each said tube comprising a pair of planar walls which are arranged in spaced-apart, parallel, facing relation to one another, with an internal flow passage defined between the planar walls of each said tube, said first tube having a raised peripheral edge portion which extends along an entire outer periphery of said first tube and which is joined to an outer periphery of the second tube to define an intermediate flow channel between one said planar wall of said first tube and one said planar wall of said second tube, with said planar walls being in spaced-apart, parallel, facing relation to one another, wherein the internal flow passages and the intermediate flow channel extend between the opposed end portions of the double tube conduits, and wherein adjacent double tube conduits are arranged in spaced apart, parallel, facing relationship to one another to permit air to flow transversely between and around the double tube conduits; (b) a first pair of manifolds including a first inlet manifold and a first outlet manifold located respectively at the opposed end portions of said double tube conduits, said first inlet and outlet manifolds being in communication with said internal flow passages of the first and second tubes making up said plurality of double tube conduits for the flow of a first fluid through the heat exchanger, wherein the first pair of manifolds is formed by outwardly disposed bosses in each said first tube and each said second tube, said bosses defining aligned, transverse flow openings therethrough and peripheral edge portions surrounding said flow openings, the peripheral edge portions being joined together so as to join together adjacent first and second tubes of each said double tube conduit, and so as to join together the tubes of adjacent double tube conduits, to form said first pair of manifolds; (c) a second pair of manifolds in communication with said intermediate flow channel for the flow of a second fluid through the heat exchanger, the second pair of manifolds including a second inlet manifold and a second outlet manifold, the first inlet manifold being located beside one of the second inlet and outlet manifolds along the longitudinal axis of the heat exchanger, and the first outlet manifold being located beside the other of the second inlet and outlet manifolds along the longitudinal axis of the heat exchanger, the first pair of manifolds, therefore, being nested within the second pair of manifolds, wherein the second pair of manifolds is formed by inwardly disposed bosses in each tube, the inwardly disposed bosses being located inside said raised peripheral edge portion, said bosses defining aligned transverse flow openings therethrough; and (d) cooling fins located between the double tube conduits, wherein the cooling fins extend longitudinally between the bosses and are in contact with the planar walls of the first and second tubes.