Patent ID: 6220340
Filing Date: 2001-04-24
Classification: F01M,F28D,F28F,Y10S

Abstract:
A heat exchanger comprising: a plurality of stacked tubular members defining flow passages therethrough, the tubular members having raised end portions defining respective inlet and outlet openings, so that in the stacked tubular members, the respective inlet and outlet openings communicate to define inlet and outlet manifolds, said tubular members having a predetermined internal cold flow resistance; a bypass conduit attached to the stacked tubular members, the bypass conduit having opposite end portions and a tubular intermediate wall extending therebetween defining a bypass channel, the opposite end portions of the bypass conduit defining, respectively, a fluid inlet and a fluid outlet, said inlet and outlet communicating with the respective inlet and outlet manifolds for the flow of fluid through the bypass channel; said intermediate wall having a plurality of longitudinally spaced-apart, inwardly disposed, mating dimples formed therein, the mating dimples defining flow restrictions between the mating dimples and adjacent areas of said intermediate wall; the mating dimples having a predetermined height and transverse width such that the cold flow resistance past said flow restrictions is less than said predetermined internal cold flow resistance of the tubular members; and the mating dimples being spaced-apart such that the hot flow resistance past the dimples increases as the temperature of the fluid in the bypass channel increases.