Patent ID: 6827139
Filing Date: 2004-12-07
Classification: F28D,F28F

Abstract:
A heat exchanger for exchanging heat between internal fluid inside the heat exchanger and external fluid outside the heat exchanger, the heat exchanger comprising:a plurality of aligned tubes which are arranged one after another in an aligning direction; and at least one header tank unit, each of which includes: a plurality of fluid conduits which extend parallel to the aligning direction of the plurality of tubes and which are in communication with the plurality of tubes; and a communication hole defining means for defining a plurality of communication holes therethrough, wherein: each communication hole communicates between a corresponding one of the plurality of tubes and a corresponding one of the plurality of fluid conduits of the header tank unit such that each tube is spaced apart from the corresponding one of the plurality of fluid conduits; one of the plurality of fluid conduits of the header tank unit is directly in communication with one of predetermined adjacent two of the plurality of tubes through a corresponding one of the plurality of communication holes and is not in communication with the other one of the predetermined adjacent two of the plurality of tubes due to the communication hole defining means; and the predetermined adjacent two of the plurality of tube are adjacent to one another and are located within a longitudinal extent of the one of the plurality of fluid conduits of the header tank.