Patent ID: 6408939
Filing Date: 2002-06-25
Classification: F28D,F28F

Abstract:
The heat exchanger comprising:a first heat-exchanging unit for performing heat exchange between a first fluid and air, said first heat exchanging unit includes a plurality of first tubes through which said first fluid flows, a plurality of first corrugated fins disposed between adjacent first tubes, and a first tank portion disposed to communicate with said first tubes, at both longitudinal ends of each aid first tube; a second heat-exchanging unit for performing heat exchange between a second fluid and air, said second heating-exchanging unit includes a plurality of second tubes through which said second fluid flows, said second tubes extending in parallel with said first tubes, a plurality of second corrugated fins disposed between adjacent said second tubes, and a second tank portion disposed to communicate with said second tubes, at both longitudinal ends of each said second tube; a side plate disposed in parallel with said first and second tubes, for reinforcing said first and second heat-exchanging units, wherein: said first and second heat-exchanging units are disposed to be integrated through said side plate; said second tubes have a tube dimension in a tube longitudinal direction of said second tubes, smaller than that of said first tubes, in such a manner that the first heat-exchanging unit has an overlapping portion overlapping with said second heat-exchanging unit in an air-flowing direction and a non-overlapping portion in the air-flowing direction; in the overlapping portion, air passes through both said first heat-exchanging unit and said second heat-exchanging unit; and in the non-overlapping portion, air only passes through the first heat-exchanging unit.