Heat exchanger with dual heat-exchanging portions

A heat exchanger comprising:

• a plurality of first tubes through which a first fluid flows;
• a plurality of second tubes which are arranged in parallel with the first tubes and through which a second fluid flows;
• header tanks which are provided on both longitudinal ends of the tubes, extend in a perpendicular direction to the extending direction of the tubes, and communicate with the tubes;
• first and second separators which separate a space in the header tank into a first space communicating with the first tubes and a second space communicating with the second tubes and, at the same time, separate the first and second spaces from each other at a desired distance;
• wherein
• each of the first separator and the second separator has a soldered surface formed by folding the outer circumferential portion of a plate member coated with solders and coupled to the wall surface of the header tank by soldering;
• wherein
• an aperture into which the two separators are inserted is provided on the header tank;
• and wherein
• the dimension (h) of the portion of the aperture in parallel with the longitudinal side of the header tank is larger than the sum of the dimension (t1) of the portion of the soldered surface of the first separator in parallel with the longitudinal side of the header tank and the dimension (t2) of the portion of the soldered surface of the second separator in parallel with the longitudinal side of the header tank.