| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat exchanger that reduces a contact thermal resistance between a heat transfer tube and a plate fin and improves the heat transfer performance, and to provide a method for manufacturing the same, a refrigerator, and an air conditioner. <P>SOLUTION: The heat transfer tube 3 has an outer form whose cross section is substantially elliptical, and a major axis of the ellipse is arranged along an airflow direction. In the heat transfer tube, the tube has a first and second refrigerant channel 31a and 31b formed of two symmetric substantially-D-shaped through-holes, with a partition formed along a short axis direction of the ellipse therebetween. The thickness of major axis walls 3a and 3b facing the major axis of the ellipse is formed thicker than that of short axis walls 3c and 3d facing the short axis of the ellipse. The diameters of the first and second refrigerant channels 31a and 31b are expanded using a tube-expansion buret ball 100, and thereby the heat transfer tube is joined to the plate fin 2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
