| 摘要 |
A heat exchanger, such as a condenser, for use in a automobile air conditioning system includes a plurality of flat tubes for conducting the refrigerant and a plurality of corrugated outer fins fixedly sandwiched between the flat tubes. First and second header pipes are fixedly and hermetically connected to the flat tubes and, thereby, communicate with the interior of the tubes. A plurality of diagonally arranged projected stripes are formed on inner surfaces of the flat tubes. First portions of the projected stripes project from a lower inner surface of the flat tubes, and second portions of the projected stripes project from an upper inner surface of the flat tubes. The first and second portions of the projected stripes are in contact with one another at the points of intersection therebetween. Thereby, refrigerant flows through the flat tubes in a turbulent flow condition, so that the heat exchanging performance of the condenser increases while maintaining the internal pressure resistance strength of the tubes.
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