| 摘要 |
A heat exchanger includes at least one tube provided with an inner fin in a fluid passage which is defined by the tube therein and has a substantially ellipse-shaped cross section. A plate member for constructing the tube has two edge portions, which overlap each other and are integrally joined at a single joint disposed at a major-axis direction end of the tube. The inner fin is arranged in the tube before the forming of the joint, thus improving an arrangement performance of the inner fin. Moreover, there exists the single joint positioned at the one end of the tube so that a joint reliability of the tube is enhanced.
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