| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger where the pressure resistance of the tube is improved. SOLUTION: In a heat exchanger, which performs the heat exchange of a medium by the heat conducted to a tube, equipped with a flat tube provided with a plurality of passages for circulating media, the tube 2 is made by rolling a plate and also in the cross section of the tube, the passage 21a positioned at the end in width direction is made smaller in sectional area than other passages 21b. Furthermore, the plate is provided with a plurality of crooked projections 22 and 22, and the plural projections are made by sizing the plural curves after forming these in the key parts of the plate, and also other curves directed in reverse to them are made between the curves, and at sizing, the curves are returned gradually to flat curves.
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