| 摘要 |
PROBLEM TO BE SOLVED: To provide a flat tube capable of increasing a heat transfer area by increasing an inner peripheral length of the whole fluid passage in a cross-section of the flat tube, and being easily manufactured. SOLUTION: A refrigerant circulation tube (flat tube) 4 has a pair of flat walls 13 opposed to each other and two side walls 14, and a plurality of fluid passages 16, 16A extending in the tube longitudinal direction are arranged in the tube width direction through partitioning walls 15. Each of inner faces of a part facing each fluid passage 16 excluding the fluid passages 16A at both ends in the pipe width direction of both flat walls 13 has one projection 17 extending in the longitudinal direction of the fluid passage 16, and each of both side faces of the partitioning walls 15 has one projection 18 extending in the longitudinal direction of the fluid passage 16. Heights of the projections 18 formed on the partitioning walls 15 are lower than heights of the projections 17 formed on the part facing the fluid passage 16 excluding the fluid passages 16A at both ends in the pipe width direction of both the flat walls. COPYRIGHT: (C)2011,JPO&INPIT
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