| 摘要 |
PROBLEM TO BE SOLVED: To improve the thermal conductivity on an air side by forming groove-like dented portions (fluid passages) 26, 27 for air flows on an outer wall surface of a tube 3. SOLUTION: The groove-like dented portions 26 and 27 in which air flows are placed between two projected portions 24 and 25 formed adjacent to each other on a pair of mold plates 5 and 6 forming a tube 3 for heat exchanging a refrigerant flowing in a refrigerant passage 23 and air passing through the outside. With this configuration, a heat conducting surface on the air side is enlarged by the air flow of the arrow C which has not been seen in a conventional laminated type heat exchanger, and the heat conductivity on the air side is improved considerably by an effect of promoting the heat conduction caused by a contraction flow of inlet side openings 26a and 27a. Also, the groove-like dented portions 26 and 27 as gaps formed between the two projected portions 24 and 25 placed adjacent to each other are so formed to be tortuous, which making the air disrupted and improving the thermal conductivity on the air side. COPYRIGHT: (C)2004,JPO
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