| 摘要 |
PROBLEM TO BE SOLVED: To provide a micro-tube heat exchanger capable of realizing the optimum and high heat exchanging performance and achieving the sufficient heat exchange even when two or more parallel flow type or serpentine type micro-tube heat exchangers are used as evaporators or condensers. SOLUTION: An internal area of a refrigerant passage hole 9a per one piece of flat tube of the heat exchanger A1 of a first row on a upstream side is determined to be larger than that of the heat exchanger B1 of a second row on a downstream side, whereby the heat transferring quantity by a heat medium for transferring the heat to an air side through fins 2 closely kept into contact with the flat tubes 1, and the heat exchanging quantity can be increased in the heat exchanger A1 of the first row, and the heat exchangers of the first and second rows can be effectively utilized while keeping proper balance and the performance can be maximized, even when the heat exchangers of two or more rows are used as the evaporators or the condensers. COPYRIGHT: (C)2005,JPO&NCIPI
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