| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger with very high heat exchange efficiency, and superior energy saving performance. SOLUTION: A windward heat exchanger 11 and a leeward heat exchanger 12 are provided, having heat transfer tubes 13 inserted in tabular fins 10, 10, and provided in a plurality of rows in a perpendicular direction to a flow direction of gas. In the heat exchanger, a width size L of the tabular fin of the windward heat exchanger 11 is formed larger than a width size L2 of the tabular fin of the leeward heat exchanger 12, and a tube outer diameter D of the heat transfer tube 13 is set 7-8.5 mm. Since heat flow velocities shared by the heat transfer tubes of each row will be equalized, particularly, frost formation in a first row becomes small when a temperature of the gas is low, and efficiency of the heat exchanger can be improved. COPYRIGHT: (C)2009,JPO&INPIT
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