| 摘要 |
PROBLEM TO BE SOLVED: To improve heat exchange performance while securing compactness without causing increase of pressure loss in comparison with a fin-and-tube heat exchanger in a fin-less heat exchanger for an air conditioner. SOLUTION: The fin-less heat exchanger 10 is equipped with a plurality of flat tubes 1 having flat passage cross section, and header tanks 2 connected to both ends of the flat tubes 1. In each flat tube 1, a tube with a minor outer diameter A within a range of 0.31-1.50 mm is used. The flat tubes 1 are arranged such that the major diameter direction is substantially in parallel with a flow 4 of air, and the flat tubes 1 are arranged at equal intervals in one row in a direction crossing a direction of the flow 4 of air. With the pitch of the flat tubes 1 represented by B, the flat tubes 1 are installed such that when A is 0.31 mm, B/A is 2.5-5.6, A is 0.63, B/A is 2.5-3.1, A is 1.00, B/A is 1.9-2.1, A is 1.25, B/A is 1.8-1.9, and A is 1.40, B/A is 1.74. COPYRIGHT: (C)2009,JPO&INPIT
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