| 摘要 |
A flat heat transfer tube has upper and lower walls and fluid channels. Two to five inner fins are formed on each of two surfaces of the flat walls facing each fluid channel. The tube height is 1.8 mm or less; the tube width is 20 mm or less; the fluid channel height is 1.0 mm or less; the fluid channel width w1 is 2.0 mm or less; the fluid diameter is 0.3 to 1.2 mm; and the thickness t of each wall is 0.4 mm or less. The ratio h2/t of the fin height h2 to the wall thickness t satisfies the relation 0.5<=h2/t<=2.0. The ratio p1/w1 of the fin pitch p1 to the fluid channel width w1 satisfies the relation 0.15<=p1/w1<=1/n (where n is the number of the inner fins formed on one of the two surfaces).
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