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HEAT TRANSFER PIPE WITH GROOVED INNER SURFACE AND HEAT EXCHANGER USING THE HEAT TRANSFER TUBE WITH GROOVED INNER SURFACE
HEAT TRANSFER PIPE WITH GROOVED INNER SURFACE AND HEAT EXCHANGER USING THE HEAT TRANSFER TUBE WITH GROOVED INNER SURFACE
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机译：带凹槽内表面的传热管和带有凹槽内表面的传热管的换热器
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摘要
PROBLEM TO BE SOLVED: To provide a heat transfer tube with grooved inner surface, in which an inner surface fin does not fall down during expanding the tube, and which is suitable for a heat exchanger using carbon dioxide as a refrigerant.;SOLUTION: A heat transfer tube with grooved inner surface for use in an heat exchanger, comprising fins formed on the tube inner surface, wherein a first fin has a height of 0.10 mm to 0.22 mm, an apex angle of 20° to 60° and a ratio of the curvature radius to height of the top part of 5 or more, or a ratio of the width of a plane part to fin height of the top part of 0.3 to 1.0; a second fin has an apex angle of 20° to 60° and a height ratio of the first to second fins of 0.5 to 0.9; the thickness "t" of the pipe is 0.4 mm or more, and the ratio t/D of the thickness "t" to an outer diameter "D" ranges from 0.04 to 0.25.;COPYRIGHT: (C)2005,JPO&NCIPI
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