| 摘要 |
PURPOSE: A refrigerant tube of a heat exchanger is provided to widen a heat transfer area as much as the number of grooves is increased, not to make resistance pressure in the tube strong to the deformation of projections in expanding the tube as the height of the projection is not increased, and to smoothly contact gaseous refrigerant and the refrigerant tube by rapidly flowing condensed liquid refrigerant along the expanded groove if the width of a bottom surface of the groove is expanded and the heat exchanger is used as a condenser. CONSTITUTION: A refrigerant tube of a heat exchanger comprises a spiral groove(10a) longitudinally formed on an inner peripheral surface. If an outer diameter of the refrigerant tube is 7.0mm, the height(h) of the groove is 0.15mm adding or minus 0.02mm, the number thereof is 60¯70, the angle(beta) of a projection(101) between the grooves is 20¯35 degrees, and the width(l) of a bottom surface of the groove is 0.16¯0.19mm.
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