| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum internally-grooved heat transfer tube capable of exerting superior heat exchanging performance, with respect to the internally-grooved heat transfer tube having prescribed internal grooves formed on a tube internal face by extruding aluminum or its alloy. SOLUTION: In this aluminum internally-grooved heat transfer tube 10 having three or more internal grooves 12 extending in the tube axial direction, in the tube circumferential direction by extruding aluminum or its alloy, a ratio Ha/Di of a fin height Ha of the internal fin 14 formed between the internal grooves 12, 12 adjacent to each other, and a tube minimum inner diameter Di is 0.02-0.45, an uneven section 18 is formed on one 16a out of side faces 16 of the internal grooves 14, 14 adjacent to each other, and the side face 16b of the other internal fin 14 is a smooth face. COPYRIGHT: (C)2011,JPO&INPIT |
