| 摘要 |
PURPOSE: To enhance efficiency of absorbing heat from a water pipe by providing in a fin a vertically long slit elongated almost continuously with the bottom line of a through hole. CONSTITUTION: Drain on a water pipe 11 is gathered on the bottom line of each straight portion 11a and is farther gathered on the boundary between the bottom line and a fin 12 on account of surface tension. Because each fin 12 is provided with a slit 5 continuously with the bottom line of a through hole 12a, drain on each pipe is gathered in the slit 5 to grow into drops of water, which falls downward along the inner wall of the slit 5. Because each slit 5 is downwardly opened, the drain flowing downward along the slit 5 falls off from the fin 12 and is discharged through a drain discharging outlet 8. Thus, the drain on the bottom line of the water pipe 11 is quickly discharged and interruption of heat absorption caused by the drain can be suppressed. As the result, efficiency of absorbing heat from the water pipe 11 is enhanced. |
