Drainage structure of corrugated fin-type heat exchanger

摘要

Even if a heat exchange tube is horizontally disposed, condensed water (dew condensation water) attached to the surface of the heat exchange tube can be satisfactorily drained, and the adverse effect on an airflow resistance and a heat-exchange efficiency can be suppressed. Provided is a corrugated fin-type heat exchanger (1) wherein a plurality of flat heat exchange tubes (3) parallel with one another are horizontally disposed between a pair of opposed header pipes (2a, 2b); corrugated fins (4) are provided between and bonded to the heat exchange tubes (3). A plurality of water passages (10) are formed on the outer surfaces of the end portions of the heat exchange tubes (3) in the width direction thereof, and are spaced at an appropriate pitch in the longitudinal direction of each heat exchange tube (3). The water passages (10) induce the water accumulated between the respective heat exchange tubes (3) and the corrugated fins (4) adjacent to the respective heat exchange tubes (3) in the upward and downward directions of the respective heat exchange tubes (3).