Patent ID: 8453720

Claim:
A heat exchanger, comprising: a heat exchange device in which a plurality of tubes and a plurality of fin structures are alternately stacked, wherein air to be cooled and condensed enters the plurality of tubes at a front end of the heat exchange device and exits the plurality of tubes through a rear end of the heat exchange device, and wherein air used to cool the air in the plurality of tubes passes through the plurality of fin structures and enters and exits at lateral sides of the heat exchange device; a rear cover that covers the rear end of the heat exchange device; and a plurality of longitudinal water-discharging grooves formed side-by-side, wherein the plurality of longitudinal water-discharging grooves extends in a lengthwise direction of a lower end portion or a bottom lip of the rear cover, wherein each of the plurality of longitudinal water-discharging grooves is formed on the lower portion or the bottom lip of the rear cover, extends in a direction that is substantially parallel to a direction of air flow exiting the plurality of tubes, is formed in a shape of a longitudinally outward extended groove, and functions as a flow passage of condensed water to be drained, and wherein each of the plurality of longitudinal water-discharging grooves comprises a slot at a rear end portion thereof that prevents a flow resistance to the discharged condensed water by dew formed at the rear end portion of the respective longitudinal water-discharging groove.