Patent ID: 7080682

Claim:
A heat exchanger comprising: an inlet pipe for introducing a fluid for heat exchange; a plurality of tubes connected to the inlet pipe with a predetermined interval along a longitudinal direction of the inlet pipe for passing the fluid introduced into the inlet pipe and performing heat exchange; a discharge pipe connected to the other side end portions of the tubes for discharging the fluid which completed heat exchange; and folded fins respectively mounted at one side of the tubes for expanding a contact area with air passing through a passage among the tubes, said fins having louvers protruding from a surface of said fins and spaced a distance from said surface, and plate portions between said louvers, at least a portion of said plate portions remaining at said surface; wherein both of the louvers and the plate portions are tilted in the same direction at a non-zero predetermined angle to said surface, said angle being large enough to prevent condensate water from staying at surfaces of the fins.