Patent ID: 8701750

Claim:
A heat exchanger, comprising: a pair of header-tanks which are arranged in parallel to be spaced apart from each other, and each of which defines an inner space as a first refrigerant passage when both longitudinal ends are closed and comprises at least one partition wall that partitions the first refrigerant passage along a width direction and at least one baffle that partitions the first refrigerant passage along a longitudinal direction; a plurality of tubes of which both ends are fixedly inserted into the pair of header-tanks to form a second refrigerant passage; and a plurality of fins which are interposed between the tubes, wherein said at least one partition wall includes one or more communication holes, said one or more communication holes are formed on the partition wall that is positioned at a region disposed between the baffle and one end of the header-tank adjacent to the baffle, assuming that a distance from the baffle to the one end of the header-tank is 100%, said one or more communication holes are formed at positions on the partition wall which corresponds to an extent of 0˜50%, and a ratio of a surface area of said one or more communication holes per a cross-sectional area of the header-tank is in an extent of 70˜160%.