Abstract: A heat exchanger includes: an inlet header tube including opposite first and second ends and an inner space formed between the first and second ends; an outlet header tube parallel to the inlet header tube; a plurality of heat exchange tubes transversely extending between and fluidly connected to the inlet and outlet header tubes, each of the heat exchange tubes having a connecting end connected to the inlet header tube; and a baffle tube inserted into the inner space of the inlet header tube. The baffle tube has an open end proximate to the first end, a closed end proximate to the second end, and a plurality of orifices disposed between the open and closed ends to fluidly intercommunicate the inner space of the inlet header tube and the baffle tube. Each of the orifices is disposed in alignment with the connecting end of one of the heat exchange tubes.