Heat exchanger for a laundry dryer

摘要

A heat exchanger (30) for a dryer includes a plurality of tube units (32) configured to conduct warm humid air and a plurality of fin units (34) configured to conduct a flow of ambient air. The tube units (32) and fin units (34) are alternately stacked to form a core. The fin units (34) includes a plurality of air channels formed by repeatedly bending a flat metal plate in a zigzag fashion and a plurality of fins (34) formed on surfaces of the air channels. The tube units (32) have a duct form with both ends opened. The tube units (32) may be formed by extrusion. A plurality of channel walls (72) can be formed inside the tube units (32). A plurality of grooves (151) or fins (152) can also be formed inside the tube units (32). A plurality of channel walls (161) can also be vertically formed inside the tube units (32). In this case, the grooves (151) or fins (152) can be formed on the channel walls (161). The grooves (151) or fins (152) can also be formed in a spiral form on the inner surfaces of the tube units (32).