PLATE HEAT EXCHANGER AND REFRIGERATION CYCLE DEVICE PROVIDED WITH PLATE HEAT EXCHANGER

摘要

A plate heat exchanger (100) in which first channels (11) channeling a first fluid and second channels (12) channeling a second fluid are alternately formed between a plurality of heat transfer plates (7), inner fins (6) being provided to at least the first channels (11). In addition, the plate heat exchanger (100) has concave grooves (8, 9) having a dimension smaller than that between the fin parts of the inner fins (6), the concave grooves (8, 9) being formed, along the direction of flow of the first fluid, on the area of the inner fins (6) facing the heat transfer plates (7) and on the heat transfer plates (7).