| 摘要 |
PROBLEM TO BE SOLVED: To provide a cascade heat exchanger capable of switching a unit cycle operation and a cascade cycle operation without newly adding an auxiliary evaporator or a fan that is not used in a normal cascade cycle system.SOLUTION: In a cascade cycle system 100 comprising a primary side refrigerant circuit 1 and a secondary side refrigerant circuit 2, a cascade heat exchanger 200 for coupling the primary side refrigerant circuit 1 and the secondary side refrigerant circuit 2 comprises: a primary side condensing part refrigerant flow passage 13a forming a primary side condensing part 13; a secondary side evaporation part refrigerant flow passage 25a forming a secondary side evaporation part 25; a secondary side condensing part refrigerant flow passage 23a forming a secondary side condensing part 23; and an object medium flow passage 33 through which an object medium that is a heat exchanging object flows. |
