| 摘要 |
PROBLEM TO BE SOLVED: To provide a double tube type heat exchanger capable of further increasing a heat transferring area between a first refrigerant flow channel and a second refrigerant flow channel.SOLUTION: A double tube type heat exchanger includes an outer tube 2, and an inner tube 3 disposed in the outer tube 2 at an interval, a clearance between the outer tube 2 and the inner tube 3 serves as a first refrigerant flow channel 4, and the inside of the inner tube 3 serves as a second refrigerant flow channel 5. A plurality of cut and raised radiation fins 15 are formed on a part facing the inside of the first refrigerant flow channel 4 of an outer peripheral face of the inner tube 3. An annular fin array 16 is configured by the plurality of radiation fins 15 formed at intervals in the circumferential direction of the inner tube 3 on the same circumference, and the plurality of annular fin arrays 16 are disposed at intervals in the longitudinal direction of the inner tube 3. The radiation fins 15 of two annular fin arrays 16 adjacent to each other are not aligned in the circumferential direction of the inner tube 3. |
