| 摘要 |
PROBLEM TO BE SOLVED: To improve heat exchange efficiency in a heat exchanger in which one flow passage of a fluid for performing heat exchange is formed by a capillary tube.SOLUTION: In a heat exchanger, a flow passage of a gas refrigerant is formed by a capillary tube 10, a flow passage of water is formed by a tube body 20, and they are incorporated into a heat pump type water heater. A flat tube whose cross section is substantially rectangular shaped is used for the tube body 20, and two pieces of capillary tubes 10, 10 and the tube body 20 are brought into a vertically contacted state to have a sandwich structure where capillary tubes 10, 10 are sandwiched by the tube bodies 20 vertically. The capillary tubes 10, 10 and the tube bodies 20 are wound in a coil to form a spiral shape. A plurality of wedge shaped recesses 23 are formed along the longitudinal direction of the tube body 20 extending in a spiral shape on an outer peripheral surface and an inner peripheral surface of the tube body 20 which are not in contact with the capillary tubes 10, 10. |
