| 摘要 |
PROBLEM TO BE SOLVED: To provide a double pipe heat exchanger which achieves improvement of heat exchange performance while inhibiting increase of the size and costs, and to provide a heat pump type heat source machine including the double pipe heat exchanger.SOLUTION: A double pipe heat exchanger 10 comprises: an inner pipe 35; and an outer pipe 36 and conducts heat exchange between a first heat medium flowing in the inner pipe 35 and a second heat medium flowing between the inner pipe 35 and the outer pipe 36. The double pipe heat exchanger 10 has bending parts 34, and an entire body of the double pipe heat exchanger 10 is formed into a spiral or tortuous shape. Protruding parts 41 which protrude to the outer side so that a cross sectional area of the outer tube 36 expands are formed on an inner surface of the outer pipe 36 in the bending parts 34.SELECTED DRAWING: Figure 2 |
