| 摘要 |
PROBLEM TO BE SOLVED: To reduce the time required for defrosting in a heat exchanger including a flat tube and a header collecting tube.SOLUTION: A heat exchanger (23) includes a plurality of main heat exchange parts (51a-51c) and a plurality of auxiliary heat exchange parts (52a-52c). A first header collecting tube (60) includes an upper space (61) that communicates with flat tubes (33) of all of the main heat exchange parts (51a-51c). Each of the auxiliary heat exchange parts (52a-52c) is connected in series with the main heat exchange part (51a-51c) corresponding thereto. Among the number ratios between the flat tubes (33) of the main heat exchange parts (51a-51c) and the auxiliary heat exchange parts (52a-52c) which correspond to each other, the number ratio regarding the first main heat exchange part (51a) located undermost is minimum. The first main heat exchange part (51a) and the third auxiliary heat exchange part (52c) constitute a discharge acceleration means (100) which accelerates the discharge of liquid refrigerant from a lower part of the first main heat exchange part (51a) during a defrosting operation. |
